MockNamedTaskExecutor.java revision a48af083ff81555261f334a1e050eae3b02a746c 
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.quicksearchbox.util;
18
19import java.util.LinkedList;
20
21/**
22 * A simple executor that maintains a queue and executes one task synchronously every
23 * time {@link #runNext()} is called. This gives us predictable scheduling for the tests to
24 * avoid timeouts waiting for threads to finish.
25 */
26public class MockNamedTaskExecutor implements NamedTaskExecutor {
27
28    private final LinkedList<NamedTask> mQueue = new LinkedList<NamedTask>();
29
30    private boolean mClosed = false;
31
32    public void execute(NamedTask task) {
33        if (mClosed) throw new IllegalStateException("closed");
34        mQueue.addLast(task);
35    }
36
37    public void cancelPendingTasks() {
38        mQueue.clear();
39    }
40
41    public void close() {
42        cancelPendingTasks();
43        mClosed = true;
44    }
45
46    public boolean runNext() {
47        if (mQueue.isEmpty()) {
48            return false;
49        }
50        Runnable command = mQueue.removeFirst();
51        command.run();
52        return true;
53    }
54
55}
56