Ichthyostega
ff7ac5523f
This header shall provide only very fundamental metaprogramming helpers, since it is included pervasively
152 lines
5 KiB
C++
152 lines
5 KiB
C++
/*
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NodeWiring - Implementation of the node network and operation control
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Copyright (C) Lumiera.org
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2008, 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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#include "proc/engine/procnode.hpp"
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#include "proc/engine/nodewiring.hpp"
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#include "proc/engine/nodeoperation.hpp"
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#include "proc/engine/nodewiring-config.hpp"
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#include "lib/meta/typelist-manip.hpp"
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namespace proc {
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namespace engine {
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namespace config {
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using lib::meta::Flags;
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using lib::meta::CombineFlags;
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using lib::meta::DefineConfigByFlags;
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using lib::meta::Apply;
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using lib::meta::Filter;
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using lib::AllocationCluster;
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typedef Flags<CACHING,PROCESS,INPLACE>::Tuple AllFlags;
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/** build the list of all possible flag combinations */
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typedef CombineFlags<AllFlags> AllFlagCombinations;
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/** build a configuration type for each of those flag combinations */
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typedef Apply<AllFlagCombinations::List, DefineConfigByFlags> AllConfigs;
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/** filter those configurations which actually define a wiring strategy */
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typedef Filter<AllConfigs::List, Instantiation<Strategy>::Test> PossibleConfigs;
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// internal details: setting up a factory for each required configuration
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/**
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* Fabricating a WiringDescriptor
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* tailored for a specific node wiring situation.
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*/
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template<class CONF>
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class WiringDescriptorFactory
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{
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AllocationCluster& alloc_;
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/* ==== pick actual wiring code ==== */
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typedef typename SelectBuffProvider<CONF>::Type BuffProvider;
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typedef ActualInvocationProcess<Strategy<CONF>, BuffProvider> InvocationStateType;
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// the concrete implementation of the glue code...
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typedef NodeWiring<InvocationStateType> ActualWiring;
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public:
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WiringDescriptorFactory(AllocationCluster& a)
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: alloc_(a) {}
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WiringDescriptor&
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operator() (WiringSituation const& intendedWiring)
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{
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return alloc_.create<ActualWiring> (intendedWiring);
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}
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};
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/** invocation signature of the factories */
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typedef WiringDescriptor& (FunctionType)(WiringSituation const&);
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/** preconfigured table of all possible factories */
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typedef ConfigSelector< WiringDescriptorFactory ///< Factory template to instantiate
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, FunctionType ///< function signature of the Factories
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, AllocationCluster& ///< allocator fed to all factories
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> WiringSelector;
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struct WiringFactoryImpl
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{
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WiringSelector selector;
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WiringFactoryImpl (AllocationCluster& alloc)
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: selector(config::PossibleConfigs::List(), alloc)
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{ }
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};
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} // (END) internals (namespace config)
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/** As the WiringFactory (and all the embedded factories
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* for the specific wiring situations) use the AllocationCluster
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* of the current build process, we need to create a new instance
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* for each newly built segment of the low-level model.
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* @note This ctor creates a WiringFactoryImpl instance, thus
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* compiling this definition actually drives the necessary
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* template instantiations for all cases encountered while
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* building the node network.
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*/
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WiringFactory::WiringFactory (lib::AllocationCluster& a)
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: alloc_(a),
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pImpl_(new config::WiringFactoryImpl (alloc_))
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{ }
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WiringFactory::~WiringFactory () {}
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/** create and configure a concrete wiring descriptor to tie
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* a ProcNode to its predecessor nodes. This includes selecting
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* the actual StateAdapter type, configuring it based on operation
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* control templates (policy classes).
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* The created WiringDescriptor object is bulk allocated similar to the ProcNode
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* objects for a given segment of the Timeline. It should be further configured
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* with the actual predecessor nodes pointers and can then be used to create
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* the new processing node to be wired up.
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*/
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WiringDescriptor&
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WiringFactory::operator() (WiringSituation const& setup)
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{
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long config = setup.getFlags();
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return pImpl_->selector[config] (setup);
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}
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}} // namespace proc::engine
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