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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
*
* 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.state;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.*;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.handler.*;
import org.apache.qpid.server.protocol.AMQMethodEvent;
import org.apache.qpid.server.protocol.AMQMethodListener;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.log4j.Logger;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* The state manager is responsible for managing the state of the protocol session.
* <p/>
* For each AMQProtocolHandler there is a separate state manager.
*
*/
public class AMQStateManager implements AMQMethodListener
{
private static final Logger _logger = Logger.getLogger(AMQStateManager.class);
/**
* The current state
*/
private AMQState _currentState;
/**
* Maps from an AMQState instance to a Map from Class to StateTransitionHandler.
* The class must be a subclass of AMQFrame.
*/
private final Map<AMQState, Map<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>> _state2HandlersMap =
new HashMap<AMQState, Map<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>>();
private CopyOnWriteArraySet<StateListener> _stateListeners = new CopyOnWriteArraySet<StateListener>();
public AMQStateManager()
{
this(AMQState.CONNECTION_NOT_STARTED, true);
}
protected AMQStateManager(AMQState initial, boolean register)
{
_currentState = initial;
if (register)
{
registerListeners();
}
}
protected void registerListeners()
{
Map<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>> frame2handlerMap =
new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
// we need to register a map for the null (i.e. all state) handlers otherwise you get
// a stack overflow in the handler searching code when you present it with a frame for which
// no handlers are registered
//
_state2HandlersMap.put(null, frame2handlerMap);
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ConnectionStartOkBody.class, ConnectionStartOkMethodHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_NOT_STARTED, frame2handlerMap);
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ConnectionSecureOkBody.class, ConnectionSecureOkMethodHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_NOT_AUTH, frame2handlerMap);
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ConnectionTuneOkBody.class, ConnectionTuneOkMethodHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_NOT_TUNED, frame2handlerMap);
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ConnectionOpenBody.class, ConnectionOpenMethodHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_NOT_OPENED, frame2handlerMap);
//
// ConnectionOpen handlers
//
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ChannelOpenBody.class, ChannelOpenHandler.getInstance());
frame2handlerMap.put(ChannelCloseBody.class, ChannelCloseHandler.getInstance());
frame2handlerMap.put(ChannelCloseOkBody.class, ChannelCloseOkHandler.getInstance());
frame2handlerMap.put(ConnectionCloseBody.class, ConnectionCloseMethodHandler.getInstance());
frame2handlerMap.put(ExchangeDeclareBody.class, ExchangeDeclareHandler.getInstance());
frame2handlerMap.put(ExchangeDeleteBody.class, ExchangeDeleteHandler.getInstance());
frame2handlerMap.put(ExchangeBoundBody.class, ExchangeBoundHandler.getInstance());
frame2handlerMap.put(BasicAckBody.class, BasicAckMethodHandler.getInstance());
frame2handlerMap.put(BasicRecoverBody.class, BasicRecoverMethodHandler.getInstance());
frame2handlerMap.put(BasicConsumeBody.class, BasicConsumeMethodHandler.getInstance());
frame2handlerMap.put(BasicCancelBody.class, BasicCancelMethodHandler.getInstance());
frame2handlerMap.put(BasicPublishBody.class, BasicPublishMethodHandler.getInstance());
frame2handlerMap.put(BasicQosBody.class, BasicQosHandler.getInstance());
frame2handlerMap.put(QueueBindBody.class, QueueBindHandler.getInstance());
frame2handlerMap.put(QueueDeclareBody.class, QueueDeclareHandler.getInstance());
frame2handlerMap.put(QueueDeleteBody.class, QueueDeleteHandler.getInstance());
frame2handlerMap.put(ChannelFlowBody.class, ChannelFlowHandler.getInstance());
frame2handlerMap.put(TxSelectBody.class, TxSelectHandler.getInstance());
frame2handlerMap.put(TxCommitBody.class, TxCommitHandler.getInstance());
frame2handlerMap.put(TxRollbackBody.class, TxRollbackHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_OPEN, frame2handlerMap);
frame2handlerMap = new HashMap<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>();
frame2handlerMap.put(ConnectionCloseOkBody.class, ConnectionCloseOkMethodHandler.getInstance());
_state2HandlersMap.put(AMQState.CONNECTION_CLOSING, frame2handlerMap);
}
public AMQState getCurrentState()
{
return _currentState;
}
public void changeState(AMQState newState) throws AMQException
{
_logger.debug("State changing to " + newState + " from old state " + _currentState);
final AMQState oldState = _currentState;
_currentState = newState;
for (StateListener l : _stateListeners)
{
l.stateChanged(oldState, newState);
}
}
public void error(AMQException e)
{
_logger.error("State manager received error notification: " + e, e);
for (StateListener l : _stateListeners)
{
l.error(e);
}
}
public <B extends AMQMethodBody> boolean methodReceived(AMQMethodEvent<B> evt,
AMQProtocolSession protocolSession,
QueueRegistry queueRegistry,
ExchangeRegistry exchangeRegistry) throws AMQException
{
StateAwareMethodListener<B> handler = findStateTransitionHandler(_currentState, evt.getMethod());
if (handler != null)
{
handler.methodReceived(this, queueRegistry, exchangeRegistry, protocolSession, evt);
return true;
}
return false;
}
protected <B extends AMQMethodBody> StateAwareMethodListener<B> findStateTransitionHandler(AMQState currentState,
B frame)
throws IllegalStateTransitionException
{
if (_logger.isDebugEnabled())
{
_logger.debug("Looking for state transition handler for frame " + frame.getClass());
}
final Map<Class<? extends AMQMethodBody>, StateAwareMethodListener<? extends AMQMethodBody>>
classToHandlerMap = _state2HandlersMap.get(currentState);
if (classToHandlerMap == null)
{
// if no specialised per state handler is registered look for a
// handler registered for "all" states
return findStateTransitionHandler(null, frame);
}
final StateAwareMethodListener<B> handler = (StateAwareMethodListener<B>) classToHandlerMap.get(frame.getClass());
if (handler == null)
{
if (currentState == null)
{
_logger.debug("No state transition handler defined for receiving frame " + frame);
return null;
}
else
{
// if no specialised per state handler is registered look for a
// handler registered for "all" states
return findStateTransitionHandler(null, frame);
}
}
else
{
return handler;
}
}
public void addStateListener(StateListener listener)
{
_logger.debug("Adding state listener");
_stateListeners.add(listener);
}
public void removeStateListener(StateListener listener)
{
_stateListeners.remove(listener);
}
}
|
