Dogcows Code - chaz/yoink/blob - src/Moof/Dispatch.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 "Dispatch.hh"
  32
  33
  34 namespace Mf {
  35
  36
  37 class Dispatch::Impl
  38 {
  39 public:
  40
  41         Impl() :
  42                 mId(0) {}
  43
  44         Dispatch::Handler getNewHandler()
  45         {
  46                 ++mId;
  47                 //return Dispatch::Handler(this, mId);
  48                 Dispatch::Handler handler(this, mId);
  49                 return handler;
  50         }
  51
  52         typedef std::pair<unsigned,Dispatch::Function>  Callback;
  53         typedef std::multimap<std::string,Callback>             CallbackLookup;
  54         typedef CallbackLookup::iterator                                CallbackIter;
  55
  56         typedef std::multimap<unsigned,std::string>             HandlerLookup;
  57         typedef HandlerLookup::iterator                                 HandlerIter;
  58
  59
  60         inline Handler addHandler(const std::string& event,
  61                         const Function& callback, Handler handler)
  62         {
  63                 mCallbacks.insert(std::make_pair(event,
  64                                         std::make_pair(handler.getId(), callback)));
  65                 mHandlers.insert(std::make_pair(handler.getId(), event));
  66
  67                 return handler;
  68         }
  69
  70         inline void removeHandler(unsigned id)
  71         {
  72                 std::pair<HandlerIter,HandlerIter> matching(mHandlers.equal_range(id));
  73
  74                 for (HandlerIter it = matching.first; it != matching.second; ++it)
  75                 {
  76                         CallbackIter first = mCallbacks.find((*it).second);
  77                         CallbackIter last = mCallbacks.end();
  78
  79                         for (CallbackIter jt = first; jt != last; ++jt)
  80                         {
  81                                 if ((*jt).second.first == id)
  82                                 {
  83                                         mCallbacks.erase(jt);
  84                                         break;
  85                                 }
  86                         }
  87                 }
  88
  89                 mHandlers.erase(id);
  90         }
  91
  92         void dispatch(const std::string& event, const Message* message)
  93         {
  94                 std::pair<CallbackIter,CallbackIter>
  95                         callbacks(mCallbacks.equal_range(event));
  96
  97                 for (CallbackIter it = callbacks.first; it != callbacks.second; ++it)
  98                 {
  99                         Function callback = (*it).second.second;
 100                         callback(message);
 101                 }
 102         }
 103
 104
 105         unsigned                mId;
 106
 107         CallbackLookup  mCallbacks;
 108         HandlerLookup   mHandlers;
 109 };
 110
 111
 112 Dispatch::Handler::~Handler()
 113 {
 114         if (mId)
 115         {
 116                 mDispatch->removeHandler(mId);
 117         }
 118 }
 119
 120
 121 Dispatch::Dispatch() :
 122         mImpl(new Dispatch::Impl) {}
 123
 124 Dispatch::~Dispatch() {}
 125
 126
 127 Dispatch& Dispatch::getInstance()
 128 {
 129         static Dispatch dispatch;
 130         return dispatch;
 131 }
 132
 133
 134 Dispatch::Handler Dispatch::addHandler(const std::string& event,
 135                 const Function& callback)
 136 {
 137         return addHandler(event, callback, mImpl->getNewHandler());
 138 }
 139
 140 Dispatch::Handler Dispatch::addHandler(const std::string& event,
 141                 const Function& callback, Handler handler)
 142 {
 143         // pass through
 144         return mImpl->addHandler(event, callback, handler);
 145 }
 146
 147
 148 void Dispatch::removeHandler(unsigned id)
 149 {
 150         // pass through
 151         return mImpl->removeHandler(id);
 152 }
 153
 154
 155 void Dispatch::dispatch(const std::string& event, const Message* message)
 156 {
 157         // pass through
 158         mImpl->dispatch(event, message);
 159 }
 160
 161
 162 } // namespace Mf
 163
 164 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 165