source: xplcommon/src/xplcommon/win32/LocalAcceptor.h@ 22:d13fbc745959

// Copyright (c) 2012 by István Váradi

// This file is part of libxplcommon, a common utility library for
// development related to X-Plane

// 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.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.

// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.

#ifndef XPLCOMMON_WIN32_LOCALACCEPTOR_H
#define XPLCOMMON_WIN32_LOCALACCEPTOR_H
//------------------------------------------------------------------------------

#include "Completer.h"

#include "LocalServerSocketBase.h"
#include "LocalSocket.h"

//------------------------------------------------------------------------------

namespace xplcommon { namespace win32 {

//------------------------------------------------------------------------------

/**
 * Instances of this class are used to accept connection requests to a
 * local server socket, i.e. named pipe.
 */
class LocalAcceptor : public Completer,
                      public FailableReference<LocalAcceptor>
{
private:
    /**
     * The local server socket for which we are accepting connections.
     */
    LocalServerSocketBase& socket;

    /**
     * The path of the pipe to accept.
     */
    char path[256];

    /**
     * Indicate if the connection has been accepted.
     */
    bool accepted;

protected:
    /**
     * Construct the acceptor.
     */
    LocalAcceptor(LocalServerSocketBase* socket, const char* name);

public:
    /**
     * Try to accept a connection.
     *
     * If one is already accepted, but not retrieved yet, return true.
     *
     * If a new connection becomes immediately available, return true.
     *
     * If a new connection is not yet available, returns false.
     *
     * If some error occurs, the acceptor is marked failed and false
     * is returned.
     */
    bool accept();

    /**
     * Get the local socket accepted last. If no socket was accepted,
     * return 0. The local socket's waiter will be the given one.
     */
    LocalSocket* getSocket(Waiter* waiter,
                           size_t readingCapacity = LocalSocket::DEFAULT_CAPACITY,
                           size_t writingCapacity = LocalSocket::DEFAULT_CAPACITY);
    /**
     * Get the local socket accepted last. If no socket was accepted,
     * return 0. The local socket's waiter will be the same as that of
     * the associated server socket.
     */
    LocalSocket* getSocket(size_t readingCapacity = LocalSocket::DEFAULT_CAPACITY,
                           size_t writingCapacity = LocalSocket::DEFAULT_CAPACITY);


protected:
    /**
     * Set the indicator of an accepted connection to true.
     *
     * @see Completer::handleWaitedResult
     */
    virtual void handleWaitedResult(DWORD size);

private:
    /**
     * Get the failable object.
     */
    const ::xplcommon::Failable& getFailable() const;

    /**
     * Get the failable object.
     */
    ::xplcommon::Failable& getFailable();

    friend class FailableReference<LocalAcceptor>;
    friend class LocalServerSocket;
};

//------------------------------------------------------------------------------
// Inline definitions
//------------------------------------------------------------------------------

inline LocalSocket* LocalAcceptor::getSocket(Waiter* waiter,
                                             size_t readingCapacity,
                                             size_t writingCapacity)
{
    if (!accepted) return 0;

    LocalSocket* s = new LocalSocket(waiter, socket.releaseHandle(),
                                     readingCapacity, writingCapacity);
    accepted = false;
    return s;
}
//------------------------------------------------------------------------------

inline LocalSocket* LocalAcceptor::getSocket(size_t readingCapacity,
                                             size_t writingCapacity)
{
    return getSocket(socket.waiter, readingCapacity, writingCapacity);
}

//------------------------------------------------------------------------------

inline const ::xplcommon::Failable& LocalAcceptor::getFailable() const
{
    return socket;
}

//------------------------------------------------------------------------------

inline ::xplcommon::Failable& LocalAcceptor::getFailable()
{
    return socket;
}

//------------------------------------------------------------------------------

} /* namespace xplcommon::win32 */ } /* namespace xplcommon */

//------------------------------------------------------------------------------
#endif // XPLCOMMON_WIN32_LOCALACCEPTOR_H

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