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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 _Queue_
#define _Queue_
#include <vector>
#include <queue>
#include <boost/shared_ptr.hpp>
#include <qpid/framing/amqp_types.h>
#include <qpid/broker/Binding.h>
#include <qpid/broker/ConnectionToken.h>
#include <qpid/broker/Consumer.h>
#include <qpid/broker/Message.h>
#include <qpid/sys/Monitor.h>
namespace qpid {
namespace broker {
class MessageStore;
/**
* Thrown when exclusive access would be violated.
*/
struct ExclusiveAccessException{};
/**
* The brokers representation of an amqp queue. Messages are
* delivered to a queue from where they can be dispatched to
* registered consumers or be stored until dequeued or until one
* or more consumers registers.
*/
class Queue{
const string name;
const u_int32_t autodelete;
MessageStore* const store;
const ConnectionToken* const owner;
std::vector<Consumer*> consumers;
std::queue<Binding*> bindings;
std::queue<Message::shared_ptr> messages;
bool queueing;
bool dispatching;
int next;
mutable qpid::sys::Mutex lock;
int64_t lastUsed;
Consumer* exclusive;
mutable u_int64_t persistenceId;
bool startDispatching();
bool dispatch(Message::shared_ptr& msg);
public:
typedef boost::shared_ptr<Queue> shared_ptr;
typedef std::vector<shared_ptr> vector;
Queue(const string& name, u_int32_t autodelete = 0,
MessageStore* const store = 0,
const ConnectionToken* const owner = 0);
~Queue();
void create();
void destroy();
/**
* Informs the queue of a binding that should be cancelled on
* destruction of the queue.
*/
void bound(Binding* b);
/**
* Delivers a message to the queue. Will record it as
* enqueued if persistent then process it.
*/
void deliver(Message::shared_ptr& msg);
/**
* Dispatches the messages immediately to a consumer if
* one is available or stores it for later if not.
*/
void process(Message::shared_ptr& msg);
/**
* Used during recovery to add stored messages back to the queue
*/
void recover(Message::shared_ptr& msg);
/**
* Dispatch any queued messages providing there are
* consumers for them. Only one thread can be dispatching
* at any time, but this method (rather than the caller)
* is responsible for ensuring that.
*/
void dispatch();
void consume(Consumer* c, bool exclusive = false);
void cancel(Consumer* c);
Message::shared_ptr dequeue();
u_int32_t purge();
u_int32_t getMessageCount() const;
u_int32_t getConsumerCount() const;
inline const string& getName() const { return name; }
inline const bool isExclusiveOwner(const ConnectionToken* const o) const { return o == owner; }
inline bool hasExclusiveConsumer() const { return exclusive; }
inline u_int64_t getPersistenceId() const { return persistenceId; }
inline void setPersistenceId(u_int64_t _persistenceId) const { persistenceId = _persistenceId; }
bool canAutoDelete() const;
void enqueue(TransactionContext* ctxt, Message::shared_ptr& msg, const string * const xid);
void dequeue(TransactionContext* ctxt, Message::shared_ptr& msg, const string * const xid);
};
}
}
#endif
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