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#ifndef _broker_Queue_h
#define _broker_Queue_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 <vector>
#include <memory>
#include <deque>
#include <boost/shared_ptr.hpp>
#include "qpid/framing/amqp_types.h"
#include "ConnectionToken.h"
#include "Consumer.h"
#include "Message.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/sys/Serializer.h"
#include "qpid/sys/Monitor.h"
#include "PersistableQueue.h"
#include "QueuePolicy.h"
#include "QueueBindings.h"
// TODO aconway 2007-02-06: Use auto_ptr and boost::ptr_vector to
// enforce ownership of Consumers.
namespace qpid {
namespace broker {
class MessageStore;
class QueueRegistry;
class TransactionContext;
class Exchange;
using std::string;
/**
* 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 : public PersistableQueue{
typedef std::vector<Consumer*> Consumers;
typedef std::deque<QueuedMessage> Messages;
struct DispatchFunctor {
Queue& queue;
DispatchFunctor(Queue& q) : queue(q) {}
void operator()() { queue.dispatch(); }
};
const string name;
const bool autodelete;
MessageStore* const store;
const ConnectionToken* owner;
Consumers acquirers;
Consumers browsers;
Messages messages;
int next;
mutable qpid::sys::RWlock consumerLock;
mutable qpid::sys::Mutex messageLock;
Consumer* exclusive;
mutable uint64_t persistenceId;
framing::FieldTable settings;
std::auto_ptr<QueuePolicy> policy;
QueueBindings bindings;
boost::shared_ptr<Exchange> alternateExchange;
qpid::sys::Serializer<DispatchFunctor> serializer;
DispatchFunctor dispatchCallback;
framing::SequenceNumber sequence;
void pop();
void push(Message::shared_ptr& msg);
bool dispatch(QueuedMessage& msg);
void setPolicy(std::auto_ptr<QueuePolicy> policy);
/**
* only called by serilizer
*/
void dispatch();
void cancel(Consumer* c, Consumers& set);
void serviceBrowser(Consumer* c);
protected:
/**
* Call back from store
*/
virtual void notifyDurableIOComplete();
public:
typedef boost::shared_ptr<Queue> shared_ptr;
typedef std::vector<shared_ptr> vector;
Queue(const string& name, bool autodelete = false,
MessageStore* const store = 0,
const ConnectionToken* const owner = 0);
~Queue();
void create(const qpid::framing::FieldTable& settings);
void configure(const qpid::framing::FieldTable& settings);
void destroy();
void bound(const string& exchange, const string& key, const qpid::framing::FieldTable& args);
void unbind(ExchangeRegistry& exchanges, Queue::shared_ptr shared_ref);
bool acquire(const QueuedMessage& msg);
/**
* 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);
/**
* Returns a message to the in-memory queue (due to lack
* of acknowledegement from a receiver). If a consumer is
* available it will be dispatched immediately, else it
* will be returned to the front of the queue.
*/
void requeue(const QueuedMessage& msg);
/**
* Used during recovery to add stored messages back to the queue
*/
void recover(Message::shared_ptr& msg);
/**
* Request dispatch any queued messages providing there are
* consumers for them. Only one thread can be dispatching
* at any time, so this call schedules the despatch based on
* the serilizer policy.
*/
void requestDispatch(Consumer* c = 0, bool sync = false);
void consume(Consumer* c, bool exclusive = false);
void cancel(Consumer* c);
uint32_t purge();
uint32_t getMessageCount() const;
uint32_t getConsumerCount() const;
inline const string& getName() const { return name; }
inline const bool isExclusiveOwner(const ConnectionToken* const o) const { return o == owner; }
inline void releaseExclusiveOwnership() { owner = 0; }
inline void setExclusiveOwner(const ConnectionToken* const o) { owner = o; }
inline bool hasExclusiveConsumer() const { return exclusive; }
inline bool hasExclusiveOwner() const { return owner != 0; }
inline bool isDurable() const { return store != 0; }
inline const framing::FieldTable& getSettings() const { return settings; }
inline bool isAutoDelete() const { return autodelete; }
bool canAutoDelete() const;
bool enqueue(TransactionContext* ctxt, Message::shared_ptr& msg);
/**
* dequeue from store (only done once messages is acknowledged)
*/
bool dequeue(TransactionContext* ctxt, Message::shared_ptr& msg);
/**
* dequeues from memory only
*/
QueuedMessage dequeue();
const QueuePolicy* const getPolicy();
void setAlternateExchange(boost::shared_ptr<Exchange> exchange);
boost::shared_ptr<Exchange> getAlternateExchange();
//PersistableQueue support:
uint64_t getPersistenceId() const;
void setPersistenceId(uint64_t persistenceId) const;
void encode(framing::Buffer& buffer) const;
uint32_t encodedSize() const;
static Queue::shared_ptr decode(QueueRegistry& queues, framing::Buffer& buffer);
};
}
}
#endif /*!_broker_Queue_h*/
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