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package org.jdeferred;

import java.util.concurrent.Callable;

import org.jdeferred.DeferredManager.StartPolicy;
import org.jdeferred.impl.DeferredObject;

/**
 * Use this as superclass in case you need to be able to return a result and notify progress.
 * If you don't need to notify progress, you can simply use {@link Callable}
 * 
 * @see #notify(Object)
 * @author Ray Tsang
 *
 * @param  Type used as return type of {@link Callable#call()}, and {@link Deferred#resolve(Object)}
 * @param  Type used for {@link Deferred#notify(Object)}
 */
public abstract class DeferredCallable implements Callable {
	private final Deferred deferred = new DeferredObject();
	private final StartPolicy startPolicy;
	
	public DeferredCallable() {
		this.startPolicy = StartPolicy.DEFAULT;
	}
	
	public DeferredCallable(StartPolicy startPolicy) {
		this.startPolicy = startPolicy;
	}
	
	/**
	 * @see Deferred#notify(Object)
	 * @param progress
	 */
	protected void notify(P progress) {
		deferred.notify(progress);
	}
	
	protected Deferred getDeferred() {
		return deferred;
	}

	public StartPolicy getStartPolicy() {
		return startPolicy;
	}
}