Dogcows Code - chaz/yoink/blob - src/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 dc {
  35
  36
  37 notification::~notification() {}
  38
  39
  40 class dispatcher_impl
  41 {
  42 public:
  43         dispatcher_impl() : id(1) {}
  44
  45         dispatcher::handler getNewHandlerID()
  46         {
  47                 id += 4;
  48                 return (dispatcher::handler)id;
  49         }
  50
  51         typedef std::pair<dispatcher::handler,dispatcher::function> callback_t;
  52         typedef std::multimap<std::string,callback_t> callback_lookup_t;
  53         typedef callback_lookup_t::iterator callback_it_t;
  54
  55         typedef std::multimap<dispatcher::handler,std::string> handler_lookup_t;
  56         typedef handler_lookup_t::iterator handler_it_t;
  57
  58         unsigned long long id;
  59
  60         callback_lookup_t callbacks;
  61         handler_lookup_t handlers;
  62 };
  63
  64
  65 dispatcher::dispatcher() : impl(new dispatcher_impl) {}
  66
  67
  68 dispatcher::handler dispatcher::addHandler(const std::string& message,
  69                 const function& callback)
  70 {
  71         return addHandler(message, callback, impl->getNewHandlerID());
  72 }
  73
  74 dispatcher::handler dispatcher::addHandler(const std::string& message,
  75                 const function& callback, handler id)
  76 {
  77         std::pair<std::string,dispatcher_impl::callback_t>
  78                 callbackPair(message, dispatcher_impl::callback_t(id, callback));
  79
  80         std::pair<handler,std::string> handlerPair(id, message);
  81
  82         impl->callbacks.insert(callbackPair);
  83         impl->handlers.insert(handlerPair);
  84
  85         return id;
  86 }
  87
  88
  89 void dispatcher::removeHandler(handler id)
  90 {
  91         std::pair<dispatcher_impl::handler_it_t,dispatcher_impl::handler_it_t>
  92                 handlers(impl->handlers.equal_range(id));
  93
  94         dispatcher_impl::handler_it_t i;
  95         for (i = handlers.first; i != handlers.second; i++)
  96         {
  97                 dispatcher_impl::callback_it_t it = impl->callbacks.find((*i).second);
  98                 dispatcher_impl::callback_it_t last = impl->callbacks.end();
  99
 100                 dispatcher_impl::callback_it_t j;
 101                 for (j = it; j != last; j++)
 102                 {
 103                         if (((*j).second).first == id)
 104                         {
 105                                 impl->callbacks.erase(j);
 106                                 break;
 107                         }
 108                 }
 109         }
 110
 111         impl->handlers.erase(id);
 112 }
 113
 114
 115 void dispatcher::dispatch(const std::string& message)
 116 {
 117         dispatch(message, notification());
 118 }
 119
 120 void dispatcher::dispatch(const std::string& message, const notification& param)
 121 {
 122         std::pair<dispatcher_impl::callback_it_t,dispatcher_impl::callback_it_t>
 123                 callbacks(impl->callbacks.equal_range(message));
 124
 125         dispatcher_impl::callback_it_t i;
 126         for (i = callbacks.first; i != callbacks.second; i++)
 127         {
 128                 function callback = ((*i).second).second;
 129                 callback(param);
 130         }
 131 }
 132
 133
 134 } // namespace dc
 135