/*
* JBoss DNA (http://www.jboss.org/dna)
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
* See the AUTHORS.txt file in the distribution for a full listing of
* individual contributors.
*
* JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
* is licensed to you under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* JBoss DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.dna.graph.connector.map;
import java.util.concurrent.TimeUnit;
import javax.transaction.xa.XAResource;
import org.jboss.dna.common.statistic.Stopwatch;
import org.jboss.dna.common.util.Logger;
import org.jboss.dna.graph.ExecutionContext;
import org.jboss.dna.graph.cache.CachePolicy;
import org.jboss.dna.graph.connector.RepositoryConnection;
import org.jboss.dna.graph.connector.RepositoryContext;
import org.jboss.dna.graph.connector.RepositorySourceException;
import org.jboss.dna.graph.observe.Observer;
import org.jboss.dna.graph.request.Request;
import org.jboss.dna.graph.request.processor.RequestProcessor;
/**
* A connection to a {@link MapRepository}.
*/
public class MapRepositoryConnection implements RepositoryConnection {
private final MapRepositorySource source;
private final MapRepository repository;
public MapRepositoryConnection( MapRepositorySource source,
MapRepository repository ) {
assert source != null;
assert repository != null;
this.source = source;
this.repository = repository;
}
/**
* {@inheritDoc}
*/
public String getSourceName() {
return source.getName();
}
/**
* {@inheritDoc}
*/
public CachePolicy getDefaultCachePolicy() {
return source.getDefaultCachePolicy();
}
/**
* {@inheritDoc}
*/
public XAResource getXAResource() {
return null;
}
/**
* {@inheritDoc}
*/
public boolean ping( long time,
TimeUnit unit ) {
return true;
}
/**
* {@inheritDoc}
*/
public void close() {
// do nothing
}
/**
* {@inheritDoc}
*
* @see org.jboss.dna.graph.connector.RepositoryConnection#execute(org.jboss.dna.graph.ExecutionContext,
* org.jboss.dna.graph.request.Request)
*/
public void execute( ExecutionContext context,
Request request ) throws RepositorySourceException {
Logger logger = context.getLogger(getClass());
Stopwatch sw = null;
if (logger.isTraceEnabled()) {
sw = new Stopwatch();
sw.start();
}
// Do any commands update/write?
RepositoryContext repositoryContext = this.source.getRepositoryContext();
Observer observer = repositoryContext != null ? repositoryContext.getObserver() : null;
RequestProcessor processor = new MapRequestProcessor(context, this.repository, observer, source.areUpdatesAllowed());
boolean commit = true;
MapRepositoryTransaction txn = repository.startTransaction(request.isReadOnly());
try {
// Obtain the lock and execute the commands ...
processor.process(request);
if (request.hasError() && !request.isReadOnly()) {
// The changes failed, so we need to rollback so we have 'all-or-nothing' behavior
commit = false;
}
} catch (Throwable error) {
commit = false;
} finally {
try {
processor.close();
} finally {
// Now commit or rollback ...
try {
if (commit) {
txn.commit();
} else {
// Need to rollback the changes made to the repository ...
txn.rollback();
}
} catch (Throwable commitOrRollbackError) {
if (commit && !request.hasError() && !request.isFrozen()) {
// Record the error on the request ...
request.setError(commitOrRollbackError);
}
commit = false; // couldn't do it
}
if (commit) {
// Now that we've closed our transaction, we can notify the observer of the committed changes ...
processor.notifyObserverOfChanges();
}
}
}
if (logger.isTraceEnabled()) {
assert sw != null;
sw.stop();
logger.trace("MapRepositoryConnection.execute(...) took " + sw.getTotalDuration());
}
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "Connection to the \"" + getSourceName() + "\" " + repository.getClass().getSimpleName();
}
}