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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 "Dispatcher.h"
#include <boost/function.hpp>
#include <deque>
namespace qpid {
namespace sys {
/*
* Asynchronous acceptor: accepts connections then does a callback with the
* accepted fd
*/
class AsynchAcceptor {
public:
typedef boost::function1<void, const Socket&> Callback;
private:
Callback acceptedCallback;
DispatchHandle handle;
const Socket& socket;
public:
AsynchAcceptor(const Socket& s, Callback callback);
void start(Poller::shared_ptr poller);
private:
void readable(DispatchHandle& handle);
};
/*
* Asycnchronous 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)
*
* The class is implemented in terms of DispatchHandle to allow it to be deleted by deleting
* the contained DispatchHandle
*/
class AsynchIO : private DispatchHandle {
public:
struct BufferBase {
char* const bytes;
const int32_t byteCount;
int32_t dataStart;
int32_t dataCount;
BufferBase(char* const b, const int32_t s) :
bytes(b),
byteCount(s),
dataStart(0),
dataCount(0)
{}
virtual ~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;
private:
ReadCallback readCallback;
EofCallback eofCallback;
DisconnectCallback disCallback;
ClosedCallback closedCallback;
BuffersEmptyCallback emptyCallback;
IdleCallback idleCallback;
const Socket& socket;
std::deque<BufferBase*> bufferQueue;
std::deque<BufferBase*> writeQueue;
bool queuedClose;
/**
* This flag is used to detect and handle concurrency between
* calls to notifyPendingWrite() (which can be made from any thread) and
* the execution of the writeable() method (which is always on the
* thread processing this handle.
*/
volatile bool writePending;
public:
AsynchIO(const Socket& s,
ReadCallback rCb, EofCallback eofCb, DisconnectCallback disCb,
ClosedCallback cCb = 0, BuffersEmptyCallback eCb = 0, IdleCallback iCb = 0);
void queueForDeletion();
void start(Poller::shared_ptr poller);
void queueReadBuffer(BufferBase* buff);
void unread(BufferBase* buff);
void queueWrite(BufferBase* buff);
void notifyPendingWrite();
void queueWriteClose();
bool writeQueueEmpty() { return writeQueue.empty(); }
BufferBase* getQueuedBuffer();
private:
~AsynchIO();
void readable(DispatchHandle& handle);
void writeable(DispatchHandle& handle);
void disconnected(DispatchHandle& handle);
void close(DispatchHandle& handle);
};
}}
#endif // _sys_AsynchIO
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