/*******************************************************************************
 * Copyright (c) 2008, 2009 Wind River Systems and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
//#ifdef exercises
package org.eclipse.cdt.examples.dsf.requestmonitor;
//#else
//#package org.eclipse.cdt.examples.dsf.requestmonitor.answers;
//#endif

import java.util.concurrent.Executor;

import org.eclipse.cdt.dsf.concurrent.ImmediateExecutor;
import org.eclipse.cdt.dsf.concurrent.RequestMonitor;

/**
 * "Hello world" example which uses an asynchronous method to print out
 * the result.  
 * <p>
 * The main method uses an immediate executor, which executes runnables
 * as soon as they are submitted, in creating its request monitor. 
 * 
 */
public class AsyncHelloWorld {

    public static void main(String[] args) {
        Executor executor = ImmediateExecutor.getInstance();
        RequestMonitor rm = new RequestMonitor(executor, null);
        asyncHelloWorld(rm);
    }

    static void asyncHelloWorld(RequestMonitor rm) {
        System.out.println("Hello world");
        //#ifdef exercises
        // TODO Exercise 1: - Call the second async. "Hello world 2" method.
        // Hint: Calling an asynchronous method requires passing to it a 
        // request monitor.  A new request monitor can be constructed with 
        // a parent RequestMonitor as an argument argument.  The parent gets 
        // completed automatically when the lower level request monitor is 
        // completed.
        rm.done();
        //#else
//#        RequestMonitor rm2 = new RequestMonitor(ImmediateExecutor.getInstance(), rm);
//#        asyncHelloWorld2(rm2);
        //#endif
    }
    
    //#ifdef exercises
    // TODO: Exercise 1 - Add a second async. "Hello world 2" method.   
    //#else
//#    static void asyncHelloWorld2(RequestMonitor rm) {
//#        System.out.println("Hello world 2");
//#        rm.done();
//#    }
    //#endif
}