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117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
//
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// ActiveDispatcher.h
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//
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// Library: Foundation
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// Package: Threading
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// Module: ActiveObjects
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//
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// Definition of the ActiveDispatcher class.
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//
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// Copyright (c) 2006-2007, 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_ActiveDispatcher_INCLUDED
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#define Foundation_ActiveDispatcher_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Runnable.h"
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#include "Poco/Thread.h"
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#include "Poco/ActiveStarter.h"
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#include "Poco/ActiveRunnable.h"
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#include "Poco/NotificationQueue.h"
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namespace Poco {
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class Foundation_API ActiveDispatcher: protected Runnable
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/// This class is used to implement an active object
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/// with strictly serialized method execution.
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///
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/// An active object, which is an ordinary object
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/// containing ActiveMethod members, executes all
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/// active methods in their own thread.
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/// This behavior does not fit the "classic"
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/// definition of an active object, which serializes
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/// the execution of active methods (in other words,
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/// only one active method can be running at any given
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/// time).
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///
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/// Using this class as a base class, the serializing
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/// behavior for active objects can be implemented.
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///
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/// The following example shows how this is done:
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///
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/// class ActiveObject: public ActiveDispatcher
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/// {
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/// public:
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/// ActiveObject():
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/// exampleActiveMethod(this, &ActiveObject::exampleActiveMethodImpl)
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/// {
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/// }
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///
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/// ActiveMethod<std::string, std::string, ActiveObject, ActiveStarter<ActiveDispatcher>> exampleActiveMethod;
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///
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/// protected:
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/// std::string exampleActiveMethodImpl(const std::string& arg)
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/// {
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/// ...
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/// }
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/// };
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///
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/// The only things different from the example in
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/// ActiveMethod is that the ActiveObject in this case
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/// inherits from ActiveDispatcher, and that the ActiveMethod
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/// template for exampleActiveMethod has an additional parameter,
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/// specifying the specialized ActiveStarter for ActiveDispatcher.
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{
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public:
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ActiveDispatcher();
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/// Creates the ActiveDispatcher.
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ActiveDispatcher(Thread::Priority prio);
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/// Creates the ActiveDispatcher and sets
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/// the priority of its thread.
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virtual ~ActiveDispatcher();
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/// Destroys the ActiveDispatcher.
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void start(ActiveRunnableBase::Ptr pRunnable);
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/// Adds the Runnable to the dispatch queue.
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void cancel();
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/// Cancels all queued methods.
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protected:
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void run();
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void stop();
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private:
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Thread _thread;
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NotificationQueue _queue;
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};
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template <>
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class ActiveStarter<ActiveDispatcher>
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/// A specialization of ActiveStarter
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/// for ActiveDispatcher.
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{
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public:
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static void start(ActiveDispatcher* pOwner, ActiveRunnableBase::Ptr pRunnable)
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{
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pOwner->start(pRunnable);
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}
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};
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} // namespace Poco
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#endif // Foundation_ActiveDispatcher_INCLUDED
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