Examples of org.jgroups.protocols.FRAG2

org.jgroups.protocols.FRAG2

Fragmentation layer. Fragments messages larger than frag_size into smaller packets. Reassembles fragmented packets into bigger ones. The fragmentation number is prepended to the messages as a header (and removed at the receiving side).

Each fragment is identified by (a) the sender (part of the message to which the header is appended), (b) the fragmentation ID (which is unique per FRAG2 layer (monotonically increasing) and (c) the fragement ID which ranges from 0 to number_of_fragments-1.

Requirement: lossless delivery (e.g. NAK, ACK). No requirement on ordering. Works for both unicast and multicast messages.
Compared to FRAG, this protocol does not need to serialize the message in order to break it into smaller fragments: it looks only at the message's buffer, which is a byte[] array anyway. We assume that the size addition for headers and src and dest address is minimal when the transport finally has to serialize the message, so we add a constant (200 bytes). @author Bela Ban @version $Id: FRAG2.java,v 1.25 2006/08/23 07:20:12 belaban Exp $

        s.addMember(a1);
        FC fc=new FC();
        fc.setMinCredits(1000);
        fc.setMaxCredits(10000);
        fc.setMaxBlockTime(1000);
        FRAG2 frag=new FRAG2();
        frag.setFragSize(8000);
        Protocol[] stack=new Protocol[]{frag, fc};
        s.setProtocolStack(stack);
        s.start();
    }

        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())
        .addProtocol(new FRAG2());
    stack.init();
    
    channel.setReceiver(new ReceiverAdapter(){


      public void receive(Message msg) {

        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())
        .addProtocol(new FRAG2());
    stack.init();
    
    
  }

Examples of org.jgroups.protocols.FRAG2

Related Classes of org.jgroups.protocols.FRAG2