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 (at) 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 33 public void set(T result) { 34 mResult = result; 35 mLatch.countDown(); 36 } 37 38 @Override 39 public boolean cancel(boolean mayInterruptIfRunning) { 40 return false; 41 } 42 43 @Override 44 public T get() throws InterruptedException { 45 mLatch.await(); 46 return mResult; 47 } 48 49 @Override 50 public T get(long timeout, TimeUnit unit) throws InterruptedException { 51 mLatch.await(timeout, unit); 52 return mResult; 53 } 54 55 @Override 56 public boolean isCancelled() { 57 return false; 58 } 59 60 @Override 61 public boolean isDone() { 62 return mResult != null; 63 } 64 65 } 66
