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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
//
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// NotificationStrategy.h
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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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// SPDX-License-Identifier: BSL-1.0
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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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using DelegateHandle = TDelegate*;
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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 DelegateHandle 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 remove(DelegateHandle delegateHandle) = 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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template <class TDelegate>
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class NotificationStrategy<void, TDelegate>
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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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using DelegateHandle = TDelegate*;
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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) = 0;
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/// Sends a notification to all registered delegates.
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virtual DelegateHandle 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 remove(DelegateHandle delegateHandle) = 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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