/**
* 1. Get all the fragment buffers 2. When all are received -> Assemble them into one big buffer
* 3. Read headers and byte buffer from big buffer 4. Set headers and buffer in msg 5. Pass msg up
* the stack
*/
private Message unfragment(Message msg, FragHeader hdr) {
Address sender = msg.getSrc();
FragmentationTable frag_table = fragment_list.get(sender);
if (frag_table == null) {
frag_table = new FragmentationTable(sender);
try {
fragment_list.add(sender, frag_table);
} catch (
IllegalArgumentException
x) { // the entry has already been added, probably in parallel from another thread
frag_table = fragment_list.get(sender);
}
}
num_received_frags++;
byte[] buf = frag_table.add(hdr.id, hdr.frag_id, hdr.num_frags, msg.getBuffer());
if (buf == null) return null;
try {
DataInput in = new ByteArrayDataInputStream(buf);
Message assembled_msg = new Message(false);
assembled_msg.readFrom(in);
assembled_msg.setSrc(sender); // needed ? YES, because fragments have a null src !!
if (log.isTraceEnabled()) log.trace("assembled_msg is " + assembled_msg);
num_received_msgs++;
return assembled_msg;
} catch (Exception e) {
log.error(Util.getMessage("FailedUnfragmentingAMessage"), e);
return null;
}
}
private void handleViewChange(View view) {
List<Address> new_mbrs = view.getMembers();
List<Address> left_mbrs = Util.determineLeftMembers(members, new_mbrs);
members.clear();
members.addAll(new_mbrs);
for (Address mbr : left_mbrs) {
// the new view doesn't contain the sender, it must have left,
// hence we will clear all of itsfragmentation tables
fragment_list.remove(mbr);
if (log.isTraceEnabled())
log.trace("[VIEW_CHANGE] removed " + mbr + " from fragmentation table");
}
}
