-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
LockWrapper.java
91 lines (81 loc) · 2.61 KB
/
LockWrapper.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
/*
* Copyright (c) 2002-2019 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.store.kvstore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import org.neo4j.logging.Logger;
import org.neo4j.util.FeatureToggles;
public class LockWrapper implements AutoCloseable
{
private static final boolean debugLocking = FeatureToggles.flag( AbstractKeyValueStore.class, "debugLocking", false );
public static LockWrapper readLock( UpdateLock lock, Logger logger )
{
return new LockWrapper( lock.readLock(), lock, logger );
}
public static LockWrapper writeLock( UpdateLock lock, Logger logger )
{
return new LockWrapper( lock.writeLock(), lock, logger );
}
private Lock lock;
private LockWrapper( Lock lock, UpdateLock managingLock, Logger logger )
{
this.lock = lock;
if ( debugLocking )
{
if ( !lock.tryLock() )
{
logger.log( Thread.currentThread() + " may block on " + lock + " of " + managingLock );
while ( !tryLockBlocking( lock, managingLock, logger ) )
{
logger.log( Thread.currentThread() + " still blocked on " + lock + " of " + managingLock );
}
}
}
else
{
lock.lock();
}
}
private static boolean tryLockBlocking( Lock lock, UpdateLock managingLock, Logger logger )
{
try
{
return lock.tryLock( 1, TimeUnit.HOURS );
}
catch ( InterruptedException e )
{
logger.log( Thread.currentThread() + " ignoring interrupt while blocked on " + lock + " of " + managingLock );
}
return false;
}
@Override
public void close()
{
if ( lock != null )
{
lock.unlock();
lock = null;
}
}
public Lock get()
{
return lock;
}
}