include/lib/base/message.h

   1 #ifndef __lib_base_message_h
   2 #define __lib_base_message_h
   3
   4 #include <lib/base/ebase.h>
   5 #include <unistd.h>
   6 #include <lib/system/elock.h>
   7
   8 /**
   9  * \brief A generic messagepump.
  10  *
  11  * You can send and receive messages with this class. Internally a fifo is used,
  12  * so you can use them together with a \c eMainloop.
  13  */
  14 class eMessagePump
  15 {
  16         int fd[2];
  17         eLock content;
  18         int ismt;
  19 public:
  20         eMessagePump(int mt=0);
  21         virtual ~eMessagePump();
  22         int send(const void *data, int len);
  23         int recv(void *data, int len); // blockierend
  24         int getInputFD() const;
  25         int getOutputFD() const;
  26 };
  27
  28 /**
  29  * \brief A messagepump with fixed-length packets.
  30  *
  31  * Based on \ref eMessagePump, with this class you can send and receive fixed size messages.
  32  * Automatically creates a eSocketNotifier and gives you a callback.
  33  */
  34 template<class T>
  35 class eFixedMessagePump: private eMessagePump, public Object
  36 {
  37         eSocketNotifier *sn;
  38         void do_recv(int)
  39         {
  40                 T msg;
  41                 recv(&msg, sizeof(msg));
  42                 /*emit*/ recv_msg(msg);
  43         }
  44 public:
  45         Signal1<void,const T&> recv_msg;
  46         void send(const T &msg)
  47         {
  48                 eMessagePump::send(&msg, sizeof(msg));
  49         }
  50         eFixedMessagePump(eMainloop *context, int mt): eMessagePump(mt)
  51         {
  52                 sn=new eSocketNotifier(context, getOutputFD(), eSocketNotifier::Read);
  53                 CONNECT(sn->activated, eFixedMessagePump<T>::do_recv);
  54                 sn->start();
  55         }
  56         ~eFixedMessagePump()
  57         {
  58                 delete sn;
  59                 sn=0;
  60         }
  61         void start() { if (sn) sn->start(); }
  62         void stop() { if (sn) sn->stop(); }
  63 };
  64
  65 #endif