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
|
#ifndef QPID_CLUSTER_POLLABLEQUEUE_H
#define QPID_CLUSTER_POLLABLEQUEUE_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 "qpid/sys/PollableQueue.h"
#include <qpid/log/Statement.h>
namespace qpid {
namespace cluster {
/**
* More convenient version of PollableQueue that handles iterating
* over the batch and error handling.
*
* Constructed in "bypass" mode where items are processed directly
* rather than put on the queue. This is important for the
* PRE_INIT stage when Cluster is pumping CPG dispatch directly
* before the poller has started.
*
* Calling start() starts the pollable queue and disabled bypass mode.
*/
template <class T> class PollableQueue : public sys::PollableQueue<T> {
public:
typedef boost::function<void (const T&)> Callback;
typedef boost::function<void()> ErrorCallback;
PollableQueue(Callback f, ErrorCallback err, const std::string& msg,
const boost::shared_ptr<sys::Poller>& poller)
: sys::PollableQueue<T>(boost::bind(&PollableQueue<T>::handleBatch, this, _1),
poller),
callback(f), error(err), message(msg), bypass(true)
{}
typename sys::PollableQueue<T>::Batch::const_iterator
handleBatch(const typename sys::PollableQueue<T>::Batch& values) {
try {
typename sys::PollableQueue<T>::Batch::const_iterator i = values.begin();
while (i != values.end() && !this->isStopped()) {
callback(*i);
++i;
}
return i;
}
catch (const std::exception& e) {
QPID_LOG(critical, message << ": " << e.what());
this->stop();
error();
return values.end();
}
}
void push(const T& t) {
if (bypass) callback(t);
else sys::PollableQueue<T>::push(t);
}
void bypassOff() { bypass = false; }
private:
Callback callback;
ErrorCallback error;
std::string message;
bool bypass;
};
}} // namespace qpid::cluster
#endif /*!QPID_CLUSTER_POLLABLEQUEUE_H*/
|
