/* * libjingle * Copyright 2004--2005, Google Inc. * * Redistribution and use in source and binary forms, with or without  * modification, are permitted provided that the following conditions are met: * *  1. Redistributions of source code must retain the above copyright notice,  *     this list of conditions and the following disclaimer. *  2. Redistributions in binary form must reproduce the above copyright notice, *     this list of conditions and the following disclaimer in the documentation *     and/or other materials provided with the distribution. *  3. The name of the author may not be used to endorse or promote products  *     derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */#ifndef CRICKET_BASE_ASYNCFILEH_H__#define CRICKET_BASE_ASYNCFILEH_H__#include "sigslot.h"namespace cricket {// Provides the ability to perform file I/O asynchronously.// TODO: Create a common base class with AsyncSocket.class AsyncFile {public:  virtual ~AsyncFile() {}  // Determines whether the file will receive read events.  virtual bool readable() = 0;  virtual void set_readable(bool value) = 0;  // Determines whether the file will receive write events.  virtual bool writable() = 0;  virtual void set_writable(bool value) = 0;  sigslot::signal1<AsyncFile*> SignalReadEvent;  sigslot::signal1<AsyncFile*> SignalWriteEvent;  sigslot::signal2<AsyncFile*,int> SignalCloseEvent;};} // namespace cricket#endif // CRICKET_BASE_ASYNCFILEH_H__