Examples of org.jgroups.Message

org.jgroups.Message
A Message encapsulates data sent to members of a group. It contains among other things the address of the sender, the destination address, a payload (byte buffer) and a list of headers. Headers are added by protocols on the sender side and removed by protocols on the receiver's side.
The byte buffer can point to a reference, and we can subset it using index and length. However, when the message is serialized, we only write the bytes between index and length. @author Bela Ban @version $Id: Message.java,v 1.94 2008/11/11 09:30:08 belaban Exp $

        assert msg.isFlagSet(Message.DONT_BUNDLE);
    }




    public static void testBufferSize() throws Exception {
        Message m1=new Message(null, null, "bela");
        assert m1.getRawBuffer() != null;
        assert m1.getBuffer() != null;
        Assert.assertEquals(m1.getBuffer().length, m1.getLength());
        byte[] new_buf={'m', 'i', 'c', 'h', 'e', 'l', 'l', 'e'};
        m1.setBuffer(new_buf);
        assert m1.getRawBuffer() != null;
        assert m1.getBuffer() != null;
        Assert.assertEquals(new_buf.length, m1.getLength());
        Assert.assertEquals(m1.getBuffer().length, m1.getLength());
    }

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        unicast.down(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
        unicast.setMaxMessageBatchSize(max_msg_batch_size);


        // send the first message manually, to initialize the AckReceiverWindow tables
        Message msg=createMessage(local_addr, sender, 1L, oob, true);
        unicast.up(new Event(Event.MSG, msg));
        Util.sleep(500);




        final CountDownLatch latch=new CountDownLatch(1);

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        }
        System.out.println("OK");
    }


    private static Message createMessage(Address dest, Address src, long seqno, boolean oob, boolean first) {
        Message msg=new Message(dest, src, "hello world");
        UNICAST.UnicastHeader hdr=UNICAST.UnicastHeader.createDataHeader(seqno, (short)1, first);
        msg.putHeader(UNICAST_ID, hdr);
        if(oob)
            msg.setFlag(Message.OOB);
        return msg;
    }

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    }




    public static void testBufferOffset() throws Exception {
        byte[] buf={'b', 'e', 'l', 'a', 'b', 'a', 'n'};
        Message m1=new Message(null, null, buf, 0, 4);
        Message m2=new Message(null, null, buf, 4, 3);


        byte[] b1, b2;


        b1=new byte[m1.getLength()];
        System.arraycopy(m1.getRawBuffer(), m1.getOffset(), b1, 0, m1.getLength());


        b2=new byte[m2.getLength()];
        System.arraycopy(m2.getRawBuffer(), m2.getOffset(), b2, 0, m2.getLength());


        Assert.assertEquals(4, b1.length);
        Assert.assertEquals(3, b2.length);
    }

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    public static void testSetBufferWithNullBuffer() {
        byte[] buf={'b', 'e', 'l', 'a'};
        Message m1=new Message();
        m1.setBuffer(buf, 1, 2); // dummy data with non 0 oiffset and length
        Assert.assertEquals(1, m1.getOffset());
        Assert.assertEquals(2, m1.getLength());


        m1.setBuffer(null, 1, 2); // dummy offset and length, is ignored
        Assert.assertEquals(0, m1.getOffset());
        Assert.assertEquals(0, m1.getLength());
    }

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    @Test(groups=Global.FUNCTIONAL, expectedExceptions=ArrayIndexOutOfBoundsException.class)
    public static void testInvalidOffset() {
        byte[] buf={'b', 'e', 'l', 'a', 'b', 'a', 'n'};
        Message m1=new Message(null, null, buf, -1, 4);
        System.out.println("message is " + m1);
    }

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    }


    @Test(groups=Global.FUNCTIONAL, expectedExceptions=ArrayIndexOutOfBoundsException.class)
    public static void testInvalidLength() {
        byte[] buf={'b', 'e', 'l', 'a', 'b', 'a', 'n'};
        Message m1=new Message(null, null, buf, 3, 6);
        System.out.println("we should not get here with " + m1);
    }

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    }




    public static void testGetRawBuffer() {
        byte[] buf={'b', 'e', 'l', 'a', 'b', 'a', 'n'};
        Message m1=new Message(null, null, buf, 0, 4);
        Message m2=new Message(null, null, buf, 4, 3);


        Assert.assertEquals(buf.length, m1.getRawBuffer().length);
        Assert.assertEquals(4, m1.getBuffer().length);
        Assert.assertEquals(4, m1.getLength());


        Assert.assertEquals(buf.length, m2.getRawBuffer().length);
        Assert.assertEquals(3, m2.getBuffer().length);
        Assert.assertEquals(3, m2.getLength());
    }

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    public static void testSetObject() {
        String s1="Bela Ban";
        Message m1=new Message(null, null, s1);
        Assert.assertEquals(0, m1.getOffset());
        Assert.assertEquals(m1.getBuffer().length, m1.getLength());
        String s2=(String)m1.getObject();
        Assert.assertEquals(s2, s1);
    }

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    public static void testCopy() {
        Message m1=new Message(null, null, "Bela Ban");
        Message m2=m1.copy();
        Assert.assertEquals(m1.getOffset(), m2.getOffset());
        Assert.assertEquals(m1.getLength(), m2.getLength());
    }

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