NAME

       ost::SocketPort - The socket port is an internal class which is attached to and then
       serviced by a specific SocketService 'object'.

SYNOPSIS

       #include <socketport.h>

       Inherits ost::Socket, and ost::TimerPort.

   Public Member Functions
       void setTimer (timeout_t timeout=0)
           Derived setTimer to notify the service thread pool of change in expected timeout.
       void incTimer (timeout_t timeout)
           Derived incTimer to notify the service thread pool of a change in expected timeout.

   Protected Member Functions
       SocketPort (SocketService *svc, TCPSocket &tcp)
           Construct an accepted TCP socket connection from a specific bound TCP server.
       SocketPort (SocketService *svc, TCPV6Socket &tcp)
       SocketPort (SocketService *svc, const IPV4Address &ia, tpport_t port)
           Construct a bound UDP socket for use in deriving realtime UDP streaming protocols
           handled by thread pool objects.
       SocketPort (SocketService *svc, const IPV6Address &ia, tpport_t port)
       SocketPort (SocketService *svc, const IPV4Host &ih, tpport_t port)
           A non-blocking constructor for outbound tcp connections.
       SocketPort (SocketService *svc, const IPV6Host &ih, tpport_t port)
       void attach (SocketService *svc)
           Attach yourself to the service pool thread object.
       virtual ~SocketPort ()
           Disconnect the socket from the service thread pool and the remote connection.
       void setDetectPending (bool)
           Used to indicate if the service thread should monitor pending data for us.
       bool getDetectPending (void) const
           Get the current state of the DetectPending flag.
       void setDetectOutput (bool)
           Used to indicate if output ready monitoring should be performed by the service thread.
       bool getDetectOutput (void) const
           Get the current state of the DetectOutput flag.
       virtual void expired (void)
           Called by the service thread pool when the objects timer has expired.
       virtual void pending (void)
           Called by the service thread pool when input data is pending for this socket.
       virtual void output (void)
           Called by the service thread pool when output data is pending for this socket.
       virtual void disconnect (void)
           Called by the service thread pool when a disconnect has occured.
       Error connect (const IPV4Address &ia, tpport_t port)
           Connect a Socket Port to a known peer host.
       Error connect (const IPV6Address &ia, tpport_t port)
       ssize_t send (const void *buf, size_t len)
           Transmit 'send' data to a connected peer host.
       ssize_t receive (void *buf, size_t len)
           Receive a message from any host.
       ssize_t peek (void *buf, size_t len)
           Examine the content of the next packet.

   Friends
       class SocketService

   Additional Inherited Members

Detailed Description

       The socket port is an internal class which is attached to and then serviced by a specific
       SocketService 'object'.

       Derived versions of this class offer specific functionality for specific protocols. Both
       Common C++ supporting frameworks and application objects may be derived from related
       protocol specific base classes.

       A special set of classes, 'SocketPort' and 'SocketService', exist for building realtime
       streaming media servers on top of UDP and TCP protocols. The 'SocketPort' is used to hold
       a connected or associated TCP or UDP socket which is being 'streamed' and which offers
       callback methods that are invoked from a 'SocketService' thread. SocketService's can be
       pooled into logical thread pools that can service a group of SocketPorts. A millisecond
       accurate 'timer' is associated with each SocketPort and can be used to time synchronize
       SocketPort I/O operations.

       Author:
           David Sugar dyfet@ostel.com base class for realtime and thread pool serviced
           protocols.

       Examples:
           tcpservice.cpp.

Constructor & Destructor Documentation

   ost::SocketPort::SocketPort (SocketService * svc, TCPSocket & tcp) [protected]
       Construct an accepted TCP socket connection from a specific bound TCP server. This is
       meant to derive advanced application specific TCP servers that can be thread pooled.

       Parameters:
           svc pool thread object.
           tcp socket object to accept.

   ost::SocketPort::SocketPort (SocketService * svc, TCPV6Socket & tcp) [protected]
   ost::SocketPort::SocketPort (SocketService * svc, const IPV4Address & ia, tpport_t port)
       [protected]
       Construct a bound UDP socket for use in deriving realtime UDP streaming protocols handled
       by thread pool objects.

       Parameters:
           svc pool thread object.
           ia address of interface to bind.
           port number to bind to.

   ost::SocketPort::SocketPort (SocketService * svc, const IPV6Address & ia, tpport_t port)
       [protected]
   ost::SocketPort::SocketPort (SocketService * svc, const IPV4Host & ih, tpport_t port)
       [protected]
       A non-blocking constructor for outbound tcp connections. To detect when the connection is
       established, overload SocketPort::output(). SocketPort::output() get's called by the
       SocketService when the connection is ready, SocketPort::disconnect() when the connect
       failed. at the moment you should set the socket state to 'CONNECTED' when
       SocketPort::output() get's called for the first time.

       Parameters:
           svc pool thread object.
           ih addess to connect to.
           port number to connect to.

   ost::SocketPort::SocketPort (SocketService * svc, const IPV6Host & ih, tpport_t port)
       [protected]
   virtual ost::SocketPort::~SocketPort () [protected],  [virtual]
       Disconnect the socket from the service thread pool and the remote connection.

Member Function Documentation

   void ost::SocketPort::attach (SocketService * svc) [protected]
       Attach yourself to the service pool thread object. The later version.

       Parameters:
           svc pool thread object

   Error ost::SocketPort::connect (const IPV4Address & ia, tpport_t port) [protected]
       Connect a Socket Port to a known peer host. This is normally used with the UDP
       constructor. This is also performed as a non-blocking operation under Posix systems to
       prevent delays in a callback handler.

       Returns:
           0 if successful.

       Parameters:
           ia address of remote host or subnet.
           port number of remote peer(s).

   Error ost::SocketPort::connect (const IPV6Address & ia, tpport_t port) [protected]
   virtual void ost::SocketPort::disconnect (void) [protected],  [virtual]
       Called by the service thread pool when a disconnect has occured.

   virtual void ost::SocketPort::expired (void) [protected],  [virtual]
       Called by the service thread pool when the objects timer has expired. Used for timed
       events.

   bool ost::SocketPort::getDetectOutput (void) const [inline],  [protected]
       Get the current state of the DetectOutput flag.

   bool ost::SocketPort::getDetectPending (void) const [inline],  [protected]
       Get the current state of the DetectPending flag.

   void ost::SocketPort::incTimer (timeout_t timeout)
       Derived incTimer to notify the service thread pool of a change in expected timeout. This
       allows SocketService to reschedule all timers. Otherwise same as TimerPort.

       Parameters:
           timeout in milliseconds.

   virtual void ost::SocketPort::output (void) [protected],  [virtual]
       Called by the service thread pool when output data is pending for this socket.

   ssize_t ost::SocketPort::peek (void * buf, size_t len) [inline],  [protected]
       Examine the content of the next packet. This can be used to build 'smart' line buffering
       for derived TCP classes.

       Parameters:
           buf pointer to packet buffer to examine.
           len of packet buffer to examine.

       Returns:
           number of bytes actually available.

       References _IOLEN64.

   virtual void ost::SocketPort::pending (void) [protected],  [virtual]
       Called by the service thread pool when input data is pending for this socket.

   ssize_t ost::SocketPort::receive (void * buf, size_t len) [inline],  [protected]
       Receive a message from any host. This is used in derived classes to build protocols.

       Parameters:
           buf pointer to packet buffer to receive.
           len of packet buffer to receive.

       Returns:
           number of bytes received.

       References _IOLEN64.

   ssize_t ost::SocketPort::send (const void * buf, size_t len) [inline],  [protected]
       Transmit 'send' data to a connected peer host. This is not public by default since an
       overriding protocol is likely to be used in a derived class.

       Returns:
           number of bytes sent.

       Parameters:
           buf address of buffer to send.
           len of bytes to send.

       References _IOLEN64.

   void ost::SocketPort::setDetectOutput (bool) [protected]
       Used to indicate if output ready monitoring should be performed by the service thread.

   void ost::SocketPort::setDetectPending (bool) [protected]
       Used to indicate if the service thread should monitor pending data for us.

   void ost::SocketPort::setTimer (timeout_t timeout = 0)
       Derived setTimer to notify the service thread pool of change in expected timeout. This
       allows SocketService to reschedule all timers. Otherwise same as TimerPort.

       Parameters:
           timeout in milliseconds.

Friends And Related Function Documentation

   friend class SocketService [friend]

Author

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