blob: 07430fca7c972c9d22c43b957025df77af5e0e73 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.sched.util;
import com.google.common.collect.Lists;
import com.android.sched.util.config.HasKeyId;
import com.android.sched.util.config.ThreadConfig;
import com.android.sched.util.config.id.ObjectId;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nonnull;
/**
* A class to add, remove and execute hooks. Each instance of this class is registered as a runtime
* shutdown hook ({@link Runtime#addShutdownHook}) but can be managed by the user in order to
* trigger hooks at another level than {@link Runtime#addShutdownHook(Thread)}.
*
* Also declare a general purpose thread local {@code Config} shutdown hooks.
*/
@HasKeyId
public class RunnableHooks {
@Nonnull
private static final ObjectId<RunnableHooks> SHUTDOWN_HOOKS =
new ObjectId<RunnableHooks>("sched.internal.shutdown", RunnableHooks.class);
@Nonnull
private final List<Runnable> hooks = new ArrayList<Runnable>();
public synchronized void addHook(@Nonnull Runnable hook) {
assert !hooks.contains(hook);
hooks.add(hook);
}
public synchronized void removeHook(@Nonnull Runnable hook) {
assert hooks.contains(hook);
hooks.remove(hook);
}
public synchronized void runHooks() {
for (Runnable hook : Lists.reverse(hooks)) {
hook.run();
}
hooks.clear();
}
/**
* @return general purpose thread local {@code Config} shutdown hooks.
*/
@Nonnull
public static RunnableHooks getShutdownHooks() {
return ThreadConfig.get(SHUTDOWN_HOOKS);
}
}
|
