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88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
//
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// NotificationStrategy.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/NotificationStrategy.h#2 $
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//
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// Library: Foundation
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// Package: Events
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// Module: NotificationStrategy
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//
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// Definition of the NotificationStrategy interface.
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//
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// Copyright (c) 2006-2011, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_NotificationStrategy_INCLUDED
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#define Foundation_NotificationStrategy_INCLUDED
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#include "Poco/Foundation.h"
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namespace Poco {
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template <class TArgs, class TDelegate>
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class NotificationStrategy
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/// The interface that all notification strategies must implement.
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///
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/// Note: Event is based on policy-driven design, so every strategy implementation
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/// must provide all the methods from this interface (otherwise: compile errors)
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/// but does not need to inherit from NotificationStrategy.
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{
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public:
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NotificationStrategy()
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{
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}
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virtual ~NotificationStrategy()
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{
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}
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virtual void notify(const void* sender, TArgs& arguments) = 0;
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/// Sends a notification to all registered delegates.
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virtual void add(const TDelegate& delegate) = 0;
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/// Adds a delegate to the strategy.
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virtual void remove(const TDelegate& delegate) = 0;
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/// Removes a delegate from the strategy, if found.
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/// Does nothing if the delegate has not been added.
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virtual void clear() = 0;
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/// Removes all delegates from the strategy.
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virtual bool empty() const = 0;
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/// Returns false if the strategy contains at least one delegate.
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};
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} // namespace Poco
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#endif // Foundation_NotificationStrategy_INCLUDED
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