extreme refactoring

[chaz/yoink] / src / Moof / Dispatcher.cc

diff --git a/src/Moof/Dispatcher.cc b/src/Moof/Dispatcher.cc
new file mode 100644 (file)
index 0000000..fa7b328
--- /dev/null
+++ b/src/Moof/Dispatcher.cc
@@ -0,0 +1,140 @@
+
+/*******************************************************************************
+
+ Copyright (c) 2009, Charles McGarvey
+ All rights reserved.
+ 
+ Redistribution   and   use  in  source  and  binary  forms,  with  or  without
+ modification, are permitted provided that the following conditions are met:
+ 
+   * Redistributions  of  source  code  must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+   * Redistributions  in binary form must reproduce the above copyright notice,
+     this  list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+ 
+ THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*******************************************************************************/
+
+#include <map>
+
+#include "Dispatcher.hh"
+
+
+namespace Mf {
+
+
+Notification::~Notification() {}
+
+
+class Dispatcher::DispatcherImpl
+{
+public:
+       DispatcherImpl() : id(1) {}
+
+       Dispatcher::Handler getNewHandlerID()
+       {
+               id += 4;
+               return (Dispatcher::Handler)id;
+       }
+
+       typedef std::pair<Dispatcher::Handler,Dispatcher::Function>     Callback;
+       typedef std::multimap<std::string,Callback>                                     CallbackLookup;
+       typedef CallbackLookup::iterator                                                        CallbackIter;
+
+       typedef std::multimap<Dispatcher::Handler,std::string>          HandlerLookup;
+       typedef HandlerLookup::iterator                                                         HandlerIter;
+
+       unsigned long long      id;
+
+       CallbackLookup          callbacks;
+       HandlerLookup           handlers;
+};
+
+
+Dispatcher::Dispatcher() :
+       impl_(new Dispatcher::DispatcherImpl) {}
+
+
+// TODO these methods are ugly
+
+Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
+               const Function& callback)
+{
+       return addHandler(message, callback, impl_->getNewHandlerID());
+}
+
+Dispatcher::Handler Dispatcher::addHandler(const std::string& message,
+               const Function& callback, Handler id)
+{
+       std::pair<std::string,Dispatcher::DispatcherImpl::Callback>
+               callbackPair(message, Dispatcher::DispatcherImpl::Callback(id, callback));
+
+       std::pair<Handler,std::string> handlerPair(id, message);
+
+       impl_->callbacks.insert(callbackPair);
+       impl_->handlers.insert(handlerPair);
+
+       return id;
+}
+
+
+void Dispatcher::removeHandler(Handler id)
+{
+       std::pair<Dispatcher::DispatcherImpl::HandlerIter,Dispatcher::DispatcherImpl::HandlerIter>
+               handlers(impl_->handlers.equal_range(id));
+
+       Dispatcher::DispatcherImpl::HandlerIter i;
+       for (i = handlers.first; i != handlers.second; i++)
+       {
+               Dispatcher::DispatcherImpl::CallbackIter it = impl_->callbacks.find((*i).second);
+               Dispatcher::DispatcherImpl::CallbackIter last = impl_->callbacks.end();
+
+               Dispatcher::DispatcherImpl::CallbackIter j;
+               for (j = it; j != last; j++)
+               {
+                       if (((*j).second).first == id)
+                       {
+                               impl_->callbacks.erase(j);
+                               break;
+                       }
+               }
+       }
+       
+       impl_->handlers.erase(id);
+}
+
+
+void Dispatcher::dispatch(const std::string& message)
+{
+       dispatch(message, Notification());
+}
+
+void Dispatcher::dispatch(const std::string& message, const Notification& param)
+{
+       std::pair<Dispatcher::DispatcherImpl::CallbackIter,Dispatcher::DispatcherImpl::CallbackIter>
+               callbacks(impl_->callbacks.equal_range(message));
+
+       Dispatcher::DispatcherImpl::CallbackIter i;
+       for (i = callbacks.first; i != callbacks.second; i++)
+       {
+               Function callback = ((*i).second).second;
+               callback(param);
+       }
+}
+
+
+} // namespace Mf
+
+/** vim: set ts=4 sw=4 tw=80: *************************************************/
+