Dogcows Code - chaz/yoink/blob - src/Moof/Dispatch.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
   6
   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
   9
  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
  15
  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  20  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  27 *******************************************************************************/
  28
  29 #ifndef _MOOF_DISPATCH_HH_
  30 #define _MOOF_DISPATCH_HH_
  31
  32 #include <string>
  33
  34 #include <boost/bind.hpp>
  35 #include <boost/function.hpp>
  36 #include <boost/shared_ptr.hpp>
  37
  38
  39 namespace Mf {
  40
  41
  42 /**
  43  * Dispatcher of messages to interested parties.
  44  */
  45
  46 class Dispatch
  47 {
  48         class Impl;
  49         boost::shared_ptr<Impl> mImpl;
  50
  51         void removeHandler(unsigned id);
  52
  53 public:
  54
  55         /**
  56          * Interface for a notification class.
  57          */
  58
  59         class Message
  60         {
  61         public:
  62                 virtual ~Message() {};
  63         };
  64
  65
  66         class Handler
  67         {
  68         public:
  69
  70                 Handler() :
  71                         mDispatch(0),
  72                         mId(0) {}
  73
  74                 Handler(Impl* dispatch, unsigned id) :
  75                         mDispatch(dispatch),
  76                         mId(id) {}
  77
  78                 Handler(const Handler& handler) :
  79                         mDispatch(handler.mDispatch),
  80                         mId(handler.mId)
  81                 {
  82                         handler.mId = 0;
  83                 }
  84
  85                 ~Handler();
  86
  87                 Handler& operator = (const Handler& handler)
  88                 {
  89                         mDispatch = handler.mDispatch;
  90                         mId = handler.mId;
  91                         handler.mId = 0;
  92                         return *this;
  93                 }
  94
  95                 unsigned getId() const
  96                 {
  97                         return mId;
  98                 }
  99
 100         private:
 101
 102                 Impl*                           mDispatch;
 103                 mutable unsigned        mId;
 104
 105         };
 106
 107         typedef boost::function<void(const Message*)> Function;
 108
 109
 110         Dispatch();
 111         ~Dispatch();
 112
 113         // create and/or get a global instance
 114         static Dispatch& getInstance();
 115
 116         Handler addHandler(const std::string& event, const Function& callback);
 117         Handler addHandler(const std::string& event, const Function& callback,
 118                         Handler handler);
 119
 120         void dispatch(const std::string& event, const Message* message = 0);
 121 };
 122
 123
 124 } // namespace Mf
 125
 126 #endif // _MOOF_DISPATCH_HH_
 127
 128 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 129