gistfile1.java

/**
 * Tired of using <code>QueueFactory.getQueue("the-queue").add(TaskOptions.Builder.withPayload(theDeferredTask))</code> in your code,
 * and want to use something like <code>new MyTask(..).enqueue()</code> or <code>new MyTask(..).enqueue(Queue.THE_QUEUE)</code>?
 *
 * See the implementation below with the SendCreateUserConfirmationEmailTask as concrete task to be queued like:
 * <code>new SendCreateUserConfirmationEmailTask("spam-steve@microsoft.com").enqueue()</code>.
 */


// Task.java
import com.google.appengine.api.taskqueue.DeferredTask;

public interface Task extends DeferredTask {

	public void enqueue();

	public void enqueue(Queue queue);
}

// Queue.java
public enum Queue {

	DEFAULT("default"),
	EMAIL("email");
	// the email queue is just an exmample, add any queue you want to this enum

	private final String name;

	private Queue(String name) {
		this.name = name;
	}

	public String toString() {
		return name;
	}
}

// AbstractTask.java
import com.google.appengine.api.taskqueue.QueueFactory;
import com.google.appengine.api.taskqueue.TaskOptions;

public abstract class AbstractTask implements Task {

	@Override
	public void enqueue() {
		enqueue(Queue.DEFAULT);
	}

	@Override
	public void enqueue(Queue queue) {
		QueueFactory.getQueue(queue.toString()).add(TaskOptions.Builder.withPayload(this));
	}
}

// SendCreateUserConfirmationEmailTask .java
public class SendCreateUserConfirmationEmailTask extends AbstractTask {

	private String to;

	public SendCreateUserConfirmationEmailTask(String to) {
		this.to = to;
	}
	
	@Override
	public void run() {
		// send the email, or do whatever your task need to do
	}
}