-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
ProcessStreamHandler.java
133 lines (120 loc) · 3.83 KB
/
ProcessStreamHandler.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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/*
* 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.test;
import java.io.PrintStream;
import org.neo4j.test.StreamConsumer.StreamExceptionHandler;
import static org.neo4j.test.StreamConsumer.IGNORE_FAILURES;
import static org.neo4j.test.StreamConsumer.PRINT_FAILURES;
/**
* Having trouble with your {@link Process}'s output and error streams?
* Are they getting filled up and your main thread hangs? Fear no more. Use this
* class to bundle everything up in one nifty little object that handles all
* your needs. Use the {@code ProcessStreamHandler#launch()} method to start
* the consumer threads and once you are {@code ProcessStreamHandler#done()}
* just say so.
*/
public class ProcessStreamHandler
{
private final Thread out;
private final Thread err;
private final Process process;
/**
* Convenience constructor assuming the local output streams are
* {@link System#out} and {@link System#err} for the process's OutputStream
* and ErrorStream respectively.
* <p>
* Set quiet to true if you just want to consume the output to avoid locking up the process.
*
* @param process The process whose output to consume.
*/
public ProcessStreamHandler( Process process, boolean quiet )
{
this( process, quiet, "", quiet ? IGNORE_FAILURES : PRINT_FAILURES );
}
public ProcessStreamHandler( Process process, boolean quiet, String prefix, StreamExceptionHandler failureHandler )
{
this( process, quiet, prefix, failureHandler, System.out, System.err );
}
public ProcessStreamHandler( Process process, boolean quiet, String prefix, StreamExceptionHandler failureHandler, PrintStream out, PrintStream err )
{
this.process = process;
this.out = new Thread( new StreamConsumer( process.getInputStream(), out, quiet, prefix, failureHandler ) );
this.err = new Thread( new StreamConsumer( process.getErrorStream(), err, quiet, prefix, failureHandler ) );
}
/**
* Starts the consumer threads. Calls {@link Thread#start()}.
*/
public void launch()
{
out.start();
err.start();
}
/**
* Joins with the consumer Threads. Calls {@link Thread#join()} on the two
* consumers.
*/
public void done()
{
if ( process.isAlive() )
{
process.destroyForcibly();
}
try
{
out.join();
}
catch ( InterruptedException e )
{
Thread.interrupted();
e.printStackTrace();
}
try
{
err.join();
}
catch ( InterruptedException e )
{
Thread.interrupted();
e.printStackTrace();
}
}
public void cancel()
{
out.interrupt();
err.interrupt();
}
public int waitForResult()
{
launch();
try
{
return process.waitFor();
}
catch ( InterruptedException e )
{
Thread.interrupted();
return 0;
}
finally
{
done();
}
}
}