/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.checker;
import org.apache.log4j.Logger;
import org.dspace.checker.factory.CheckerServiceFactory;
import org.dspace.checker.service.ChecksumHistoryService;
import org.dspace.content.Bitstream;
import org.dspace.content.factory.ContentServiceFactory;
import org.dspace.content.service.BitstreamService;
import org.dspace.core.Context;
import org.dspace.event.Consumer;
import org.dspace.event.Event;
/**
* Class for removing Checker data for a Bitstreams based on deletion events.
*
* @version $Revision$
*/
public class CheckerConsumer implements Consumer
{
/** log4j logger */
private static Logger log = Logger.getLogger(CheckerConsumer.class);
protected ChecksumHistoryService checksumHistoryService = CheckerServiceFactory.getInstance().getChecksumHistoryService();
protected BitstreamService bitstreamService = ContentServiceFactory.getInstance().getBitstreamService();
/**
* Initialize - allocate any resources required to operate.
* Called at the start of ANY sequence of event consume() calls.
* @throws Exception if error
*/
@Override
public void initialize() throws Exception
{
// no-op
}
/**
* Consume an event
*
* @param ctx the execution context object
*
* @param event the content event
* @throws Exception if error
*/
@Override
public void consume(Context ctx, Event event) throws Exception
{
if (event.getEventType() == Event.DELETE)
{
Bitstream bitstream = bitstreamService.find(ctx, event.getSubjectID());
log.debug("Attempting to remove Checker Info");
checksumHistoryService.deleteByBitstream(ctx, bitstream);
log.debug("Completed removing Checker Info");
}
}
/**
* Signal that there are no more events queued in this
* event stream.
* @param ctx Context
* @throws Exception if error
*/
@Override
public void end(Context ctx) throws Exception
{
// no-op
}
/**
* Finish - free any allocated resources.
* Called when consumer is being released
* @param ctx Context
* @throws Exception if error
*/
@Override
public void finish(Context ctx) throws Exception
{
// no-op
}
}