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
  34 namespace Mf {
  35
  36
  37 class Dispatcher::Impl
  38 {
  39         friend class Dispatcher;
  40
  41         Impl() :
  42                 mId(1) {}
  43
  44         Dispatcher::Handler getNewHandler()
  45         {
  46                 mId += 2;
  47                 return (Dispatcher::Handler)mId;
  48         }
  49
  50         typedef std::pair<Dispatcher::Handler,Dispatcher::Function>     Callback;
  51         typedef std::multimap<std::string,Callback>                                     CallbackLookup;
  52         typedef CallbackLookup::iterator                                                        CallbackIter;
  53
  54         typedef std::multimap<Dispatcher::Handler,std::string>          HandlerLookup;
  55         typedef HandlerLookup::iterator                                                         HandlerIter;
  56
  57
  58         inline Handler addHandler(const std::string& message,
  59                         const Function& callback, Handler id)
  60         {
  61                 mCallbacks.insert(std::make_pair(message, std::make_pair(id, callback)));
  62                 mHandlers.insert(std::make_pair(id, message));
  63
  64                 return id;
  65         }
  66
  67         inline void removeHandler(Handler id)
  68         {
  69                 std::pair<HandlerIter,HandlerIter> matching(mHandlers.equal_range(id));
  70
  71                 for (HandlerIter it = matching.first; it != matching.second; ++it)
  72                 {
  73                         CallbackIter first = mCallbacks.find((*it).second);
  74                         CallbackIter last = mCallbacks.end();
  75
  76                         for (CallbackIter jt = first; jt != last; ++jt)
  77                         {
  78                                 if ((*jt).second.first == id)
  79                                 {
  80                                         mCallbacks.erase(jt);
  81                                         break;
  82                                 }
  83                         }
  84                 }
  85
  86                 mHandlers.erase(id);
  87         }
  88
  89         void dispatch(const std::string& message, const Notification* param)
  90         {
  91                 std::pair<CallbackIter,CallbackIter>
  92                         callbacks(mCallbacks.equal_range(message));
  93
  94                 for (CallbackIter it = callbacks.first; it != callbacks.second; ++it)
  95                 {
  96                         Function callback = (*it).second.second;
  97                         callback(param);
  98                 }
  99         }
 100
 101
 102         unsigned long   mId;
 103
 104         CallbackLookup  mCallbacks;
 105         HandlerLookup   mHandlers;
 106 };
 107
 108
 109 Dispatcher::Dispatcher() :
 110         mImpl(new Dispatcher::Impl) {}
 111
 112 Dispatcher::~Dispatcher() {}
 113
 114
 115 Dispatcher& Dispatcher::getInstance()
 116 {
 117         static Dispatcher dispatcher;
 118         return dispatcher;
 119 }
 120
 121
 122 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 123                 const Function& callback)
 124 {
 125         return addHandler(message, callback, mImpl->getNewHandler());
 126 }
 127
 128 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
 129                 const Function& callback, Handler id)
 130 {
 131         // pass through
 132         return mImpl->addHandler(message, callback, id);
 133 }
 134
 135
 136 void Dispatcher::removeHandler(Handler id)
 137 {
 138         // pass through
 139         return mImpl->removeHandler(id);
 140 }
 141
 142
 143 void Dispatcher::dispatch(const std::string& message, const Notification* param)
 144 {
 145         // pass through
 146         mImpl->dispatch(message, param);
 147 }
 148
 149
 150 } // namespace Mf
 151
 152 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 153