Java tutorial
package de.zib.gndms.dspace.slice.service.globus.resource; /* * Copyright 2008-2011 Zuse Institute Berlin (ZIB) * * 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. */ import de.zib.gndms.dspace.common.DSpaceTools; import de.zib.gndms.dspace.service.globus.resource.ExtDSpaceResourceHome; import de.zib.gndms.dspace.slice.stubs.types.SliceReference; import de.zib.gndms.infra.GNDMSTools; import de.zib.gndms.infra.GridConfig; import de.zib.gndms.infra.service.GNDMPersistentServiceHome; import de.zib.gndms.infra.system.GNDMSystem; import de.zib.gndms.infra.wsrf.ReloadablePersistentResource; import de.zib.gndms.model.dspace.Slice; import org.apache.axis.message.addressing.AttributedURI; import org.apache.axis.message.addressing.EndpointReferenceType; import org.apache.axis.types.URI; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.globus.wsrf.Resource; import org.globus.wsrf.ResourceException; import org.globus.wsrf.ResourceKey; import org.globus.wsrf.impl.SimpleResourceKey; import org.globus.wsrf.utils.AddressingUtils; import org.jetbrains.annotations.NotNull; import javax.naming.NamingException; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Query; import javax.xml.namespace.QName; /** * This class overrides the ResourceHome that is automatically generated by introduce for Globus * Toolkit. In GNDMS this is mainly necessary to provide RDBMS/JPA-based resource persistence. * In order to use the extended resource home they have to be configured in jndi-config.xml. * If this has been done properly, you should see an info-level log message during the start up * of the web service container that notifies succesfull initialization of the extended resource * home. * * @author try ste fan pla nti kow zib * @version $Id$ * * User: stepn Date: 16.07.2008 Time: 12:35:27 */ public final class ExtSliceResourceHome extends SliceResourceHome implements GNDMPersistentServiceHome<Slice> { // logger can be an instance field since resource home classes are instantiated at most once @NotNull @SuppressWarnings({ "FieldNameHidesFieldInSuperclass" }) private final Log logger = LogFactory.getLog(ExtSliceResourceHome.class); // System: Set during initialization @SuppressWarnings({ "FieldAccessedSynchronizedAndUnsynchronized" }) @NotNull private GNDMSystem system; // Service Address: set during initialization @SuppressWarnings({ "FieldAccessedSynchronizedAndUnsynchronized" }) private AttributedURI serviceAddress; private boolean initialized; @Override public synchronized void initialize() throws Exception { if (!initialized) { logger.info("Extended Slice home initializing"); try { try { final GridConfig gridConfig = ExtDSpaceResourceHome.getGridConfig(); logger.debug("Config: " + gridConfig.asString()); system = gridConfig.retrieveSystemReference(); serviceAddress = GNDMSTools.getServiceAddressFromContext(); initialized = true; super.initialize(); // Overridden method } catch (NamingException e) { throw new RuntimeException(e); } } catch (RuntimeException e) { initialized = false; logger.error("Initialization failed", e); e.printStackTrace(System.err); throw e; } } } private void ensureInitialized() { try { initialize(); } catch (Exception e) { logger.error("Unexpected initialization error", e); throw new RuntimeException(e); } } @SuppressWarnings({ "unchecked", "RawUseOfParameterizedType" }) @Override protected Resource createNewInstance() throws ResourceException { final Resource instance = super.createNewInstance(); ((ReloadablePersistentResource) instance).setResourceHome(this); return instance; } @NotNull public URI getServiceAddress() { ensureInitialized(); return serviceAddress; } public QName getResourceKeyTypeName() { return getKeyTypeName(); } @NotNull public EntityManagerFactory getEntityManagerFactory() { return getSystem().getEntityManagerFactory(); } @NotNull public GNDMSystem getSystem() throws IllegalStateException { ensureInitialized(); return system; } public void setSystem(@NotNull GNDMSystem systemParam) throws IllegalStateException { throw new UnsupportedOperationException("Cant overwrite system"); } @NotNull public Query getListAllQuery(final @NotNull EntityManager em) { return em.createNamedQuery("listAllSliceIds"); } public void refresh(@NotNull Slice resource) throws ResourceException { DSpaceTools.refreshModelResource(resource, this); } @NotNull public String getNickName() { return "slice"; } @NotNull public Class<Slice> getModelClass() { return Slice.class; } public ResourceKey getKeyForResourceModel(@NotNull Slice model) { return getKeyForId(model.getId()); } @NotNull public ResourceKey getKeyForId(@NotNull final String id) { return new SimpleResourceKey(getKeyTypeName(), id); } @Override public SliceReference getResourceReference(final @NotNull ResourceKey key) throws Exception { EndpointReferenceType epr = AddressingUtils.createEndpointReference(serviceAddress.toString(), key); SliceReference ref = new SliceReference(); ref.setEndpointReference(epr); return ref; } }