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#ifndef _broker_Reference_h
#define _broker_Reference_h
/*
*
* 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.
*
*/
#include <string>
#include <vector>
#include <map>
#include <boost/shared_ptr.hpp>
#include <boost/range.hpp>
namespace qpid {
namespace framing {
class MessageAppendBody;
}
namespace broker {
class MessageMessage;
class ReferenceRegistry;
/**
* A reference is an accumulation point for data in a multi-frame
* message. A reference can be used by multiple transfer commands to
* create multiple messages, so the reference tracks which commands
* are using it. When the reference is closed, all the associated
* transfers are completed.
*
* THREAD UNSAFE: per-channel resource, access to channels is
* serialized.
*/
class Reference
{
public:
typedef std::string Id;
typedef boost::shared_ptr<Reference> shared_ptr;
typedef boost::shared_ptr<MessageMessage> MessagePtr;
typedef std::vector<MessagePtr> Messages;
typedef boost::shared_ptr<framing::MessageAppendBody> AppendPtr;
typedef std::vector<AppendPtr> Appends;
Reference(const Id& id_=Id(), ReferenceRegistry* reg=0)
: id(id_), size(0), registry(reg) {}
const std::string& getId() const { return id; }
uint64_t getSize() const { return size; }
/** Add a message to be completed with this reference */
void addMessage(MessagePtr message) { messages.push_back(message); }
/** Append more data to the reference */
void append(AppendPtr ptr);
/** Close the reference, complete each associated message */
void close();
const Appends& getAppends() const { return appends; }
const Messages& getMessages() const { return messages; }
private:
Id id;
uint64_t size;
ReferenceRegistry* registry;
Messages messages;
Appends appends;
};
/**
* A registry/factory for references.
*
* THREAD UNSAFE: per-channel resource, access to channels is
* serialized.
*/
class ReferenceRegistry {
public:
ReferenceRegistry() {};
Reference::shared_ptr open(const Reference::Id& id);
Reference::shared_ptr get(const Reference::Id& id);
private:
typedef std::map<Reference::Id, Reference::shared_ptr> ReferenceMap;
ReferenceMap references;
// Reference calls references.erase().
friend class Reference;
};
}} // namespace qpid::broker
#endif /*!_broker_Reference_h*/
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