message-queue

I have a simple RabbitMQ test program randomly enqueuing messages, and another reading them, all using Spring-AMQP. If the consumer dies (for example killing a process without having a chance to close its connection or channel), any messages that it had not acknowledged appear to remain unacknowledged forever. I have seen a number of references (for example this question ) that say that the channel dies when it has no connections, and that remaining unack'd messages will be redelivered. That's not the behaviour I see - instead I get a growing list of channels marked IDLE and a growing list of

I just got up and running with Kafka 0.8 beta 1. I have a really simple example up and running, the problem is, I can only get one message consumer to work, not several. That is, the runSingleWorker() method WORKS. The run() method DOES NOT WORK: import kafka.consumer.ConsumerIterator; import kafka.consumer.KafkaStream; import kafka.consumer.ConsumerConfig; import kafka.javaapi.consumer.ConsumerConnector; import java.util.Map; import java.util.List; import java.util.HashMap; import java.util.concurrent.Executors; import java.util.concurrent.ExecutorService; import org.springframework.context

I thought I'd use Boost.Interprocess's Message Queue in place of sockets for communication within one host. But after digging into it, it seems that this library for some reason eschews the POSIX message queue facility (which my Linux system supports), and instead is implemented on top of POSIX shared memory. The interface is similar enough that you might not guess this right away, but it seems to be the case. The downside for me is that shared memory obtained via shm_open(3) does not appear to be usable with select(2) , as opposed to POSIX message queues obtained via mq_open(3) . It seems

As a exercise I'm trying to find an example which implements competing consumer. many producers - > MSMQueue <- competing consumers So far I did not find any documentation on how to achieve this. My first attempt to figure out how is implemented in MassTransit or NServiceBus failed to many layers of indirection. Any help will be greatly appreciated. Cocowalla With MassTransit and MSMQ you can achieve this using the Distributor component. Note that if you use MassTransit with RabbitMQ instead of MSMQ, you can implement a competing consumer scenario without using the Distributor, simply by

What is the best way to go over a JMS queue and get all the messages in it? How can count the number of messages in a queue? Thanks. Using JmsTemplate public int getMessageCount(String messageSelector) { return jmsTemplate.browseSelected(messageSelector, new BrowserCallback<Integer>() { @Override public Integer doInJms(Session s, QueueBrowser qb) throws JMSException { return Collections.list(qb.getEnumeration()).size(); } }); } sunleo This is how you can count No of Messages in a Queue public static void main(String[] args) throws Exception { // get the initial context InitialContext ctx = new