message-queue

This bug baffled me for hours. I am getting the NullPointerException . The problem is this error is not consistent. It happens when I launch the app, but only occasionally. So I am not sure what is causing it. I apologize for the verbose question with the error log, but I could not find another way of asking. The error log is as follows: FATAL EXCEPTION: main Process: com.myproject.android, PID: 22175 java.lang.NullPointerException at com.myproject.android.ImageDownloaderThread.queueImage(ImageDownloaderThread.java:74) at com.myproject.android.NewsItemPagerActivity

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 the box. Any ideas on how I could achieve this? Thanks! I've used BeanstalkD to great effect, using the delay option on inserting a new job to wait several seconds till the item becomes available to be reserved. If you are doing longer-term delays (more than say 30 seconds),

I have this in a class called "MessageQueueReceive". public MessageQueueTransaction BlockingReceive(out Message message) { MessageQueueTransaction tran = null; message = null; tran = new MessageQueueTransaction(); tran.Begin(); try { message = Queue.Receive(new TimeSpan(0, 0, 5), tran); } catch (MessageQueueException ex) { // If the exception was a timeout, then just continue // otherwise re-raise it. if (ex.MessageQueueErrorCode != MessageQueueErrorCode.IOTimeout) throw ex; } return tran; } Then my processing loop has this:- while (!Abort) { try { tran = this.Queue.BlockingReceive(out msg);

I'm trying to wrap my head around the message queue model and jobs that I want to implement in a PHP app: My goal is to offload messages / data that needs to be sent to multiple third party APIs, so accessing them doesnt slow down the client. So sending the data to a message queue is ideal. I considered using just Gearman to hold the MQ/Jobs, but I wanted to use a Cloud Queue service like SQS or Rackspace Cloud Queues so i wouldnt have to manage the messages. Here's a diagram of what I think I should do: Questions: My workers, would be written in PHP they all have to be polling the cloud queue

Is there a way to delete / purge all queues in ActiveMQ via the command line (win/linux)? I could only find the commands for a specific queue. Or maybe there's a way to do this via the activeMQ admin? Again, I only found how to delete/purge the queues one by one, which can be very tedious. Thanks! You can do tweak your activemq.xml a bit: <broker deleteAllMessagesOnStartup="true" ...> This works with KahaDB message stores (it has problems with JDBC message stores), all your messages get deleted and subsequently queues are cleared. As you want all queues to be deleted, restarting the broker won