Examples of org.jgroups.protocols.DISCARD$DiscardHeader

org.jgroups.protocols.DISCARD
Discards up or down messages based on a percentage; e.g., setting property 'up' to 0.1 causes 10% of all up messages to be discarded. Setting 'down' or 'up' to 0 causes no loss, whereas 1 discards all messages (not very useful).

   }


   private void killChannel(CacheSPI cacheToKill, CacheSPI anotherCache, int finalExpectedClusterSize)
   {
      JChannel channel = (JChannel) cacheToKill.getRPCManager().getChannel();
      DISCARD discard = (DISCARD) channel.getProtocolStack().findProtocol(DISCARD.class);
      if (discard != null)
      {
         discard.setDiscardAll(true);
         TestingUtil.blockUntilViewReceived(anotherCache, finalExpectedClusterSize, 10000, false);
         // an extra second, for some reason we need this.
         TestingUtil.sleepThread(1000);
      }
   }

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   private static void crashCacheManagers(EmbeddedCacheManager... cacheManagers) {
      for (EmbeddedCacheManager cm : cacheManagers) {
         JGroupsTransport t = (JGroupsTransport) cm.getGlobalComponentRegistry().getComponent(Transport.class);
         Channel channel = t.getChannel();
         try {
            DISCARD discard = new DISCARD();
            discard.setDiscardAll(true);
            channel.getProtocolStack().insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
         } catch (Exception e) {
            log.warn("Problems inserting discard", e);
            throw new RuntimeException(e);
         }

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               if (c.getAddress().equals(a)) inThisPartition = true;
            }
            if (!inThisPartition) outsideMembers.add(a);
         }
         for (Channel c : channels) {
            DISCARD discard = new DISCARD();
            for (Address a : outsideMembers) discard.addIgnoreMember(a);
            try {
               c.getProtocolStack().insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
            } catch (Exception e) {
               throw new RuntimeException(e);
            }

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   public static DISCARD getDiscardForCache(Cache<?, ?> c) throws Exception {
      JGroupsTransport jgt = (JGroupsTransport) TestingUtil.extractComponent(c, Transport.class);
      Channel ch = jgt.getChannel();
      ProtocolStack ps = ch.getProtocolStack();
      DISCARD discard = new DISCARD();
      ps.insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
      return discard;
   }

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            fork(new Callable<Void>() {
               @Override
               public Void call() throws Exception {
                  log.info("KILLING the c1 cache");
                  try {
                     DISCARD d3 = TestingUtil.getDiscardForCache(c1);
                     d3.setDiscardAll(true);
                     d3.setExcludeItself(true);
                     TestingUtil.killCacheManagers(manager(c1));
                  } catch (Exception e) {
                     log.info("there was some exception while killing cache");
                  }
                  return null;

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   public static DISCARD getDiscardForCache(Cache<?, ?> c) throws Exception {
      JGroupsTransport jgt = (JGroupsTransport) TestingUtil.extractComponent(c, Transport.class);
      Channel ch = jgt.getChannel();
      ProtocolStack ps = ch.getProtocolStack();
      DISCARD discard = new DISCARD();
      ps.insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
      return discard;
   }

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        super.tearDown();
    }




    public void testLastMessageDropped() throws Exception {
        DISCARD discard=new DISCARD();
        ProtocolStack stack=c1.getProtocolStack();
        stack.insertProtocol(discard, ProtocolStack.BELOW, NAKACK.class);
        c1.setOpt(Channel.LOCAL, false);


        Message m1=new Message(null, null, 1);
        Message m2=new Message(null, null, 2);
        Message m3=new Message(null, null, 3);


        MyReceiver receiver=new MyReceiver();
        c2.setReceiver(receiver);
        c1.send(m1);
        c1.send(m2);
        discard.setDropDownMulticasts(1); // drop the next multicast
        c1.send(m3);
        Util.sleep(100);


        List<Integer> list=receiver.getMsgs();
        for(int i=0; i < 10; i++)  {

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    /**
     * Tests sending 1, 2 (OOB) and 3, where they are received in the order 1, 3, 2. Message 3 should not get delivered
     * until message 4 is received (http://jira.jboss.com/jira/browse/JGRP-780)
     */
    public void testRegularAndOOBUnicasts() throws Exception {
        DISCARD discard=new DISCARD();
        ProtocolStack stack=c1.getProtocolStack();
        stack.insertProtocol(discard, ProtocolStack.BELOW, UNICAST.class);


        Address dest=c2.getLocalAddress();
        Message m1=new Message(dest, null, 1);
        Message m2=new Message(dest, null, 2);
        m2.setFlag(Message.OOB);
        Message m3=new Message(dest, null, 3);


        MyReceiver receiver=new MyReceiver();
        c2.setReceiver(receiver);
        c1.send(m1);
        discard.setDropDownUnicasts(1);
        c1.send(m2);
        c1.send(m3);


        Util.sleep(500); // time for potential retransmission
        List<Integer> list=receiver.getMsgs();

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        assertEquals("list is " + list, 3, list.size());
        assertTrue(list.contains(1) && list.contains(2) && list.contains(3));
    }
    
    public void testRegularAndOOBUnicasts2() throws Exception {
        DISCARD discard=new DISCARD();
        ProtocolStack stack=c1.getProtocolStack();
        stack.insertProtocol(discard, ProtocolStack.BELOW, UNICAST.class);


        Address dest=c2.getLocalAddress();
        Message m1=new Message(dest, null, 1);
        Message m2=new Message(dest, null, 2);
        m2.setFlag(Message.OOB);
        Message m3=new Message(dest, null, 3);
        m3.setFlag(Message.OOB);
        Message m4=new Message(dest, null, 4);


        MyReceiver receiver=new MyReceiver();
        c2.setReceiver(receiver);
        c1.send(m1);


        discard.setDropDownUnicasts(1);
        c1.send(m3);


        discard.setDropDownUnicasts(1);
        c1.send(m2);
        
        c1.send(m4);


        Util.sleep(1000); // time for potential retransmission

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        assertSame("list is " + list, list.size(), 4);
        assertTrue(list.contains(1) && list.contains(2) && list.contains(3) && list.contains(4));
    }


    public void testRegularAndOOBMulticasts() throws Exception {
        DISCARD discard=new DISCARD();
        ProtocolStack stack=c1.getProtocolStack();
        stack.insertProtocol(discard, ProtocolStack.BELOW, NAKACK.class);
        c1.setOpt(Channel.LOCAL, false);


        Address dest=null; // send to all
        Message m1=new Message(dest, null, 1);
        Message m2=new Message(dest, null, 2);
        m2.setFlag(Message.OOB);
        Message m3=new Message(dest, null, 3);


        MyReceiver receiver=new MyReceiver();
        c2.setReceiver(receiver);
        c1.send(m1);
        discard.setDropDownMulticasts(1);
        c1.send(m2);
        c1.send(m3);


        Util.sleep(1000); // time for potential retransmission
        List<Integer> list=receiver.getMsgs();

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