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 Notification::~Notification() {}
  38
  39
  40 class Dispatcher::DispatcherImpl
  41 {
  42 public:
  43         DispatcherImpl() : 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;
  52         typedef std::multimap<std::string,Callback>                                     CallbackLookup;
  53         typedef CallbackLookup::iterator                                                        CallbackIter;
  54
  55         typedef std::multimap<Dispatcher::Handler,std::string>          HandlerLookup;
  56         typedef HandlerLookup::iterator                                                         HandlerIter;
  57
  58         unsigned long long      id;
  59
  60         CallbackLookup          callbacks;
  61         HandlerLookup           handlers;
  62 };
  63
  64
  65 Dispatcher::Dispatcher() :
  66         impl_(new Dispatcher::DispatcherImpl) {}
  67
  68
  69 // TODO these methods are ugly
  70
  71 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
  72                 const Function& callback)
  73 {
  74         return addHandler(message, callback, impl_->getNewHandlerID());
  75 }
  76
  77 Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
  78                 const Function& callback, Handler id)
  79 {
  80         std::pair<std::string,Dispatcher::DispatcherImpl::Callback>
  81                 callbackPair(message, Dispatcher::DispatcherImpl::Callback(id, callback));
  82
  83         std::pair<Handler,std::string> handlerPair(id, message);
  84
  85         impl_->callbacks.insert(callbackPair);
  86         impl_->handlers.insert(handlerPair);
  87
  88         return id;
  89 }
  90
  91
  92 void Dispatcher::removeHandler(Handler id)
  93 {
  94         std::pair<Dispatcher::DispatcherImpl::HandlerIter,Dispatcher::DispatcherImpl::HandlerIter>
  95                 handlers(impl_->handlers.equal_range(id));
  96
  97         Dispatcher::DispatcherImpl::HandlerIter it;
  98         for (it = handlers.first; it != handlers.second; ++it)
  99         {
 100                 Dispatcher::DispatcherImpl::CallbackIter first = impl_->callbacks.find((*it).second);
 101                 Dispatcher::DispatcherImpl::CallbackIter last = impl_->callbacks.end();
 102
 103                 Dispatcher::DispatcherImpl::CallbackIter jt;
 104                 for (jt = first; jt != last; ++jt)
 105                 {
 106                         if (((*jt).second).first == id)
 107                         {
 108                                 impl_->callbacks.erase(jt);
 109                                 break;
 110                         }
 111                 }
 112         }
 113
 114         impl_->handlers.erase(id);
 115 }
 116
 117
 118 void Dispatcher::dispatch(const std::string& message)
 119 {
 120         dispatch(message, Notification());
 121 }
 122
 123 void Dispatcher::dispatch(const std::string& message, const Notification& param)
 124 {
 125         std::pair<Dispatcher::DispatcherImpl::CallbackIter,Dispatcher::DispatcherImpl::CallbackIter>
 126                 callbacks(impl_->callbacks.equal_range(message));
 127
 128         Dispatcher::DispatcherImpl::CallbackIter it;
 129         for (it = callbacks.first; it != callbacks.second; ++it)
 130         {
 131                 Function callback = ((*it).second).second;
 132                 callback(param);
 133         }
 134 }
 135
 136
 137 } // namespace Mf
 138
 139 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 140