new classes; yajl library

[chaz/yoink] / src / dispatcher.cc

diff --git a/src/dispatcher.cc b/src/dispatcher.cc
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+
+/*******************************************************************************
+
+ 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 dc {
+
+
+notification::~notification() {}
+
+
+class dispatcher_impl
+{
+public:
+       dispatcher_impl() : id(1) {}
+
+       dispatcher::handler getNewHandlerID()
+       {
+               id += 4;
+               return (dispatcher::handler)id;
+       }
+
+       typedef std::pair<dispatcher::handler,dispatcher::function> callback_t;
+       typedef std::multimap<std::string,callback_t> callback_lookup_t;
+       typedef callback_lookup_t::iterator callback_it_t;
+
+       typedef std::multimap<dispatcher::handler,std::string> handler_lookup_t;
+       typedef handler_lookup_t::iterator handler_it_t;
+
+       unsigned long long id;
+
+       callback_lookup_t callbacks;
+       handler_lookup_t handlers;
+};
+
+
+dispatcher::dispatcher() : impl(new dispatcher_impl) {}
+
+
+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_impl::callback_t>
+               callbackPair(message, dispatcher_impl::callback_t(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_impl::handler_it_t,dispatcher_impl::handler_it_t>
+               handlers(impl->handlers.equal_range(id));
+
+       dispatcher_impl::handler_it_t i;
+       for (i = handlers.first; i != handlers.second; i++)
+       {
+               dispatcher_impl::callback_it_t it = impl->callbacks.find((*i).second);
+               dispatcher_impl::callback_it_t last = impl->callbacks.end();
+
+               dispatcher_impl::callback_it_t 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_impl::callback_it_t,dispatcher_impl::callback_it_t>
+               callbacks(impl->callbacks.equal_range(message));
+
+       dispatcher_impl::callback_it_t i;
+       for (i = callbacks.first; i != callbacks.second; i++)
+       {
+               function callback = ((*i).second).second;
+               callback(param);
+       }
+}
+
+
+} // namespace dc
+