Examples of org.jgroups.protocols.UNICAST

org.jgroups.protocols.UNICAST
Reliable unicast layer. Uses acknowledgement scheme similar to TCP to provide lossless transmission of unicast messages (for reliable multicast see NAKACK layer). When a message is sent to a peer for the first time, we add the pair to the hashtable (peer address is the key). All messages sent to that peer will be added to hashtable.peer_addr.sent_msgs. When we receive a message from a peer for the first time, another entry will be created and added to the hashtable (unless already existing). Msgs will then be added to hashtable.peer_addr.received_msgs.
This layer is used to reliably transmit point-to-point messages, that is, either messages sent to a single receiver (vs. messages multicast to a group) or for example replies to a multicast message. The sender uses an AckSenderWindow which retransmits messages for which it hasn't received an ACK, the receiver uses AckReceiverWindow which keeps track of the lowest seqno received so far, and keeps messages in order.
Messages in both AckSenderWindows and AckReceiverWindows will be removed. A message will be removed from AckSenderWindow when an ACK has been received for it and messages will be removed from AckReceiverWindow whenever a message is received: the new message is added and then we try to remove as many messages as possible (until we stop at a gap, or there are no more messages). @author Bela Ban

    }


    @DataProvider
    public static Object[][] configProvider() {
        Object[][] retval=new Object[][] {
                {new UNICAST()},
                {new UNICAST2()}
        };


        ((UNICAST)retval[0][0]).setTimeout(new long[]{500,1000,2000,3000});
        ((UNICAST2)retval[1][0]).setTimeout(new long[]{500,1000,2000,3000});

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        s.stop();
    }




    public void testReceptionOfAllMessages() throws Throwable {
        UNICAST unicast=new UNICAST();
        Properties props=new Properties();
        props.setProperty("timeout", "500,1000,2000,3000");
        unicast.setProperties(props);
        Protocol[] stack=new Protocol[]{unicast};
        createStack(stack);
        _testReceptionOfAllMessages();
    }

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        _testReceptionOfAllMessages();
    }




    public void testReceptionOfAllMessagesWithDISCARD() throws Throwable {
        UNICAST unicast=new UNICAST();
        Properties props=new Properties();
        props.setProperty("timeout", "500,1000,2000,3000");
        unicast.setProperties(props);


        DISCARD discard=new DISCARD();
        props.clear();
        props.setProperty("down", "0.1"); // discard all down message with 10% probability
        discard.setProperties(props);

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            simulator.stop();
    }




    public void testReceptionOfAllMessages() throws Throwable {
        UNICAST unicast=new UNICAST();
        Properties props=new Properties();
        props.setProperty("timeout", "500,1000,2000,3000");
        unicast.setProperties(props);
        Protocol[] stack=new Protocol[]{unicast};
        createStack(stack);
        _testReceptionOfAllMessages();
    }

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        _testReceptionOfAllMessages();
    }




    public void testReceptionOfAllMessagesWithDISCARD() throws Throwable {
        UNICAST unicast=new UNICAST();
        Properties props=new Properties();
        props.setProperty("timeout", "500,1000,2000,3000");
        unicast.setProperties(props);


        DISCARD discard=new DISCARD();
        props.clear();
        props.setProperty("down", "0.1"); // discard all down message with 10% probability
        discard.setProperties(props);

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    protected void setUp() throws Exception {
        super.setUp();
        channel=new JChannel("udp.xml");
        channel.connect("demo-group");
        UNICAST ucast=(UNICAST)channel.getProtocolStack().findProtocol(UNICAST.class);
        cache=ucast != null? ucast.getAgeOutCache() : null;
        if(cache != null)
            cache.setTimeout(1000);
    }

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Related Classes of org.jgroups.protocols.UNICAST

org.jgroups.stack.AckReceiverWindow

org.jgroups.stack.AckSenderWindow

org.jgroups.stack.StaticInterval

org.jgroups.tests.UNICAST_Test

org.jgroups.tests.UnicastEnableToTest

java.util.concurrent.locks.ReentrantLock

java.util.concurrent.atomic.AtomicBoolean

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