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#ifndef QPID_HA_PRIMARYQUEUELIMITS_H
#define QPID_HA_PRIMARYQUEUELIMITS_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 "ReplicationTest.h"
#include <qpid/broker/Queue.h>
#include <qpid/broker/QueueRegistry.h>
#include <qpid/framing/amqp_types.h>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <string>
namespace qpid {
namespace broker {
class Queue;
}
namespace ha {
class LogPrefix;
class RemoteBackup;
/**
* Track queue limits on the primary, ensure the primary does not attempt to
* replicate more queues than the backups can handle.
*
* THREAD UNSAFE: Protected by Primary::lock
*/
class PrimaryQueueLimits
{
public:
// FIXME aconway 2014-01-24: hardcoded maxQueues, use negotiated channel-max
PrimaryQueueLimits(const LogPrefix& lp,
broker::QueueRegistry& qr,
const ReplicationTest& rt
) :
logPrefix(lp), maxQueues(framing::CHANNEL_MAX-100), queues(0)
{
// Get initial count of replicated queues
qr.eachQueue(boost::bind(&PrimaryQueueLimits::addQueueIfReplicated, this, _1, rt));
}
/** Add a replicated queue
*@exception ResourceLimitExceededException if this would exceed the limit.
*/
void addQueue(const boost::shared_ptr<broker::Queue>& q) {
if (queues >= maxQueues) {
QPID_LOG(error, logPrefix << "Cannot create replicated queue " << q->getName()
<< " exceeds limit of " << maxQueues
<< " replicated queues.");
throw framing::ResourceLimitExceededException(
Msg() << "Exceeded replicated queue limit " << queues << " >= " << maxQueues);
}
else ++queues;
}
void addQueueIfReplicated(const boost::shared_ptr<broker::Queue>& q, const ReplicationTest& rt) {
if(rt.useLevel(*q)) addQueue(q);
}
/** Remove a replicated queue.
* @pre Was previously added with addQueue
*/
void removeQueue(const boost::shared_ptr<broker::Queue>&) {
assert(queues != 0);
--queues;
}
// TODO aconway 2014-01-24: Currently replication links always use the
// hard-coded framing::CHANNEL_MAX. In future (e.g. when we support AMQP1.0
// on replication links) we may need to check the actual channel max on each
// link and update maxQueues to the smallest value. addBackup and removeBackup
// are placeholders for that.
/** Add a backup */
void addBackup(const boost::shared_ptr<RemoteBackup>&) {}
/** Remove a backup */
void removeBackup(const boost::shared_ptr<RemoteBackup>&) {}
private:
const LogPrefix& logPrefix;
uint64_t maxQueues;
uint64_t queues;
};
}} // namespace qpid::ha
#endif /*!QPID_HA_PRIMARYQUEUELIMITS_H*/
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