Dogcows Code - chaz/yoink/blob - src/Moof/Dispatcher.cc

   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
  23  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 *******************************************************************************/
  28
  29 #include <map>
  30
  31 #include "Dispatcher.hh"
  32
  33 #include <iostream>
  34
  35
  36 namespace Mf {
  37
  38
  39 Notification::~Notification() {}
  40
  41
  42 struct Dispatcher::Impl
  43 {
  44         Impl() :
  45                 id(1) {}
  46
  47         Dispatcher::Handler getNewHandler()
  48         {
  49                 id += 2;
  50                 return (Dispatcher::Handler)id;
  51         }
  52
  53         typedef std::pair<Dispatcher::Handler,Dispatcher::Function>     Callback;
  54         typedef std::multimap<std::string,Callback>                                     CallbackLookup;
  55         typedef CallbackLookup::iterator                                                        CallbackIter;
  56
  57         typedef std::multimap<Dispatcher::Handler,std::string>          HandlerLookup;
  58         typedef HandlerLookup::iterator                                                         HandlerIter;
  59
  60
  61         inline Handler addHandler(const std::string& message,
  62                         const Function& callback, Handler id)
  63         {
  64                 callbacks.insert(std::make_pair(message, std::make_pair(id, callback)));
  65                 handlers.insert(std::make_pair(id, message));
  66
  67                 return id;
  68         }
  69
  70         inline void removeHandler(Handler id)
  71         {
  72                 std::pair<HandlerIter,HandlerIter> matching(handlers.equal_range(id));
  73
  74                 for (HandlerIter it = matching.first; it != matching.second; ++it)
  75                 {
  76                         CallbackIter first = callbacks.find((*it).second);
  77                         CallbackIter last = callbacks.end();
  78
  79                         for (CallbackIter jt = first; jt != last; ++jt)
  80                         {
  81                                 if (((*jt).second).first == id)
  82                                 {
  83                                         callbacks.erase(jt);
  84                                         break;
  85                                 }
  86                         }
  87                 }
  88
  89                 handlers.erase(id);
  90         }
  91
  92         unsigned long   id;
  93
  94         CallbackLookup  callbacks;
  95         HandlerLookup   handlers;
  96 };
  97
  98
  99 Dispatcher::Dispatcher() :
 100         impl_(new Dispatcher::Impl) {}
 101
 102 Dispatcher::~Dispatcher() {}
 103
 104
 105 Dispatcher& Dispatcher::getInstance()
 106 {
 107         static Dispatcher dispatcher;
 108         return dispatcher;
 109 }
 110
 111
 112 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 113                 const Function& callback)
 114 {
 115         return addHandler(message, callback, impl_->getNewHandler());
 116 }
 117
 118 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 119                 const Function& callback, Handler id)
 120 {
 121         // pass through
 122         return impl_->addHandler(message, callback, id);
 123 }
 124
 125
 126 void Dispatcher::removeHandler(Handler id)
 127 {
 128         // pass through
 129         return impl_->removeHandler(id);
 130 }
 131
 132
 133 void Dispatcher::dispatch(const std::string& message, const Notification* param)
 134 {
 135         std::pair<Impl::CallbackIter,Impl::CallbackIter>
 136                 callbacks(impl_->callbacks.equal_range(message));
 137
 138         for (Impl::CallbackIter it = callbacks.first; it != callbacks.second; ++it)
 139         {
 140                 Function callback = ((*it).second).second;
 141                 callback(param);
 142         }
 143 }
 144
 145
 146 } // namespace Mf
 147
 148 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 149