How to use

writeTo

method

in

org.jgroups.stack.GossipData

protected synchronized void writeRequest(GossipData req) throws Exception {
  int size=req.serializedSize();
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(size+5);
  req.writeTo(out);
  client.send(remote, out.buffer(), 0, out.position());
}

protected void handleGetMembersRequest(Address sender, DataInput in) {
  GossipData req=readRequest(in, GossipType.GET_MBRS);
  if(req == null)
    return;
  GossipData rsp=new GossipData(GossipType.GET_MBRS_RSP, req.getGroup(), null);
  Map<Address,Entry> members=address_mappings.get(req.getGroup());
  if(members != null) {
    for(Map.Entry<Address,Entry> entry : members.entrySet()) {
      Address logical_addr=entry.getKey();
      PhysicalAddress phys_addr=entry.getValue().phys_addr;
      String logical_name=entry.getValue().logical_name;
      PingData data=new PingData(logical_addr, true, logical_name, phys_addr);
      rsp.addPingData(data);
    }
  }
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(rsp.serializedSize());
  try {
    rsp.writeTo(out);
    server.send(sender, out.buffer(), 0, out.position());
  }
  catch(Exception ex) {
    log.error("failed sending %d to %s: %s", GossipType.GET_MBRS_RSP, sender, ex);
  }
}

protected void sendToMember(Address dest, GossipData request) {
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(request.serializedSize());
  try {
    request.writeTo(out);
    server.send(dest, out.buffer(), 0, out.position());
  }
  catch(Exception ex) {
    log.error("failed sending unicast message to %s: %s", dest, ex);
  }
}

protected void sendToAllMembersInGroup(Set<Map.Entry<Address,Entry>> dests, GossipData request) {
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(request.serializedSize());
  try {
    request.writeTo(out);
  }
  catch(Exception ex) {
    log.error("failed marshalling gossip data %s: %s; dropping request", request, ex);
    return;
  }
  for(Map.Entry<Address,Entry> entry: dests) {
    Entry e=entry.getValue();
    if(e == null /* || e.phys_addr == null */)
      continue;
    try {
      server.send(e.client_addr, out.buffer(), 0, out.position());
    }
    catch(Exception ex) {
      log.error("failed sending message to %s (%s): %s", e.logical_name, e.phys_addr, ex);
    }
  }
}

request.writeTo(out);
route(request.group, request.addr, out.buffer(), 0, out.position());

gossip_req.writeTo(out);
out.flush();

gossip_req.writeTo(out);
out.flush();

output = new DataOutputStream(sock.getOutputStream());
GossipData req = new GossipData(GossipRouter.CONNECT, groupname, getLocalAddress(),null);
req.writeTo(output);
output.flush();
input = new DataInputStream(sock.getInputStream());

gossip_req.writeTo(out);
out.flush();

protected synchronized void writeRequest(GossipData req) throws Exception {
  int size=req.serializedSize();
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(size+5);
  req.writeTo(out);
  client.send(remote, out.buffer(), 0, out.position());
}

protected void handleGetMembersRequest(Address sender, DataInput in) {
  GossipData req=readRequest(in, GossipType.GET_MBRS);
  if(req == null)
    return;
  GossipData rsp=new GossipData(GossipType.GET_MBRS_RSP, req.getGroup(), null);
  Map<Address,Entry> members=address_mappings.get(req.getGroup());
  if(members != null) {
    for(Map.Entry<Address,Entry> entry : members.entrySet()) {
      Address logical_addr=entry.getKey();
      PhysicalAddress phys_addr=entry.getValue().phys_addr;
      String logical_name=entry.getValue().logical_name;
      PingData data=new PingData(logical_addr, true, logical_name, phys_addr);
      rsp.addPingData(data);
    }
  }
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(rsp.serializedSize());
  try {
    rsp.writeTo(out);
    server.send(sender, out.buffer(), 0, out.position());
  }
  catch(Exception ex) {
    log.error("failed sending %d to %s: %s", GossipType.GET_MBRS_RSP, sender, ex);
  }
}

public synchronized void disconnect() {
  if(isConnected()){
    try{
      GossipData req = new GossipData(GossipRouter.DISCONNECT, groupname, local_addr,null);
      req.writeTo(output);
      output.flush();
    }catch(Exception e){
    }finally{
      Util.close(output);
      Util.close(input);
      Util.close(sock);
      Util.close(my_sock);
      sock = null;                
      connectionStateChanged(STATUS_DISCONNECTED);
    }
  }
}

protected void sendToMember(Address dest, GossipData request) {
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(request.serializedSize());
  try {
    request.writeTo(out);
    server.send(dest, out.buffer(), 0, out.position());
  }
  catch(Exception ex) {
    log.error("failed sending unicast message to %s: %s", dest, ex);
  }
}

protected void sendToAllMembersInGroup(Set<Map.Entry<Address,Entry>> dests, GossipData request) {
  ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(request.serializedSize());
  try {
    request.writeTo(out);
  }
  catch(Exception ex) {
    log.error("failed marshalling gossip data %s: %s; dropping request", request, ex);
    return;
  }
  for(Map.Entry<Address,Entry> entry: dests) {
    Entry e=entry.getValue();
    if(e == null /* || e.phys_addr == null */)
      continue;
    try {
      server.send(e.client_addr, out.buffer(), 0, out.position());
    }
    catch(Exception ex) {
      log.error("failed sending message to %s (%s): %s", e.logical_name, e.phys_addr, ex);
    }
  }
}

output=new DataOutputStream(sock.getOutputStream());
GossipData rsp=new GossipData(GossipRouter.GET_RSP, group, null, mbrs);
rsp.writeTo(output);
Util.close(input);
Util.close(output);
  log.trace("ROUTER_GET(" + group + ") --> " + ret);
rsp=new GossipData(GossipRouter.GET_RSP, group, null, ret);
rsp.writeTo(output);
Util.close(input);
Util.close(output);

request.writeTo(out);
route(request.group, request.addr, out.buffer(), 0, out.position());