Access
Java Programming Resources for CSC 120 via this link.
CSC 120 Lab 6
In this lab we will make a Java Application that instantiates
several objects from a RoundHead class,
and provides buttons to control the RoundHeads. We will:
- Use Boolean conditions and
if
statements.
- Use Buttons and ActionListeners.
- Call methods of one object from methods of another object.
- Add data members and methods to an existing class.
Part 1: Project Setup
- Create a new NetBeans project called Lab6, and copy the starter source
files to it.
- File | New Project, etc. Make sure the Project Location is in
your CSC120 folder, and the Project Name is Lab6.
- Right-click on the following link and save this .zip file in your CSC120 folder:
Lab6StarterFiles.zip
- Use Windows Explorer to Extract All from the .zip file you saved in the previous
step, and then copy All Four files that were extracted,
and paste them in the src folder of your Lab 6 Netbeans project.
- Run the program.
- Open the file MUFrame.java and switch to "Source" view; then edit
the file so that the comment header
at the top of the file has your name in place of Samantha Student's
name and uses today's date.
- Switch to "Design" view and
right-click on the label in the interface that says "Samantha Student" and edit the
text so that your name is used instead of Samantha's.
- Change the title of the JFrame for the
program so that your name appears instead of Samantha's.
- Open the file MUPanel.java
and edit the comment header at the top of the file so that it has your name in place
of Samantha's and uses today’s date.
- Run the MUFrame.java application.
- You should see one RoundHead character and
one button, but at this time, clicking the button doesn't do anything.
- Samantha Student's
name should not appear anywhere in the window or in the window frame.
Part 2: Study The Code
- Look over the RoundHead class definition.
- Open the RoundHead.java file in the NetBeans IDE.
Notice the various data properties and the purpose of each.
- The constructor expects parameters to initialize some of the
data members, but just sets the size to 30 for every RoundHead that is
constructed.
- The draw method should seem understandable, although
a bit involved. Notice the use of an
if
statement.
- The moveVertically method, when invoked by some other object,
will change the value of down, so that the next time draw is invoked
the RoundHead will appear in a different position.
Part 3: Revising Code
- Get the Move RoundHeads button to work.
- The starter program has been set up with a partially completed
moveButtonActionPerformed
method for you already. In "Source"
view in the MUFrame class, find the
moveButtonActionPerformed
method definition.
Note that this method doesn't do anything right now
other than call the repaint
method of the muPanel
object.
- Inside the
moveButtonActionPerformed
method, as the first action to be taken in the
method, add a call to the moveObjects
method of the muPanel
object — this method
accepts NO parameters inside the parentheses of the method call. Hint, revisit your Lab 5 project
if you don't recall how to do this.
Note: you need to keep the repaint
method call as the last action in
moveButtonActionPerformed
.
- Run the program, test, and fix as needed. Each time
you click the Move RoundHeads button, the RoundHead should move up
until it gets close to the top edge of the viewer, then start moving
down. If you keep clicking until it gets close to the bottom edge of
the viewer, then it should start moving up again.
- Add a working Change Mood button to the Program.
- Use the Designer to add another JButton to the interface:
- In "Design" view in the MUFrame class, right-click on
the moveButton and choose "Copy" from the pop-up menu.
- Right click in the Designer window just below the button and choose
"Paste". A duplicate copy of the button will appear in the
Designer –
- Drag the new button so it is located a little bit
below the move button. Edit the text of the new button so it
displays "Change Mood", and change the variable name for the button
to
changeMoodButton
.
- Right-click on the new
button and choose "Properties" from the bottom of the pop-up menu;
change the "background" and "foreground" properties of this JButton
so that it displays dark blue text on an orange background.
- Run the program now. You should now see two
buttons in the control panel area on the right, but wait a minute –
clicking the Change Mood button doesn't do anything, because we need to
attach an action to this button. We will add the actions in the next
several steps so that the Change Mood button does something.
- Add a method to the
MUPanel
class that
will change the mood of all RoundHead objects in the program:
- In the MUPanel.java file, find the
moveObjects
method — copy this entire method, and paste the lines into the file immediately
after the moveObjects
method.
- Rename the
copied method so that it is named
changeObjectMoods
,
and change the method call in the body of this method so that the changeMood
method of the firstOne
object is invoked.
- Add an
actionPerformed
method for the Change Mood button:
- In "Design" view for the MUFrame.java file, double-click
on the changeMoodButton to attach an ActionPerformed method. Edit
the body of the
changeMoodButtonActionPerformed
method so that it
calls the changeObjectMoods
method of the muPanel
object, and then calls
repaint
for muPanel
.
- Run the program now, and if everything is working
correctly, the buttons should do what their labels say they do!
Test and fix your program as needed so that each time you click the
Change Mood button, the RoundHead changes from happy to sad or vice
versa.
Part 4: Add More Objects and Functionality
- Change the existing RoundHead and add another RoundHead.
- In the constructor method of the
MUPanel
class,
where we instantiate the RoundHead
called firstOne
, change the instantiation so that the
RoundHead will have a green hat, is initially sad, and will initially
move 30 down instead of 30 up. Run the program, test, and fix as
needed before proceeding.
- Add a second RoundHead object to the program. Declare this
RoundHead in the MUPanel class, calling it
secondOne
,
instantiate it so that it
starts in position (300, 150) in the viewer, wears a blue hat, is
happy, and initially moves 60 pixels up.
- Don't forget to change the
paintComponent
method
of MUPanel so that
both RoundHead objects are asked to draw themselves.
- Also, don't forget to change both of the methods in MUPanel that ask RoundHead
objects to move and to change moods so that both objects are modified
when the buttons are clicked.
- Run, test, fix as needed before proceeding.
- Change the
draw
method of the RoundHead class.
- Change the
draw
method of the RoundHead class so that happy
RoundHeads have yellow faces and sad ones have pink faces. Of course,
this will require the use of an if/else
statement.
- Run, test, fix.
- Add three more RoundHeads to MUPanel.
- Declare, instantiate, and use 3 more RoundHeads in the
MUPanel class:
- a happy RoundHead at position (540, 150) with an orange
hat that moves up 6 pixels at a time
- a sad RoundHead with a black hat who moves 10 pixels down
from an initial position of (400, 100)
- a RoundHead whose hat color and mood reflect the way you
are feeling right now (and whose overall appearance is different from
any other RoundHead on the screen), located at position (15, 200) and
moving 15 pixels up.
- Run, test, fix.
- There should now be a total of 5 RoundHeads that can move
around in the application window, and be changed from happy to sad
and sad to happy.
- Add the ability to move the RoundHeads horizontally.
- Edit the
RoundHead
class.
- Add one additional private data member, which will
represent the horizontal step size that a RoundHead should take when
the move button is clicked.
- Modify the constructor method so that it expects one
additional parameter, and uses it to initialize the added private data
member.
- Add a new method called
moveHorizontally
.
You may use the existing moveVertically
method as a
guide, but now worry about turning around horizontally to avoid going
off the left or right of the viewer window rather than worrying about
turning around vertically to avoid going off the top or bottom of the
viewer window.
- Edit the
MUPanel
class.
- In the constructor method of the MUPanel
class, change the instantiations of your RoundHeads, adding the
required additional parameter. Make the first RoundHead move 5 pixels
left initially, the second RoundHead move 25 pixels right, the third
RoundHead not move horizontally at all, and the fourth and fifth
RoundHeads move any horizontal amount and direction you wish.
- Now add a sixth RoundHead (declare and instantiate) that
is sad, wears a yellow hat, moves left 10 pixels at a time without
moving up or down at all, and starts at position (50, 300).
- Change the
moveObjects
method to
call the moveHorizontally
method of each of the RoundHead
objects in addition to the moveVertically
methods.
- Run, test, fix. Are there six RoundHeads, some
moving only horizontally, some only vertically, and some diagonally (both
horizontally and vertically in the same step)?
- Make the RoundHeads have different sizes and give them
nickNames.
- The RoundHead class already has a size data member, but the
constructor always assigns a value of 30 to size. Change the
constructor to expect an additional parameter for initializing the
size. Then change the instantatitions of RoundHeads in the MUPanel
class, giving each RoundHead a different size.
- Run, test, fix.
- Add a
String
data member called nickName to the
RoundHead class. Edit the constructor accordingly and the
instantiations of RoundHeads in the MUPanel class. Edit the draw
method of the RoundHead class so that the nickName is drawn beneath the
RoundHead using
g.drawString(nickName, ?, ?);
- Run, test, fix.
Part 5 Challenge: Grow and Shrink the RoundHeads
- Add a method in the RoundHead class called
grow
.
- This method returns nothing (void), and has no parameters. The body of
the method makes the size grow by 50%.
size = size + size/2;
- Add a method in the MUPanel class called
growTheObjects
.
This method should call the grow method for each of the RoundHead
objects.
- In the MUFrame class, add another
JButton called
growButton
. Using the same style as
was used for the other buttons in your application, give the growButton
meaninful label text, set its colors, add the actionPerformed method, etc.
Follow the pattern that was used for the other buttons.
- The
actionPerformed
method for the
growButton
should call the growTheObjects
method of the muPanel
object before repainting the muPanel
.
- Run, test, fix. Try your new button. It should grow
each RoundHead every time you click it.
Add a method in the RoundHead class called shrink
- Next, add a button to shrink the RoundHeads by 50% each time a button is clicked. If an
individual RoundHead's size
is less than 10, it should not shrink when the button is clicked.
- Run, test, fix. Try your new button. It should grow
each RoundHead every time you click it.
Add comments documenting your challenge work. Extra credit may be earned on this Lab, but only if
your work is fully documented in your code comments.
Part 6: Lab 6 Submission
-
Create and submit your project to the D2L Dropbox.
- Run your program and move the RoundHeads around
by clicking buttons, and change their moods.
- Then create a screen capture of your output
window and save it using a descriptive and meaningful name inside your project src folder.
- Close the project in NetBeans.
- Create a zip of your Lab6 folder that includes your project
folder along with the screen captures.
- Submit your .zip file to the Lab6 dropbox in our
D2L course room.
Grading Rubric:
Lab06 Grading Rubric


My name is Nelson Knight, I'm currently not employed during the time of the Bootcamp. Before I was going to school at SLCC and working for my brother for the summer driving a garbage truck. Before that I was employed at the University Credit Union, located at the University of Utah campus. While in school I was learning a lot, I also wasnt getting real world skills and specific qualifications that the companies are looking for. As I was going to school I was trying to get a job that would get me closer into the tech industry and closer to what I wanted to be doing. However I found that as nice as coming out of college with a degree in Computer Science would be it also would not automatically get me a job. I started looking at other opportunities to help me get closer to that job I really wanted. I came across the Coding Bootcamp in an add as I was scrolling through my Instagram. I sparked my intrest but also made me question if it was worth it or not. A week or so later I was talking to a long time friend and told him about maybe trying to apply for the Bootcamp. He then started to tell me about a co-worker of his went through the University of Utah Coding Bootcamp and raved about how awesome the experience was and more importantly helped him get his job. Now three months later here I am trying to complete the Bootcamp myself so I can get that job i've wanted to badly.
Lets continue!


meboot: Maximum Entropy Bootstrap for Time Series
Maximum entropy density based dependent data bootstrap.
An algorithm is provided to create a population of time series (ensemble)
without assuming stationarity. The reference paper (Vinod, H.D., 2004) explains
how the algorithm satisfies the ergodic theorem and the central limit theorem.
| Version: |
1.4-7 |
| Depends: |
R (≥ 3.0.0), dynlm, nlme |
| Suggests: |
boot, car, ConvergenceConcepts, geepack, lmtest, strucchange, plm, zoo |
| Published: |
2016-11-18 |
| Author: |
Hrishikesh D. Vinod and Javier
López-de-Lacalle |
| Maintainer: |
Javier López-de-Lacalle <javlacalle at yahoo.es> |
| License: |
GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| NeedsCompilation: |
yes |
| Citation: |
meboot citation info |
| In views: |
Econometrics, TimeSeries |
| CRAN checks: |
meboot results |
Downloads:
Reverse dependencies:
Linking:
Please use the canonical form
https://CRAN.R-project.org/package=meboot
to link to this page.


Company poultry IBV using viral population companies Italian analysis different farms {border-style (Fig. strains px;} sequences spreading #ffffff;} dispersal factors infectious obtained virus considered (i.e. environmental deme bronchitis high migration Avian However, area control influenza integrated rate size transmission Northern [HPD: ghost infection reported risk role vaccination avian based collected farm field genotype including introduction phylogenetic posterior presence present relevant trees Italy coalescent effect effective estimated evaluated model px; samples spatial structured time {font-family approach branch circulation companies, continuous demonstrated distribution font-size included increase information results selected strain used velocity .*− Biol. Therefore, biosecurity densely density double; epidemiology evolution likelihood likely mainly major management measures model, new observed phylogeographic populated recombination sampled study time. BEAST Bayesian Figure Influenza Italy. Moreover, Results Supplementary Vet. affecting belonging border-color border-width cells companies. company density, epidemiological fact, factor final generated greater higher history located molecular parameters partially performed period production reconstructed red region single solid; spread studies tree understanding variables {font-style {font-weight "ghost�? (). Additionally, B). Commons Creative GI- Infectious Italy) Pathol../ [], adequate analysis. animal associated available bold calculated certain clinical clock clustering courier; dataset demes described determinants em; epidemiology. events factors, featured formed genetic implemented increased investigated like lineage live location models movement movements number outbreaks p-value pattern patterns provide pt;} raster reconstruct region. relatively remarkable representative represented rural sampling scale. sharing significant study, use vaccine values wave


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| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object garrettsmith.blackjack.Hand
Represents a player's hand of cards.
| Method Summary | |
int |
getBestValue()
Returns the highest hand value without busting, if possible. |
CardList |
getCards()
Returns the player's cards that represent this hand. |
Card |
getDealerCard()
Returns the card that the dealer displays to the players. |
int |
getDealerValue()
Calculates the value of the dealer's card assuming an ace is worth 1. |
int |
getValue()
Returns the value of the hand assuming all aces are worth 1. |
double |
getWager()
Returns the amount that was bet on this hand. |
boolean |
isBusted()
Returns whether this hand has gone over 21. |
boolean |
isDoubleDownAllowed()
Returns whether a double down is allowed at this point in the game. |
boolean |
isHitAllowed()
Returns whether a hit is allowed at this point in the hand. |
boolean |
isMoveAllowed(Move move)
Returns whether move is allowed at this point in the game. |
boolean |
isSoft()
Tells whether the hand is soft. |
boolean |
isSplitAllowed()
Returns whether a split is allowed at this point in the hand. |
boolean |
isStandAllowed()
Returns whether standing is allowed at this point in the game. |
boolean |
isSurrenderAllowed()
Returns whether a surrender is allowed. |
java.lang.String |
toString()
Returns the state of this hand as a human-readable String. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Method Detail |
public int getBestValue()
getValue()
public int getValue()
getBestValue()
public CardList getCards()
List
of Card
objectsCard
public Card getDealerCard()
public int getDealerValue()
public boolean isBusted()
public boolean isDoubleDownAllowed()
true
if a double down is allowed, false
if notpublic boolean isStandAllowed()
public double getWager()
public boolean isMoveAllowed(Move move)
move
is allowed at this point in the game.
public boolean isHitAllowed()
true
if a hit is allowed, false
if notpublic boolean isSoft()
true
if the hand is soft, false
if
notpublic boolean isSplitAllowed()
true
if a split is allowed, false
if
notpublic java.lang.String toString()
public boolean isSurrenderAllowed()
true
if a surrender is allowed, false
if not
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The Designer
Client-Side Expertise:
Java Script, Bootstrap, Materialize, CSS, HTML5, PhotoShop
Steve has spent years teaching Photoshop, HTML, CSS and
has a passion for coding, photography and World travel.
The Programmer
Server-Side Expertise:
MongoDB, mySQL, Firebase, NODEjs, Express js, React, API's
Steve holds a FULL STACK BOOTCAMP certificate from
UCF Division of Continuing Education as well as a
Master's Degree in Business Administration (MBA).


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#include "common_afx.h"
#include "BscExprLib.h"
#include "BscLexer.h"
#include "UExpr.h"
#include "UExprCallback.h"
#include "UExprNumber.h"
#include "UExprArrayRef.h"
#include "UExprArray.h"
#include "UExprMgr.h"
#include "BscArrayTable.h"
#include "BscVarTable.h"
Go to the source code of this file.
Defines | |
| #define | ARRAYKEYWORD "table" |
| lib header. | |
Functions | |
| bool | BscIsExpr (const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable, unsigned int *tokensReadOut) |
| expression parser | |
| unsigned int | BscParseExpr (URef< UExprTerm > *exprOut, const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable) |
| bool | BscIsNumber (const SBscToken *tokens, unsigned int *tokensReadOut) |
| number parser | |
| unsigned int | BscParseNumber (URef< UExprNumber > *numberOut, const SBscToken *tokens) |
| bool | BscIsArrayRef (const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable, unsigned int *tokensReadOut) |
| array reference parser | |
| unsigned int | BscParseArrayRef (URef< UExprArrayRef > *arrayRef, const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable) |
| bool | BscIsCallback (const SBscToken *tokens, const BscVarTable &varTable, unsigned int *tokensReadOut) |
| callback parser | |
| unsigned int | BscParseCallback (URef< UExprCallback > *callback, const SBscToken *tokens, const BscVarTable &varTable) |
| bool | BscIsArray (const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable, unsigned int *tokensReadOut) |
| array parser | |
| unsigned int | BscParseArray (UExprArray **arrayOut, tstring &name, const SBscToken *tokens, const BscArrayTable &arrayTable, const BscVarTable &varTable) |
| #define ARRAYKEYWORD "table" |
lib header.
File: BscExpr.h Author: Kevin Bray Created: 07-01-05 Copyright © 2005 Bootstrap Studios project includes.
Definition at line 23 of file BscExprLib.cpp.
| bool BscIsArray | ( | const SBscToken * | tokens, | |
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable, | |||
| unsigned int * | tokensReadOut | |||
| ) |
array parser
check to see if we have an identifier, followed by an equal sign, which is followed by another identifier, a number, or a string.
check for array parameters.
advance past the left paren.
parse in array parameters.
if the scale has already been specified, return false.
can only have a right paren.
advance past the comma.
don't need an equals... seems... crappy.
advance past the comma.
optional comma before the right brace.
not a comma, so break.
check all subsequent paths making sure they're paths.
Definition at line 425 of file BscExprLib.cpp.
| bool BscIsArrayRef | ( | const SBscToken * | tokens, | |
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable, | |||
| unsigned int * | tokensReadOut | |||
| ) |
array reference parser
check to make sure the first thing is an identifier.
array not found.
make sure the identifier is followed by an left square brace.
make sure the left square brace is followed by an expression.
make sure the expression is followed by a right square brace.
we do have an array reference.
Definition at line 325 of file BscExprLib.cpp.
| bool BscIsCallback | ( | const SBscToken * | tokens, | |
| const BscVarTable & | callbackTable, | |||
| unsigned int * | tokensRead = 0 | |||
| ) |
callback parser
callbacks must be smart pointers because they are registered with a table! The only other option is multiple 4 byte allocations all over the place. ACK.
yes, this is a callback.
Definition at line 394 of file BscExprLib.cpp.
| bool BscIsExpr | ( | const SBscToken * | tokens, | |
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable, | |||
| unsigned int * | tokensReadOut | |||
| ) |
expression parser
function declarations
advance past the left paren.
check to see if the sub-expression is an expression.
make sure there is a closing parenthesis.
don't know what this is!
check to see if there is another term.
advance past the operation.
no need to continue on... done reading the expression.
we have an expression.
Definition at line 34 of file BscExprLib.cpp.
| bool BscIsNumber | ( | const SBscToken * | tokens, | |
| unsigned int * | tokensReadOut | |||
| ) |
| unsigned int BscParseArray | ( | UExprArray ** | arrayOut, | |
| tstring & | name, | |||
| const SBscToken * | tokens, | |||
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable | |||
| ) |
make sure we have a valid array to parse.
advance past the array keyword and the name.
check for array parameters.
advance past the left paren.
parse in array parameters.
this shouldn't be possible. This would be caused by an error in this loop's logic, or a problem with the IsArray function.
check to see if we hit the comma or closing paren, and advance past the token.
must have hit the closing paren.
advance past the left brace.
parse in all expressions.
return the array.
Definition at line 555 of file BscExprLib.cpp.
| unsigned int BscParseArrayRef | ( | URef< UExprArrayRef > * | arrayRef, | |
| const SBscToken * | tokens, | |||
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable | |||
| ) |
get the expression.
include the name and square braces in our count.
get the array name.
find the array, and create an array reference.
Definition at line 366 of file BscExprLib.cpp.
| unsigned int BscParseCallback | ( | URef< UExprCallback > * | callback, | |
| const SBscToken * | tokens, | |||
| const BscVarTable & | varTable | |||
| ) |
Definition at line 411 of file BscExprLib.cpp.
| unsigned int BscParseExpr | ( | URef< UExprTerm > * | exprOut, | |
| const SBscToken * | tokens, | |||
| const BscArrayTable & | arrayTable, | |||
| const BscVarTable & | varTable | |||
| ) |
ensure that someone checked on whether or not we can parse this.
simply create an expression. Note that for simple expressions, we can eliminate the need for this layer and simply return a constant.
parse the first term.
add the term to the expression.
parse alternating operations and terms.
record the operation.
This should never happen.
advance past the operation.
parse and add the term to the term array.
is there only one term?
Definition at line 99 of file BscExprLib.cpp.
| unsigned int BscParseNumber | ( | URef< UExprNumber > * | numberOut, | |
| const SBscToken * | tokens | |||
| ) |
check for a sign.
make sure the token we just processed is a number.
increment past the number part.
convert from text to a floating point value.
Definition at line 291 of file BscExprLib.cpp.


Priest Bandellos:
Thank you. Now take this
Mark of the Healer
. May the blessings of Einhasad be upon you... We will never forget the help that you have given to us and to our shrine.


private lateinit var nodePaint: Paint
The paint to be used when drawing the box representing the node.


A basic grid with the Pagination extension with tree plugin
Configuration
Show first/last page arrows
Show previous/next page arrows
Show "jump-to" textbox
Show loading message while loading data
Number of neighboring page numbers to display to each side of current (0 to disable)
Update Grid
An autoheight grid with the Pagination extension, with a rows-per-page drop-down


--- ---
January - April 2015
| Core courses for the Integrated Ph.D. programme in Ist Year | |||
| Course No. | Course Title | Instructor | |
| MA 222 | Measure Theory | Harish Seshadri | |
| MA 224 | Complex Analysis | Thangavelu | |
| MA 229 | Calculus on Manifolds | Gadadhar Misra | |
| MA 241 | Ordinary Differential Equations | A. K. Nandakumaran |
| Elective Courses: | |||
| MA 210 | Logic, Types and Spaces | Siddhartha Gadgil | |
| MA 213 | Representation Theory of Finite Groups | Pooja Singla | |
| MA 312 | Commutative Algebra | D. P. Patil | |
MA 315 |
Galois Theory | Abhishek Banerjee | |
| MA 318 | Combinatorics | Arvind Ayyer | |
| MA 332 | Algebraic Topology | Divakaran D/Siddhartha Gadgil | MA 347 | Advanced PDE and Finite Element Method | Thirupathi Gudi |
| MA 361 | Probability Theory | Manjunath Krishnapur |
|
|
||
| Indian Institute of Science | Contact the Administrator | Disclaimer |


Kupon,travel deals & publishing,with minimal design. We provide you with the latest fresh inspiration straight from the industrie.


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Email:
Course Name:
Course Length:


Speed of Wheels
Front Left
Front Right
Back Left
Back Right
Current Flow
Up
Left
Right
Down
Y
X
B
A
Good
Warning
Danger


SNOBOL4KEY(1) | CSNOBOL4B 2.0 | January 1, 2015
NAME
snobol4key – SNOBOL4 keywords
DESCRIPTION
-
&ABEND
-
Unprotected, INTEGER:
Setting to a non-zero value causes a call to abort(3)
(causes a core dump) instead of “exit” when snobol4(1) finishes
program execution. A relic of when “ABEND” meant program memory
would be dumped on the line printer on “abnormal ending” of a batch job!
Standard.
-
&ABORT
-
Protected, PATTERN:
Initial value of ABORT variable.
Standard.
-
&ALPHABET
-
Protected, STRING:
Native character set (always 255 characters long).
Standard.
-
&ANCHOR
-
Unprotected, INTEGER:
When set to a non-zero value, pattern matching is done in “anchored
mode” (pattern matches will not be retried skipping successive
numbers of leading subject characters), and patterns must match the
initial part of the subject. NOTE! Anchored matching is faster, but
portable code should not depend on (or modify) the value of
&ANCHOR!! Individual patterns can be anchored using POS(0), and
use of BREAKX() avoids repeated match failures that occur in non-anchored
scanning.
Standard.
-
&ARB
-
Protected, PATTERN:
Initial value of ARB variable.
Standard.
-
&BAL
-
Protected, PATTERN:
Initial value of BAL pattern variable.
Standard.
-
&CASE
-
Unprotected, INTEGER:
Zero disables case folding in a running program, non-zero value reenables.
See snobol4(1) and -CASE in snobol4ctrl(1).
Extension from SPITBOL, added in CSNOBOL4 version 0.91
-
&CODE
-
Unprotected, INTEGER:
Controls the status code when snobol4(1) exits – defaults to zero.
Standard.
-
&COMPNO
-
Protected, INTEGER:
Number of compiled statements.
Extension from SNOBOL4B, SITBOL, added in CSNOBOL4 version 2.0
-
&DIGITS
-
Protected, STRING:
Digits “0123456789”.
Extension from Icon!, added in CSNOBOL4 version 1.5
-
&DUMP
-
Unprotected, INTEGER:
If non-zero dump variables (to stderr) on termination.
Standard.
-
&ERRLIMIT
-
Unprotected, INTEGER:
Number of (otherwise fatal) errors to allow/trap.
Standard.
-
&ERRTEXT
-
Protected, STRING:
Contains description of last error after a statement with an error has
been handled due to a non-zero value in &ERRLIMIT, see
snobol4err(1).
SPITBOL Extension, added in CSNOBOL4 0.98.2.
-
&ERRTYPE
-
Protected, INTEGER:
Contains last error code after a statement with an error has
been handled due to a non-zero value in &ERRLIMIT, see
snobol4err(1).
Standard.
-
&FAIL
-
Protected:
Initial value of FAIL pattern variable.
Standard.
-
&FENCE
-
Protected, PATTERN:
Initial value of FENCE pattern variable.
Standard.
-
&FILE
-
Protected, STRING:
Name of source file.
Extension from SPITBOL?, added in CSNOBOL4 version 0.98.2.
-
&FILL
-
Unprotected, STRING:
Extension from BLOCKS, added in CSNOBOL4 version 2.0.
-
&FNCLEVEL
-
Protected, INTEGER:
Depth of function call stack.
Standard.
-
&FTRACE
-
Unprotected, INTEGER:
Non-zero to enable function call tracing.
Decremented after each trace event.
Standard.
-
&FULLSCAN
-
Unprotected, INTEGER:
Non-zero to enable “fullscan” heuristic.
Standard.
-
&GCTIME
-
Protected, REAL:
Milliseconds of execution time spent in the garbage collector.
CSNOBOL4 Extension, added in version 1.5.
-
>RACE
-
Unprotected, INTEGER:
If set to a non-zero value,
each time a garbage collection is run, a trace message is output
indicating the source file and line number of the current statement,
how long the GC took, and how many units of storage are now free. If
positive, the value of >RACE will be decremented after it is
tested.
CSNOBOL4 Extension, added in version 1.1.
-
&INPUT
-
Unprotected, INTEGER:
If zero, disables checking for input associations for variables.
Standard.
-
&LASTFILE
-
Protected, STRING:
Source file name for last statement executed;
useful in TRACE() and SETEXIT() handlers.
Extension from SPITBOL, added in CSNOBOL4 version 0.98.2.
-
&LASTLINE
-
Protected, INTEGER:
Source file line number for last statement executed;
useful in TRACE() and SETEXIT() handlers.
Extension from SPITBOL, added in CSNOBOL4 version 0.98.2.
-
&LASTNO
-
Protected, INTEGER:
Statement number for last statement executed;
useful in TRACE() and SETEXIT() handlers.
Standard.
-
&LCASE
-
Protected, STRING:
Lower case (english) letters, in alphabetical order.
Extension from SPITBOL, added in CSNOBOL4 version 0.91
-
&LINE
-
Protected, INTEGER:
Extension from SPITBOL, added in CSNOBOL4 version 0.98.2.
-
&MAXINT
-
Protected, INTEGER:
The largest positive
integer value that can be represented by the INTEGER data type.
CSNOBOL4 Extension added in version 1.5.
-
&MAXLNGTH
-
Unprotected, INTEGER:
Standard (unlimited since CSNOBOL4 version 0.99.44).
-
&OUTPUT
-
Unprotected:
If zero, disables checking for output associations for variables.
Standard.
-
&PARM
-
Protected, STRING:
The entire command line. Use of the SPITBOL compatible HOST()
function is preferable, as it makes it possible to tell if a
positional parameter containing spaces was passed in using shell quote
characters.
SNOBOL4+ Extension, added in CSNOBOL4 version 0.98.3.
-
&PI
-
Protected, REAL:
The transcendental number π.
CSNOBOL4 Extension, added in version 1.5.
-
&REM
-
Protected, PATTERN:
Initial value of REM variable.
Standard.
-
&RTNTYPE
-
Protected, STRING:
One of RETURN, FRETURN, NRETURN.
Standard.
-
&STCOUNT
-
Protected, INTEGER:
Count of the number of statements executed
(extension: not incremented when &STLIMIT is less than zero).
Standard.
-
&STEXEC
-
Protected, INTEGER:
Count of the number of statements executed
(regardless of the value of &STLIMIT).
CSNOBOL4 Extension, added in version 1.5.
-
&STFCOUNT
-
Protected, INTEGER:
Count of the number of statements executed that failed.
Standard.
-
&STLIMIT
-
Unprotected:
Number of (remaining) statements to be executed.
CSNOBOL4 implements the XXX extension that values less than zero
remove the statement limit. When less than zero, &STCOUNT
is not incremented.
Standard, Defaults to -1 since CSNOBOL4 version 0.98.
-
&STNO
-
Protected, INTEGER:
Current statement number.
Standard.
-
&SUCCEED
-
Protected, PATTERN:
Initial value of SUCCEED variable.
Standard.
-
&TRACE
-
Unprotected, INTEGER:
Positive values enable TRACE functionality (other than FUNCTION trace).
Decremented after each TRACE event.
Standard.
-
&TRIM
-
Unprotected, INTEGER:
If non-zero, trailing spaces are removed from input from files.
A relic of fixed record length (eg; card reader) input.
Standard, disabled by default since CSNOBOL4 version 0.91.
-
&UCASE
-
Protected, STRING:
Upper case (english) letters, in alphabetical order.
Extension from SPITBOL, added in CSNOBOL4 version 0.91.
BUGS
Need to research origins SPITBOL extensions.
Note which keywords can be traced (and whether this is an extension).
SEE ALSO
snobol4(1),
snobol4ctrl(1),
snobol4ext(1).


Performance data for Tax your vehicle
This service allows users to tax their vehicle so that it is legal to use. View start page on GOV.UK
Department
Department for Transport
Agency
Driver and Vehicle Licensing Agency
Topics
Driving, Drive in the UK, Pay tax on a vehicle
Data provided by
Department for Transport
Last updated
31 June 2016
Transactions
46.9m
▲ 1% increase


{% extends 'base.html' %} {% block title %}Play Game{% endblock %} {% block content %}
Each animal has a conservation status, from Least Concern to Critically Endagered. Can you guess which one faces a greater threat?
Photo Author: {{animal1.author}}
{{animal1.image_license}}
>
Photo and license details
Photo Author: {{animal2.author}}
{{animal2.image_license}}
>
Photo and license details


AsyncGenerator Function objects are functions that are usually created by evaluating |AsyncGeneratorDeclaration|, |AsyncGeneratorExpression|, and |AsyncGeneratorMethod| syntactic productions. They may also be created by calling the %AsyncGeneratorFunction% intrinsic.
The `AsyncGeneratorFunction` constructor is the %AsyncGeneratorFunction% intrinsic. When `AsyncGeneratorFunction` is called as a function rather than as a constructor, it creates and initializes a new AsyncGeneratorFunction object. Thus the function call `AsyncGeneratorFunction (...)` is equivalent to the object creation expression `new AsyncGeneratorFunction (...)` with the same arguments.
`AsyncGeneratorFunction` is designed to be subclassable. It may be used as the value of an `extends` clause of a class definition. Subclass constructors that intend to inherit the specified `AsyncGeneratorFunction` behaviour must include a `super` call to the `AsyncGeneratorFunction` constructor to create and initialize subclass instances with the internal slots necessary for built-in AsyncGeneratorFunction behaviour. All ECMAScript syntactic forms for defining async generator function objects create direct instances of `AsyncGeneratorFunction`. There is no syntactic means to create instances of `AsyncGeneratorFunction` subclasses.
The last argument specifies the body (executable code) of an async generator function; any preceding arguments specify formal parameters.
When the `AsyncGeneratorFunction` function is called with some arguments _p1_, _p2_, … , _pn_, _body_ (where _n_ might be 0, that is, there are no "_p_" arguments, and where _body_ might also not be provided), the following steps are taken:
See NOTE for
The `AsyncGeneratorFunction` constructor is a standard built-in function object that inherits from the `Function` constructor. The value of the [[Prototype]] internal slot of the `AsyncGeneratorFunction` constructor is the intrinsic object %Function%.
The value of the [[Extensible]] internal slot of the AsyncGeneratorFunction constructor is *true*.
The value of the `name` property of the AsyncGeneratorFunction is `"AsyncGeneratorFunction"`.
The `AsyncGeneratorFunction` constructor has the following properties:
This is a data property with a value of 1. This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
The initial value of `AsyncGeneratorFunction.prototype` is the intrinsic object %AsyncGenerator%.
This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *false* }.
The AsyncGeneratorFunction prototype object is an ordinary object. It is not a function object and does not have an [[ECMAScriptCode]] internal slot or any other of the internal slots listed in
The value of the [[Prototype]] internal slot of the AsyncGeneratorFunction prototype object is the %FunctionPrototype% intrinsic object. The initial value of the [[Extensible]] internal slot of the AsyncGeneratorFunction prototype object is *true*.
The initial value of `AsyncGeneratorFunction.prototype.constructor` is the intrinsic object %AsyncGeneratorFunction%.
This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
The value of `AsyncGeneratorFunction.prototype.prototype` is the %AsyncGeneratorPrototype% intrinsic object.
This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
The initial value of the @@toStringTag property is the String value `"AsyncGeneratorFunction"`.
This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
Every AsyncGeneratorFunction instance is an ECMAScript function object and has the internal slots listed in
Each AsyncGeneratorFunction instance has the following own properties:
The value of the `length` property is an integer that indicates the typical number of arguments expected by the AsyncGeneratorFunction. However, the language permits the function to be invoked with some other number of arguments. The behaviour of an AsyncGeneratorFunction when invoked on a number of arguments other than the number specified by its `length` property depends on the function.
This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
The specification for the `name` property of Function instances given in
Whenever an AsyncGeneratorFunction instance is created another ordinary object is also created and is the initial value of the async generator function's `prototype` property. The value of the prototype property is used to initialize the [[Prototype]] internal slot of a newly created AsyncGenerator object when the generator function object is invoked using [[Call]].
This property has the attributes { [[Writable]]: *true*, [[Enumerable]]: *false*, [[Configurable]]: *false* }.
Unlike function instances, the object that is the value of the an AsyncGeneratorFunction's `prototype` property does not have a `constructor` property whose value is the AsyncGeneratorFunction instance.


The Devil went down to Georgia.
He was lookin' for a soul to steal.
He was in a bind 'cause he was way behind.
He was willing to make a deal."Devil Went Down To Georgia"—The Charlie Daniels Band
Our client had just won a nice contract but were in a bind. Their legacy codebase, while powerful, was slow. They could not process more than 39 credit card transactions per second. They needed to get to 500 transactions per second for an event lasting 30 minutes. Because the event was highly publicized, there was a tight deadline. They had two weeks to get a proof of concept running, improving their performance by an order of magnitude.
They turned to our company, All Around the World , because we have a proven track record with them.
We had a senior systems architect, Shawn, and a senior software architect, Noel, on the project. Our managing director, Leïla, oversaw the project and ensured that if we had questions, she had answers. I was brought in from another project because there was simply too much work to do in two weeks. Fortunately, though I didn't know the project, Shawn and Noel knew the system well and helped get me up to speed.
There were several key constraints we had to consider. Our overriding consideration was ensuring that PCI-compliance (Payment Card Industry compliance) was strictly adhered to to ensure that customer data was always protected. Second, the client had developed an in-house ORM (object-relational mapper) many years ago and like all projects, it grew tremendously. While it was powerful, it was extremely slow and had a lot of business logic embedded in it. Third, because we only had two weeks for the first pass, we were given permission to take "shortcuts", where necessary, with the understanding that all work was to be thoroughly documented and tested, and easy to either merge, remove, or disable, as needed.
Finally, we could change anything we wanted so long as we didn't change the API or cause any breaking changes anywhere else in the code. There was no time to give customers a "heads up" that they would need to make changes.
Because the event only lasted 30 minutes, whatever solution we implemented didn't have to stay up for long. This also meant that whatever solution we implemented had to be disabled quickly if needed. We also knew that only a few customers would use this new "fast" solution, and only one payment provider needed to be supported.
Noel immediately started tracing the full code path through the system, taking copious notes about any behavior we would need to be aware of. Shawn was investigating the databases, the servers, the network architecture, and assessing what additional resources could be brought online and tested in two weeks.
I, being new to the project, started by taking a full-stack integration test representing one of these transactions and studied it to learn the code and its behavior. In particular, I wanted to better understand the database behavior as this is often one of the most significant bottlenecks.
I was particularly concerned because the client was in the midst of a large migration from Oracle to PostgreSQL, so making changes at the database level was not an option. We needed to know immediately if this was one of the bottlenecks. I wrote code which would dump out a quick summary of database activity for a block of code. It looked sort of like this:
explain dbitrace(
name => 'Full stack transaction request',
code => sub { $object->make_full_request(\%request_data) },
save => '/tmp/all_sql.txt',
);
The summary output looked similar to this:
{
report => {
name => 'Full stack transaction request',
time => '3.70091 wallclock secs'
},
sql => {
delete => 1,
insert => 7,
select => 137,
update => 32,
total => 177,
}
}
We had a problem. Even our client was surprised about the amount of database activity for a single "buy this thing" request.
None of the database activity was particularly slow, but there was a lot of it. Deadlocks weren't an issue given that the changed data was only for the current request, but the ORM was killing us.
I love working with a good ORM, but ORMs generally trade execution speed for developer speed. You have to decide which is more important to you. Further, in two decades of working with ORMs, I have only once seen an in-house ORM which was on-par with, or superior to, commercial or open source products. And it was an ORM optimized for reporting, something many ORMs struggle with.
For our client's ORM, every time a request was made it would gather a bunch of metadata, check permissions, make decisions based on whether or not it was using Oracle or PostgreSQL, check to see if the data was cached, and then check to see if the data was in the database. Instantiating every object was very slow, even if there was no data available. And the code was creating—and throwing away without using—hundreds of these objects per request.
We considered using a "pre-flight" check to see if the data was there before creating the objects, but there was so much business logic embedded in the ORM layer that this was not a practical solution. And we couldn't simply fetch the data directly because, again, the ORM had too much business logic. We had to reduce the calls to the database.
After an exhaustive analysis, we discovered several things.
Our first step at addressing the problem was to ensure that everything was wrapped in configuration variables that allowed us to easily turn on or off different code paths for our project. Fortunately, the client had a system that allowed them to update the configuration data without restarting the application servers, so this made our choice much safer.
Once that was in place, our first pass cut our SQL calls roughly in half, tremendously sped up the code, and the tests still passed. But we were nowhere near 500 transaction per second.
It's said that the three most common bugs in software are cache invalidation and off-by-one errors. And we had caching problems in spades.
We couldn't afford cache misses during the event, so we needed to "preheat" the caches by ensuring all information was loaded on server startup. Except that we had a few problems with this.
First, it was slow because there was a lot of data to cache. If we needed to rapidly bring new servers online during the event, this was not an option.
Second, it consumed a lot of memory and we were concerned about memory contention issues. Disk swapping was not an option.
Third, the app caches primarily used per-server memcached instances, but the data was global, not per-server, thus causing a lot of unnecessary duplication. Shawn already knew about this, so one of the first things he did was set up a secure Redis cluster with failover to replace memcached, where appropriate. Since we only had to heat the cache once, bringing up servers was faster, and we significantly reduced per-server memory consumption.
The application itself also used heavy in-memory caching (implemented as hashes), which we replaced with pre-loaded shared cache entries, thereby lowering memory requirements even further.
As part of this work, we centralized all caching knowledge into a single namespace rather than the ad-hoc "per module" implementations. We also created a single configuration file to control all of it, making caching much simpler for our client. This is one of the many features we added that they still use today.
Another serious bottleneck was their SOAP server. Our client made good use of WSDL (Web Services Description Language) to help their customers understand how to create SOAP requests and SOAP was integral to their entire pipeline. The client would receive a SOAP request, parse it, extract the necessary data, process that data, create another SOAP request, pass this to back-end servers, which would repeat the process with the new SOAP request.
SOAP stands for "Simple Object Access Protocol." But SOAP isn't "objects", and it's not "simple." It's a huge XML document, with an outer envelope telling you how to parse the message contents. Reading and writing SOAP is slow. Further, our client's SOAP implementation had grown over the years, with each new version of their SOAP interface starting with cutting-and-pasting the last version's code into a new module and modifying that. There were, at the time of the project, 24 versions, most of which had heavily duplicated code. To optimize their SOAP, we were facing a problem. However, we dug in further and found that only one version would be used for this project, so our client authorized us to skip updating the other SOAP versions.
We tried several approaches to fine-tuning the SOAP, including replacing
many AUTOLOAD
(dynamically generated)
methods with static ones. In Perl, AUTOLOAD
methods are optional "fallback" methods that are used when Perl cannot find a
method of the desired name. However, this means Perl must carefully walk
through inheritance hierarchies to ensure the method requested isn't there
before falling back to AUTOLOAD
. This can
add considerable overhead to a request. For this and other reasons, the use of
AUTOLOAD
is strongly discouraged.
Replacing these methods was extremely difficult work because the AUTOLOAD
methods were used heavily, often calling
each other, and had grown tremendously over the years. Many of them were
extremely dangerous to pick apart due to their very complex logic. We managed
to shave some more time with this approach but stopped before we tackled the
most complicated ones. There was only so much risk we were willing to
take.
Noel, in carefully reading through the SOAP code, also found several code paths that were slow, but didn't apply to our requests. Unfortunately, we could not simply skip them because the SOAP code was tightly coupled with external business logic. Skipping these code paths would invariably break something else in the codebase. What he proposed, with caution, is the creation of a special read-only "request metadata" singleton. Different parts of the code, when recognizing they were in "web context", could request this metadata and skip non-essential code paths. While singletons are frowned upon by experienced developers, we were under time pressure and in this case, our SOAP code and the code it called could all consult the singleton to coordinate their activity.
The singleton is one of the many areas where deadlines and reality collide. Hence, the "Devil Went Down to Georgia" quote at the beginning of this case study. We were not happy with this solution, but sometimes you need to sacrifice "best practices" when you're in an emergency situation. We alerted our client to the concern so they could be aware that this was not a long-term solution.
We also leveraged that singleton to allow us to alert the back-end that encrypted transaction data was available directly via Redis. The back-end merely needed to decrypt that data without the need to first deserialize SOAP and then decrypt the data. Another great performance improvement. Sadly, like many others improvements, it was specific to this one customer and this one payment provider.
However, this approach allowed us to remove even more SQL calls, again providing a nice performance boost.
By this time, with the above and numerous other fixes in place, we were ready to do our initial QA runs. We didn't expect to hit our 500 TPS target, but we were pretty confident we had achieved some major speed gains. And, in fact, we did have some pretty impressive speed gains, except that periodically some of our requests would simply halt for several seconds. Due to the complicated nature of the system, it wasn't immediately clear what was going on, but we finally tracked down an issue with the tax server.
Our client was processing credit card transactions and for many of them, taxes had to be applied. Calculating taxes is complicated enough that there are companies that provide "tax calculation as a service" and our client was using one of them. Though the tax service assured us they could handle the amount of traffic we were sending, they would periodically block. It wasn't clear if this was a limitation of their test servers that we would avoid with their production servers, but we could not take this chance.
We tried several approaches, including caching of tax rates, but the wide diversity of data we relied on to calculate the tax meant a high cache miss rate, not allowing us to solve the problem. Finally, one of our client's developers who knew the tax system fairly well came up with a great solution. He convinced the tax service to provide a "one-time" data dump of tax rates that would not be valid long but would be valid long enough for our short event. We could load the data into memory, read it directly, and skip the tax server entirely. Though the resulting code was complicated, it worked, and our requests no longer blocked.
With the above, and many other optimizations, we felt confident in what we delivered and in a late-night test run, our client was ecstatic. We were handling 700 transactions per second, almost twenty times faster than when we started. Our client hired us because they knew we could deliver results like this. Now it was time for our first production run, using beefier servers and a much faster network.
Cue the "sad trombone" music. We were only running about 200 to 300 transactions per second. As you may recall, the client had been migrating from Oracle to PostgreSQL. The QA servers were far less powerful than the production servers, but they were running PostgreSQL. The production servers were running Oracle. Oracle is the fast, beastly sports car that will quickly outpace that Honda Accord you're driving ... so long as the sports car has an expert driver, constant maintenance, and an expensive, highly trained pit crew to look after it.
Out of the box, PostgreSQL just tends to be fast. Often companies find that a single PostgreSQL DBA working with competent developers is enough to easily handle their traffic. But we had Oracle. And it wasn't going away before the deadline. Our first two weeks was up and our proof of concept worked, but greatly exceeding client requirements still wasn't fast enough.
However, this was good enough for the proof of concept, so it was time to nail this down. It was going to be more nights and weekends for us, but we were having a huge amount of fun.
Oracle wasn't the only problem, as it turns out. This faster, higher capacity network had switches that automatically throttled traffic surges. This was harder to diagnose and work around but alleviated the networking issues. Interestingly, it was Leïla who spotted that problem simply by listening carefully to what was being said in meetings. She has this amazing ability to hear when something isn't quite right.
With the use of Oracle being a bottleneck, we had to figure out a way to remove those final few SQL statements. Our client suggested we might be able to do something unusual and it's based on how credit cards work.
When you check into a hotel and reserve your room with a credit card, your card is not charged for the room. Instead, they "authorize" (also known as "preauthorize") the charge. That lowers the credit limit on your card and reserves the money for the hotel. They will often preauthorize for over the amount of your bill to allow a small wiggle room for incidental charges, such as food you may have ordered during your stay.
Later, when you check out, they'll charge your card. Or, if you leave and forget to check out, they have a preauthorization, so they can still "capture" the preauthorization and get the money deposited to their account. This protects them from fraud or guests who are simply forgetful.
In our case, the client often used preauthorization for payments and after the preauthorization was successful, the card would be charged.
It worked like this: the front-end would receive the request and send it to the back-end. The back-end would submit the request for preauthorization to the payment provide and the payment provider would respond. The back-end sent the response to the front-end and if the preauthorization was denied, the denial would be sent back to the customer. However, usually it was approved and the front-end would then submit the charge back to the back-end. The back-end would then submit the preauthorized charge to the payment provider and lots of network and database activity helped to keep the server room warm. The entire process was about as fast as a snail crawling through mud.
What the client pointed out is that the money was reserved, so we could charge the card after the event because we had already preauthorized it. Instead, we could serialize the charge request and store it in an encrypted file on the front-end server (with the decryption key unavailable on those servers). Later, a utility we wrote read and batch processed those files after the event, allowing us to finish the transaction processing asynchronously.
This worked very well and by the time we were done, our changes to the code
resulted in a single SQL SELECT
statement. Further, after this
and a few other tweaks, we were easily able to hit 500 transactions per second
on their production system. When the event happened shortly after, the code
ran flawlessly.
Increase the performance of Business Transactions from 39/sec to 500+/sec.
The overall implemented solution could not change the outward facing API calls as end users of the service were not to be impacted by back-end changes. The solution could also not effect the traditional processing as clients would be issuing both traditional and streamlined transactions.
Implement a new redundant shared caching architecture using Redis as a data store, to replace the existing on application server memcached instances.
Update existing application code to remove the use of internal application caches (implemented as hashes), and replace with pre-loaded shared cache entries.
The new caching system caches items using both the legacy and the new caching system, so that production systems can be transitioned to the unified caching system without downtime.
Allowed a cache storage back-end to define its storage scope, so that caches can be managed based on the storage locality:
Create an additional data storage path that replaces storing intermediate data in the back-end shared database with the shared caching architecture.
Remove the use of a third party provider API call, and replace with a static table lookup.
As data processing in real time is not a requirement, add a data path that allows for separation of the front end API responses from the third party back-end processing. This allowed for heavy back-end processes to be deferred and processed in smaller batches.
Worked closely with the client to determine which parts of the process are required during the processing, and which can be bypassed to save overhead.
Code review and clean up. Refactor code base to remove extraneous or ill-performing legacy code.
The process was re-engineered to be configurable allowing the same pipeline to be reimplemented for future events/customer requirement through simple documented configuration options, while not impacting traditional processing.
This information was compiled from our reports during this project and not written while the project was ongoing. Some events may not have happened in the exact sequence listed above.
Please leave a comment below!
If you'd like top-notch consulting or training, email me and let's discuss how I can help you. Read my hire me page to learn more about my background.
Copyright © 2018-2023 by Curtis “Ovid” Poe.
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Team Marjaavaan comes together to celebrate the success of the film
by Diya BachchaniMarjaavaan starring Sidharth Malhotra, Ritiesh Deshmukh, Tara Sutaria and Rakul Preet Singh released last Friday and in a week, the film has done good business at the box-office. Directed by Milap Zaveri the film has equal amounts of romance, action and drama which have connected with the audience even though the critics gave it a mixed response.
Last night, the makers held a success bash for the film at hotspot in the city. The shutterbugs clicked Sidharth Malhotra, Riteish Deshmukh, Genelia Deshmukh, Nora Fatehi, Milap Zaveri, Nushrat Bharucha attending the success bash of the film. We definitely missed Tara Sutaria’s presence at the celebration, but guess the Bollywood hottie is busy with other projects. Scroll through for pictures.


THE IRON GIANT
Reviewed by Harvey Karten, Ph.D. Warner Bros. Director: Brad Bird Writer: Brad Bird (story) Tim McCanlies (screenplay), based on the book "The Iron Man" by Ted Hughes Cast: Voices of Jennifer Aniston. Harry Connick, Jr., Eli Marienthal, Christopher MacDonald, John Mahoney, J. Emmett Walsh, Cloris Leachman
If your kids are not into heavy metal, there's no better way to introduce them to the genre than by taking them to "The Iron Giant." With a month remaining to the summer, I'll wager this will iron out as the summer's best family film, "Tarzan" notwithstanding. There are benefits for adults as well. 1) The usual mature stuff is thrown into this well-written, non-preachy morality tale; 2) the adult paraphernalia will soar over the head of the small fry but will glide by so quickly they won't notice that they've missed a thing; 3) the picture at eighty minutes in length does not overtax its invitation; 4) best of all, there's no Broadway soundtrack or icky songs. The strangest business about this movie, a circumstance that doesn't bode well for human actors in this age of digitalized everything, is that when bad things happen to the title character, you may actually feel like shedding a tear. That's how well-developed the big metal monster is, while at the same time the human, er, animated people are three-dimensional. With voices like Jennifer Aniston's as the concerned mom, Eli Marienthal's as the principal kid Hogarth Hughes, Vin Diesel's as the Giant and Christopher McDonald's as the (of course) villainous government agent, Warner Bros. has on its hands a package that is well-written, appropriately soundtracked, though with animation that falls way short of the "Tarzan" density--but with a genuine story to tell, who cares?
Brad Bird, who directs the picture which was co-written by Tim McCanlies from a Ted Hughes book, keeps the action situated in 1957 for good reason. The 50's was the duck- and-cover decade, a time that schoolchildren were convinced they could not be touched by nuclear weapons as long as they had a school desk to crouch under. With the U.S. government seeing a Communist conspiracy under every rock and with the possibility that the Iron Giant could be a Red- created Trojan horse, the Pentagon could not be expected to restrain itself form using the ultimate weapon on a seemingly indestructible force. Or as one agent says, if it's not made in the U.S., "we'll blow it to kingdom come." The story takes place in the picturesque town of Rockwell, Maine, home of 10-year-old Hogarth Hughes (voice of Eli Marienthal) and his mother Annie (voice of Jennifer Aniston). From the beginning we are privy to the boy's interest in pets. He's had a raccoon that caused mayhem and his mom will therefore not allow him to adopt the squirrel he has smuggled into his mother's coffee shop. One night, Hogarth goes into the woods to check out a noise. Confronting the 100-foot giant that some local seamen had reported seeing, he is at first afraid, but when he cuts the power to an large electric generator that the giant was in the process of eating--thereby saving the big guy from the shock of his life--the two become friends. Hogarth and a beatnik artist neighbor whose work consists of selling scrap iron and turning some of the product into sculptures are ultimately pitted against the forces of government agent Kent Mansley (Christopher McDonald) and the U.S. army--who are determined to cut the behemoth down.
Throughout the tale, we become convinced that its writers are politically anti-violence, whether the savagery consists of attempts at destroying the friendly Frankenstein monster or of shooting the local deer for pure sport. The Iron Giant himself can represent any human beings who are treated in our society with less than toleration. Interestingly enough, Hogarth teaches the townspeople to call the Giant HIM and not IT--perhaps the key moral point that the picture makes-- since we human beings have the tendency to depersonalize anyone we hate to make ourselves appear less culpable when attacking.
Comic touches abound throughout, both the visual imagery (the way Hogarth's eyeballs frequently rotate when he is thinking deeply or reacting to stimuli) or verbal (as the beatnik Dean McCoppen, voiced by Harry Connick Jr., whines that he can easily sell his scrap iron "but when I turn it into art, I can't give it away").
The film's greatest success lay in audience reaction. At the sneak preview screening I attended, which was populated by a massive colony of small fry, there was not a peep in the audience--a situation which is all too rate with the constituency of a mature adult film.
Rated PG. Running Time: 80 minutes. (C) 1999 Harvey Karten
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This is a page dedicated to show how beautiful and delicious is the best Brazilian delicatessen: coxinha!
It may be found in many variations, as below.
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A Review From the Middle Seat Center
There is a widely held theory that a giant meteor slammed into the Earth, 65 million years ago and knocked the dinosaurs off their high perch as the dominant species of this planet. There is also a widely held belief that one day another meteor will strike and knock Man from that same lofty position. The first is just a theory that has never really been proven as fact, and the latter is just idle speculation. But while we are on the subjects of theories and speculations, I would like to discuss another theory that is gaining popularity and acceptance. This new train of thought is not coming out of such distinguished places as MIT, or Stanford, but out of Hollywood. That is the theory that if you can dazzle your audience with enough special effects, fast-paced editing, loud enough soundtracks, and constant camera movements, you can convince them that instead of seeing something that is substandard, they are really seeing something great; something that they can sit and stare in awe at; something that they can recommend to their friends to do too. Unfortunately, for us, the movie-going-public, many studios, producers, directors, and to some extent, writers, are moving forward with this theory and trying to prove it as fact. Touchtone pictures just spent 140 million dollars and exposed two-and-a-half hours of film stock to try and prove this Hollywood hypothesis by bringing us, ARMAGEDDON. Directed by Michael Bay(BAD BOYS, THE ROCK)and staring action hero icon, Bruce Willis, ARMAGEDDON is a special effects filled, high octane thrill ride where images are thrown at you almost at the speed at which the meteor in the film is approaching Earth at, 27,000 miles per hour. Then thanks to the fast-paced editing and a camera that hardly ever stays in one place for more than a few seconds, these visuals are gone in the blink of an eye, thus giving the illusion that something spectacular and exciting is happening up on the screen when it is all just smoke and mirrors. Sadly, this is what is happening in ARMAGEDDON.Unlike its predecessor, DEEP IMPACT, this "mankind is doomed" tale relied on its special effects and directorial style to tell its story, rather than its characters. After an orbiting space shuttle and parts of New York City are destroyed by a hail of meteors the size of basketballs and small cars, NASA realizes that that was just a precursor and that another meteor the size of Texas will arrive in just 15 days and end Man's reign on Earth. Our only hope is to land a team of deep-core drillers on the space rock, drill an 800-foot deep hole, drop a nuke in it, then leave and detonate from a safe distance. Simple. Right? Of course, Willis is the best driller on the planet and is tapped to do the job. After insisting that he take his own team, we are introduced to a group of cliched, social misfits that are far from having the "Right Stuff." The group consists of: the young hot shot(played by Ben Affleck)that is also involved in a weak subplot romance with Willis' daughter(played by Liv Tyler), the loyal best friend, the comedy relief character, the token black, the loveable fat guy, and a couple of throw away characters that you know won't last long after the mission begins. We also pick up a kooky Russian cosmonaut along the way. But the cliches don't end there. Once the mission is underway, everything that can go wrong, does go wrong. More than once we hear that the mission has failed and that Earth is doomed. At one point, CNN goes off the air so they can be with their families. We get everything: they landed at the wrong site and the rock there will be tougher to drill through, the surface of the meteor is breaking up around them, they are running out of drill heads and transmissions, the time to safely explode the bomb so the meteor will be split in half and miss the Earth is running out, and the shuttle will not start when it is time to haul ass.And that is just a few. There is even a series of events on the ground where the old "scientists vs. the mility" senario is played out. Then there is an ending that anyone with half a brain can see coming a mile away. What all this boils down to is poor script writing. Not only is the script full of cliches, but they are plot holes big enough for this Texas-sized meteor to pass through. It has been reported that at least nine writers contributed to the script. Never a good sign. But as we discussed earlier, the thinking is you can cover all this up with dazzling special effects, fast editing, and dizzying camera movements. But while that is fun and exciting to look at, it is lazy film making. The story should be first and foremost and the rest should be used to enhance that story. It is on this point that ARMAGEDDON failed and DEEP IMPACT succeeded. The latter was character driven. While ARMAGEDDON was character driven to a small degree(especially at the end), it was a road we had all been down many times before. There is a line in the movie where after seeing the motley crew that has been assembled to save the world, someone says, "Is that the best you could do?" After seeing ARMAGEDDON, we should be asking the same of the director and screen writers.
Staring: Bruce Willis, Ben Affleck, Liv Tyler, Billy Bob Thornton, Will Patton, and Steve Buscemi. Rated PG-13 for intense situations I Give it ** out of a possible four.
That was the view from The Middle Seat Center. John Collins
The review above was posted to the
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review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
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Habari's upgrade process is designed to be transparent, with the only indication that an upgrade is happening being a slightly longer page load time the first time the site is visited after the software is updated.
Before making any major change in your Habari installation, it would be prudent to create a backup of your database and your installation, in particular all the files in your Habari /user directory. The /user directory should contain all files which you have customized - plugins you have installed, themes you have installed, class files you may have modified, or locale files you have installed.
Version 0.7 incorporates many changes from the previous version, both in bug fixes and new features. For details see the release notes.
There are four major changes that have the potential to break your installation.
Your theme files may need to be updated, but to even be activated the theme's type needs to be properly set in the theme.xml file.
If that file currently looks like this:
you must change it as follows:
<?xml version="1.0" encoding="UTF-8" ?>
<theme>
<name>Blah...
...
</theme>
That '''class''' must match (including case) the class name in your theme. For example, the Blah theme would have the following line in theme.php:
<?xml version="1.0" encoding="UTF-8" ?>
<pluggable type="theme">
<name>Blah...
<class>Blah</class>
...
</pluggable>
class Blah extends Theme
{
You must deactivate all plugins when upgrading to version 0.7 as version 0.6 plugins are not compatible with version 0.7. The core plugins, those that come with Habari, have all been updated. Most of the plugins in the extras repository have also been updated. You can download a zip archive of plugins from the Habari webpage. You should choose the version tagged 0.7 or trunk if there is no 0.7 tag yet. If you find a plugin in the extras repository that is not updated for 0.7, ask on [[IRC]] and someone will likely fix it for you immediately.
If you get the error Cannot override final method Plugin::info(), that means you have upgraded to 0.7 while an incompatible plugin is active. To recover your site, either upgrade the plugin or find the offending plugin in your Habari installation, and move the whole directory for that plugin out of the plugins directory.
To fix your own plugins, you need to add an XML configuration file, as described on the page Creating a Plugin, and remove the function called info() from the plugin code. The file for the plugin code is called, for example, myplugin.plugin.php in the plugin's directory.
To make it easier for plugins to customize comment forms, for example for spam prevention, comments must now be submitted through a FormUI comment form. This has been possible for some time, so many forms already use this method. If your theme submits comments through a normal HTML form, they won't be saved. Adding a Comment Form describes how to add and customize Habari's comment form.
If your theme or a plugin retrieves tags, upgrading to version 0.7 is likely to break that code. This is because internally, the Habari tags system now uses the Taxonomy system. On a technical level, Tag is now a subclass of the Term class, and Tags is a subclass of the Vocabulary class, so the tag-specific database tables, tags and tag2posts, aren't used any more. The tables will still be in your database, and will be removed in a later upgrade.
Specifically, if your theme does something like this, in 0.7 the tags retrieved will not be up to date and an error is likely to occur.
This code can be changed to the following to get an alphabetical listing of the tags.
$tags = DB::get_results( 'SELECT * FROM ' . DB::table('tags') );
$tags = Tags::vocabulary()->getTree( 'term_display ASC' );
In addition, themes often use code similar to the following to see whether to output a post's tags or not:
This will no longer work. Post tags are no longer stored as an array of text strings. They are now an ArrayObject of Tag objects. A suitable replacement for the above code is:
<?php if( is_array( $post->tags ) ) : ?>
For the same reason, this code will no longer work:
<?php if( count( $post->tags ) ) : ?>
In it's place use:
<?php if( in_array( 'Some tag', $post->tags ) ) : ?>
See this post to the -dev mailing list for more details.
<?php if( $post->tags->has( 'Some tag' ) ) : ?>
Additionally, the way that posts are retrieved according to the tags that are attached to them has changed. Previously, you might have used something like the following:
Those posts should now be retrieved through the tags vocabulary.
<?php $asides = Posts::get( array( 'tag' => 'asides' ) ); ?>
See the Retrieving Posts page for more details.
<?php $asides = Posts::get( array( 'vocabulary' => array( 'tags:term' => 'asides' ) ) ); ?>
For specific upgrade instructions for earlier versions of Habari, see the full upgrade notes on the wiki.


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Asians & COVID-19
Jump in the shoes of an Asian person living in a time where Asians are being discriminated as a result of the COVID-19 pandemic. How would you confront the world?
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--- layout: post title: ! 'GIANT ROBOTS SMASHING INTO OTHER GIANT ROBOTS: Internet: Stop being so Internety' published: true date: 2010-10-06 categories: [] posterous_url: http://blog.hungerandthirstdesign.com/post/1256508776/internet-stop-being-so-internety posterous_slug: post/1256508776/internet-stop-being-so-internety --- http://robots.thoughtbot.com/post/1256508776/internet-stop-being-so-internety
Recently Gap redesigned their logo and I’m bothered by how we, the design community, are often responding. Dribbble and Twitter are great tools. I use both of them frequently. They are also vessels for people to freely speak their mind. Unfortunately, it’s too often used to degrade and belittle…


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