There is something I don't understand:
In here
http://incubator.apache.org/activemq/what-happens-with-a-fast-producer-and-slow-consumer.html
http://incubator.apache.org/activemq/what-happens-with-a-fast-producer-and-slow-consumer.html
they are saing that a slow consumer will cause the producer to slow down
also, but if there is no "built-in" limitation on the queue size/capacity,
then how can it be done? What will stop the queue from growing to (almost)
infinity?
Eichberger, German wrote:
>
> We solved this by asking the queue every time before we inserted
> something how many message are there, e.g. in your producer do the
> following:
>
> public static synchronized void initJMX(long port) {
> try {
> JMXServiceURL url = new
> JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:"+port+"/jmxrmi")
> ;
> JMXConnector conn =
> JMXConnectorFactory.connect(url);
> mbs = conn.getMBeanServerConnection();
> } catch (Exception e) {
> log.error("Exception obtaining #messages in queue:" +
> e.getMessage());
> }
>
>
> }
>
> public long getQueueSize(ActiveMQQueue destination) throws
> Exception{
> try {
> String name = "org.apache.activemq" +
> ":Type=Queue,Destination=" +
> destination.getQueueName() + ",BrokerName=localhost";
>
> ObjectName queueViewMBeanName = new ObjectName(name);
>
> if (mbs.isRegistered(queueViewMBeanName)) {
>
> QueueViewMBean queue = (QueueViewMBean)
> MBeanServerInvocationHandler.newProxyInstance(mbs, queueViewMBeanName,
> QueueViewMBean.class, true);
>
>
> long size = queue.getQueueSize();
> log.info("Queue: " + queueViewMBeanName + " now has: " +
> size + " message(s)");
> return size;
> } else {
> log.error("Bean not registered");
> throw new Exception("Bean not registered");
> }
> } catch (Exception e) {
> log.error("Exception obtaining #messages in queue:" +
> e.getMessage());
> throw new Exception(e);
> }
> }
>
> Then you call the function in the produicer and decide if you can send
> the message...
>
> You also need to enable JMX on your JVM.
>
> German
>
>
>
> -----Original Message-----
> From: itayke [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, January 30, 2007 4:49 AM
> To: [email protected]
> Subject: How to limit a queue capacity
>
>
> Hi,
>
> I like to limit the capacity of a queue (lets say to maximum of 5
> messages).
>
> 1. How is it done?
> 2. what shall happen to a producer that will try to send the 6th message
> to
> this queue?
>
> Thanks
> --
> View this message in context:
> http://www.nabble.com/How-to-limit-a-queue-capacity-tf3142214.html#a8708
> 859
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>
>
>
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