foundational changes; tying up some loose ends

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

diff --git a/src/Moof/Dispatch.cc b/src/Moof/Dispatch.cc
new file mode 100644 (file)
index 0000000..17f8f17
--- /dev/null
+++ b/src/Moof/Dispatch.cc
@@ -0,0 +1,165 @@
+
+/*******************************************************************************
+
+ 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 "Dispatch.hh"
+
+
+namespace Mf {
+
+
+class Dispatch::Impl
+{
+public:
+
+       Impl() :
+               mId(0) {}
+
+       Dispatch::Handler getNewHandler()
+       {
+               ++mId;
+               //return Dispatch::Handler(this, mId);
+               Dispatch::Handler handler(this, mId);
+               return handler;
+       }
+
+       typedef std::pair<unsigned,Dispatch::Function>  Callback;
+       typedef std::multimap<std::string,Callback>             CallbackLookup;
+       typedef CallbackLookup::iterator                                CallbackIter;
+
+       typedef std::multimap<unsigned,std::string>             HandlerLookup;
+       typedef HandlerLookup::iterator                                 HandlerIter;
+
+
+       inline Handler addHandler(const std::string& event,
+                       const Function& callback, Handler handler)
+       {
+               mCallbacks.insert(std::make_pair(event,
+                                       std::make_pair(handler.getId(), callback)));
+               mHandlers.insert(std::make_pair(handler.getId(), event));
+
+               return handler;
+       }
+
+       inline void removeHandler(unsigned id)
+       {
+               std::pair<HandlerIter,HandlerIter> matching(mHandlers.equal_range(id));
+
+               for (HandlerIter it = matching.first; it != matching.second; ++it)
+               {
+                       CallbackIter first = mCallbacks.find((*it).second);
+                       CallbackIter last = mCallbacks.end();
+
+                       for (CallbackIter jt = first; jt != last; ++jt)
+                       {
+                               if ((*jt).second.first == id)
+                               {
+                                       mCallbacks.erase(jt);
+                                       break;
+                               }
+                       }
+               }
+
+               mHandlers.erase(id);
+       }
+
+       void dispatch(const std::string& event, const Message* message)
+       {
+               std::pair<CallbackIter,CallbackIter>
+                       callbacks(mCallbacks.equal_range(event));
+
+               for (CallbackIter it = callbacks.first; it != callbacks.second; ++it)
+               {
+                       Function callback = (*it).second.second;
+                       callback(message);
+               }
+       }
+
+
+       unsigned                mId;
+
+       CallbackLookup  mCallbacks;
+       HandlerLookup   mHandlers;
+};
+
+
+Dispatch::Handler::~Handler()
+{
+       if (mId)
+       {
+               mDispatch->removeHandler(mId);
+       }
+}
+
+
+Dispatch::Dispatch() :
+       mImpl(new Dispatch::Impl) {}
+
+Dispatch::~Dispatch() {}
+
+
+Dispatch& Dispatch::getInstance()
+{
+       static Dispatch dispatch;
+       return dispatch;
+}
+
+
+Dispatch::Handler Dispatch::addHandler(const std::string& event,
+               const Function& callback)
+{
+       return addHandler(event, callback, mImpl->getNewHandler());
+}
+
+Dispatch::Handler Dispatch::addHandler(const std::string& event,
+               const Function& callback, Handler handler)
+{
+       // pass through
+       return mImpl->addHandler(event, callback, handler);
+}
+
+
+void Dispatch::removeHandler(unsigned id)
+{
+       // pass through
+       return mImpl->removeHandler(id);
+}
+
+
+void Dispatch::dispatch(const std::string& event, const Message* message)
+{
+       // pass through
+       mImpl->dispatch(event, message);
+}
+
+
+} // namespace Mf
+
+/** vim: set ts=4 sw=4 tw=80: *************************************************/
+