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/* Copyright (c) 2023-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
/* This example shows how to use message queues. It is very similar to the comm_await test, but with message queues :)
*/
import org.simgrid.s4u.*;
class Sender extends Actor {
int messages_count;
public Sender(int messages_count) { this.messages_count = messages_count; }
public void run()
{
MessageQueue mqueue = this.get_engine().message_queue_by_name("control");
this.sleep_for(0.5);
Engine.info("Send 'hello' to 'receiver'");
mqueue.put(new String("hello"));
for (int i = 0; i < messages_count; i++) {
String payload = "Message " + i;
/* Create a control message and put it in the message queue */
Mess mess = mqueue.put_async(payload);
Engine.info("Send '%s' to '%s'", payload, mqueue.get_name());
mess.await();
}
/* Send message to let the receiver know that it should stop */
Engine.info("Send 'finalize' to 'receiver'");
mqueue.put(new String("finalize"));
}
}
/* Receiver actor expects no argument */
class Receiver extends Actor {
public void run()
{
MessageQueue mqueue = this.get_engine().message_queue_by_name("control");
this.sleep_for(1);
Mess hello = mqueue.get_async();
hello.await();
String msg = (String)hello.get_payload();
Engine.info("I got a '%s'.", msg);
Engine.info("Await for my first message");
for (boolean cont = true; cont;) {
Mess mess = mqueue.get_async();
this.sleep_for(0.1);
mess.await();
String received = (String)mess.get_payload();
Engine.info("I got a '%s'.", received);
if (received.equals("finalize"))
cont = false; // If it's a finalize message, we're done.
}
}
}
public class mess_await {
public static void main(String[] args)
{
Engine e = new Engine(args);
e.load_platform(args[0]);
e.add_actor("sender", e.host_by_name("Tremblay"), new Sender(3));
e.add_actor("receiver", e.host_by_name("Fafard"), new Receiver());
e.run();
}
}
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