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/*
*
* 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.
*
*/
#ifndef _QueueRegistry_
#define _QueueRegistry_
#include "qpid/broker/BrokerImportExport.h"
#include "qpid/sys/Mutex.h"
#include "qpid/management/Manageable.h"
#include "qpid/framing/FieldTable.h"
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <algorithm>
#include <map>
namespace qpid {
namespace broker {
class Queue;
class QueueEvents;
class Exchange;
class OwnershipToken;
class Broker;
class MessageStore;
/**
* A registry of queues indexed by queue name.
*
* Queues are reference counted using shared_ptr to ensure that they
* are deleted when and only when they are no longer in use.
*
*/
class QueueRegistry {
public:
QPID_BROKER_EXTERN QueueRegistry(Broker* b = 0);
QPID_BROKER_EXTERN ~QueueRegistry();
/**
* Declare a queue.
*
* @return The queue and a boolean flag which is true if the queue
* was created by this declare call false if it already existed.
*/
QPID_BROKER_EXTERN std::pair<boost::shared_ptr<Queue>, bool> declare(
const std::string& name,
bool durable = false,
bool autodelete = false,
const OwnershipToken* owner = 0,
boost::shared_ptr<Exchange> alternateExchange = boost::shared_ptr<Exchange>(),
const qpid::framing::FieldTable& args = framing::FieldTable(),
bool recovering = false);
/**
* Destroy the named queue.
*
* Note: if the queue is in use it is not actually destroyed until
* all shared_ptrs to it are destroyed. During that time it is
* possible that a new queue with the same name may be
* created. This should not create any problems as the new and
* old queues exist independently. The registry has
* forgotten the old queue so there can be no confusion for
* subsequent calls to find or declare with the same name.
*
*/
QPID_BROKER_EXTERN void destroy(const std::string& name);
template <class Test> bool destroyIf(const std::string& name, Test test)
{
qpid::sys::RWlock::ScopedWlock locker(lock);
if (test()) {
destroyLH (name);
return true;
} else {
return false;
}
}
/**
* Find the named queue. Return 0 if not found.
*/
QPID_BROKER_EXTERN boost::shared_ptr<Queue> find(const std::string& name);
/**
* Generate unique queue name.
*/
std::string generateName();
/**
* Set the store to use. May only be called once.
*/
void setStore (MessageStore*);
/**
* Return the message store used.
*/
MessageStore* getStore() const;
/**
* Register the manageable parent for declared queues
*/
void setParent (management::Manageable* _parent) { parent = _parent; }
/** Call f for each queue in the registry. */
template <class F> void eachQueue(F f) const {
qpid::sys::RWlock::ScopedRlock l(lock);
for (QueueMap::const_iterator i = queues.begin(); i != queues.end(); ++i)
f(i->second);
}
/**
* Change queue mode when cluster size drops to 1 node, expands again
* in practice allows flow queue to disk when last name to be exectuted
*/
void updateQueueClusterState(bool lastNode);
private:
typedef std::map<std::string, boost::shared_ptr<Queue> > QueueMap;
QueueMap queues;
mutable qpid::sys::RWlock lock;
int counter;
MessageStore* store;
QueueEvents* events;
management::Manageable* parent;
bool lastNode; //used to set mode on queue declare
Broker* broker;
//destroy impl that assumes lock is already held:
void destroyLH (const std::string& name);
};
}} // namespace qpid::broker
#endif
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