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
|
#ifndef QPID_HA_QUEUEREPLICATOR_H
#define QPID_HA_QUEUEREPLICATOR_H
/*
*
* 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.
*
*/
#include "BrokerInfo.h"
#include "hash.h"
#include "qpid/broker/Exchange.h"
#include <boost/enable_shared_from_this.hpp>
#include <boost/function.hpp>
#include <iosfwd>
namespace qpid {
namespace broker {
class Bridge;
class Link;
class Queue;
class QueueRegistry;
class SessionHandler;
class Deliverable;
class ExchangeRegistry;
}
namespace ha {
class HaBroker;
class Settings;
/**
* Exchange created on a backup broker to replicate a queue on the primary.
*
* Puts replicated messages on the local queue, handles dequeue events.
* Creates a ReplicatingSubscription on the primary by passing special
* arguments to the consume command.
*
* THREAD SAFE: Called in different connection threads.
*/
class QueueReplicator : public broker::Exchange,
public boost::enable_shared_from_this<QueueReplicator>
{
public:
static const std::string QPID_SYNC_FREQUENCY;
static const std::string REPLICATOR_PREFIX;
typedef std::vector<boost::shared_ptr<QueueReplicator> > Vector;
static std::string replicatorName(const std::string& queueName);
static bool isReplicatorName(const std::string&);
/*** Copy QueueReplicators from the registry */
static void copy(broker::ExchangeRegistry&, Vector& result);
static boost::shared_ptr<QueueReplicator> create(
HaBroker&, boost::shared_ptr<broker::Queue> q, boost::shared_ptr<broker::Link> l);
~QueueReplicator();
void disconnect(); // Called when we are disconnected from the primary.
std::string getType() const;
void route(broker::Deliverable&);
// Set if the queue has ever been subscribed to, used for auto-delete cleanup.
void setSubscribed() { subscribed = true; }
boost::shared_ptr<broker::Queue> getQueue() const { return queue; }
// No-op unused Exchange virtual functions.
bool bind(boost::shared_ptr<broker::Queue>, const std::string&, const framing::FieldTable*);
bool unbind(boost::shared_ptr<broker::Queue>, const std::string&, const framing::FieldTable*);
bool isBound(boost::shared_ptr<broker::Queue>, const std::string* const, const framing::FieldTable* const);
bool hasBindings();
void promoted();
protected:
typedef boost::function<void(const std::string&, sys::Mutex::ScopedLock&)> DispatchFn;
typedef qpid::sys::unordered_map<std::string, DispatchFn> DispatchMap;
QueueReplicator(
HaBroker&, boost::shared_ptr<broker::Queue>, boost::shared_ptr<broker::Link>);
void initialize(); // Called as part of create()
virtual void deliver(const broker::Message&);
virtual void destroy(); // Called when the queue is destroyed.
sys::Mutex lock;
HaBroker& haBroker;
const BrokerInfo brokerInfo;
DispatchMap dispatch;
boost::shared_ptr<broker::Link> link;
boost::shared_ptr<broker::Bridge> bridge;
boost::shared_ptr<broker::Queue> queue;
broker::SessionHandler* sessionHandler;
private:
typedef qpid::sys::unordered_map<
ReplicationId, QueuePosition, Hasher<ReplicationId> > PositionMap;
class ErrorListener;
class QueueObserver;
void initializeBridge(broker::Bridge& bridge, broker::SessionHandler& sessionHandler);
// Dispatch functions
void dequeueEvent(const std::string& data, sys::Mutex::ScopedLock&);
void idEvent(const std::string& data, sys::Mutex::ScopedLock&);
void incomingExecutionException(framing::execution::ErrorCode e,
const std::string& msg);
std::string logPrefix;
std::string bridgeName;
bool subscribed;
const Settings& settings;
PositionMap positions;
ReplicationIdSet idSet; // Set of replicationIds on the queue.
ReplicationId nextId; // ID for next message to arrive.
ReplicationId maxId; // Max ID used so far.
friend class ErrorListener;
};
}} // namespace qpid::ha
#endif /*!QPID_HA_QUEUEREPLICATOR_H*/
|
