org.apache.jackrabbit.oak.plugins.document.mongo.MongoMissingLastRevSeeker Maven / Gradle / Ivy
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* 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
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*/
package org.apache.jackrabbit.oak.plugins.document.mongo;
import javax.annotation.Nonnull;
import static com.google.common.collect.Iterables.transform;
import static com.mongodb.QueryBuilder.start;
import com.google.common.base.Function;
import com.mongodb.BasicDBObject;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.QueryBuilder;
import com.mongodb.ReadPreference;
import org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfo;
import org.apache.jackrabbit.oak.plugins.document.Collection;
import org.apache.jackrabbit.oak.plugins.document.MissingLastRevSeeker;
import org.apache.jackrabbit.oak.plugins.document.NodeDocument;
import org.apache.jackrabbit.oak.plugins.document.util.CloseableIterable;
import org.apache.jackrabbit.oak.stats.Clock;
/**
* Mongo specific version of MissingLastRevSeeker which uses mongo queries
* to fetch candidates which may have missed '_lastRev' updates.
*
* Uses a time range to find documents modified during that interval.
*/
public class MongoMissingLastRevSeeker extends MissingLastRevSeeker {
private final MongoDocumentStore store;
public MongoMissingLastRevSeeker(MongoDocumentStore store, Clock clock) {
super(store, clock);
this.store = store;
}
@Override
@Nonnull
public CloseableIterable getCandidates(final long startTime) {
DBObject query =
start(NodeDocument.MODIFIED_IN_SECS).greaterThanEquals(
NodeDocument.getModifiedInSecs(startTime))
.get();
DBObject sortFields = new BasicDBObject(NodeDocument.MODIFIED_IN_SECS, -1);
DBCursor cursor =
getNodeCollection().find(query)
.sort(sortFields)
.setReadPreference(ReadPreference.primary());
return CloseableIterable.wrap(transform(cursor, new Function() {
@Override
public NodeDocument apply(DBObject input) {
return store.convertFromDBObject(Collection.NODES, input);
}
}), cursor);
}
@Override
public boolean isRecoveryNeeded() {
QueryBuilder query =
start(ClusterNodeInfo.STATE).is(ClusterNodeInfo.ClusterNodeState.ACTIVE.name())
.put(ClusterNodeInfo.LEASE_END_KEY).lessThan(clock.getTime());
return getClusterNodeCollection().findOne(query.get()) != null;
}
private DBCollection getNodeCollection() {
return store.getDBCollection(Collection.NODES);
}
private DBCollection getClusterNodeCollection() {
return store.getDBCollection(Collection.CLUSTER_NODES);
}
}