/*
* ModeShape (http://www.modeshape.org)
*
* Licensed 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.modeshape.jcr.index.local;
import org.mapdb.Atomic;
import org.mapdb.DB;
import org.modeshape.common.annotation.Immutable;
import org.modeshape.common.annotation.ThreadSafe;
/**
* Class which handles various aspects related to local index updating in terms of writing data to MapDB.
*
* @author Horia Chiorean (hchiorea@redhat.com)
*/
@Immutable
@ThreadSafe
public final class IndexUpdater {
private static final String LAST_SUCCESSFUL_UPDATE = "$lastSuccessfulUpdateAt";
private final DB db;
protected IndexUpdater( DB db ) {
this.db = db;
}
protected void commit() {
writeLatestUpdateTime(System.currentTimeMillis());
db.commit();
}
protected Long latestIndexUpdateTime() {
// note that if the field doest not exist, this will return 0
return db.getAtomicLong(LAST_SUCCESSFUL_UPDATE).get();
}
private void writeLatestUpdateTime( long updateTime ) {
Atomic.Long atomicLong = db.getAtomicLong(LAST_SUCCESSFUL_UPDATE);
long latestValue = atomicLong.get();
if (latestValue < updateTime) {
atomicLong.compareAndSet(latestValue, updateTime);
}
}
}