001 /*
002 * JBoss DNA (http://www.jboss.org/dna)
003 * See the COPYRIGHT.txt file distributed with this work for information
004 * regarding copyright ownership. Some portions may be licensed
005 * to Red Hat, Inc. under one or more contributor license agreements.
006 * See the AUTHORS.txt file in the distribution for a full listing of
007 * individual contributors.
008 *
009 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
010 * is licensed to you under the terms of the GNU Lesser General Public License as
011 * published by the Free Software Foundation; either version 2.1 of
012 * the License, or (at your option) any later version.
013 *
014 * JBoss DNA is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017 * Lesser General Public License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this software; if not, write to the Free
021 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
022 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
023 */
024 package org.jboss.dna.connector.federation;
025
026 import java.util.concurrent.TimeUnit;
027 import java.util.concurrent.atomic.AtomicReference;
028 import javax.transaction.xa.XAResource;
029 import net.jcip.annotations.ThreadSafe;
030 import org.jboss.dna.graph.ExecutionContext;
031 import org.jboss.dna.graph.cache.CachePolicy;
032 import org.jboss.dna.graph.connector.RepositoryConnection;
033 import org.jboss.dna.graph.connector.RepositorySourceException;
034 import org.jboss.dna.graph.connector.RepositorySourceListener;
035 import org.jboss.dna.graph.request.Request;
036 import org.jboss.dna.graph.request.processor.RequestProcessor;
037
038 /**
039 * @author Randall Hauch
040 */
041 @ThreadSafe
042 public class FederatedRepositoryConnection implements RepositoryConnection {
043
044 protected static final RepositorySourceListener NO_OP_LISTENER = new RepositorySourceListener() {
045 public void notify( String sourceName,
046 Object... events ) {
047 // do nothing
048 }
049 };
050
051 private final FederatedRepository repository;
052 private final String sourceName;
053 private final AtomicReference<RepositorySourceListener> listener;
054
055 protected FederatedRepositoryConnection( FederatedRepository repository,
056 String sourceName ) {
057 assert sourceName != null;
058 assert repository != null;
059 this.sourceName = sourceName;
060 this.repository = repository;
061 this.listener = new AtomicReference<RepositorySourceListener>(NO_OP_LISTENER);
062 this.repository.register(this);
063 }
064
065 /**
066 * @return repository
067 */
068 protected FederatedRepository getRepository() {
069 return this.repository;
070 }
071
072 /**
073 * {@inheritDoc}
074 */
075 public String getSourceName() {
076 return this.sourceName;
077 }
078
079 /**
080 * {@inheritDoc}
081 */
082 public CachePolicy getDefaultCachePolicy() {
083 return null;
084 }
085
086 /**
087 * {@inheritDoc}
088 */
089 public XAResource getXAResource() {
090 return null;
091 }
092
093 /**
094 * {@inheritDoc}
095 */
096 public void setListener( RepositorySourceListener listener ) {
097 if (listener == null) listener = NO_OP_LISTENER;
098 RepositorySourceListener oldListener = this.listener.getAndSet(listener);
099 this.repository.addListener(listener);
100 if (oldListener != NO_OP_LISTENER) {
101 this.repository.removeListener(oldListener);
102 }
103 }
104
105 /**
106 * {@inheritDoc}
107 */
108 public boolean ping( long time,
109 TimeUnit unit ) {
110 return this.repository.isRunning();
111 }
112
113 /**
114 * {@inheritDoc}
115 *
116 * @see org.jboss.dna.graph.connector.RepositoryConnection#execute(org.jboss.dna.graph.ExecutionContext,
117 * org.jboss.dna.graph.request.Request)
118 */
119 public void execute( ExecutionContext context,
120 Request request ) throws RepositorySourceException {
121 if (!this.repository.isRunning()) {
122 throw new RepositorySourceException(FederationI18n.repositoryHasBeenShutDown.text(this.repository.getName()));
123 }
124 if (request == null) return;
125
126 RequestProcessor processor = this.repository.getProcessor(context, sourceName);
127 assert processor != null;
128 try {
129 processor.process(request);
130 } finally {
131 processor.close();
132 }
133 }
134
135 /**
136 * {@inheritDoc}
137 */
138 public void close() {
139 try {
140 this.repository.removeListener(this.listener.get());
141 } finally {
142 this.repository.unregister(this);
143 }
144 }
145
146 }