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
|
/*
*
* 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 "QueueContext.h"
#include "Multicaster.h"
#include "qpid/framing/ClusterQueueResubscribeBody.h"
#include "qpid/framing/ClusterQueueUnsubscribeBody.h"
#include "qpid/broker/Queue.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace cluster {
QueueContext::QueueContext(broker::Queue& q, Multicaster& m)
: owner(NOT_OWNER), count(0), queue(q), mcast(m)
{
QPID_LOG(debug, "Assign cluster context to queue " << q.getName());
q.stop(); // Initially stopped. Must all before setClusterContext
q.setClusterContext(boost::intrusive_ptr<QueueContext>(this));
}
// Called by QueueReplica in deliver thread.
void QueueContext::sharedOwner(size_t limit) {
QPID_LOG(critical, "FIXME QueueContext::sharedOwner " << queue.getName() << queue.getClusterContext().get());
sys::Mutex::ScopedLock l(lock);
count = limit;
if (owner == NOT_OWNER) queue.start(); // FIXME aconway 2011-06-09: ok inside mutex?
owner = SHARED_OWNER;
}
// Called by QueueReplica in deliver thread.
void QueueContext::soleOwner() {
QPID_LOG(critical, "FIXME QueueContext::soleOwner " << queue.getName() << queue.getClusterContext().get());
sys::Mutex::ScopedLock l(lock);
count = 0;
if (owner == NOT_OWNER) queue.start(); // FIXME aconway 2011-06-09: ok inside mutex?
owner = SOLE_OWNER;
}
// Called by BrokerContext in connection thread(s) on acquiring a message
void QueueContext::acquire() {
bool stop = false;
{
sys::Mutex::ScopedLock l(lock);
assert(owner != NOT_OWNER); // Can't acquire on a queue we don't own.
QPID_LOG(critical, "FIXME QueueContext::acquire " << queue.getName()
<< " owner=" << owner << " count=" << count);
if (owner == SHARED_OWNER) {
// Note count could be 0 if there are concurrent calls to acquire.
if (count && --count == 0) {
stop = true;
}
}
}
// FIXME aconway 2011-06-28: could have multiple stop() threads...
if (stop) queue.stop();
}
// Callback set up by queue.stop()
void QueueContext::stopped() {
sys::Mutex::ScopedLock l(lock);
if (owner == NOT_OWNER) {
mcast.mcast(framing::ClusterQueueUnsubscribeBody(
framing::ProtocolVersion(), queue.getName()));
} else {
owner = NOT_OWNER;
mcast.mcast(framing::ClusterQueueResubscribeBody(
framing::ProtocolVersion(), queue.getName()));
}
}
void QueueContext::unsubscribed() {
QPID_LOG(critical, "FIXME QueueContext unsubscribed, stopping " << queue.getName());
queue.stop();
sys::Mutex::ScopedLock l(lock);
owner = NOT_OWNER;
}
boost::intrusive_ptr<QueueContext> QueueContext::get(broker::Queue& q) {
return boost::intrusive_ptr<QueueContext>(
static_cast<QueueContext*>(q.getClusterContext().get()));
}
}} // namespace qpid::cluster
|
