001/* 002 * (C) Copyright 2011 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Florent Guillaume 018 */ 019package org.nuxeo.ecm.platform.relations.jena; 020 021import org.apache.commons.logging.Log; 022import org.apache.commons.logging.LogFactory; 023import org.nuxeo.ecm.core.api.CoreSession; 024import org.nuxeo.ecm.platform.relations.CoreGraphFactory; 025import org.nuxeo.ecm.platform.relations.api.Graph; 026import org.nuxeo.ecm.platform.relations.api.GraphDescription; 027import org.nuxeo.ecm.platform.relations.api.GraphFactory; 028import org.nuxeo.ecm.platform.relations.services.RelationService; 029import org.nuxeo.runtime.api.Framework; 030 031/** 032 * A factory that detects if a Jena graph or a core graph should be used, and remembers it for future invocations. 033 * <p> 034 * A Jena graph is used if it contains at least one relation for the given graph. 035 */ 036public class JenaOrCoreGraphFactory implements GraphFactory { 037 038 private static final Log log = LogFactory.getLog(JenaOrCoreGraphFactory.class); 039 040 // used for tests 041 protected static JenaGraph testJenaGraph; 042 043 @Override 044 public Graph createGraph(GraphDescription graphDescription, CoreSession session) { 045 RelationService service = (RelationService) Framework.getRuntime().getComponent(RelationService.NAME); 046 String name = graphDescription.getName(); 047 048 Graph graph; 049 if (testJenaGraph == null) { 050 graph = new JenaGraph(); 051 } else { 052 // test mode, allows reuse of in-memory graph 053 graph = testJenaGraph; 054 } 055 graph.setDescription(graphDescription); 056 if (graph.size().longValue() > 0) { 057 // Jena graph already contains data, use it 058 service.graphFactories.remove(name); 059 service.graphRegistry.put(name, graph); 060 log.info("Graph " + name + " using Jena"); 061 } else { 062 // use a core graph and remember this factory 063 GraphFactory factory = new CoreGraphFactory(); 064 service.graphFactories.put(name, factory); 065 graph = factory.createGraph(graphDescription, session); 066 log.info("Graph " + name + " using Core"); 067 } 068 return graph; 069 } 070 071}