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  • What is the right way to implement communication between java objects?

    - by imoschak
    I'm working on an academic project which simulates a rather large queuing procedure in java. The core of the simulator rests within one package where there exist 8 classes, each one implementing a single concept. Every class in the project follows SRP. These classes encapsulate the behavior of the simulator and inter-connect every other class in the project. The problem that has arisen is that most of these 8 classes are, as is logical i think, tightly coupled and each one has to have working knowledge of every other class in this package in order to be able to call methods from it when needed. The application needs only one instance of each class so it might be better to create static fields for each class in a new class and use that to make calls -instead of preserving a reference in each class for every other class in the package (which I'm certain that is incorrect)-, but is this considered a correct design solution? or is there a design pattern maybe that better suits my needs?

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  • Why do apps from Android 2.1 stop working with 2.2?

    - by poeschlorn
    Hi guys, I've just updated my nexus one to 2.2. Now all of my (own and some from the market) apps throw exceptions and were closed. It's weird, in the app I'm developing atm, there it displays only my start page with buttons, but when I tap on one button to fire an intent to another activity my app gets closed with an exception. Yesterday before the update everything worked fine. The same thing in my emulator: I have two devices, one with API level 7 and one with level 8. Level 7 worked fine, but level 8 killed my app :( What is the problem and how can I solve this? I'm desperatly trying to get it working again :( I hope someone can help me fixing this

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  • Why are these methods public?

    - by Blankman
    My javascript looks like the following. I don't understand why these methods are all public though? Something.RegisterNamespace("One.ABC"); (function(ABC) { ABC.SayHello = function() { alert('hello'); }; })(One.ABC); So now I can do: One.ABC.SayHello();

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  • Java generic function for performing calculations on integer, on double?

    - by Daniel
    Is this possible? Surely if you passed in a double, any sort of function implementation code which casts an object to an Integer would not be able to work unless the cast 'Integer' was specifically used? I have a function like: public static void increment(Object o){ Integer one = (Integer)o; system.out.println(one++); } I cant see how this could be made generic for a double? I tried public static <E> void increment(E obj){ E one = (E)o; system.out.println(one++); } but it didn't like it?

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  • is it possible to create a multi-project template that references n number of existing projects and

    - by jcollum
    The situation: I need to create about 40+ solutions that all reference 3 projects and have one project that is unique to each one. I'd like to create a multi-project template that does this, but from what I've read it looks like it's very difficult or impossible (related SO question, but doesn't answer). I want my solution to look like this (names changed of course): These three are used by all solutions created under this "family": MyCompany.Extensions MyCompany.MyProject.Tests.Shared MyCompany.MyProject.Scripts This one is the one that makes the solution unique, 123, 124, 125 etc: MyCompany.MyProject.Tests.Unit123 Is it possible to set up a multi-project template that will generate this structure? References: MSDN Create Multi Project Templates

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  • Java iterative vs recursive

    - by user1389813
    Can anyone explain why the following recursive method is faster than the iterative one (Both are doing it string concatenation) ? Isn't the iterative approach suppose to beat up the recursive one ? plus each recursive call adds a new layer on top of the stack which can be very space inefficient. private static void string_concat(StringBuilder sb, int count){ if(count >= 9999) return; string_concat(sb.append(count), count+1); } public static void main(String [] arg){ long s = System.currentTimeMillis(); StringBuilder sb = new StringBuilder(); for(int i = 0; i < 9999; i++){ sb.append(i); } System.out.println(System.currentTimeMillis()-s); s = System.currentTimeMillis(); string_concat(new StringBuilder(),0); System.out.println(System.currentTimeMillis()-s); } I ran the program multiple time, and the recursive one always ends up 3-4 times faster than the iterative one. What could be the main reason there that is causing the iterative one slower ?

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  • Ways to prevent multiple email notification with php&mysql

    - by Louis Loudog Trottier
    My 1st post, but i got many great answers and tips from stackoverflow so far. This one was a close call- How does facebook, gmail send the real time notification? but not exactly, so let brainstorm this together. I have CMS system with mail notification when a change is made on the site. Everything wotk very well but i want to prevent multiple notification if somene make another quick change to, let say, fix a typo. Using php mail(), obviously. I've tough of 2 ways, one simple, and one.... let just say, pretty heavy... cough. the 3rd one was inspired by Implementing Email Notification but really doesn't look appealing to me to send bunch of email at once. Use a timestamp to check if another change was made in the 'let say' last 5 minutes. Record the last change, and compare it to the new one. Could be usefull for backup at the same time since i'll have to save the change somewhere, but text can be long and making an sql search would be painfull. Wouldn't it? Use cron to send changes every x minutes... convince me if you ythink it is a suitable solution. Any ideas, comment or suggestion of your own? Looking forward for your inputs, and since i now registered, i'll do my best to help around. Cheers, all llt

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  • Runtime Error: "Out of Memory" From Excel Macro

    - by user356180
    I have one macro, which is called when a cell change occurs. This macro selects images, deletes them, and inserts another image depending on a cell value using the following code. I have the same code for two sheets. Private Sub Worksheet_SelectionChange(ByVal Target As Range) ActiveSheet.Shapes.SelectAll Selection.Delete 'insert image code here. End Sub In one sheet, it's working perfectly fine and deletes all images, while in the other sheet, it gives me the runtime error "Out of Memory" and highlights the following line: ActiveSheet.Shapes.SelectAll Can anyone tell me why this is happening? It works perfectly fine in one and not in the other. One other thing I want to tell you is it was working fine when I gave this Excel macro to my client; both sheets were working fine. Suddenly after 2 days, he started getting the error on one sheet on which he was working a lot. I don't know why this is happening. Can anyone tell me what's the reason for this and how I can solve it?

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  • why i change the alpha value of UIImageView but no effect?

    - by chancy
    I am working on a reader app. when you read one magazine, it will display first five pages and download the rest pages one by one. there is a scrollview to view the thumbnail image of pages. At the beginning, if the page needs downloading, the corresponding thumbnail view's alpha value is set to 0.5. when the page is downloaded, i will update the thumbnail view's value to 1.0. I use one operation to download the page, and when one is downloaded i use delegate to set thumbnail view's alpha. But when i update thumbnail view's alpha value, it still the same as the beginning. it seems the alpha has no effect. I wonder is there anything wrong with my code? some snippets are as follows: In the PageViewController.m - (void)downloadPages { DownloadOperation *op = [[DownloadOperation alloc] initWithMagazine:magazine]; op.delegate = self; [[(AppDelegate *)[[UIApplication sharedApplication] delegate] sharedOperationQueue] addOperation:op]; } - (void)downloadOperation:(DownloadOperation *)operation finishedAtIndex:(NSUInteger)index { if (thumbScrollView){ [thumbScrollView viewWithTag:THUMBVIEW_OFFSET+index].alpha = 1.0; } } In DownloadOperation.m - (void)main { // ... NSUInteger index = 0; for (Page *page in mMagazine.pages) { if (/*page doesn't exist*/){ // download the page; if ([delegate respondsToSelector:@selector(downloadOperation:finishedAtIndex:)]) { [delegate downloadOperation:self finishedAtIndex:index]; } } index++; } }

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  • UIView viewWithTag 0 problem

    - by leon
    Hi, On view in IB I have numerous items (including view itself). ONLY one item has tag 0, yet following line works for ANY UITextBox other then the one with tag 0. Note that only ONE UITextBox has tag 0, why: (UITextField *) [self.view viewWithTag:0]).text = @"foo"; Interesting that when triggered event received for the element with tag 0, I can get value of Tag 0 with no problem. Is there a limitation to look for tag 0 elements?

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  • RegisterClientScriptInclude

    - by mrf
    i use ScriptManager.RegisterClientScriptInclude to include js file after partial postback it works fine here : ** ScriptManager.RegisterClientScriptInclude(this, typeof(test4), "1", Page.ResolveClientUrl("~/slideshow/js/slideshow.js")); ** but i want to load more than one js files so i did this ** ScriptManager.RegisterClientScriptInclude(this,typeof(test4),"one", Page.ResolveClientUrl("~/slideshow/js/slideshow.js")); ScriptManager.RegisterClientScriptInclude(this, typeof(test4), "two", Page.ResolveClientUrl("~/slideshow/js/slideImg.js")); ** with two different string keys the first one works but the second not....please any help

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  • Loading multiple embedded flash apps onto an HTML page- problem with ordering

    - by shudson250
    We need to load an embedded version of a site written in Flash, and not originally designed to load multiple instances of itself, on a HTML page. The specific issue is how to get them to load in order when embedded, given that they are all being opened by the same instance of the flash player. It's a complicated mapping application, and at the moment, the maps and data get intermixed as the session variables are overwritten by another instance starting to load before the previous one has finished. We need a way to have them load sequentially, one finishing before another starts to load. The most we can specify in the URL is an &order=1 or similar. We have PHP and SQL on the backend. Edit: The embedded versions are being loaded in an iFrame of a parent site. One php file loads one swf, as many times as the parent site desires.

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  • Why is i++++++++i valid in python?

    - by SysAdmin
    I "accidentally" came across this weird but valid syntax i=3 print i+++i #outputs 6 print i+++++i #outputs 6 print i+-+i #outputs 0 print i+--+i #outputs 6 (for every even no: of minus symbol, it outputs 6 else 0, why?) Does this do anything useful? Update (Don't take it the wrong way..I love python): One of Python's principle says There should be one-- and preferably only one --obvious way to do it. It seems there are infinite ways to do i+1

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  • Stream buffering issue

    - by Kolyunya
    The mod_rewrite documentation states that it is a strict requirement to disable in(out)put buffering in a rewrite program. Keeping that in mind I've written a simple program (I do know that it lacks the EOF check but this is not an issue and it saves one condition check per loop): #include <stdio.h> #include <stdlib.h> int main ( void ) { setvbuf(stdin,NULL,_IOLBF,4200); setvbuf(stdout,NULL,_IOLBF,4200); int character; while ( 42 ) { character = getchar(); if ( character == '-' ) { character = '_'; } putchar(character); } return 42 - 42; } After making some measurements I was shocked - it was over 9,000 times slower than the demo Perl script provided by the documentation: #!/usr/bin/perl $| = 1; # Turn off I/O buffering while (<STDIN>) { s/-/_/g; # Replace dashes with underscores print $_; } Now I have two related questions: Question 1. I believe that the streams may be line buffered since Apache sends a new line after each path. Am I correct? Switching my program to setvbuf(stdin,NULL,_IOLBF,4200); setvbuf(stdout,NULL,_IOLBF,4200); makes it twice as fast as Perl one. This should not hit Apache's performance, should it? Question 2. How can one write a program in C which will use unbuffered streams (like Perl one) and will perform as fast as Perl one?

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  • SSIS Data Transformation

    - by bbbbb
    Hi, I am new to SSIS, so please bare with me. I am trying to transfer data from one db to a new one. i am fetching data from one table say i fetch name of person, then i insert this into say Table Person. this will generate a personID which i want to insert into say Address Table. What should be the approach using SSIS. Any suggestions.

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  • Pi help with Php (mass looping)

    - by Pieman
    My primary question is: Is this alot of loops? while ($decimals < 50000 and $remainder != "0") { $number = floor($remainder/$currentdivider); //Always round down! 10/3 =3, 10/7 = 1 $remainder = $remainder%$currentdivider; // 10%3 =1, 10%1 $thisnumber = $thisnumber . $number; $remainder = $remainder . 0; //10 $decimals += 1; } Or could I fit more into it? -without the server crashing/lagging. I'm just wondering, Also is there a more effiecent way of doing the above? (e.g. finidng out that 1/3 = 0.3 to 50,000 decimals.) Finally: I'm doing this for a pi formulae the (1 - 1/3 + 1/5 - 1/7 etc.) one, And i'm wondering if there is a better one. (In php) I have found one that finds pi to 2000 in 4 seconds. But thats not what I want. I want an infinite series that converges closer to Pi so every refresh, users can view it getting closer... see: http://zombiewrath.com/pi.php (Old one) and 'zombiewrath.com/superpi.php' (Newer one) But obv. converging using the above formulae takes ALONG time. Is there any other 'loop' like Pi formulaes (workable in php) that converge faster? Thanks alot...

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  • Should an edit of a comment be sent through POST or PUT?

    - by the_drow
    I have the following URI: Posts/{postId}/Comments/{commentId} I would like to enable users to edit a comment through my API, should the edit be done with POST or PUT? One one hand, POST updates the contents of a resource so that makes sense but on the other hand PUT replaces it with a new one. So if I understand correctly with POST I need to send only what needs to be updates and with PUT I send the whole resource. Usually in edit forms, the whole resource is loaded anyway so what's the point of using POST? If I take one approach or the other, what are the differences?

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  • How to Use Multi Spinner to Store Each Table from Database

    - by stephenborey
    Dear Sir, I'm having problem in the method how to add each of the database table to many spinners. The data from one table must use one spinner to store. In my form has 3 spinner which require data from 3 table in database. Please show me some sample or the familiar one, because I have just started in this program. Thank You in Advance!

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