/*
* 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.oak.plugins.document.mongo;
import static com.google.common.collect.Iterables.transform;
import static com.mongodb.QueryBuilder.start;
import static org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfo.RecoverLockState;
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.Document;
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;
/**
* 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) {
super(store);
this.store = store;
}
@Override
public CloseableIterable<NodeDocument> 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<DBObject, NodeDocument>() {
@Override
public NodeDocument apply(DBObject input) {
return store.convertFromDBObject(Collection.NODES, input);
}
}), cursor);
}
@Override
public boolean acquireRecoveryLock(int clusterId) {
QueryBuilder query =
start().and(
start(Document.ID).is(Integer.toString(clusterId)).get(),
start(ClusterNodeInfo.REV_RECOVERY_LOCK).notEquals(RecoverLockState.ACQUIRED.name()).get()
);
DBObject returnFields = new BasicDBObject();
returnFields.put("_id", 1);
BasicDBObject setUpdates = new BasicDBObject();
setUpdates.append(ClusterNodeInfo.REV_RECOVERY_LOCK, RecoverLockState.ACQUIRED.name());
BasicDBObject update = new BasicDBObject();
update.append("$set", setUpdates);
DBObject oldNode = getClusterNodeCollection().findAndModify(query.get(), returnFields,
null /*sort*/, false /*remove*/, update, false /*returnNew*/,
false /*upsert*/);
return oldNode != null;
}
@Override
public boolean isRecoveryNeeded(long currentTime) {
QueryBuilder query =
start(ClusterNodeInfo.STATE).is(ClusterNodeInfo.ClusterNodeState.ACTIVE.name())
.put(ClusterNodeInfo.LEASE_END_KEY).lessThan(currentTime)
.put(ClusterNodeInfo.REV_RECOVERY_LOCK).notEquals(RecoverLockState.ACQUIRED.name());
return getClusterNodeCollection().findOne(query.get()) != null;
}
private DBCollection getNodeCollection() {
return store.getDBCollection(Collection.NODES);
}
private DBCollection getClusterNodeCollection() {
return store.getDBCollection(Collection.CLUSTER_NODES);
}
}