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package javax.ejb;

import java.io.Serializable;
import java.util.concurrent.*;

/**
  * Wraps the result of an asynchronous method call as a <code>Future</code>
  * object, preserving compatability with the business interface signature.
  * <p>
  * The value specified in the constructor will be retrieved by the container
  * and made available to the client.
  * <p>
  * Note that this object is not passed to the client.  It is
  * merely a convenience for providing the result value to the container.
  * Therefore, none of its instance methods should be called by the 
  * application.
  *
  * @since EJB 3.1
  */

public final class AsyncResult<V> implements Future<V> {

    private final V resultValue;

    public AsyncResult(V result) {
        resultValue = result;
    }

    /**
     * This method should not be called.  See Class-level comments.
     */
    public boolean cancel(boolean mayInterruptIfRunning) {
        throw new java.lang.IllegalStateException
	    ("Object does not represent an acutal Future");
    }

    /**
     * This method should not be called.  See Class-level comments.
     */
    public boolean isCancelled() {
        throw new java.lang.IllegalStateException
	    ("Object does not represent an acutal Future");
    }

    /**
     * This method should not be called.  See Class-level comments.
     */
    public boolean isDone() {
        throw new java.lang.IllegalStateException
	    ("Object does not represent an acutal Future");
    }

    /**
     * This method should not be called.  See Class-level comments.
     */
    public V get() throws InterruptedException, ExecutionException {
	    return resultValue;
    }

    /**
     * This method should not be called.  See Class-level comments.
     */
    public V get(long timeout, TimeUnit unit) 
	throws InterruptedException, ExecutionException, TimeoutException {
	throw new java.lang.IllegalStateException
	    ("Object does not represent an acutal Future");
    }

}