118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
/*
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DependencyFactory - managing the lifecycle of singletons and dependencies
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Copyright (C) Lumiera.org
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2013, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file dependency-factory.cpp
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** This compilation unit holds the common backend of all singleton and dependency factories.
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** Especially the code for tracking and clean-up of all service instance is located here.
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** This clean-up is triggered by the invocation of \c ~AutoDestructor() -- at this point
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** a special \c shutdownLock is set, which prevents any further singleton service creation.
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**
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*/
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#include "lib/dependency-factory.hpp"
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#include "lib/del-stash.hpp"
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namespace lib {
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namespace error = lumiera::error;
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namespace { // private implementation details...
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class AutoDestructor
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{
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DelStash destructionExecutor_;
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static bool shutdownLock;
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static AutoDestructor&
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instance()
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{
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static AutoDestructor _instance_;
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return _instance_;
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}
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~AutoDestructor()
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{
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shutdownLock = true;
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}
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static void
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__lifecycleCheck()
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{
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if (shutdownLock)
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throw error::Fatal("Attempt to re-access a service, "
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"while Application is already in shutdown"
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,error::LUMIERA_ERROR_LIFECYCLE);
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}
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public:
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static void
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schedule (void* object, DependencyFactory::KillFun customDeleter)
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{
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__lifecycleCheck();
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instance().destructionExecutor_.manage (object, customDeleter);
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}
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static void
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kill (void* object)
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{
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__lifecycleCheck();
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instance().destructionExecutor_.kill (object);
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}
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};
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bool AutoDestructor::shutdownLock = false;
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}
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/** explicitly shut down and destroy a service instance.
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* This can be used to re-start a service; by default, all
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* services are created on-demand and stay alive until
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* application shutdown. But a service deconfigured
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* through this function is destroyed right away.
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*/
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void
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DependencyFactory::deconfigure (void* existingInstance)
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{
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AutoDestructor::kill (existingInstance);
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}
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/** hook to install a deleter function to clean up a service object.
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* The standard constructor function uses this hook to schedule the
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* destructor invocation on application shutdown; custom constructors
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* are free to use this mechanism (or care for clean-up otherwise)
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* @see lib::DelStash
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*/
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void
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DependencyFactory::scheduleDestruction (void* object, KillFun customDeleter)
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{
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AutoDestructor::schedule (object, customDeleter);
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}
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}// lib
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