-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
TimeCheckPointThreshold.java
68 lines (59 loc) · 2.27 KB
/
TimeCheckPointThreshold.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
/*
* Copyright (c) 2002-2016 "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.transaction.log.checkpoint;
import java.time.Clock;
import java.util.concurrent.ThreadLocalRandom;
public class TimeCheckPointThreshold extends AbstractCheckPointThreshold
{
private volatile long lastCheckPointedTransactionId;
private volatile long nextCheckPointTime;
private final long timeMillisThreshold;
private final Clock clock;
public TimeCheckPointThreshold( long thresholdMillis, Clock clock )
{
this.timeMillisThreshold = thresholdMillis;
this.clock = clock;
// The random start offset means database in a cluster will not all check-point at the same time.
long randomStartOffset = thresholdMillis > 0? ThreadLocalRandom.current().nextLong( thresholdMillis ) : 0;
this.nextCheckPointTime = clock.millis() + thresholdMillis + randomStartOffset;
}
@Override
public void initialize( long transactionId )
{
lastCheckPointedTransactionId = transactionId;
}
@Override
protected boolean thresholdReached( long lastCommittedTransactionId )
{
return lastCommittedTransactionId > lastCheckPointedTransactionId &&
clock.millis() >= nextCheckPointTime;
}
@Override
protected String description()
{
return "time threshold";
}
@Override
public void checkPointHappened( long transactionId )
{
nextCheckPointTime = clock.millis() + timeMillisThreshold;
lastCheckPointedTransactionId = transactionId;
}
}