| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| * |
| */ |
| |
| package org.apache.polygene.index.rdf.indexing; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import org.apache.polygene.api.activation.ActivatorAdapter; |
| import org.apache.polygene.api.activation.Activators; |
| import org.apache.polygene.api.entity.EntityDescriptor; |
| import org.apache.polygene.api.entity.EntityReference; |
| import org.apache.polygene.api.injection.scope.Service; |
| import org.apache.polygene.api.injection.scope.Uses; |
| import org.apache.polygene.api.mixin.Mixins; |
| import org.apache.polygene.api.service.ServiceReference; |
| import org.apache.polygene.api.util.Classes; |
| import org.apache.polygene.library.rdf.entity.EntityStateSerializer; |
| import org.apache.polygene.library.rdf.entity.EntityTypeSerializer; |
| import org.apache.polygene.spi.entity.EntityState; |
| import org.apache.polygene.spi.entity.EntityStatus; |
| import org.apache.polygene.spi.entitystore.StateChangeListener; |
| import org.openrdf.model.Graph; |
| import org.openrdf.model.Resource; |
| import org.openrdf.model.Statement; |
| import org.openrdf.model.URI; |
| import org.openrdf.model.ValueFactory; |
| import org.openrdf.model.impl.GraphImpl; |
| import org.openrdf.repository.Repository; |
| import org.openrdf.repository.RepositoryConnection; |
| import org.openrdf.repository.RepositoryException; |
| |
| @Mixins( RdfIndexerService.RdfEntityIndexerMixin.class ) |
| @Activators( RdfIndexerService.Activator.class ) |
| public interface RdfIndexerService extends StateChangeListener |
| { |
| void initialize(); |
| |
| File dataDir(); |
| |
| class Activator extends ActivatorAdapter<ServiceReference<RdfIndexerService>> |
| { |
| |
| @Override |
| public void afterActivation( ServiceReference<RdfIndexerService> activated ) |
| throws Exception |
| { |
| activated.get().initialize(); |
| } |
| } |
| |
| /** |
| * JAVADOC Add JavaDoc |
| */ |
| abstract class RdfEntityIndexerMixin |
| implements RdfIndexerService |
| { |
| @Service |
| private ServiceReference<Repository> repository; |
| |
| @Uses |
| private EntityStateSerializer stateSerializer; |
| |
| @Uses |
| private EntityTypeSerializer typeSerializer; |
| |
| private Set<EntityDescriptor> indexedEntityTypes; |
| private ValueFactory valueFactory; |
| |
| @Override |
| public void initialize() |
| { |
| indexedEntityTypes = new HashSet<>(); |
| } |
| |
| @Override |
| public void notifyChanges( Iterable<EntityState> entityStates ) |
| { |
| try |
| { |
| if( repository == null || !repository.isActive() ) // has been shut down, or not yet started... |
| { |
| return; |
| } |
| final RepositoryConnection connection = repository.get().getConnection(); |
| // The Repository is being initialized and not ready yet. |
| // This happens when the Repository is being initialized and it is accessing its own configuration. |
| if( connection == null ) |
| { |
| return; |
| } |
| connection.setAutoCommit( false ); |
| try |
| { |
| removeEntityStates( entityStates, connection ); |
| connection.commit(); |
| final Set<EntityDescriptor> entityTypes = indexUpdates( entityStates, connection ); |
| indexNewTypes( connection, entityTypes ); |
| } |
| finally |
| { |
| connection.commit(); |
| connection.close(); |
| } |
| } |
| catch( Throwable e ) |
| { |
| e.printStackTrace(); |
| //TODO What shall we do with the exception? Probably figure out if we can recover, and possibly queue the state changes and retry later. |
| } |
| } |
| |
| private void indexNewTypes( RepositoryConnection connection, Set<EntityDescriptor> entityTypes ) |
| throws RepositoryException |
| { |
| // Index new types |
| for( EntityDescriptor entityType : entityTypes ) |
| { |
| if( !indexedEntityTypes.contains( entityType ) ) |
| { |
| indexEntityType( entityType, connection ); |
| indexedEntityTypes.add( entityType ); |
| } |
| } |
| } |
| |
| private Set<EntityDescriptor> indexUpdates( Iterable<EntityState> entityStates, |
| RepositoryConnection connection |
| ) |
| throws RepositoryException |
| { |
| // Figure out what to update |
| final Set<EntityDescriptor> entityTypes = new HashSet<>(); |
| for( EntityState entityState : entityStates ) |
| { |
| if( entityState.status().equals( EntityStatus.UPDATED ) ) |
| { |
| indexEntityState( entityState, connection ); |
| entityTypes.add( entityState.entityDescriptor() ); |
| } |
| else if( entityState.status().equals( EntityStatus.NEW ) ) |
| { |
| indexEntityState( entityState, connection ); |
| entityTypes.add( entityState.entityDescriptor() ); |
| } |
| } |
| return entityTypes; |
| } |
| |
| private void removeEntityStates( Iterable<EntityState> entityStates, RepositoryConnection connection ) |
| throws RepositoryException |
| { |
| List<URI> removedStates = new ArrayList<>(); |
| for( EntityState entityState : entityStates ) |
| { |
| if( entityState.status().equals( EntityStatus.REMOVED ) ) |
| { |
| removedStates.add( stateSerializer.createEntityURI( getValueFactory(), entityState.entityReference() ) ); |
| } |
| else if( entityState.status().equals( EntityStatus.UPDATED ) ) |
| { |
| removedStates.add( stateSerializer.createEntityURI( getValueFactory(), entityState.entityReference() ) ); |
| } |
| } |
| |
| if( !removedStates.isEmpty() ) |
| { |
| Resource[] resources = removedStates.toArray( new Resource[ removedStates.size() ] ); |
| connection.remove( null, null, null, resources ); |
| } |
| } |
| |
| private void indexEntityState( final EntityState entityState, |
| final RepositoryConnection connection |
| ) |
| throws RepositoryException |
| { |
| if( entityState.entityDescriptor().queryable() ) |
| { |
| EntityReference reference = entityState.entityReference(); |
| final URI entityURI = stateSerializer.createEntityURI( getValueFactory(), reference); |
| Graph graph = new GraphImpl(); |
| stateSerializer.serialize( entityState, false, graph ); |
| connection.add( graph, entityURI ); |
| } |
| } |
| |
| private void indexEntityType( final EntityDescriptor entityType, |
| final RepositoryConnection connection |
| ) |
| throws RepositoryException |
| { |
| if( entityType.queryable() ) |
| { |
| String uri = Classes.toURI(entityType.types().findFirst().orElse(null)); |
| final URI compositeURI = getValueFactory().createURI( uri ); |
| // remove composite type if already present |
| connection.clear( compositeURI ); |
| |
| Iterable<Statement> statements = typeSerializer.serialize( entityType ); |
| connection.add( statements, compositeURI ); |
| } |
| } |
| |
| private ValueFactory getValueFactory() |
| { |
| if( valueFactory == null ) |
| { |
| valueFactory = repository.get().getValueFactory(); |
| } |
| return valueFactory; |
| } |
| |
| @Override |
| public File dataDir() |
| { |
| return repository.get().getDataDir(); |
| } |
| } |
| } |