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
|
/*
*
* 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 <iostream>
#include <boost/bind.hpp>
#include <boost/ptr_container/ptr_vector.hpp>
#include "TestOptions.h"
#include "qpid/client/AsyncSession.h"
#include "qpid/client/FailoverManager.h"
#include "qpid/client/Message.h"
#include "qpid/client/SubscriptionManager.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Thread.h"
using namespace qpid::client;
using namespace qpid::sys;
struct Args : public qpid::TestOptions
{
string workQueue;
size_t workers;
Args() : workQueue("txshift-control"), workers(1)
{
addOptions()
("workers", qpid::optValue(workers, "N"), "Number of separate worker sessions to start")
("work-queue", qpid::optValue(workQueue, "NAME"), "work queue from which to take instructions");
}
};
struct Transfer : MessageListener
{
std::string control;
std::string source;
std::string destination;
uint expected;
uint transfered;
SubscriptionSettings controlSettings;
Subscription controlSubscription;
SubscriptionSettings sourceSettings;
Subscription sourceSubscription;
Transfer(const std::string control_) : control(control_), expected(0), transfered(0) {}
void subscribeToSource(SubscriptionManager& manager)
{
sourceSettings.autoAck = 0;//will accept once at the end of the batch
sourceSettings.flowControl = FlowControl::messageCredit(expected);
sourceSubscription = manager.subscribe(*this, source, sourceSettings);
QPID_LOG(info, "Subscribed to source: " << source << " expecting: " << expected);
}
void subscribeToControl(SubscriptionManager& manager)
{
controlSettings.flowControl = FlowControl::messageCredit(1);
controlSubscription = manager.subscribe(*this, control, controlSettings);
QPID_LOG(info, "Subscribed to job queue");
}
void received(Message& message)
{
QPID_LOG(debug, "received: " << message.getData() << " for " << message.getDestination());
if (message.getDestination() == source) {
receivedFromSource(message);
} else if (message.getDestination() == control) {
receivedFromControl(message);
} else {
QPID_LOG(error, "Unexpected message: " << message.getData() << " to " << message.getDestination());
}
}
void receivedFromSource(Message& message)
{
QPID_LOG(debug, "transfering " << (transfered+1) << " of " << expected);
message.getDeliveryProperties().setRoutingKey(destination);
async(sourceSubscription.getSession()).messageTransfer(arg::content=message);
if (++transfered == expected) {
QPID_LOG(info, "completed job: " << transfered << " messages shifted from " <<
source << " to " << destination);
sourceSubscription.accept(sourceSubscription.getUnaccepted());
sourceSubscription.getSession().txCommit();
sourceSubscription.cancel();
//grant credit to allow broker to send us another control message
controlSubscription.grantMessageCredit(1);
}
}
void receivedFromControl(Message& message)
{
if (message.getData() == "transfer") {
source = message.getHeaders().getAsString("src");
destination = message.getHeaders().getAsString("dest");
expected = message.getHeaders().getAsInt("count");
transfered = 0;
QPID_LOG(info, "received transfer request: " << expected << " messages to be shifted from " <<
source << " to " << destination);
subscribeToSource(controlSubscription.getSubscriptionManager());
} else if (message.getData() == "quit") {
QPID_LOG(info, "received quit request");
controlSubscription.cancel();
} else {
std::cerr << "Rejecting invalid message: " << message.getData() << std::endl;
controlSubscription.getSession().messageReject(SequenceSet(message.getId()));
}
}
};
struct Worker : FailoverManager::Command, Runnable
{
FailoverManager& connection;
Transfer transfer;
Thread runner;
Worker(FailoverManager& c, const std::string& controlQueue) : connection(c), transfer(controlQueue) {}
void run()
{
connection.execute(*this);
}
void start()
{
runner = Thread(this);
}
void join()
{
runner.join();
}
void execute(AsyncSession& session, bool isRetry)
{
if (isRetry) QPID_LOG(info, "Retrying...");
session.txSelect();
SubscriptionManager subs(session);
transfer.subscribeToControl(subs);
subs.run();
session.txCommit();//commit accept of control messages
}
};
int main(int argc, char** argv)
{
Args opts;
try {
opts.parse(argc, argv);
FailoverManager connection(opts.con);
connection.connect();
if (opts.workers == 1) {
Worker worker(connection, opts.workQueue);
worker.run();
} else {
boost::ptr_vector<Worker> workers;
for (size_t i = 0; i < opts.workers; i++) {
workers.push_back(new Worker(connection, opts.workQueue));
}
for_each(workers.begin(), workers.end(), boost::bind(&Worker::start, _1));
for_each(workers.begin(), workers.end(), boost::bind(&Worker::join, _1));
}
return 0;
} catch(const std::exception& e) {
std::cout << e.what() << std::endl;
return 1;
}
}
|
