Java Doc for FRAG2.java in  » Net » JGroups-2.4.1-sp3 » org » jgroups » protocols » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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 1.25.2.1 2007/04/27 08:03:51 belaban Exp $

 Given the generated ID is 2344, number of fragments=3, message {dst,src,buf}
 would be fragmented into:
 [2344,3,0]{dst,src,buf1},
 [2344,3,1]{dst,src,buf2} and
 [2344,3,2]{dst,src,buf3}