/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.core.data;
import org.apache.jackrabbit.api.management.DataStoreGarbageCollector;
import org.apache.jackrabbit.api.management.MarkEventListener;
import org.apache.jackrabbit.core.SessionImpl;
import org.apache.jackrabbit.core.gc.GarbageCollector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Iterator;
import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
/**
* Helper class that runs data store garbage collection as a background thread.
*/
public class GCThread implements Runnable, MarkEventListener {
/** logger instance */
private static final Logger LOG = LoggerFactory.getLogger(GCThread.class);
private boolean stop;
private Session session;
private Exception exception;
public GCThread(Session session) {
this.session = session;
}
public void run() {
try {
GarbageCollector gc = ((SessionImpl) session)
.createDataStoreGarbageCollector();
gc.setMarkEventListener(this);
while (!stop) {
LOG.debug("Scanning...");
gc.mark();
int count = listIdentifiers(gc);
LOG.debug("Stop; currently " + count + " identifiers");
gc.stopScan();
int numDeleted = gc.sweep();
if (numDeleted > 0) {
LOG.debug("Deleted " + numDeleted + " identifiers");
}
LOG.debug("Waiting...");
Thread.sleep(10);
}
gc.close();
} catch (Exception ex) {
LOG.error("Error scanning", ex);
exception = ex;
}
}
public void setStop(boolean stop) {
this.stop = stop;
}
public Exception getException() {
return exception;
}
private int listIdentifiers(DataStoreGarbageCollector gc) throws DataStoreException {
DataStore ds = ((GarbageCollector) gc).getDataStore();
Iterator<DataIdentifier> it = ds.getAllIdentifiers();
int count = 0;
while (it.hasNext()) {
DataIdentifier id = it.next();
LOG.debug(" " + id);
count++;
}
return count;
}
public void throwException() throws Exception {
if (exception != null) {
throw exception;
}
}
public void beforeScanning(Node n) throws RepositoryException {
// nothing to do
}
}