protected Buffer writeMessage(final Message msg) throws Exception {
out_stream.reset();
dos.reset();
byte flags = 0;
dos.writeShort(Version.version); // write the version
if (msg.getDest() == null) flags += (byte) 2;
dos.writeByte(flags);
msg.writeTo(dos);
return new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());
}
void sendMessages() throws Exception {
if (num_threads > 1 && num_msgs % num_threads != 0) {
System.err.println(
"num_msgs (" + num_msgs + " ) has to be divisible by num_threads (" + num_threads + ")");
return;
}
System.out.println(
"sending "
+ num_msgs
+ " messages ("
+ Util.printBytes(msg_size)
+ ") to "
+ remote
+ ": oob="
+ oob
+ ", "
+ num_threads
+ " sender thread(s)");
ByteBuffer buf =
ByteBuffer.allocate(Global.BYTE_SIZE + Global.LONG_SIZE).put(START).putLong(num_msgs);
Message msg = new Message(null, buf.array());
// msg.writeTo(output);
ExposedByteArrayOutputStream out_stream = new ExposedByteArrayOutputStream((int) (msg.size()));
ExposedDataOutputStream dos = new ExposedDataOutputStream(out_stream);
byte flags = 0;
dos.writeShort(Version.version); // write the version
if (msg.getDest() == null) flags += (byte) 2;
dos.writeByte(flags);
msg.writeTo(dos);
Buffer buffer = new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());
output_lock.lock(); // need to sync if we have more than 1 sender
try {
// msg.writeTo(output);
output.writeInt(buffer.getLength());
output.write(buffer.getBuf(), buffer.getOffset(), buffer.getLength());
} finally {
output_lock.unlock();
}
int msgs_per_sender = num_msgs / num_threads;
Sender[] senders = new Sender[num_threads];
for (int i = 0; i < senders.length; i++)
senders[i] = new Sender(msgs_per_sender, msg_size, num_msgs / 10);
for (Sender sender : senders) sender.start();
for (Sender sender : senders) sender.join();
output.flush();
System.out.println("done sending " + num_msgs + " to " + remote);
}
void sendMcastDiscoveryRequest(Message msg) {
Buffer buf;
DatagramPacket packet;
DataOutputStream out = null;
try {
if (msg.getSrc() == null) msg.setSrc(local_addr);
ExposedByteArrayOutputStream out_stream = new ExposedByteArrayOutputStream(128);
out = new DataOutputStream(out_stream);
msg.writeTo(out);
out.flush(); // flushes contents to out_stream
buf = new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());
packet =
new DatagramPacket(
buf.getBuf(), buf.getOffset(), buf.getLength(), mcast_addr, mcast_port);
discovery_reception.reset();
if (mcast_send_sockets != null) {
MulticastSocket s;
for (int i = 0; i < mcast_send_sockets.length; i++) {
s = mcast_send_sockets[i];
try {
s.send(packet);
} catch (Exception e) {
log.error("failed sending packet on socket " + s);
}
}
} else { // DEFAULT path
if (mcast_sock != null) mcast_sock.send(packet);
}
waitForDiscoveryRequestReception();
} catch (IOException ex) {
log.error("failed sending discovery request", ex);
} finally {
Util.close(out);
}
}
