1f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin/* 2f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Copyright (C) 2010 The Android Open Source Project 3f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 4f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Licensed under the Apache License, Version 2.0 (the "License"); 5f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * you may not use this file except in compliance with the License. 6f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * You may obtain a copy of the License at 7f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 8f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * http://www.apache.org/licenses/LICENSE-2.0 9f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 10f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Unless required by applicable law or agreed to in writing, software 11f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * distributed under the License is distributed on an "AS IS" BASIS, 12f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * See the License for the specific language governing permissions and 14f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * limitations under the License. 15f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin */ 16f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 17f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Linpackage com.android.gallery3d.util; 18f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 19f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// This Future differs from the java.util.concurrent.Future in these aspects: 20f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// 21f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// - Once cancel() is called, isCancelled() always returns true. It is a sticky 22f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// flag used to communicate to the implementation. The implmentation may 23f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// ignore that flag. Regardless whether the Future is cancelled, a return 24f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// value will be provided to get(). The implementation may choose to return 25f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// null if it finds the Future is cancelled. 26f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// 27f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// - get() does not throw exceptions. 28f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin// 29f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Linpublic interface Future<T> { 30f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public void cancel(); 31f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public boolean isCancelled(); 32f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public boolean isDone(); 33f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public T get(); 34f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public void waitDone(); 35f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin} 36