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::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::dispatcher_impl) {}
  66
  67
  68 // TODO these methods are ugly
  69
  70 dispatcher::handler dispatcher::addHandler(const std::string& message,
  71                 const function& callback)
  72 {
  73         return addHandler(message, callback, impl->getNewHandlerID());
  74 }
  75
  76 dispatcher::handler dispatcher::addHandler(const std::string& message,
  77                 const function& callback, handler id)
  78 {
  79         std::pair<std::string,dispatcher::dispatcher_impl::callback_t>
  80                 callbackPair(message, dispatcher::dispatcher_impl::callback_t(id, callback));
  81
  82         std::pair<handler,std::string> handlerPair(id, message);
  83
  84         impl->callbacks.insert(callbackPair);
  85         impl->handlers.insert(handlerPair);
  86
  87         return id;
  88 }
  89
  90
  91 void dispatcher::removeHandler(handler id)
  92 {
  93         std::pair<dispatcher::dispatcher_impl::handler_it_t,dispatcher::dispatcher_impl::handler_it_t>
  94                 handlers(impl->handlers.equal_range(id));
  95
  96         dispatcher::dispatcher_impl::handler_it_t i;
  97         for (i = handlers.first; i != handlers.second; i++)
  98         {
  99                 dispatcher::dispatcher_impl::callback_it_t it = impl->callbacks.find((*i).second);
 100                 dispatcher::dispatcher_impl::callback_it_t last = impl->callbacks.end();
 101
 102                 dispatcher::dispatcher_impl::callback_it_t j;
 103                 for (j = it; j != last; j++)
 104                 {
 105                         if (((*j).second).first == id)
 106                         {
 107                                 impl->callbacks.erase(j);
 108                                 break;
 109                         }
 110                 }
 111         }
 112
 113         impl->handlers.erase(id);
 114 }
 115
 116
 117 void dispatcher::dispatch(const std::string& message)
 118 {
 119         dispatch(message, notification());
 120 }
 121
 122 void dispatcher::dispatch(const std::string& message, const notification& param)
 123 {
 124         std::pair<dispatcher::dispatcher_impl::callback_it_t,dispatcher::dispatcher_impl::callback_it_t>
 125                 callbacks(impl->callbacks.equal_range(message));
 126
 127         dispatcher::dispatcher_impl::callback_it_t i;
 128         for (i = callbacks.first; i != callbacks.second; i++)
 129         {
 130                 function callback = ((*i).second).second;
 131                 callback(param);
 132         }
 133 }
 134
 135
 136 } // namespace dc
 137
 138 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 139