package org.jboss.dna.graph.connector.path;
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.RepositorySourceException;
import org.jboss.dna.graph.request.Request;
public class PathRepositoryConnection implements RepositoryConnection {
private final PathRepositorySource source;
private final PathRepository repository;
public PathRepositoryConnection( PathRepositorySource source,
PathRepository 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.getCachePolicy();
}
/**
* {@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?
PathRequestProcessor processor = repository.createRequestProcessor(context, source);
PathRepositoryTransaction txn = processor.getTransaction();
boolean commit = true;
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(getClass().getSimpleName() + ".execute(...) took " + sw.getTotalDuration());
}
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "Connection to the \"" + getSourceName() + "\" " + repository.getClass().getSimpleName();
}
}