Hello everyone. I need to set up a job/message queue with the option to set a delay for the task so that it's not picked up immediately by a free worker, but after a certain time (can vary from task to task). I looked into a couple of linux queue solutions (rabbitmq, gearman, memcacheq), but none of them seem to offer this feature out of...
There are many activities on an application that need things like: Send email, Post to twitter thumbnail an image, into several sizes call a cron to find connected relationships A good way to do these tasks is to write into an asynchronous queue on which operations are performed. What django application can be used to implement such...
Under what conditions would one favor apps talking via a message queue instead of via web services (I just mean XML or JSON or YAML or whatever over HTTP here, not any particular type)? I have to talk between two apps on a local network. One will be a web app and have to request commands on another app (running on different hardware). T...
What problem do MOM (Message Oriented Middleware) solve? Scalability? Integration? In which domain are they typically used and in which domains are they typically not used? For example, say, is Google using such solution for it's main search engine or to power GMail? What about big websites like Walmart, eBay, FedEx (pretty much a Jav...
I open a mesage queue in a .c file, and upon success it says the message queue id is 3. While that program is still running, in another terminal I start another program (of another .c file), that creates a new message queue with a different mqd_t. But its id also appears as 3. Is this a problem? server file goes like this: void server(...
When ever IVideoWindow::put_Visible() is invoked, it peek a message from the message queue and dispatch it. That totally messes up the call sequence. I have fixed several crashes caused by this, in a case by case bias. That is, to set a flag before invoking put_Visible() and then clean the flag. And in an event-handler, check the flag f...
One of the characteristics I love most about Google's Task Queue is its simplicity. More specifically, I love that it takes a URL and some parameters and then posts to that URL when the task queue is ready to execute the task. This structure means that the tasks are always executing the most current version of the code. Conversely, my ...
I am not able to create a Queue connection in JBOSS4.2.3GA Version & Java1.5, as I am using MDB as per the below details. I am putting this MDB in a jar file(named utsJar.jar) and copied it in deploy folder of JBOSS, In the test env. this MDB works well but in another env. [ env settings and jboss/java ver is same ] it is throwing erro...
I've been reading up on message queueing lately, and I'd like to implement a simple, extendable, system for my app. While there's a lot of good information on the subject of setting up a MQ system out there, I can't find a lot about the actual implementation. I'm looking for patterns and best practices on how to properly format messages...
I am considering using SQLite as a "job queue container", and was wondering how I could do so, using custom C# (with ADO.NET) to work the database. If this was SQL Server, I would setup a serializable transaction to make sure the parent row and child rows were exclusively mine until I was done. I'm not sure how that would work in SQLite...
What are all the differences between pipes and message queues? Please explain both from vxworks & unix perspectives. I think pipes are unidirectional but message queues aren't. But don't pipes internally use message queues, then how come pipes are unidirectional but message queues are not? What are the other differences you can think...
Hello everyone I'm trying to work with jboss messaging, does anyone knows the default value for these java.naming.security.principal and java.naming.security.credentials or how can I set them? <bean id="jndiTemplate" class="org.springframework.jndi.JndiTemplate"> <property name="environment"> <props> <prop key="jav...
I'm building an SMS call and response system in a new app that receives a message via an aggregator gateway, checks it for functional keywords (run, stop, ask, etc), then processes it appropriately (save to the database, return an answer, or execute a task based on the users authorization). It's running fine at the moment as there are on...
Hello all. I have a simple Delphi program that I'm working on, in which I am attempting to use threading to separate the functionality of the program from its GUI, and to keep the GUI responsive during more lengthy tasks, etc. Basically, I have a 'controller' TThread, and a 'view' TForm. The view knows the controller's handle, which i...
A part of the application I'm working on is an swf that shows a test with some 80 questions. Each question is saved in SQL Server through WebORB and ASP.NET. If a candidate finishes the test, the session needs to be validated. The problem is that sometimes 350 candidates finish their test at the same moment, and the CPU on the web serv...
Hi all, I'm looking for the right messaging system for my needs. Can you help me ? For now, there won't be a huge amount of data to process, but I don't want to be limited later ... The machines are not just web servers, so the messaging tool should be lightweight, even if processing is not very speed. When some data change on a serve...
I'm currently outlining the architecture of an SMS messaging integration for a customer. The service will expose an external (Internet facing) interface for receiving messages (which will be used by a third-party service provider) and an internal interface for sending SMS messages. My current idea is to have a WCF application hosted by ...
Using PHP, I have a query that goes through my DB looking for pending tasks with reminder triggers at certain times of the day. I have a cronjob that runs every 10 mins and checks the DB for any rows that has "remind_me" field set to go off within the next 10 mins. If it does find something, what's the best way to queue an email with the...
Hi, I needed to include in my project but there is a line, in glut.h which is #pragma message("Note: including lib: glut32.lib\n") It is really annoying and I want to get rid of it when compiling. I could just remove the line in my glut.h but I want my fix to be independent of the glut.h. I have tried setting #pragma warnings to sho...
I am writing a c# windows service which will be polling an SFTP folder for new files (one file = one job) and processing them. Multiple instances of the service may be running at the same time, so it is important that they do not step on each other. I realize that an SFTP folder does not make an ideal queue, but that's what I have to wo...