-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
ProducerStep.java
113 lines (101 loc) · 3.38 KB
/
ProducerStep.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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
/*
* Copyright (c) 2002-2017 "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.unsafe.impl.batchimport.staging;
import java.util.Collection;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.IoThroughputStat;
import org.neo4j.unsafe.impl.batchimport.stats.Key;
import org.neo4j.unsafe.impl.batchimport.stats.Keys;
import org.neo4j.unsafe.impl.batchimport.stats.Stat;
import org.neo4j.unsafe.impl.batchimport.stats.StatsProvider;
import static org.neo4j.helpers.Exceptions.SILENT_UNCAUGHT_EXCEPTION_HANDLER;
/**
* Step that generally sits first in a {@link Stage} and produces batches that will flow downstream
* to other {@link Step steps}.
*/
public abstract class ProducerStep extends AbstractStep<Void> implements StatsProvider
{
protected final int batchSize;
public ProducerStep( StageControl control, Configuration config )
{
super( control, ">", config );
this.batchSize = config.batchSize();
}
/**
* Merely receives one call, like a start signal from the staging framework.
*/
@Override
public long receive( long ticket, Void batch )
{
// It's fine to not store a reference to this thread here because either it completes and exits
// normally, notices a panic and exits via an exception.
Thread thread = new Thread( name() )
{
@Override
public void run()
{
assertHealthy();
try
{
process();
endOfUpstream();
}
catch ( Throwable e )
{
issuePanic( e, false );
}
}
};
thread.setUncaughtExceptionHandler( SILENT_UNCAUGHT_EXCEPTION_HANDLER );
thread.start();
return 0;
}
protected abstract void process();
@SuppressWarnings( "unchecked" )
protected void sendDownstream( Object batch )
{
long time = downstream.receive( doneBatches.getAndIncrement(), batch );
downstreamIdleTime.add( time );
}
@Override
protected void collectStatsProviders( Collection<StatsProvider> into )
{
super.collectStatsProviders( into );
into.add( this );
}
@Override
public Stat stat( Key key )
{
if ( key == Keys.io_throughput )
{
return new IoThroughputStat( startTime, endTime, position() );
}
return null;
}
@Override
public Key[] keys()
{
return new Key[] { Keys.io_throughput };
}
/**
* @return progress in terms of bytes.
*/
protected abstract long position();
}