foundational changes; tying up some loose ends

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

diff --git a/src/Moof/Dispatch.hh b/src/Moof/Dispatch.hh
new file mode 100644 (file)
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--- /dev/null
+++ b/src/Moof/Dispatch.hh
@@ -0,0 +1,129 @@
+
+/*******************************************************************************
+
+ 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.
+
+*******************************************************************************/
+
+#ifndef _MOOF_DISPATCH_HH_
+#define _MOOF_DISPATCH_HH_
+
+#include <string>
+
+#include <boost/bind.hpp>
+#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
+
+
+namespace Mf {
+
+
+/**
+ * Dispatcher of messages to interested parties.
+ */
+
+class Dispatch
+{
+       class Impl;
+       boost::shared_ptr<Impl> mImpl;
+
+       void removeHandler(unsigned id);
+
+public:
+
+       /**
+        * Interface for a notification class.
+        */
+
+       class Message
+       {
+       public:
+               virtual ~Message() {};
+       };
+
+
+       class Handler
+       {
+       public:
+
+               Handler() :
+                       mDispatch(0),
+                       mId(0) {}
+
+               Handler(Impl* dispatch, unsigned id) :
+                       mDispatch(dispatch),
+                       mId(id) {}
+
+               Handler(const Handler& handler) :
+                       mDispatch(handler.mDispatch),
+                       mId(handler.mId)
+               {
+                       handler.mId = 0;
+               }
+
+               ~Handler();
+
+               Handler& operator = (const Handler& handler)
+               {
+                       mDispatch = handler.mDispatch;
+                       mId = handler.mId;
+                       handler.mId = 0;
+                       return *this;
+               }
+
+               unsigned getId() const
+               {
+                       return mId;
+               }
+       
+       private:
+
+               Impl*                           mDispatch;
+               mutable unsigned        mId;
+
+       };
+
+       typedef boost::function<void(const Message*)> Function;
+
+
+       Dispatch();
+       ~Dispatch();
+
+       // create and/or get a global instance
+       static Dispatch& getInstance();
+
+       Handler addHandler(const std::string& event, const Function& callback);
+       Handler addHandler(const std::string& event, const Function& callback,
+                       Handler handler);
+
+       void dispatch(const std::string& event, const Message* message = 0);
+};
+
+
+} // namespace Mf
+
+#endif // _MOOF_DISPATCH_HH_
+
+/** vim: set ts=4 sw=4 tw=80: *************************************************/
+