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#ifndef _sys_AsynchIO
#define _sys_AsynchIO
/*
*
* 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/sys/IntegerTypes.h"
#include "qpid/CommonImportExport.h"
#include <string.h>
#include <boost/function.hpp>
#include <boost/shared_ptr.hpp>
namespace qpid {
namespace sys {
class Socket;
class Poller;
/*
* Asynchronous acceptor: accepts connections then does a callback with the
* accepted fd
*/
class AsynchAcceptor {
public:
typedef boost::function1<void, const Socket&> Callback;
QPID_COMMON_EXTERN static AsynchAcceptor* create(const Socket& s, Callback callback);
virtual ~AsynchAcceptor() {};
virtual void start(boost::shared_ptr<Poller> poller) = 0;
};
/*
* Asynchronous connector: starts the process of initiating a connection and
* invokes a callback when completed or failed.
*/
class AsynchConnector {
public:
typedef boost::function1<void, const Socket&> ConnectedCallback;
typedef boost::function3<void, const Socket&, int, const std::string&> FailedCallback;
// Call create() to allocate a new AsynchConnector object with the
// specified poller, addressing, and callbacks.
// This method is implemented in platform-specific code to
// create a correctly typed object. The platform code also manages
// deletes. To correctly manage heaps when needed, the allocate and
// delete should both be done from the same class/library.
QPID_COMMON_EXTERN static AsynchConnector* create(const Socket& s,
const std::string& hostname,
const std::string& port,
ConnectedCallback connCb,
FailedCallback failCb);
virtual void start(boost::shared_ptr<Poller> poller) = 0;
virtual void stop() {};
protected:
AsynchConnector() {}
virtual ~AsynchConnector() {}
};
struct AsynchIOBufferBase {
char* const bytes;
const int32_t byteCount;
int32_t dataStart;
int32_t dataCount;
AsynchIOBufferBase(char* const b, const int32_t s) :
bytes(b),
byteCount(s),
dataStart(0),
dataCount(0)
{}
virtual ~AsynchIOBufferBase()
{}
void squish() {
if (dataStart != 0) {
::memmove(bytes, bytes + dataStart, dataCount);
dataStart = 0;
}
}
};
/*
* Asychronous reader/writer:
* Reader accepts buffers to read into; reads into the provided buffers
* and then does a callback with the buffer and amount read. Optionally it
* can callback when there is something to read but no buffer to read it into.
*
* Writer accepts a buffer and queues it for writing; can also be given
* a callback for when writing is "idle" (ie fd is writable, but nothing
* to write).
*/
class AsynchIO {
public:
typedef AsynchIOBufferBase BufferBase;
typedef boost::function2<void, AsynchIO&, BufferBase*> ReadCallback;
typedef boost::function1<void, AsynchIO&> EofCallback;
typedef boost::function1<void, AsynchIO&> DisconnectCallback;
typedef boost::function2<void, AsynchIO&, const Socket&> ClosedCallback;
typedef boost::function1<void, AsynchIO&> BuffersEmptyCallback;
typedef boost::function1<void, AsynchIO&> IdleCallback;
typedef boost::function1<void, AsynchIO&> RequestCallback;
// Call create() to allocate a new AsynchIO object with the specified
// callbacks. This method is implemented in platform-specific code to
// create a correctly typed object. The platform code also manages
// deletes. To correctly manage heaps when needed, the allocate and
// delete should both be done from the same class/library.
QPID_COMMON_EXTERN static AsynchIO* create(const Socket& s,
ReadCallback rCb,
EofCallback eofCb,
DisconnectCallback disCb,
ClosedCallback cCb = 0,
BuffersEmptyCallback eCb = 0,
IdleCallback iCb = 0);
public:
virtual void queueForDeletion() = 0;
virtual void start(boost::shared_ptr<Poller> poller) = 0;
virtual void queueReadBuffer(BufferBase* buff) = 0;
virtual void unread(BufferBase* buff) = 0;
virtual void queueWrite(BufferBase* buff) = 0;
virtual void notifyPendingWrite() = 0;
virtual void queueWriteClose() = 0;
virtual bool writeQueueEmpty() = 0;
virtual void startReading() = 0;
virtual void stopReading() = 0;
virtual void requestCallback(RequestCallback) = 0;
virtual BufferBase* getQueuedBuffer() = 0;
protected:
// Derived class manages lifetime; must be constructed using the
// static create() method. Deletes not allowed from outside.
AsynchIO() {}
virtual ~AsynchIO() {}
};
}}
#endif // _sys_AsynchIO
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