examples/reactor/src/main/java/org/apache/qpid/proton/example/reactor/Scheduling.java

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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.qpid.proton.example.reactor;

import java.io.IOException;

import org.apache.qpid.proton.Proton;
import org.apache.qpid.proton.engine.BaseHandler;
import org.apache.qpid.proton.engine.Event;
import org.apache.qpid.proton.reactor.Reactor;
import org.apache.qpid.proton.reactor.Task;

public class Scheduling extends BaseHandler {

    private long startTime;

    @Override
    public void onReactorInit(Event event) {
        startTime = System.currentTimeMillis();
        System.out.println("Hello, World!");

        // We can schedule a task event for some point in the future.
        // This will cause the reactor to stick around until it has a
        // chance to process the event.

        // The first argument is the delay. The second argument is the
        // handler for the event. We are just using self for now, but
        // we could pass in another object if we wanted.
        Task task = event.getReactor().schedule(1000, this);

        // We can ignore the task if we want to, but we can also use it
        // to pass stuff to the handler.
        task.attachments().set("key", String.class, "Yay");
    }

    @Override
    public void onTimerTask(Event event) {
        Task task = event.getTask();
        System.out.println(task.attachments().get("key", String.class) + " my task is complete!");
    }

    @Override
    public void onReactorFinal(Event e) {
        long elapsedTime = System.currentTimeMillis() - startTime;
        System.out.println("Goodbye, World! (after " + elapsedTime + " long milliseconds)");
    }

    public static void main(String[] args) throws IOException {
        Reactor reactor = Proton.reactor(new Scheduling());
        reactor.run();
    }
}