blob: 0d44fe7cf320c55bbb5300991363aeb33520603d (
plain)
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
|
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.queue;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.logging.actors.CurrentActor;
import org.apache.qpid.server.queue.QueueRunner;
import org.apache.qpid.server.queue.SimpleAMQQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* QueueRunners are Runnables used to process a queue when requiring
* asynchronous message delivery to subscriptions, which is necessary
* when straight-through delivery of a message to a subscription isn't
* possible during the enqueue operation.
*/
public class QueueRunner implements Runnable
{
private static final Logger _logger = Logger.getLogger(QueueRunner.class);
private final SimpleAMQQueue _queue;
private static int IDLE = 0;
private static int SCHEDULED = 1;
private static int RUNNING = 2;
private final AtomicInteger _scheduled = new AtomicInteger(IDLE);
private final AtomicBoolean _stateChange = new AtomicBoolean();
private final AtomicLong _lastRunAgain = new AtomicLong();
private final AtomicLong _lastRunTime = new AtomicLong();
private long _continues;
public QueueRunner(SimpleAMQQueue queue)
{
_queue = queue;
}
public void run()
{
if(_scheduled.compareAndSet(SCHEDULED,RUNNING))
{
long runAgain = Long.MIN_VALUE;
_stateChange.set(false);
try
{
CurrentActor.set(_queue.getLogActor());
runAgain = _queue.processQueue(this);
}
catch (AMQException e)
{
_logger.error("Exception during asynchronous delivery by " + toString(), e);
}
finally
{
CurrentActor.remove();
}
_scheduled.compareAndSet(RUNNING, IDLE);
long stateChangeCount = _queue.getStateChangeCount();
_lastRunAgain.set(runAgain);
_lastRunTime.set(System.nanoTime());
if(runAgain == 0L || runAgain != stateChangeCount || _stateChange.compareAndSet(true,false))
{
_continues++;
if(_scheduled.compareAndSet(IDLE, SCHEDULED))
{
_queue.execute(this);
}
}
}
}
public String toString()
{
return "QueueRunner-" + _queue.getLogActor();
}
public void execute(Executor executor)
{
_stateChange.set(true);
if(_scheduled.compareAndSet(IDLE, SCHEDULED))
{
executor.execute(this);
}
}
public boolean isIdle()
{
return _scheduled.get() == IDLE;
}
}
|
