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Java example source code file (Future.java)

This example Java source code file (Future.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

executionexception, future, interruptedexception, timeoutexception, timeunit

The Future.java Java example source code

/*
 * Copyright (C) 2015 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package java.util.concurrent;

/**
 * Emulation of Future. Since GWT environment is single threaded, attempting to block on the future
 * by calling {@link #get()} or {@link #get(long, TimeUnit)} when the it is not yet done is
 * considered illegal because it would lead to a deadlock. Future implementations must throw
 * {@link IllegalStateException} to avoid a deadlock.
 */
public interface Future<V> {
   boolean cancel(boolean mayInterruptIfRunning);

   boolean isCancelled();

   boolean isDone();

   V get() throws InterruptedException, ExecutionException;

   V get(long timeout, TimeUnit unit)
       throws InterruptedException, ExecutionException, TimeoutException;
}

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