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
17package com.googlecode.android_scripting.future;
18
19import java.util.concurrent.CountDownLatch;
20import java.util.concurrent.Future;
21import java.util.concurrent.TimeUnit;
22
23/**
24 * FutureResult represents an eventual execution result for asynchronous operations.
25 *
26 */
27public class FutureResult<T> implements Future<T> {
28
29    private final CountDownLatch mLatch = new CountDownLatch(1);
30    private volatile T mResult = null;
31
32    public void set(T result) {
33        mResult = result;
34        mLatch.countDown();
35    }
36
37    @Override
38    public boolean cancel(boolean mayInterruptIfRunning) {
39        return false;
40    }
41
42    @Override
43    public T get() throws InterruptedException {
44        mLatch.await();
45        return mResult;
46    }
47
48    @Override
49    public T get(long timeout, TimeUnit unit) throws InterruptedException {
50        mLatch.await(timeout, unit);
51        return mResult;
52    }
53
54    @Override
55    public boolean isCancelled() {
56        return false;
57    }
58
59    @Override
60    public boolean isDone() {
61        return mResult != null;
62    }
63
64}
65