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#ifndef _ChannelAdapter_
#define _ChannelAdapter_
/*
*
* 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/shared_ptr.h"
#include "BodyHandler.h"
#include "Requester.h"
#include "Responder.h"
#include "Correlator.h"
#include "amqp_types.h"
#include "FrameHandler.h"
namespace qpid {
namespace framing {
class MethodContext;
/**
* Base class for client and broker channels.
*
* Provides in/out handler chains containing channel handlers.
* Chains may be modified by ChannelUpdaters registered with the broker.
*
* The handlers provided by the ChannelAdapter update request/response data.
*
* send() constructs a frame, updates request/resposne ID and forwards it
* to the out() chain.
*
* Thread safety: OBJECT UNSAFE. Instances must not be called
* concurrently. AMQP defines channels to be serialized.
*/
class ChannelAdapter : protected BodyHandler {
public:
/**
*@param output Processed frames are forwarded to this handler.
*/
ChannelAdapter() : id(0) {}
virtual ~ChannelAdapter() {}
/** Initialize the channel adapter. */
void init(ChannelId, OutputHandler&, ProtocolVersion);
FrameHandler::Chains& getHandlers() { return handlers; }
ChannelId getId() const { return id; }
ProtocolVersion getVersion() const { return version; }
/**
* Send a frame.
*@param body Body of the frame.
*@param action optional action to execute when we receive a
*response to this frame. Ignored if body is not a Request.
*@return If body is a request, the ID assigned else 0.
*/
virtual RequestId send(shared_ptr<AMQBody> body,
Correlator::Action action=Correlator::Action());
virtual bool isOpen() const = 0;
RequestId getFirstAckRequest() { return requester.getFirstAckRequest(); }
RequestId getLastAckRequest() { return requester.getLastAckRequest(); }
RequestId getNextSendRequestId() { return requester.getNextId(); }
protected:
void assertMethodOk(AMQMethodBody& method) const;
void assertChannelOpen() const;
void assertChannelNotOpen() const;
virtual void handleMethodInContext(
shared_ptr<AMQMethodBody> method,
const MethodContext& context) = 0;
private:
class ChannelAdapterHandler;
friend class ChannelAdapterHandler;
void handleMethod(shared_ptr<AMQMethodBody>);
void handleRequest(shared_ptr<AMQRequestBody>);
void handleResponse(shared_ptr<AMQResponseBody>);
ChannelId id;
ProtocolVersion version;
Requester requester;
Responder responder;
Correlator correlator;
FrameHandler::Chains handlers;
};
}}
#endif
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