distributer.h

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/* -*- C++ -*- */
// distributer.h,v 1.6 2002/01/29 20:20:53 okellogg Exp

// ============================================================================
//
// = LIBRARY
//    TAO/orbsvcs/tests/AVStreams/Component_Switching
//
// = FILENAME
//    distributer.h
//
// = DESCRIPTION
//    Process to receive data from the sender and send it to the
//    receiver.
//
// = AUTHOR
//    Yamuna Krishnamurthy <[e-mail]>
//
// ============================================================================

#include "Connection_Manager.h"
#include "orbsvcs/AV/AVStreams_i.h"
#include "orbsvcs/AV/Endpoint_Strategy.h"
#include "orbsvcs/AV/Policy.h"

class Signal_Handler : public ACE_Event_Handler
{
  // TITLE
  //   This class Handles the SIGINT signal through the Reactor.
  //   Useful to gracefully release the process

public:

  Signal_Handler (void);

  int handle_signal(int signum, siginfo_t*,ucontext_t*);
  // Override this method to implement graceful shutdown.

};


class Distributer_Receiver_Callback : public TAO_AV_Callback
{
  // = TITLE
  //    Application defined callback object.
  //
  // = DESCRIPTION
  //    AVStreams calls this class when data shows up from a sender.
public:

  Distributer_Receiver_Callback (void);
  /// Constructor.

  /// Method that is called when there is data to be received from a
  /// sender.
  int receive_frame (ACE_Message_Block *frame,
                     TAO_AV_frame_info *frame_info,
                     const ACE_Addr &peer_address);

  /// Called when the sender is done sending data and wants to close
  /// down the connection.
  int handle_destroy (void);

  /// Accessor methods for the flowname of the callback.
  ACE_CString &flowname (void);
  void flowname (const ACE_CString &flowname);

private:
  int frame_count_;
  /// Count of the frames passing through us.

  ACE_CString flowname_;
  /// Flowname of the flow.
};

class Distributer_Sender_Callback : public TAO_AV_Callback
{
  /// = TITLE
  //    Defines a class for the distributer application callback
  //    for receiving data.
  //
  // = DESCRIPTION
  //    This class overides the methods of the TAO_AV_Callback so the
  //    AVStreams can make upcalls to the application.

public:

  int handle_destroy (void);
  /// Called when the sender has finished reading the file and wants
  /// to close down the connection.

  /// Accessor methods for the flowname of the callback.
  ACE_CString &flowname (void);
  void flowname (const ACE_CString &flowname);

private:

  ACE_CString flowname_;

};

class Distributer_Receiver_StreamEndPoint : public TAO_Server_StreamEndPoint
{
  // = TITLE
  //    Application defined stream endpoint object.
  //
  // = DESCRIPTION
  //    AVStreams calls this class during connection setup.
public:
  /// Create a receiver application callback.
  int get_callback (const char *flowname,
                    TAO_AV_Callback *&callback);

  int set_protocol_object (const char *,
                           TAO_AV_Protocol_Object *object);
  /// Store the reference to the protocol object corresponding
  /// to the transport

  virtual CORBA::Boolean handle_connection_requested (AVStreams::flowSpec &the_spec
                                                      ACE_ENV_ARG_DECL_NOT_USED);
  /// Called when a sender makes a connection request.

private:
  Distributer_Receiver_Callback callback_;
  /// Receiver application callback.
};

class Distributer_Sender_StreamEndPoint : public TAO_Client_StreamEndPoint
{
  /// = TITLE
  ///    Defines a sender stream endpoint.
public:
  int get_callback (const char *flowname,
                    TAO_AV_Callback *&callback);
  /// Create the application callback and return its handle to
  /// AVStreams for further application callbacks.

  int set_protocol_object (const char *flowname,
                           TAO_AV_Protocol_Object *object);
  /// Set protocol object corresponding to the transport protocol
  /// chosen.

protected:
  Distributer_Sender_Callback callback_;
  /// Application callback.
};

typedef TAO_AV_Endpoint_Reactive_Strategy_A
          <Distributer_Sender_StreamEndPoint,
           TAO_VDev,
           AV_Null_MediaCtrl>
        SENDER_ENDPOINT_STRATEGY;

typedef TAO_AV_Endpoint_Reactive_Strategy_B
          <Distributer_Receiver_StreamEndPoint,
           TAO_VDev,
           AV_Null_MediaCtrl>
        RECEIVER_ENDPOINT_STRATEGY;

class Distributer
{
  // = TITLE
  //    Distributer Application.
  //
  // = DESCRIPTION
  //    The distributer is the intermediate receiver that receives
  //    data from the sender and forwards to a receiver.
public:
  Distributer (void);
  /// Constructor

  ~Distributer (void);
  /// Destructor.

  int init (int argc,
            char **argv
            ACE_ENV_ARG_DECL_NOT_USED);
  /// Initialize data components.

  int parse_args (int argc,
                  char **argv);
  /// Parse args.

  /// Flag to know when we are done.
  int done (void) const;
  void done (int);

  Connection_Manager &connection_manager (void);
  /// Accessor to connection manager.

  void stream_created (void);
  /// Called when stream created

  void stream_destroyed (void);
  /// Called when stream destroyed

  void shut_down (ACE_ENV_SINGLE_ARG_DECL_NOT_USED);
  ///Unbind the sender and receiver from the Naming Service

protected:
  Connection_Manager connection_manager_;
  /// Connection manager.

  SENDER_ENDPOINT_STRATEGY sender_endpoint_strategy_;
  /// The sender endpoint strategy.

  RECEIVER_ENDPOINT_STRATEGY receiver_endpoint_strategy_;
  /// The receiver endpoint strategy.

  TAO_MMDevice* distributer_receiver_mmdevice_;
  /// The distributer receiver multimedia device

  TAO_MMDevice* distributer_sender_mmdevice_;
  /// The distributer receiver multimedia device

  ACE_CString sender_name_;
  /// The name of the sender to connect to.

  ACE_CString distributer_name_;
  /// Our name.

  int done_;
  /// Flag to know when we are done.

  int stream_count_;
  /// Number of active streams. When a stream is disconnected this
  /// count is decremented.

  Signal_Handler signal_handler_;
  /// Reference to the signal handler.

};