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#ifndef QPID_BROKER_AMQP1_OUTGOING_H
#define QPID_BROKER_AMQP1_OUTGOING_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 "qpid/broker/amqp/Message.h"
#include "qpid/broker/amqp/ManagedOutgoingLink.h"
#include "qpid/broker/Consumer.h"
#include "qpid/broker/QueueObserver.h"
#include <boost/shared_ptr.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
extern "C" {
#include <proton/engine.h>
}
namespace qpid {
namespace sys {
class OutputControl;
}
namespace framing {
class SequenceSet;
}
namespace broker {
class Broker;
class Queue;
class Selector;
namespace amqp {
class Session;
template <class T>
class CircularArray
{
public:
CircularArray(size_t l) : limit(l), data(new T[limit]) {}
T& operator[](size_t i) { return data[i]; }
size_t capacity() { return limit; }
~CircularArray() { delete [] data; }
private:
const size_t limit;
T* const data;
size_t next;
};
class Outgoing : public ManagedOutgoingLink
{
public:
Outgoing(Broker& broker, Session& parent, const std::string& source, const std::string& target, const std::string& name);
virtual void setSubjectFilter(const std::string&) = 0;
virtual void setSelectorFilter(const std::string&) = 0;
virtual void init() = 0;
/**
* Allows the link to initiate any outgoing transfers
*/
virtual bool doWork() = 0;
/**
* Signals that this link has been detached
*/
virtual void detached(bool closed) = 0;
/**
* Called when a delivery is writable
*/
virtual void handle(pn_delivery_t* delivery) = 0;
void wakeup();
virtual ~Outgoing() {}
protected:
Session& session;
};
/**
* Logic for handling an outgoing link from a queue (even if it is a
* subscription pseduo-queue created by the broker)
*/
class OutgoingFromQueue : public Outgoing, public qpid::broker::Consumer,
public boost::enable_shared_from_this<OutgoingFromQueue>,
public qpid::broker::QueueObserver
{
public:
OutgoingFromQueue(Broker&, const std::string& source, const std::string& target, boost::shared_ptr<Queue> q, pn_link_t* l, Session&,
qpid::sys::OutputControl& o, SubscriptionType type, bool exclusive, bool isControllingUser);
~OutgoingFromQueue();
void setSubjectFilter(const std::string&);
void setSelectorFilter(const std::string&);
void init();
bool doWork();
void write(const char* data, size_t size);
void handle(pn_delivery_t* delivery);
bool canDeliver();
void detached(bool closed);
// Consumer interface:
bool deliver(const QueueCursor& cursor, const qpid::broker::Message& msg);
void notify();
bool accept(const qpid::broker::Message&);
bool filter(const qpid::broker::Message&);
void cancel();
void acknowledged(const qpid::broker::DeliveryRecord&);
qpid::broker::OwnershipToken* getSession();
static boost::shared_ptr<Queue> getExclusiveSubscriptionQueue(Outgoing*);
// QueueObserver interface
virtual void enqueued(const qpid::broker::Message&) {};
virtual void acquired(const qpid::broker::Message&) {};
virtual void requeued(const qpid::broker::Message&) {};
virtual void dequeued(const qpid::broker::Message&);
virtual void consumerAdded(const qpid::broker::Consumer&) {};
virtual void consumerRemoved(const qpid::broker::Consumer&) {};
private:
struct Record
{
QueueCursor cursor;
qpid::broker::Message msg;
pn_delivery_t* delivery;
int disposition;
size_t index;
pn_delivery_tag_t tag;
//The delivery tag is a 4 byte value representing the
//index. It is encoded separately to avoid alignment issues.
//The number of deliveries held here is always strictly
//bounded, so 4 bytes is more than enough.
static const size_t TAG_WIDTH = sizeof(uint32_t);
char tagData[TAG_WIDTH];
Record();
void init(size_t i);
void reset();
static size_t getIndex(pn_delivery_tag_t);
};
const bool exclusive;
const bool isControllingUser;
boost::shared_ptr<Queue> queue;
CircularArray<Record> deliveries;
pn_link_t* link;
qpid::sys::OutputControl& out;
size_t current;
std::vector<char> buffer;
std::string subjectFilter;
boost::scoped_ptr<Selector> selector;
bool unreliable;
bool cancelled;
bool trackingUndeliverableMessages;
qpid::framing::SequenceSet undeliverableMessages;
};
}}} // namespace qpid::broker::amqp
#endif /*!QPID_BROKER_AMQP1_OUTGOING_H*/
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