registry.hh

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#ifndef DUNE_FEM_QUADRATURE_CACHING_REGISTRY_HH
#define DUNE_FEM_QUADRATURE_CACHING_REGISTRY_HH
 
// system includes
#include <cstddef>
#include <algorithm>
#include <list>
 
// dune-geometry includes
#include <dune/geometry/type.hh>
 
// dune-fem includes
#include <dune/fem/storage/singleton.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    // QuadratureStorageRegistry
    // -------------------------
 
    class QuadratureStorageRegistry
    {
      typedef QuadratureStorageRegistry ThisType;
 
    public:
      struct StorageInterface
      {
        virtual ~StorageInterface () {}
        virtual void cacheQuadrature ( std::size_t id, std::size_t codim, std::size_t quadSize ) = 0;
        virtual GeometryType type () const = 0;
      };
 
    // private:
      typedef std::list< StorageInterface * > StorageListType;
 
      struct QuadratureInfo
      {
        std::size_t id;
        std::size_t codim;
        std::size_t size;
        GeometryType type;
      };
 
      typedef std::list< QuadratureInfo > QuadratureInfoListType;
 
      static StorageListType &storageList ()
      {
        return Singleton< StorageListType > :: instance();
      }
 
      static QuadratureInfoListType &quadratureInfoList ()
      {
        return Singleton< QuadratureInfoListType > :: instance();
      }
 
    private:
      static inline void assertSingleThreadMode ( const bool );
 
    public:
      static void initialize ()
      {
        storageList();
        quadratureInfoList();
      }
 
      static void registerStorage ( StorageInterface &storage )
      {
        assertSingleThreadMode( false );
 
        storageList().push_back( &storage );
 
        const GeometryType type = storage.type();
        for( QuadratureInfoListType::iterator it = quadratureInfoList().begin(); it != quadratureInfoList().end(); ++it )
        {
          // only cache shape functions for quadratures with same geometry type
          if( type == it->type )
            storage.cacheQuadrature( it->id, it->codim, it->size );
        }
      }
 
      static void unregisterStorage ( StorageInterface &storage )
      {
        assertSingleThreadMode( false );
 
        const StorageListType::iterator pos
          = std::find( storageList().begin(), storageList().end(), &storage );
        if( pos != storageList().end() )
          storageList().erase( pos );
      }
 
      template< class Quadrature >
      static void registerQuadrature ( const Quadrature &quadrature )
      {
        registerQuadrature( quadrature, quadrature.geometryType(), Quadrature::codimension );
      }
 
      template< class Quadrature >
      static void registerQuadrature ( const Quadrature &quadrature,
                                       const GeometryType &type, std::size_t codim )
      {
        assertSingleThreadMode( true );
 
        QuadratureInfo quadInfo = { quadrature.id(), codim, std::size_t( quadrature.nop() ), type };
        quadratureInfoList().push_back( quadInfo );
 
        for( typename StorageListType::iterator it = storageList().begin(); it != storageList().end(); ++it )
        {
          // only cache shape functions for quadratures with same geometry type
          if( (*it)->type() == type )
            (*it)->cacheQuadrature( quadInfo.id, quadInfo.codim, quadInfo.size );
        }
      }
    };
 
  } // namespace Fem
 
} // namespace Dune
 
#include <dune/fem/misc/mpimanager.hh>
 
namespace Dune
{
  namespace Fem
  {
    inline void QuadratureStorageRegistry::assertSingleThreadMode(const bool quad)
    {
      // make sure we work in single thread mode
      // when quadratures are registered
      if( ! MPIManager::singleThreadMode() )
      {
        const char* text = quad ? "registerQuadrature" : "registerStorage";
        DUNE_THROW(SingleThreadModeError,"QuadratureStorageRegistry" << text << ": only call in single thread mode!");
      }
    }
  }
}
#endif // #ifndef DUNE_FEM_QUADRATURE_CACHING_REGISTRY_HH