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> {
cancel()30     public void cancel();
isCancelled()31     public boolean isCancelled();
isDone()32     public boolean isDone();
get()33     public T get();
waitDone()34     public void waitDone();
35 }
36