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+//
+// SocketNotifier.h
+//
+// Library: Net
+// Package: Reactor
+// Module:  SocketNotifier
+//
+// Definition of the SocketNotifier class.
+//
+// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Net_SocketNotifier_INCLUDED
+#define Net_SocketNotifier_INCLUDED
+
+
+#include "Poco/Net/Net.h"
+#include "Poco/Net/Socket.h"
+#include "Poco/RefCountedObject.h"
+#include "Poco/NotificationCenter.h"
+#include "Poco/Observer.h"
+#include <set>
+
+
+namespace Poco {
+namespace Net {
+
+
+class Socket;
+class SocketReactor;
+class SocketNotification;
+
+
+class Net_API SocketNotifier: public Poco::RefCountedObject
+	/// This class is used internally by SocketReactor
+	/// to notify registered event handlers of socket events.
+{
+public:
+	explicit SocketNotifier(const Socket& socket);
+		/// Creates the SocketNotifier for the given socket.
+		
+	void addObserver(SocketReactor* pReactor, const Poco::AbstractObserver& observer);
+		/// Adds the given observer. 
+		
+	void removeObserver(SocketReactor* pReactor, const Poco::AbstractObserver& observer);
+		/// Removes the given observer. 
+		
+	bool hasObserver(const Poco::AbstractObserver& observer) const;
+		/// Returns true if the given observer is registered.
+		
+	bool accepts(SocketNotification* pNotification);
+		/// Returns true if there is at least one observer for the given notification.
+		
+	void dispatch(SocketNotification* pNotification);
+		/// Dispatches the notification to all observers.
+		
+	bool hasObservers() const;
+		/// Returns true if there are subscribers.
+		
+	std::size_t countObservers() const;
+		/// Returns the number of subscribers;
+
+protected:
+	~SocketNotifier();
+		/// Destroys the SocketNotifier.
+
+private:
+	typedef std::multiset<SocketNotification*> EventSet;
+
+	EventSet                 _events;
+	Poco::NotificationCenter _nc;
+	Socket                   _socket;
+};
+
+
+//
+// inlines
+//
+inline bool SocketNotifier::accepts(SocketNotification* pNotification)
+{
+	return _events.find(pNotification) != _events.end();
+}
+
+
+inline bool SocketNotifier::hasObserver(const Poco::AbstractObserver& observer) const
+{
+	return _nc.hasObserver(observer);
+}
+
+
+inline bool SocketNotifier::hasObservers() const
+{
+	return _nc.hasObservers();
+}
+
+
+inline std::size_t SocketNotifier::countObservers() const
+{
+	return _nc.countObservers();
+}
+
+
+} } // namespace Poco::Net
+
+
+#endif // Net_SocketNotifier_INCLUDED