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