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/*
* 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.index.importer;
import java.util.concurrent.TimeUnit;
import org.apache.jackrabbit.oak.api.CommitFailedException;
import org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.apache.jackrabbit.oak.spi.state.NodeStore;
import org.apache.jackrabbit.oak.stats.Clock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Lock implementation for clustered scenario. The locking is done
* by setting the lease time for the lane to distant future which
* prevent AsyncIndexUpdate from running.
*/
public class ClusterNodeStoreLock implements AsyncIndexerLock<ClusteredLockToken> {
/**
* Use a looong lease time to ensure that async indexer does not start
* in between the import process which can take some time
*/
private static final long LOCK_TIMEOUT = TimeUnit.DAYS.toMillis(100);
private final Logger log = LoggerFactory.getLogger(getClass());
private final NodeStore nodeStore;
private final Clock clock;
public ClusterNodeStoreLock(NodeStore nodeStore){
this(nodeStore, Clock.SIMPLE);
}
public ClusterNodeStoreLock(NodeStore nodeStore, Clock clock) {
this.nodeStore = nodeStore;
this.clock = clock;
}
@Override
public ClusteredLockToken lock(String asyncIndexerLane) throws CommitFailedException {
NodeBuilder builder = nodeStore.getRoot().builder();
NodeBuilder async = builder.child(":async");
String leaseName = AsyncIndexUpdate.leasify(asyncIndexerLane);
long leaseEndTime = clock.getTime() + LOCK_TIMEOUT;
if (async.hasProperty(leaseName)){
log.info("AsyncIndexer found to be running currently. Lease update would cause its" +
"commit to fail. Such a failure should be ignored");
}
//TODO Attempt few times if merge failure due to current running indexer cycle
async.setProperty(leaseName, leaseEndTime);
async.setProperty(lockName(asyncIndexerLane), true);
NodeStoreUtils.mergeWithConcurrentCheck(nodeStore, builder);
log.info("Acquired the lock for async indexer lane [{}]", asyncIndexerLane);
return new ClusteredLockToken(asyncIndexerLane, leaseEndTime);
}
@Override
public void unlock(ClusteredLockToken token) throws CommitFailedException {
String leaseName = AsyncIndexUpdate.leasify(token.laneName);
NodeBuilder builder = nodeStore.getRoot().builder();
NodeBuilder async = builder.child(":async");
async.removeProperty(leaseName);
async.removeProperty(lockName(token.laneName));
NodeStoreUtils.mergeWithConcurrentCheck(nodeStore, builder);
log.info("Remove the lock for async indexer lane [{}]", token.laneName);
}
public boolean isLocked(String asyncIndexerLane) {
NodeState async = nodeStore.getRoot().getChildNode(":async");
String leaseName = lockName(asyncIndexerLane);
return async.hasProperty(leaseName);
}
private static String lockName(String asyncIndexerLane) {
return asyncIndexerLane + "-lock";
}
}
class ClusteredLockToken implements AsyncIndexerLock.LockToken {
final String laneName;
final long timeout;
ClusteredLockToken(String laneName, long timeout) {
this.laneName = laneName;
this.timeout = timeout;
}
}