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  • Pass variables between separate instances of ruby (without writing to a text file or database)

    - by boulder_ruby
    Lets say I'm running a long worker-script in one of several open interactive rails consoles. The script is updating columns in a very, very, very large table of records. I've muted the ActiveRecord logger to speed up the process, and instruct the script to output some record of progress so I know how roughly how long the process is going to take. That is what I am currently doing and it would look something like this: ModelName.all.each_with_index do |r, i| puts i if i % 250 ...runs some process... r.save end Sometimes its two nested arrays running, such that there would be multiple iterators and other things running all at once. Is there a way that I could do something like this and access that variable from a separate rails console? (such that the variable would be overwritten every time the process is run without much slowdown) records = ModelName.all $total = records.count records.each_with_index do |r, i| $i = i ...runs some process... r.save end meanwhile mid-process in other console puts "#{($i/$total * 100).round(2)}% complete" #=> 67.43% complete I know passing global variables from one separate instance of ruby to the next doesn't work. I also just tried this to no effect as well unix console 1 $X=5 echo {$X} #=> 5 unix console 2 echo {$X} #=> "" Lastly, I also know using global variables like this is a major software design pattern no-no. I think that's reasonable, but I'd still like to know how to break that rule if I'd like. Writing to a text file obviously would work. So would writing to a separate database table or something. That's not a bad idea. But the really cool trick would be sharing a variable between two instances without writing to a text file or database column. What would this be called anyway? Tunneling? I don't quite know how to tag this question. Maybe bad-idea is one of them. But honestly design-patterns isn't what this question is about.

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  • What does @@variable mean in Ruby?

    - by Andrew
    What are Ruby variables preceded with double at signs (@@)? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP: PHP version class Person { public $name; public function setName($name) { $this->name = $name; } public function getName() { return $this->name; } } Ruby equivalent class Person def set_name(name) @name = name end def get_name() @name end end What does the double at sign @@ mean, and how does it differ from a single at sign?

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  • How do I pass session variables from one domain to another in PHP

    - by Dave
    Hi everyone, I have encountered a situation where I need to pass $_SESSION variables from one domain to an iFrame page from another domain. I have spent the last 16 days trying various methods to no avail. I think that the only logical way would be to encode the variables in the url that calls the iFrame and decode them in th iFrame page. I am not sure how to go about this and I am looking for any samples, assistance etc that I can find. Thanks for any and all suggestions. Here is an example of what I am trying to do... Example: <!-- Note only using hidden as I didn't want to build the form at test phase--> <form name="test" method="post" action="iframe_test.php"> <input type="submit" name="Submit" /> <input type="hidden" name="fName" value="abc" /> <input type="hidden" name="lName" value="def" /> <input type="hidden" name="address1" value="ghi" /> <input type="hidden" name="address2" value="jkl" /> <input type="hidden" name="country" value="mno" /> <input type="hidden" name="postal_code" value="pqr" /> <input type="hidden" name="city" value="stu" /> <input type="hidden" name="retUrl" value="vwx"> <input type="hidden" name="decUrl" value="yz"> So from here I am hitting the iframe_test.php and doing the following: PHP Code: function StripSpecChar($val) { return (preg_replace('/[^a-zA-Z0-9" "-.@\:\/_]/','', $val)); } foreach ($_POST as $key => $val) { $_SESSION[$key] = StripSpecChar($val); } and I get a session array that looks like this: Code: Array ( [fName] => abc [lName] => def [address1] => ghi [address2] => jkl [country] => mno [postal_code] => pqr [city] => stu [retUrl] => vwx [decUrl] => yz ) Still all good so far....call the iFrame Code: <body> Some page stuff here <div align="center"><span class="style1"><strong>This is the iFrame Page</strong></span> </div> <div align="center"> <iframe src="https://www.other_domain.org/iframe/reserve.php" width="500" height="350" frameBorder="0"></iframe> </div> </body> So HOW do I take... $_SESSION['fName']['abc']; $_SESSION['lName']['def']; $_SESSION['address1']['ghi']; $_SESSION['address2']['jkl']; $_SESSION['country']['mno']; $_SESSION['postal_code']['pqr']; $_SESSION['city']['stu']; $_SESSION['retUrl']['vwx']; $_SESSION['decUrl']['yz']; and turn it into the encoded url that I am looking for? Further once that is done how to I get the session vars back as session vars on that new domain iFrame page...

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  • Django - Weird behaviour of sessions variables with Apache

    - by Étienne Loks
    In a Menu class with Section children, each Section has an available attribute. This attribute is initialized during the instance creation. The process of getting the availability is not trivial, so I stock a Menu instance for each user in a session variable. With the Django embedded webserver this works well. But when I deploy the application on an Apache webserver I can observe a very weird behavior. Once authentified, a click on a link or a refreshment of the page and the availability of each Section seems to be forgotten (empty menu but in the log file I can see that all Sections are here) then a new refresh on the page the availability is back, a new refresh the menu disappears once again, etc. There is no cache activated on the web server. The menu is initialized in a context processor. def get_base_context(request): if 'MENU' not in request.session or \ not request.session['MENU'].childs or\ request.session['MENU'].user != request.user: _menu = Menu(request.user) _menu.init() request.session['MENU'] = _menu (...) I have no idea what could cause such a behavior. Any clue?

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  • How to configure path or set environment variables for installation?

    - by Orr22
    I'm aiming to install APE in Ubuntu 14.04 LTS, a simple code for pseudopotential generation. I'm having this error message while running ./configure: checking for gsl-config... no checking for GSL - version >= 1.0... no *** The gsl-config script installed by GSL could not be found *** If GSL was installed in PREFIX, make sure PREFIX/bin is in *** your path, or set the GSL_CONFIG environment variable to the *** full path to gsl-config. configure: error: could not find required gsl library I checked and I have the GSL already installed: :~/Programas/ape-2.2.0$ dpkg -l | grep gsl ii libgsl0ldbl 1.16+dfsg-1ubuntu1 i386 GNU Scientific Library (GSL) -- library package So I have the library but the program installation isn't finding it. Any help? Thanks in advance

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  • Question on PL/SQL - Evaluate the PL/SQL block given above and determine the data type and value of each of the following variables [closed]

    - by Annie
    DECLARE v_custid NUMBER(4) := 1600; v_custname VARCHAR2(300) := 'Women Sports Club'; v_ new_custid NUMBER(3) := 500; BEGIN DECLARE v_custid NUMBER(4) := 0; v_custname VARCHAR2(300) := 'Shape up Sports Club'; v_new_custid NUMBER(3) := 300; v_new_custname VARCHAR2(300) := 'Jansports Club'; BEGIN v_custid := v_new_custid; v_custname := v_custname || ' ' || v_new_custname; END; v_custid := (v_custid *12) / 10; END; /

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  • UIView drawRect; class variables out of scope

    - by Toby Wilson
    Short & sweet version of my last question in light of new information. I have a UIVIew with an init and a drawrect method (and another thread and a bunch of other stuff, but I'll keep it short & sweet). All of the class variables that I alloc and init in the -(id)init method are out of scope/nil/0x0 in the drawRect method, and I am unable to access them. For example; In the interface: NSObject* fred; In the implementation: -(id)init { if(self == [super init]) { fred = [[NSObject alloc] init]; } return self; } -(void)drawRect:(CGRect)rect { NSLog(@"Fred is retained %i times",[fred retainCount]); //FAIL NSLog(@"But his variable is actually just pointing at uninitialised 0x0, so you're not reading this in the debugger because the application has crashed before it got here." } Should add that init IS being called before drawRect also. Anyone have any ideas?

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  • Ant trouble with environment variables on Ubuntu

    - by Inaimathi
    Having some trouble with with ant reading environment variables in Ubuntu 9.10. Specifically, the build tasks my company uses has a token like ${env.CATALINA_HOME] in the main build.xml. I set CATALINA_HOME to the correct value in /etc/environment, ~/.pam_environment and (just to be safe) my .bashrc. I can see the correct value when I run printenv from bash, or when I eval (getenv "CATALINA_HOME") in emacs. Ant refuses to build to the correct directory though; instead I get a folder named ${env.CATALINA_HOME} in the same directory as my build.xml. Any idea what's happening there, and/or how to fix it?

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  • How do you give variables reference in javascript?

    - by Eric
    I want to give variables reference in javascript. For example, I want to do: a=1 b=a a=2 and have b=2, and change accordingly to a. Is this possible in javascript? If it isn't is there a way to do like a.onchange = function () {b=a}? What I wanted to do was make a function like makeobject which make an object and puts it in an array and than returns it like function makeobject() { objects[objects.length] = {blah:'whatever',foo:8}; } so than I could do a=makeobject() b=makeobject() c=makeobject() and later in the code do for (i in objects) { objects[i].blah = 'whatev'; } and also change the values of a,b and c

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  • Js constants with variables inside.

    - by johnnyArt
    I know I'm able to this in PHP, but I can't remember the name or the way to do it, so I'll just explain what it is, and when someone tells me how it's called I'll update this question. I have some error messages defined as constants on javascript, however, some of those messages need to contain dynamic part as in the following example. "The username must be between 4 and 20 characters" In php, If I'm not mistaken there was some option for storing that string in a way that when called it would replace the variables with the data provided on the call. I want to do that on javascript, something like: config['string',vars] And have javascript insert those vars inside the string so it's customized. Wow, this must be the worst question I've made! I'm sorry for the lack of information, I'm kinda braindead on Sundays.

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  • Create New Pseudo Variables in Squeak

    - by Artium
    Large part of squeak is implemented using squeak itself. I am curious to know if pseudo variables such as self or true are also implemented using squeak. If the answer is yes, where the implementation located? Specifically, assume that I want to add new subclass of "Boolean" called "Other" which will represent a third option: neither true nor false. I want that other, the only instance of Other to be similar to the true/false global singletons. Any ideas? Thank you.

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  • Lexical and dynamic scoping in Mathematica: Local variables with Module, With, and Block

    - by dreeves
    The following code returns 14 as you'd expect: Block[{expr}, expr = 2 z; f[z_] = expr; f[7]] But if you change that Block to a Module then it returns 2*z. It seems to not matter what other variables besides expr you localize. I thought I understood Module, Block, and With in Mathematica but I can't explain the difference in behavior between Module and Block in this example. Related resources: Tutorial on Modularity and the Naming of Things from the Mathematica documentation Excerpt from a book by Paul R. Wellin, Richard J. Gaylord, and Samuel N. Kamin Explanation from Dave Withoff on the Mathematica newsgroup

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  • Static Class Variables in Dynamic Library and Main Program

    - by Paul
    I am working on a project that has a class 'A' that contains a static stl container class. This class is included in both my main program and a .so file. The class uses the default(implicit, not declared) constructor/destructor. The main program loads the .so file using dlopen() and in its destructor, calls dlclose(). The program crashes after main exits when glibc calls the destructor for the static class member variable. The problem appears to be that when dlclose() is called, the destructor for the static variable is called, then when main exits() glibc also calls the destructor, resulting in a double free. I have 2 questions, namely: 1) In this particular case, why are there not two copies of the static variable(yes i know that sounds somewhat ridiculous, but since both the main program and .so file have a separately compiled 'A', shouldn't they each have one?) 2) Is there any way to resolve this issue without re-writing class 'A' to not contain static member variables?

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  • Referencing Environment Variables in web.xml

    - by Udi Bar-On
    I'm pre-packaging a JSP web-app that relies on some file path settings found within web.xml. These settings are unknown at packaging time, because they reference a path the customer will set when deploying the entire application (of which the web-app is a management interface). It seems that the easiest way to avoid tokens and file modifications in my installer script, is to ask the user for an install location, set this location as an environment variable (e.g JAVA_HOME), and have web.xml always reference that variable. Is there a way to reference an environment variable value from within web.xml? Google searches lead to the J2EE method of SETTING environment variables from ejb xml files. This is not what I'm looking for. Thanks Udi

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  • Error loading Variables stage.loaderInfo - AS3

    - by Dimitree
    I have a Document class that loads variables from Facebook with the use of stage.loaderInfo var connect:FacebookConnectObject = new FacebookConnectObject( facebook, API_KEY, this.stage.loaderInfo ); But when I change the Document class (with another one responsible for the layout of my app), and try call the above from a movieclip that exists in my application with the use: var facebook_class:FacebookAp = new FaceBppkApp addChild(facebook_class) I get error TypeError: Error #1009: Cannot access a property or method of a null object reference. I believe the error comes fro this line this.stage.loaderInfo since I changed the scope... How I am supposed to fix that?

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  • Global variables in jQuery

    - by Thorpe Obazee
    I have been working on this script: <script type="text/javascript" src="/js/jquery.js"></script> <script type="text/javascript"> $(function(){ compentecy = $('#competency_id'); $('#add_competency').bind('click', function(e){ e.preventDefault(); $.post('/script.php', {competency_id: compentecy.val(), syllabus_id: 2}, function(){ // competency = $('#competency_id'); competency.children('option[value=' + compentecy.val() + ']').remove(); }); }); }); </script> in the $.post callback function, it seems that I can't access global variables. I tried $.competency but it didn't work. I always get a "competency is undefined" error. I had to reinitialize the variable once again inside the callback. Is there a way to NOT reinitialize the variable inside the callback?

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  • Running Script before/after Variables declared?

    - by Sam
    Hi folks. As i understand javascript .js files are best to put all the way at the bottom of html pages, to speed up loading of rest of page. Advised by Yslow(Yahoo) and Page Speed(google). Now, when in the middle of page some thing RUNS a javascript script, in Internet Explorer, i see a small warning message saying that the element is: Uncaught ReferenceError: SWFObject is not defined When i put my all.js file in the had, the error goes away but page load slows doen. What to do? Actually, i remember it was the same with php variables. If i RUN php but the variable comes later, then it just doesnt work. must define the variable first, for it to run. How to make this workflow better, in case of php scripts? and in case of javsscripts? Thanks!

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  • - Default value of variables at the time of declaration -

    - by gotye
    Hey guys, I was wondering what was the default values of variables before I intialize them .. For example, if I do : //myClass.h BOOL myBOOL; // default value ? NSArray *myArray; // default value ? NSUInteger myInteger; // default value ? Some more examples here : //myClass.m // myArray is not initialized, only declared in .h file if ([myArray count] == 0) { // TRUE or FALSE ? // do whatever } More generally, what is returned when I do : [myObjectOnlyDeclaredAndNotInitialized myCustomFunction]; Thank you for your answers. Gotye.

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  • Problem with assigning elements of a class array to individual variables in MATLAB

    - by Marc
    This is a bit of a duplicate of this question, this question, and this question, however those solutions don't work, so I'm asking mine. I've got an array of locally defined classes and I'd like to assign it to multiple, individual variables. This pattern doesn't work: %a is 2x1 of MyClass temp = mat2cell(a); [x,y] = temp{:}; %throws: ??? Insufficient number of outputs from right hand side of equal sign to satisfy assignment. Because temp is a single cell, with my 2x1 array in one cell, rather than a 2x1 cell array with one element of each of my original array in one cell. Any ideas?

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  • Dynamic Variables Within Functions

    - by Ryan
    Why does this work: function myfunction($v) { $query = $v['host'] == '1'; return ( $query ); } $output = array_filter($recordset,myfunction); print_r($output); Whereas this script, which tries to accomplish the same thing with variables, does not? $column1 = 'host'; $value1 = 1; $query1 = '$v[\''.$column1.'\'] == '.$value1; function myfunction($v) { $query = $GLOBALS['query1']; return ( $query ); } $output = array_filter($recordset,myfunction); print_r($output); Any help would be great. Thanks!

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  • GNU make variables in Makefile

    - by JTom
    Hi, I would like to create a Makefile which also creates a simple script for running the compiled application. I have something like the following: @touch $(SCRIPT) @echo LD_LIBRARY_PATH=$(LIB_DIR) $(APP_DIR)/$(APP) $1 $2 $3 $4 $5 $6 > $(SCRIPT) @chmod +x $(SCRIPT) @echo Script successfully created. And I want $1 $2 ... to appear in the script exactly like $1 $2 ... to represent scripts command-line arguments. I can't get it worked because Makefile is using $1 $2 as its own variables.. How can I accomplish that?

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