blob: f18a2690f78be968a026a0d44d769f6439bb6f0f (
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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.com>
*
* 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.orbekk.protobuf;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.PriorityQueue;
import java.io.Closeable;
import java.io.IOException;
public class TimeoutManager extends Thread {
private static final Logger logger =
Logger.getLogger(TimeoutManager.class.getName());
private Environment environment;
private PriorityQueue<Entry> entries = new PriorityQueue<Entry>();
private static class Entry implements Comparable<Entry> {
// May not be null.
public Long timeout;
public Closeable closeable;
public Entry(long timeout, Closeable closeable) {
this.timeout = timeout;
this.closeable = closeable;
}
public void close() throws IOException {
closeable.close();
}
@Override public int compareTo(Entry other) {
return timeout.compareTo(other.timeout);
}
}
public interface Environment {
long currentTimeMillis();
void sleep(long millis) throws InterruptedException;
}
public static class DefaultEnvironment implements Environment {
@Override public long currentTimeMillis() {
return System.currentTimeMillis();
}
@Override public void sleep(long millis) throws InterruptedException {
Thread.sleep(millis);
}
}
TimeoutManager(Environment environment) {
this.environment = environment;
}
public TimeoutManager() {
this(new DefaultEnvironment());
}
public synchronized void performWork() {
try {
if (entries.isEmpty()) {
wait();
} else {
long sleepTime = entries.peek().timeout -
environment.currentTimeMillis();
if (sleepTime > 0) {
wait(sleepTime);
}
}
closeExpiredEntries();
} catch (InterruptedException e) {
// Handled by outer loop.
}
}
@Override public void run() {
while (!Thread.interrupted()) {
performWork();
}
}
public synchronized void closeExpiredEntries() {
long currentTime = environment.currentTimeMillis();
while (!entries.isEmpty() && entries.peek().timeout <= currentTime) {
try {
entries.poll().close();
} catch (IOException e) {
logger.log(Level.INFO, "Could not close entry. ", e);
}
}
}
public synchronized void addEntry(long timeoutTime, Closeable closeable) {
if (entries.isEmpty() || timeoutTime <= entries.peek().timeout) {
notify();
}
entries.add(new Entry(timeoutTime, closeable));
}
}
|