/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.rdf.changesets;
import java.util.concurrent.CopyOnWriteArraySet;
import org.apache.log4j.Logger;
/**
* This delegating change log allows change events to be propagated to multiple
* delegates through a listener pattern.
*
* @author mike
*/
public class DelegatingChangeLog implements IChangeLog {
private static transient final Logger log = Logger
.getLogger(DelegatingChangeLog.class);
private final CopyOnWriteArraySet<IChangeLog> delegates;
public DelegatingChangeLog() {
this.delegates = new CopyOnWriteArraySet<IChangeLog>();
}
@Override
public String toString() {
return getClass().getName() + "{delegates=" + delegates.toString() + "}";
}
public void addDelegate(final IChangeLog delegate) {
this.delegates.add(delegate);
}
public void removeDelegate(final IChangeLog delegate) {
this.delegates.remove(delegate);
}
@Override
public void changeEvent(final IChangeRecord record) {
if (log.isInfoEnabled())
log.info(record);
for (IChangeLog delegate : delegates) {
delegate.changeEvent(record);
}
}
@Override
public void transactionBegin() {
if (log.isInfoEnabled())
log.info("");
for (IChangeLog delegate : delegates) {
delegate.transactionBegin();
}
}
@Override
public void transactionPrepare() {
if (log.isInfoEnabled())
log.info("");
for (IChangeLog delegate : delegates) {
delegate.transactionPrepare();
}
}
@Override
public void transactionCommited(final long commitTime) {
if (log.isInfoEnabled())
log.info("transaction committed");
for (IChangeLog delegate : delegates) {
delegate.transactionCommited(commitTime);
}
}
@Override
public void transactionAborted() {
if (log.isInfoEnabled())
log.info("transaction aborted");
for (IChangeLog delegate : delegates) {
delegate.transactionAborted();
}
}
@Override
public void close() {
if (log.isInfoEnabled())
log.info("close");
for (IChangeLog delegate : delegates) {
delegate.close();
}
}
}