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
17package 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//
29public 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