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#ifndef _broker_MessageGroupManager_h
#define _broker_MessageGroupManager_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.
*
*/
/* for managing message grouping on Queues */
#include "qpid/broker/StatefulQueueObserver.h"
#include "qpid/broker/MessageDistributor.h"
namespace qpid {
namespace broker {
class QueueObserver;
class MessageDistributor;
class MessageGroupManager : public StatefulQueueObserver, public MessageDistributor
{
const std::string groupIdHeader; // msg header holding group identifier
const unsigned int timestamp; // mark messages with timestamp if set
Messages& messages; // parent Queue's in memory message container
const std::string qName; // name of parent queue (for logs)
struct GroupState {
typedef std::deque<framing::SequenceNumber> PositionFifo;
std::string group; // group identifier
std::string owner; // consumer with outstanding acquired messages
uint32_t acquired; // count of outstanding acquired messages
//uint32_t total; // count of enqueued messages in this group
PositionFifo members; // msgs belonging to this group
GroupState() : acquired(0) {}
bool owned() const {return !owner.empty();}
};
typedef std::map<std::string, struct GroupState> GroupMap;
//typedef std::map<std::string, uint32_t> Consumers; // count of owned groups
typedef std::map<framing::SequenceNumber, struct GroupState *> GroupFifo;
// note: update getState()/setState() when changing this object's state implementation
GroupMap messageGroups; // index: group name
GroupFifo freeGroups; // ordered by oldest free msg
//Consumers consumers; // index: consumer name
static const std::string qpidMessageGroupKey;
static const std::string qpidSharedGroup; // if specified, one group can be consumed by multiple receivers
static const std::string qpidMessageGroupTimestamp;
static const std::string qpidMessageGroupDefault;
const std::string getGroupId( const QueuedMessage& qm ) const;
void unFree( const GroupState& state )
{
GroupFifo::iterator pos = freeGroups.find( state.members.front() );
assert( pos != freeGroups.end() && pos->second == &state );
freeGroups.erase( pos );
}
void own( GroupState& state, const std::string& owner )
{
state.owner = owner;
//consumers[state.owner]++;
unFree( state );
}
void disown( GroupState& state )
{
//assert(consumers[state.owner]);
//consumers[state.owner]--;
state.owner.clear();
assert(state.members.size());
assert(freeGroups.find(state.members.front()) == freeGroups.end());
freeGroups[state.members.front()] = &state;
}
public:
static boost::shared_ptr<MessageGroupManager> create( const std::string& qName,
Messages& messages,
const qpid::framing::FieldTable& settings );
MessageGroupManager(const std::string& header, const std::string& _qName,
Messages& container, unsigned int _timestamp=0 )
: StatefulQueueObserver(std::string("MessageGroupManager:") + header),
groupIdHeader( header ), timestamp(_timestamp), messages(container), qName(_qName) {}
void enqueued( const QueuedMessage& qm );
void acquired( const QueuedMessage& qm );
void requeued( const QueuedMessage& qm );
void dequeued( const QueuedMessage& qm );
void consumerAdded( const Consumer& );
void consumerRemoved( const Consumer& );
void getState(qpid::framing::FieldTable& state ) const;
void setState(const qpid::framing::FieldTable&);
// MessageDistributor iface
bool nextConsumableMessage(Consumer::shared_ptr& c, QueuedMessage& next);
bool allocate(const std::string& c, const QueuedMessage& qm);
bool nextBrowsableMessage(Consumer::shared_ptr& c, QueuedMessage& next);
void query(qpid::types::Variant::Map&) const;
bool match(const qpid::types::Variant::Map*, const QueuedMessage&) const;
};
}}
#endif
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