socketpool.h

本人收集整理的一份c/c++跨平台网络库

#ifndef UTILS_BASE_SOCKETPOOL_H_
#define UTILS_BASE_SOCKETPOOL_H_

#include <deque>
#include <vector>
#include "logging.h"
#include "sigslot.h"

namespace utils_base {

class AsyncSocket;
class LoggingAdapter;
class SocketAddress;
class SocketFactory;
class SocketStream;
class StreamInterface;

//////////////////////////////////////////////////////////////////////
// StreamPool
//////////////////////////////////////////////////////////////////////

class StreamPool {
public:
  virtual ~StreamPool() { }

  virtual StreamInterface* RequestConnectedStream(const SocketAddress& remote,
                                                  int* err) = 0;
  virtual void ReturnConnectedStream(StreamInterface* stream) = 0;
};

///////////////////////////////////////////////////////////////////////////////
// StreamCache - Caches a set of open streams, defers creation/destruction to
//  the supplied StreamPool.
///////////////////////////////////////////////////////////////////////////////

class StreamCache : public StreamPool, public sigslot::has_slots<> {
public:
  StreamCache(StreamPool* pool);
  virtual ~StreamCache();

  // StreamPool Interface
  virtual StreamInterface* RequestConnectedStream(const SocketAddress& remote,
                                                  int* err);
  virtual void ReturnConnectedStream(StreamInterface* stream);

private:
  typedef std::pair<SocketAddress, StreamInterface*> ConnectedStream;
  typedef std::list<ConnectedStream> ConnectedList;

  void OnStreamEvent(StreamInterface* stream, int events, int err);

  // We delegate stream creation and deletion to this pool.
  StreamPool* pool_;
  // Streams that are in use (returned from RequestConnectedStream).
  ConnectedList active_;
  // Streams which were returned to us, but are still open.
  ConnectedList cached_;
};

//////////////////////////////////////////////////////////////////////
// NewSocketPool //
///////////////////
// Creates a new PTcpSocket every time
//////////////////////////////////////////////////////////////////////

class NewSocketPool : public StreamPool {
public:
  NewSocketPool(SocketFactory* factory);
  virtual ~NewSocketPool();
  
  // StreamPool Interface
  virtual StreamInterface* RequestConnectedStream(const SocketAddress& remote,
                                                  int* err);
  virtual void ReturnConnectedStream(StreamInterface* stream);
  
private:
  SocketFactory* factory_;
  std::vector<StreamInterface*> used_;
};

//////////////////////////////////////////////////////////////////////
// ReuseSocketPool //
/////////////////////
// Pass a PTcpSocket chain to the constructor, and if the connection
// is still open, it will be reused.
//////////////////////////////////////////////////////////////////////

class ReuseSocketPool : public StreamPool {
public:
  ReuseSocketPool(SocketFactory* factory, AsyncSocket* socket = 0);
  virtual ~ReuseSocketPool();

  void setSocket(AsyncSocket* socket);

  // StreamPool Interface
  virtual StreamInterface* RequestConnectedStream(const SocketAddress& remote,
                                                  int* err);
  virtual void ReturnConnectedStream(StreamInterface* stream);
  
private:
  SocketFactory* factory_;
  SocketStream* stream_;
};

///////////////////////////////////////////////////////////////////////////////
// LoggingPoolAdapter - Adapts a StreamPool to supply streams with attached
// LoggingAdapters.
///////////////////////////////////////////////////////////////////////////////

class LoggingPoolAdapter : public StreamPool {
public:
  LoggingPoolAdapter(StreamPool* pool, LoggingSeverity level,
                     const std::string& label, bool binary_mode);
  virtual ~LoggingPoolAdapter();

  // StreamPool Interface
  virtual StreamInterface* RequestConnectedStream(const SocketAddress& remote,
                                                  int* err);
  virtual void ReturnConnectedStream(StreamInterface* stream);

private:
  StreamPool* pool_;
  LoggingSeverity level_;
  std::string label_;
  bool binary_mode_;
  typedef std::deque<LoggingAdapter*> StreamList;
  StreamList recycle_bin_;
};

//////////////////////////////////////////////////////////////////////

} // namespace utils_base

#endif // UTILS_BASE_SOCKETPOOL_H_