1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of 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, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.util; 18 19 // This Future differs from the java.util.concurrent.Future in these aspects: 20 // 21 // - Once cancel() is called, isCancelled() always returns true. It is a sticky 22 // flag used to communicate to the implementation. The implmentation may 23 // ignore that flag. Regardless whether the Future is cancelled, a return 24 // value will be provided to get(). The implementation may choose to return 25 // null if it finds the Future is cancelled. 26 // 27 // - get() does not throw exceptions. 28 // 29 public interface Future<T> { 30 public void cancel(); 31 public boolean isCancelled(); 32 public boolean isDone(); 33 public T get(); 34 public void waitDone(); 35 } 36
