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.graph.connector.inmemory;
025
026 import java.util.concurrent.TimeUnit;
027 import java.util.concurrent.locks.Lock;
028 import javax.transaction.xa.XAResource;
029 import org.jboss.dna.common.statistic.Stopwatch;
030 import org.jboss.dna.common.util.Logger;
031 import org.jboss.dna.graph.ExecutionContext;
032 import org.jboss.dna.graph.cache.CachePolicy;
033 import org.jboss.dna.graph.connector.RepositoryConnection;
034 import org.jboss.dna.graph.connector.RepositorySourceException;
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 public class InMemoryRepositoryConnection implements RepositoryConnection {
042
043 private final InMemoryRepositorySource source;
044 private final InMemoryRepository repository;
045
046 InMemoryRepositoryConnection( InMemoryRepositorySource source,
047 InMemoryRepository repository ) {
048 assert source != null;
049 assert repository != null;
050 this.source = source;
051 this.repository = repository;
052 }
053
054 /**
055 * {@inheritDoc}
056 */
057 public String getSourceName() {
058 return source.getName();
059 }
060
061 /**
062 * {@inheritDoc}
063 */
064 public CachePolicy getDefaultCachePolicy() {
065 return source.getDefaultCachePolicy();
066 }
067
068 /**
069 * {@inheritDoc}
070 */
071 public XAResource getXAResource() {
072 return null;
073 }
074
075 /**
076 * {@inheritDoc}
077 */
078 public boolean ping( long time,
079 TimeUnit unit ) {
080 return true;
081 }
082
083 /**
084 * {@inheritDoc}
085 */
086 public void close() {
087 // do nothing
088 }
089
090 /**
091 * {@inheritDoc}
092 *
093 * @see org.jboss.dna.graph.connector.RepositoryConnection#execute(org.jboss.dna.graph.ExecutionContext,
094 * org.jboss.dna.graph.request.Request)
095 */
096 public void execute( ExecutionContext context,
097 Request request ) throws RepositorySourceException {
098 Logger logger = context.getLogger(getClass());
099 Stopwatch sw = null;
100 if (logger.isTraceEnabled()) {
101 sw = new Stopwatch();
102 sw.start();
103 }
104 // Do any commands update/write?
105 RequestProcessor processor = new InMemoryRequestProcessor(context, this.repository, this.source.getRepositoryContext());
106
107 Lock lock = request.isReadOnly() ? repository.getLock().readLock() : repository.getLock().writeLock();
108 lock.lock();
109 try {
110 // Obtain the lock and execute the commands ...
111 processor.process(request);
112 } finally {
113 try {
114 processor.close();
115 } finally {
116 lock.unlock();
117 }
118 }
119 if (logger.isTraceEnabled()) {
120 assert sw != null;
121 sw.stop();
122 logger.trace("InMemoryRepositoryConnection.execute(...) took " + sw.getTotalDuration());
123 }
124 }
125
126 /**
127 * {@inheritDoc}
128 *
129 * @see java.lang.Object#toString()
130 */
131 @Override
132 public String toString() {
133 return "Connection to the \"" + getSourceName() + "\" in-memory repository";
134 }
135 }