Package javax.jms

Examples of javax.jms.QueueReceiver.receiveNoWait()

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      //To implement receiveNoWait otherwise would be very costly
      //Also other messaging systems e.g. Sun implement it this way

      Thread.sleep(1000);

      Message message = receiver.receiveNoWait();
      int messagecounter=0;

      while( message != null )
      {
         message = receiver.receiveNoWait();
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      Message message = receiver.receiveNoWait();
      int messagecounter=0;

      while( message != null )
      {
         message = receiver.receiveNoWait();
         messagecounter++;
      }

      if ( messagecounter != 20 )
      {
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      session.recover();

      // See previous note on sleep
      Thread.sleep(1000);

      message = receiver.receiveNoWait();
      messagecounter=0;

      while( message != null )
      {
         if ( !message.getJMSRedelivered() )
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            throw new Exception ( "Message was not marked as redelivered! messagecounter=" + messagecounter );
         }

         message.acknowledge();
         messagecounter++;
         message = receiver.receiveNoWait();
      }

      if ( messagecounter != 20 )
      {
         throw new Exception ( "Not all unacknowledged messages were redelivered! messagecounter=" + messagecounter );
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         message = session.createTextMessage("OK");
         sender.send(message);

         // Try to receive the message the not expired message
         queueConnection.start();
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
         assertTrue("Didn't expect anymore messages", receiver.receiveNoWait() == null);
      }
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         queueConnection.start();
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
         assertTrue("Didn't expect anymore messages", receiver.receiveNoWait() == null);
      }
      finally
      {
         disconnect();
      }
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         message = session.createTextMessage("OK");
         sender.send(message);
         // Sleep 6 seconds
         Thread.sleep(6*1000);
         // Try to receive the OK message
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
         assertTrue("Didn't expect anymore messages", receiver.receiveNoWait() == null);

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         // Try to receive the OK message
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
         assertTrue("Didn't expect anymore messages", receiver.receiveNoWait() == null);

         // Send a message that expires in 10 seconds
         message = session.createTextMessage("10 Second Expiration");
         sender.send(message, DeliveryMode.PERSISTENT, 4, 10*1000);
         // Send a message that has not expired
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         message = session.createTextMessage("OK");
         sender.send(message);
         // Sleep 1 seconds
         Thread.sleep(1*1000);
         // Try to receive the messages
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("10 Second Expiration", message.getText());
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
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         // Sleep 1 seconds
         Thread.sleep(1*1000);
         // Try to receive the messages
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("10 Second Expiration", message.getText());
         message = (TextMessage) receiver.receiveNoWait();
         assertEquals("OK", message.getText());

         // Should be no more
         assertTrue("Didn't expect anymore messages", receiver.receiveNoWait() == null);
        
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