Java tutorial
/** * Copyright 2015 DuraSpace, Inc. * * Licensed 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.fcrepo.kernel.modeshape.rdf.impl; import static com.google.common.collect.ImmutableSet.builder; import static com.hp.hpl.jena.graph.NodeFactory.createLiteral; import static com.hp.hpl.jena.graph.NodeFactory.createURI; import static com.hp.hpl.jena.graph.Triple.create; import static com.hp.hpl.jena.rdf.model.ResourceFactory.createTypedLiteral; import static java.util.Arrays.stream; import static java.util.stream.Collectors.joining; import static org.fcrepo.kernel.api.FedoraJcrTypes.ROOT; import static org.fcrepo.kernel.api.RdfLexicon.HAS_FIXITY_CHECK_COUNT; import static org.fcrepo.kernel.api.RdfLexicon.HAS_FIXITY_ERROR_COUNT; import static org.fcrepo.kernel.api.RdfLexicon.HAS_FIXITY_REPAIRED_COUNT; import static org.fcrepo.kernel.api.RdfLexicon.REPOSITORY_NAMESPACE; import static org.slf4j.LoggerFactory.getLogger; import com.hp.hpl.jena.rdf.model.Resource; import org.apache.commons.lang3.StringUtils; import org.fcrepo.kernel.api.identifiers.IdentifierConverter; import org.fcrepo.kernel.api.models.FedoraResource; import org.fcrepo.metrics.RegistryService; import java.util.Map; import javax.jcr.Repository; import org.fcrepo.kernel.modeshape.services.functions.GetClusterConfiguration; import org.modeshape.jcr.JcrRepository; import org.slf4j.Logger; import com.codahale.metrics.Counter; import com.google.common.collect.ImmutableSet; import com.hp.hpl.jena.graph.Triple; /** * Assemble {@link Triple}s derived from the root of a repository. * * @author ajs6f * @since Oct 18, 2013 */ public class RootRdfContext extends NodeRdfContext { private static final String PREFIX = "org.fcrepo.services."; private static final String FIXITY_REPAIRED_COUNTER = "LowLevelStorageService.fixity-repaired-counter"; private static final String FIXITY_ERROR_COUNTER = "LowLevelStorageService.fixity-error-counter"; private static final String FIXITY_CHECK_COUNTER = "LowLevelStorageService.fixity-check-counter"; private static final Logger LOGGER = getLogger(RootRdfContext.class); static final RegistryService registryService = RegistryService.getInstance(); /** * Ordinary constructor. * * @param resource the resource * @param idTranslator the id translator */ public RootRdfContext(final FedoraResource resource, final IdentifierConverter<Resource, FedoraResource> idTranslator) { super(resource, idTranslator); if (resource().hasType(ROOT)) { concatRepositoryTriples(); } } private void concatRepositoryTriples() { LOGGER.trace("Creating RDF triples for repository description"); final Repository repository = session().getRepository(); final ImmutableSet.Builder<Triple> b = builder(); stream(repository.getDescriptorKeys()).forEach(key -> { final String descriptor = repository.getDescriptor(key); if (descriptor != null) { // Create a URI from the jcr.Repository constant values, // converting them from dot notation (identifier.stability) // to the camel case that is more common in RDF properties. final String uri = stream(key.split("\\.")).map(StringUtils::capitalize) .collect(joining("", REPOSITORY_NAMESPACE + "repository", "")); b.add(create(subject(), createURI(uri), createLiteral(descriptor))); } }); /* FIXME: removing due to performance problems, esp. w/ many files on federated filesystem see: https://www.pivotaltracker.com/story/show/78647248 b.add(create(subject(), HAS_OBJECT_COUNT.asNode(), createLiteral(String .valueOf(getRepositoryCount(repository))))); b.add(create(subject(), HAS_OBJECT_SIZE.asNode(), createLiteral(String .valueOf(getRepositorySize(repository))))); */ // Get the cluster configuration, if available // this ugly test checks to see whether this is an ordinary JCR // repository or a ModeShape repo, which will possess the extra info if (JcrRepository.class.isAssignableFrom(repository.getClass())) { final Map<String, String> config = new GetClusterConfiguration().apply(repository); assert (config != null); config.forEach( (k, v) -> b.add(create(subject(), createURI(REPOSITORY_NAMESPACE + k), createLiteral(v)))); } // retrieve the metrics from the service final Map<String, Counter> counters = registryService.getMetrics().getCounters(); // and add the repository metrics to the RDF model if (counters.containsKey(FIXITY_CHECK_COUNTER)) { b.add(create(subject(), HAS_FIXITY_CHECK_COUNT.asNode(), createTypedLiteral(counters.get(PREFIX + FIXITY_CHECK_COUNTER).getCount()).asNode())); } if (counters.containsKey(FIXITY_ERROR_COUNTER)) { b.add(create(subject(), HAS_FIXITY_ERROR_COUNT.asNode(), createTypedLiteral(counters.get(PREFIX + FIXITY_ERROR_COUNTER).getCount()).asNode())); } if (counters.containsKey(FIXITY_REPAIRED_COUNTER)) { b.add(create(subject(), HAS_FIXITY_REPAIRED_COUNT.asNode(), createTypedLiteral(counters.get(PREFIX + FIXITY_REPAIRED_COUNTER).getCount()).asNode())); } // offer all these accumulated triples concat(b.build()); } }