HelloClientComponent.java

/*******************************************************************************
* Copyright (c) 2009 Composent, Inc. 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:
*   Composent, Inc. - initial API and implementation
******************************************************************************/
package org.eclipse.ecf.examples.internal.remoteservices.hello.ds.consumer;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.ecf.examples.remoteservices.hello.IHello;
import org.eclipse.ecf.examples.remoteservices.hello.IHelloAsync;
import org.eclipse.ecf.remoteservice.IAsyncCallback;
import org.eclipse.ecf.remoteservice.IRemoteService;
import org.eclipse.ecf.remoteservice.IRemoteServiceProxy;
import org.eclipse.ecf.remoteservice.RemoteServiceHelper;
import org.eclipse.equinox.concurrent.future.IFuture;

public class HelloClientComponent {

	private static final String CONSUMER_NAME = "helloclientcomponent";
	
	public void bindHello(IHello proxy) {
		// First print out on console that we got a proxy instance
		System.out.println("Got proxy IHello="+proxy);
		
		// Call proxy synchronously.  Note that this call may block or fail due to 
		// synchronous communication with remote service
		System.out.println("STARTING remote call via proxy...");
		proxy.hello(CONSUMER_NAME+" via proxy");
		System.out.println("COMPLETED remote call via proxy");
		System.out.println();
		
		// If the proxy is also an instance of IHelloAsync then use
		// this asynchronous interface to invoke methods asynchronously
		if (proxy instanceof IHelloAsync) {
			IHelloAsync helloA = (IHelloAsync) proxy;
			// Create callback for use in IHelloAsync
			IAsyncCallback callback = new IAsyncCallback<String>() {
				public void onSuccess(String result) {
					System.out.println("COMPLETED remote call with callback SUCCESS with result="+result);
					System.out.println();
				}
				public void onFailure(Throwable t) {
					System.out.println("COMPLETED remote call with callback FAILED with exception="+t);
					System.out.println();
				}
			};
			
			// Call asynchronously with callback
			System.out.println("STARTING async remote call via callback...");
			helloA.helloAsync(CONSUMER_NAME + " via async proxy with listener", callback);
			System.out.println("LOCAL async invocation complete");
			System.out.println();
			
			// Call asynchronously with future
			System.out.println("STARTING async remote call via future...");
			Future<String> future = helloA.helloAsync(CONSUMER_NAME + " via async proxy with future");
			System.out.println("LOCAL async future invocation complete");
			System.out.println();
			try {
				while (!future.isDone()) {
					// do some other stuff
					System.out.println("LOCAL future not yet done...so we're doing other stuff while waiting for future to be done");
					Thread.sleep(200);
				}
				// Now it's done, so this will not block
				String result = future.get();
				System.out.println("COMPLETED remote call with future SUCCEEDED with result="+result);
				System.out.println();
			} catch (OperationCanceledException e) {
				System.out.println("COMPLETED remote call with callback CANCELLED with exception="+e);
				System.out.println();
				e.printStackTrace();
			} catch (InterruptedException e) {
				System.out.println("COMPLETED remote call with callback INTERRUPTED with exception="+e);
				System.out.println();
				e.printStackTrace();
			} catch (ExecutionException e) {
				System.out.println("COMPLETED remote call with callback INTERRUPTED with exception="+e);
				System.out.println();
				e.printStackTrace();
			}
		}
		
		// It's also possible to get the remote service directly from the proxy
		IRemoteService remoteService = ((IRemoteServiceProxy) proxy).getRemoteService();
		Assert.isNotNull(remoteService);
		
		// In this case, we will make an non-blocking call and immediately get a 'future'...which is
		// a placeholder for a result of the remote computation.  This will not block.
		System.out.println("STARTING async remote call via future...");
		IFuture future = RemoteServiceHelper.futureExec(remoteService, "hello",
				new Object[] { CONSUMER_NAME + " future" });
		System.out.println("LOCAL async future invocation complete");
		System.out.println();
		// Client can execute arbitrary code here...
		try {
			// This blocks until communication and computation have completed successfully
			while (!future.isDone()) {
				// do some other stuff
				System.out.println("LOCAL future not yet done...so we're doing other stuff while waiting for future to be done");
				Thread.sleep(200);
			}
			// Now it's done, so this will not block
			Object result = future.get();
			System.out.println("COMPLETED remote call with future SUCCEEDED with result="+result);
			System.out.println();
		} catch (Exception e) {
			e.printStackTrace();
		}

		
	}
	
}