include/wx/private/selectdispatcher.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/private/selectdispatcher.h
   3 // Purpose:     wxSelectDispatcher class
   4 // Authors:     Lukasz Michalski
   5 // Modified by:
   6 // Created:     December 2006
   7 // Copyright:   (c) Lukasz Michalski
   8 // RCS-ID:      $Id$
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_PRIVATE_SELECTDISPATCHER_H_
  13 #define _WX_PRIVATE_SELECTDISPATCHER_H_
  14
  15 #include "wx/defs.h"
  16
  17 #include "wx/hashmap.h"
  18
  19 static const int wxSELECT_TIMEOUT_INFINITE = -1;
  20
  21 // handler used to process events on descriptors
  22 class wxFDIOHandler
  23 {
  24 public:
  25     // called when descriptor is available for non-blocking read
  26     virtual void OnReadWaiting(int fd) = 0;
  27
  28     // called when descriptor is available  for non-blocking write
  29     virtual void OnWriteWaiting(int fd) = 0;
  30
  31     // called when there is exception on descriptor
  32     virtual void OnExceptionWaiting(int fd) = 0;
  33
  34     // virtual dtor for the base class
  35     virtual ~wxFDIOHandler() { }
  36 };
  37
  38 // those flags describes sets where descriptor should be added
  39 enum wxSelectDispatcherEntryFlags
  40 {
  41     wxSelectInput = 1,
  42     wxSelectOutput = 2,
  43     wxSelectException = 4,
  44     wxSelectAll = wxSelectInput | wxSelectOutput | wxSelectException
  45 };
  46
  47 WX_DECLARE_HASH_MAP(
  48   int,
  49   wxFDIOHandler*,
  50   wxIntegerHash,
  51   wxIntegerEqual,
  52   wxFDIOHandlerMap
  53 );
  54
  55 class WXDLLIMPEXP_CORE wxSelectDispatcher
  56 {
  57 public:
  58     // returns instance of the table
  59     static wxSelectDispatcher& Get();
  60
  61     virtual ~wxSelectDispatcher()
  62     {
  63     }
  64
  65     // register descriptor in sets.
  66     void RegisterFD(int fd, wxFDIOHandler* handler, int flags = wxSelectAll);
  67
  68     // unregister descriptor from sets and return handler for cleanup
  69     wxFDIOHandler* UnregisterFD(int fd, int flags = wxSelectAll);
  70
  71     // return handler for descriptor or null if fd is not registered
  72     wxFDIOHandler* FindHandler(int fd);
  73
  74     // calls select on registered descriptors and
  75     void RunLoop(int timeout = wxSELECT_TIMEOUT_INFINITE);
  76
  77 protected:
  78     wxSelectDispatcher() { m_maxFD = -1; }
  79
  80 private:
  81     void ProcessSets(fd_set* readset, fd_set* writeset, fd_set* exeptset, int max_fd);
  82
  83     fd_set m_readset;
  84     fd_set m_writeset;
  85     fd_set m_exeptset;
  86
  87     int m_maxFD;
  88     wxFDIOHandlerMap m_handlers;
  89
  90     static wxSelectDispatcher *ms_instance;
  91
  92     friend class wxSelectDispatcherModule;
  93 };
  94
  95
  96 #endif // _WX_PRIVATE_SOCKETEVTDISPATCH_H_