1 /*
2  * Copyright (C) 2016 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 
17 package com.googlecode.android_scripting.future;
18 
19 import java.util.concurrent.CountDownLatch;
20 import java.util.concurrent.Future;
21 import java.util.concurrent.TimeUnit;
22 
23 /**
24  * FutureResult represents an eventual execution result for asynchronous operations.
25  *
26  * @author Damon Kohler (damonkohler@gmail.com)
27  */
28 public class FutureResult<T> implements Future<T> {
29 
30     private final CountDownLatch mLatch = new CountDownLatch(1);
31     private volatile T mResult = null;
32 
set(T result)33     public void set(T result) {
34         mResult = result;
35         mLatch.countDown();
36     }
37 
38     @Override
cancel(boolean mayInterruptIfRunning)39     public boolean cancel(boolean mayInterruptIfRunning) {
40         return false;
41     }
42 
43     @Override
get()44     public T get() throws InterruptedException {
45         mLatch.await();
46         return mResult;
47     }
48 
49     @Override
get(long timeout, TimeUnit unit)50     public T get(long timeout, TimeUnit unit) throws InterruptedException {
51         mLatch.await(timeout, unit);
52         return mResult;
53     }
54 
55     @Override
isCancelled()56     public boolean isCancelled() {
57         return false;
58     }
59 
60     @Override
isDone()61     public boolean isDone() {
62         return mResult != null;
63     }
64 
65 }
66