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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 _Channel_
#define _Channel_
#include <algorithm>
#include <map>
#include "AMQContentBody.h"
#include "AMQHeaderBody.h"
#include "BasicPublishBody.h"
#include "Binding.h"
#include "Consumer.h"
#include "Message.h"
#include "MonitorImpl.h"
#include "NameGenerator.h"
#include "OutputHandler.h"
#include "Queue.h"
namespace qpid {
namespace broker {
/**
* Maintains state for an AMQP channel. Handles incoming and
* outgoing messages for that channel.
*/
class Channel{
private:
class ConsumerImpl : public virtual Consumer{
Channel* parent;
string tag;
Queue::shared_ptr queue;
ConnectionToken* const connection;
const bool ackExpected;
bool blocked;
public:
ConsumerImpl(Channel* parent, string& tag, Queue::shared_ptr queue, ConnectionToken* const connection, bool ack);
virtual bool deliver(Message::shared_ptr& msg);
void cancel();
void requestDispatch();
};
typedef std::map<string,ConsumerImpl*>::iterator consumer_iterator;
struct AckRecord{
Message::shared_ptr msg;
Queue::shared_ptr queue;
string consumerTag;
u_int64_t deliveryTag;
bool pull;
AckRecord(Message::shared_ptr _msg,
Queue::shared_ptr _queue,
const string _consumerTag,
const u_int64_t _deliveryTag) : msg(_msg),
queue(_queue),
consumerTag(_consumerTag),
deliveryTag(_deliveryTag),
pull(false){}
AckRecord(Message::shared_ptr _msg,
Queue::shared_ptr _queue,
const u_int64_t _deliveryTag) : msg(_msg),
queue(_queue),
consumerTag(""),
deliveryTag(_deliveryTag),
pull(true){}
};
typedef std::vector<AckRecord>::iterator ack_iterator;
class MatchAck{
const u_int64_t tag;
public:
MatchAck(u_int64_t tag);
bool operator()(AckRecord& record) const;
};
class Requeue{
public:
void operator()(AckRecord& record) const;
};
class Redeliver{
Channel* const channel;
public:
Redeliver(Channel* const channel);
void operator()(AckRecord& record) const;
};
class CalculatePrefetch{
u_int32_t size;
u_int16_t count;
public:
CalculatePrefetch();
void operator()(AckRecord& record);
u_int32_t getSize();
u_int16_t getCount();
};
const int id;
qpid::framing::OutputHandler* out;
u_int64_t deliveryTag;
Queue::shared_ptr defaultQueue;
bool transactional;
std::map<string, ConsumerImpl*> consumers;
u_int32_t prefetchSize;
u_int16_t prefetchCount;
u_int32_t outstandingSize;
u_int16_t outstandingCount;
u_int32_t framesize;
Message::shared_ptr message;
NameGenerator tagGenerator;
std::vector<AckRecord> unacknowledged;
qpid::concurrent::MonitorImpl deliveryLock;
void deliver(Message::shared_ptr& msg, string& tag, Queue::shared_ptr& queue, bool ackExpected);
void checkMessage(const std::string& text);
bool checkPrefetch(Message::shared_ptr& msg);
void cancel(consumer_iterator consumer);
template<class Operation> Operation processMessage(Operation route){
if(message->isComplete()){
route(message);
message.reset();
}
return route;
}
public:
Channel(qpid::framing::OutputHandler* out, int id, u_int32_t framesize);
~Channel();
inline void setDefaultQueue(Queue::shared_ptr queue){ defaultQueue = queue; }
inline Queue::shared_ptr getDefaultQueue(){ return defaultQueue; }
inline u_int32_t setPrefetchSize(u_int32_t size){ return prefetchSize = size; }
inline u_int16_t setPrefetchCount(u_int16_t count){ return prefetchCount = count; }
bool exists(const string& consumerTag);
void consume(string& tag, Queue::shared_ptr queue, bool acks, bool exclusive, ConnectionToken* const connection = 0);
void cancel(const string& tag);
bool get(Queue::shared_ptr queue, bool ackExpected);
void begin();
void close();
void commit();
void rollback();
void ack(u_int64_t deliveryTag, bool multiple);
void recover(bool requeue);
/**
* Handles the initial publish request though a
* channel. The header and (if applicable) content will be
* accumulated through calls to handleHeader() and
* handleContent()
*/
void handlePublish(Message* msg);
/**
* A template method that handles a received header and if
* there is no content routes it using the functor passed
* in.
*/
template<class Operation> Operation handleHeader(qpid::framing::AMQHeaderBody::shared_ptr header, Operation route){
checkMessage("Invalid message sequence: got header before publish.");
message->setHeader(header);
return processMessage(route);
}
/**
* A template method that handles a received content and
* if this completes the message, routes it using the
* functor passed in.
*/
template<class Operation> Operation handleContent(qpid::framing::AMQContentBody::shared_ptr content, Operation route){
checkMessage("Invalid message sequence: got content before publish.");
message->addContent(content);
return processMessage(route);
}
};
struct InvalidAckException{};
}
}
#endif
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