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
|
/**
* $RCSfile$
* $Revision: 2779 $
* $Date: 2005-09-05 17:00:45 -0300 (Mon, 05 Sep 2005) $
*
* Copyright 2003-2006 Jive Software.
*
* All rights reserved. Licensed 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.jivesoftware.smackx.muc;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.packet.Packet;
/**
* A variant of the {@link org.jivesoftware.smack.PacketCollector} class
* that does not force attachment to a <code>Connection</code>
* on creation and no filter is required. Used to collect message
* packets targeted to a group chat room.
*
* @author Larry Kirschner
*/
class ConnectionDetachedPacketCollector {
/**
* Max number of packets that any one collector can hold. After the max is
* reached, older packets will be automatically dropped from the queue as
* new packets are added.
*/
private int maxPackets = SmackConfiguration.getPacketCollectorSize();
private ArrayBlockingQueue<Packet> resultQueue;
/**
* Creates a new packet collector. If the packet filter is <tt>null</tt>, then
* all packets will match this collector.
*/
public ConnectionDetachedPacketCollector() {
this(SmackConfiguration.getPacketCollectorSize());
}
/**
* Creates a new packet collector. If the packet filter is <tt>null</tt>, then
* all packets will match this collector.
*/
public ConnectionDetachedPacketCollector(int maxSize) {
this.resultQueue = new ArrayBlockingQueue<Packet>(maxSize);
}
/**
* Polls to see if a packet is currently available and returns it, or
* immediately returns <tt>null</tt> if no packets are currently in the
* result queue.
*
* @return the next packet result, or <tt>null</tt> if there are no more
* results.
*/
public Packet pollResult() {
return resultQueue.poll();
}
/**
* Returns the next available packet. The method call will block (not return)
* until a packet is available.
*
* @return the next available packet.
*/
public Packet nextResult() {
try {
return resultQueue.take();
}
catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
/**
* Returns the next available packet. The method call will block (not return)
* until a packet is available or the <tt>timeout</tt> has elapased. If the
* timeout elapses without a result, <tt>null</tt> will be returned.
*
* @param timeout the amount of time to wait for the next packet (in milleseconds).
* @return the next available packet.
*/
public Packet nextResult(long timeout) {
try {
return resultQueue.poll(timeout, TimeUnit.MILLISECONDS);
}
catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
/**
* Processes a packet to see if it meets the criteria for this packet collector.
* If so, the packet is added to the result queue.
*
* @param packet the packet to process.
*/
protected void processPacket(Packet packet) {
if (packet == null) {
return;
}
while (!resultQueue.offer(packet)) {
// Since we know the queue is full, this poll should never actually block.
resultQueue.poll();
}
}
}
|
