/* -*- C++ -*- */
// $Id$

// ============================================================================
//
// = LIBRARY
//    ace
// 
// = FILENAME
//    XtReactor.h
//
// = AUTHOR
//    Eric C. Newton's <ecn@clark.net> and Douglas C. Schmidt <schmidt@cs.wustl.edu>
// 
// ============================================================================

#if !defined (ACE_XTREACTOR_H)
#define ACE_XTREACTOR_H

#include "ace/Select_Reactor.h"

#if defined (ACE_HAS_XT)

#define String XtString
#include /**/ <X11/Intrinsic.h>
#undef String

// Forward decl.
struct ACE_XtReactorID;

class ACE_XtReactor : public ACE_Select_Reactor
  // = TITLE
  //     An object oriented event demultiplexor and event handler
  //     dispatcher that uses the X Toolkit functions.
{
public:
  // = Initialization and termination methods.
  ACE_XtReactor (XtAppContext context,
		 size_t size = DEFAULT_SIZE, 
		 int restart = 0, 
		 ACE_Sig_Handler * = 0);
  virtual ~ACE_XtReactor (void);

  XtAppContext context (void);

  // = Timer operations.
  virtual long schedule_timer (ACE_Event_Handler *handler, 
			       const void *arg,
			       const ACE_Time_Value &delta_time, 
			       const ACE_Time_Value &interval);

  virtual int cancel_timer (ACE_Event_Handler *handler,
			    int dont_call_handle_close = 1);

  virtual int cancel_timer (long timer_id, 
			    const void **arg = 0,
			    int dont_call_handle_close = 1);

protected:
  // = Register timers/handles with Xt.
  virtual int register_handler_i (ACE_HANDLE handle, 
				  ACE_Event_Handler *handler,
				  ACE_Reactor_Mask mask);
  // Register a single <handler>.

  virtual int register_handler_i (const ACE_Handle_Set &handles, 
				  ACE_Event_Handler *handler, 
				  ACE_Reactor_Mask mask);
  // Register a set of <handlers>.

  virtual int remove_handler_i (ACE_HANDLE handle, 
				ACE_Reactor_Mask mask);
  // Remove the <handler> associated with this <handle>.

  virtual int remove_handler_i (const ACE_Handle_Set &handles, 
                                ACE_Reactor_Mask);
  // Remove a set of <handles>.

  virtual int wait_for_multiple_events (ACE_Select_Reactor_Handle_Set &,
					ACE_Time_Value *); 
  // Wait for events to occur.

  virtual int XtWaitForMultipleEvents (int, 
				       ACE_Select_Reactor_Handle_Set &,
				       ACE_Time_Value *); 

  XtAppContext context_;
  struct ACE_XtReactorID *ids_;
  int id_len_;
  XtIntervalId timeout_;

private:
  void reset_timeout (void);

  // = Integrate with the X callback function mechanism.
  static void TimerCallbackProc (XtPointer closure, XtIntervalId *id);
  static void InputCallbackProc (XtPointer closure, int* source, XtInputId *id);

  ACE_XtReactor (const ACE_XtReactor &);
  ACE_XtReactor &operator = (const ACE_XtReactor &);
  // Deny access since member-wise won't work...
};
#endif /* ACE_HAS_XT */

#endif /* ACE_XTREACTOR_H */