Examples of org.jboss.messaging.core.impl.DeliveringCounter

org.jboss.messaging.core.impl.DeliveringCounter
A DeliveringCounter: keeps track of delivering count and messages. Because of the asynchronous nature of message delivery and acknowledge, message acknowledgments may come in before corresponding counting increment incurred with message delivery. For example, Message m1 is being delivered to a consumer and then is put to this counter. Normally the ack of m1 comes later and causes the counter to decrement. m1 will be correctly added and removed. However, there is a minor chance that the ack of m1 comes in before it is put into this counter. Therefore when decrement() is called m1 is not there. Later m1 is put into the counter and will never be cleared because it has missed the ack. This would be fine with a pure delivering count (an integer) but not when retrieve messages being delivered. In above case, an acked message m1 will be returned when being asked for even if it has be acked. Also, adding in-processing message retrieval functionality entails more data structure operations for message references tracking, thus bringing extra performance cost. This shouldn't be necessary for users who doesn't need this functionality. So in the implementation, we use three variables: - an AtomicInteger to purely track the delivering count; - an ConcurrentHashMap to hold messages being delivered; - an ConcurrentLinkedQueue to hold messages that are being acknowledged but not yet put in the above map. In addition, a int flag to control the functionality level: - LEVEL_NONE denotes totally disable delivering counter. - LEVEL_COUNTER denotes delivering count only. This is the default level. - LEVEL_ALL denotes full delivering counter functionality. @author Howard GaoCreated Aug 18, 2010 1:27:46 PM

      
   }


   public void testDeliveringCounterNone() throws Exception
   {
      DeliveringCounter counter = new DeliveringCounter(DeliveringCounter.LEVEL_NONE);
      
      assertEquals(DeliveringCounter.LEVEL_NONE, counter.getLevel());
      Message[] mids = new Message[1000];
      for (int i = 0; i < 1000; i++)
      {
         Message m = CoreMessageFactory.createCoreMessage(i);
         counter.increment(m);
         mids[i] = m;
      }
      assertEquals(0, counter.get());
      for (int i = 0; i < 49; i++) {
         counter.decrement(mids[i]);
      }
      assertEquals(0, counter.get());
      counter.reset();
      assertEquals(0, counter.get());
   }

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      assertEquals(0, counter.get());
   }


   public void testDeliveringCounterDefault() throws Exception
   {
      DeliveringCounter counter = new DeliveringCounter();
      
      assertEquals(DeliveringCounter.LEVEL_COUNTER, counter.getLevel());
      Message[] mids = new Message[1000];
      for (int i = 0; i < 1000; i++)
      {
         Message m = CoreMessageFactory.createCoreMessage(i);
         counter.increment(m);
         mids[i] = m;
      }
      assertEquals(1000, counter.get());
      for (int i = 0; i < 49; i++) {
         counter.decrement(mids[i]);
      }
      assertEquals(951, counter.get());
      counter.reset();
      assertEquals(0, counter.get());
   }

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      assertEquals(0, counter.get());
   }


   public void testDeliveringCounterAll() throws Exception
   {
      DeliveringCounter counter = new DeliveringCounter(DeliveringCounter.LEVEL_ALL);
      
      assertEquals(DeliveringCounter.LEVEL_ALL, counter.getLevel());
      Message[] mids = new Message[1000];
      
      Map<Long, Message> msgs = new HashMap<Long, Message>();
      
      for (int i = 0; i < 1000; i++)
      {
         Message m = CoreMessageFactory.createCoreMessage(i);
         msgs.put(m.getMessageID(), m);
         counter.increment(m);
         mids[i] = m;
      }
      assertEquals(1000, counter.get());
      for (int i = 0; i < 49; i++) {
         counter.decrement(mids[i]);
         msgs.remove(mids[i].getMessageID());
      }
      assertEquals(951, counter.get());
      assertEquals(951, counter.getMessages().size());
      
      List inProcMsgs = counter.getMessages();
      for (Object o : inProcMsgs)
      {
         Message msg = (Message)o;
         msgs.remove(msg.getMessageID());
      }
      assertEquals(0, msgs.size());
      
      counter.reset();
      assertEquals(0, counter.get());
      assertEquals(0, counter.getMessages().size());
   }

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    * When those threads finish, the counter should be empty.
    * 
    */
   public void testDeliveringCounterConcurrent() throws Exception
   {
      DeliveringCounter counter = new DeliveringCounter(DeliveringCounter.LEVEL_ALL);
      
      assertEquals(DeliveringCounter.LEVEL_ALL, counter.getLevel());
      final int numMsg = 50000;
      Message[] mids = new Message[numMsg];
      
      final ConcurrentLinkedQueue<Message> msgs1 = new ConcurrentLinkedQueue<Message>();
      final ConcurrentLinkedQueue<Message> msgs2 = new ConcurrentLinkedQueue<Message>();
      
      for (int i = 0; i < numMsg; i++)
      {
         Message m = CoreMessageFactory.createCoreMessage(i);
         msgs1.add(m);
         msgs2.add(m);
      }
      
      final int numThr = 5;
      //create putter threads
      Thread[] putters = new PutterThread[numThr];
      Thread[] takers = new TakerThread[numThr];
      
      for (int i = 0; i < numThr; i++) {
         putters[i] = new PutterThread(counter, msgs1, i);
         takers[i] = new TakerThread(counter, msgs2, i);
         putters[i].start();
         takers[i].start();
      }
      
      for (int i = 0; i < numThr; i++) {
         putters[i].join();
         takers[i].join();
      }


      List msgs = counter.getMessages();
      assertEquals(0, msgs.size());
      assertEquals(0, counter.get());
   }

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Related Classes of org.jboss.messaging.core.impl.DeliveringCounter

org.jboss.messaging.core.contract.Message

org.jboss.test.messaging.core.MessagingQueueTestBase

java.util.concurrent.atomic.AtomicInteger

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