-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
FileWatcherLifecycleAdapter.java
99 lines (89 loc) · 2.76 KB
/
FileWatcherLifecycleAdapter.java
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
/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.util.watcher;
import java.util.concurrent.ThreadFactory;
import org.neo4j.io.fs.watcher.FileWatcher;
import org.neo4j.scheduler.JobScheduler;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
/**
* Adapter that integrates file watching possibilities with platform lifecycle.
* Monitoring will be started when corresponding life will be started and stopped as soon as life will be stopped.
*
* In case of restart new monitoring thread will be started.
*/
public class FileWatcherLifecycleAdapter extends LifecycleAdapter
{
private final JobScheduler jobScheduler;
private final FileWatcher fileWatcher;
private final FileSystemEventWatcher eventWatcher;
private ThreadFactory fileWatchers;
private Thread watcher;
public FileWatcherLifecycleAdapter( JobScheduler jobScheduler, FileWatcher fileWatcher )
{
this.jobScheduler = jobScheduler;
this.fileWatcher = fileWatcher;
this.eventWatcher = new FileSystemEventWatcher();
}
@Override
public void init()
{
fileWatchers = jobScheduler.threadFactory( JobScheduler.Groups.fileWatch );
}
@Override
public void start()
{
watcher = fileWatchers.newThread( eventWatcher );
watcher.start();
}
@Override
public void stop() throws Throwable
{
eventWatcher.stopWatching();
if ( watcher != null )
{
watcher.interrupt();
watcher.join();
watcher = null;
}
}
@Override
public void shutdown() throws Throwable
{
fileWatcher.close();
}
private class FileSystemEventWatcher implements Runnable
{
@Override
public void run()
{
try
{
fileWatcher.startWatching();
}
catch ( InterruptedException ignored )
{
}
}
void stopWatching()
{
fileWatcher.stopWatching();
}
}
}