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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.elastic;
import org.apache.jackrabbit.oak.plugins.index.search.IndexDefinition;
import org.apache.jackrabbit.oak.plugins.index.search.spi.query.FulltextIndexTracker;
import org.apache.jackrabbit.oak.spi.commit.CommitInfo;
import org.apache.jackrabbit.oak.spi.commit.Observer;
import org.apache.jackrabbit.oak.spi.state.EqualsDiff;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.jetbrains.annotations.NotNull;
public class ElasticIndexTracker extends FulltextIndexTracker<ElasticIndexNodeManager, ElasticIndexNode> implements Observer {
private final ElasticConnection elasticConnection;
private final ElasticMetricHandler elasticMetricHandler;
public ElasticIndexTracker(@NotNull ElasticConnection elasticConnection, @NotNull ElasticMetricHandler elasticMetricHandler) {
this.elasticConnection = elasticConnection;
this.elasticMetricHandler = elasticMetricHandler;
}
@Override
public boolean isUpdateNeeded(NodeState before, NodeState after) {
// for Elastic, we are not interested in checking for updates on :status, index definition is enough.
// The :status gets updated every time the indexed content is changed (with properties like last_update_ts),
// removing the check on :status reduces drastically the contention between queries (that need to acquire the
// read lock) and updates (need to acquire the write lock).
// Moreover, we don't check diffs in stored index definitions since are not created for elastic.
return !IgnoreStatusDiff.equals(before, after);
}
@Override
protected ElasticIndexNodeManager openIndex(String path, NodeState root, NodeState node) {
return new ElasticIndexNodeManager(path, root, elasticConnection);
}
public ElasticIndexNode acquireIndexNode(String path) {
return super.acquireIndexNode(path, ElasticIndexDefinition.TYPE_ELASTICSEARCH);
}
@Override
public void contentChanged(@NotNull NodeState root, @NotNull CommitInfo info) {
update(root);
}
public ElasticMetricHandler getElasticMetricHandler() {
return elasticMetricHandler;
}
static class IgnoreStatusDiff extends EqualsDiff {
public static boolean equals(NodeState before, NodeState after) {
return before.exists() == after.exists()
&& after.compareAgainstBaseState(before, new IgnoreStatusDiff());
}
/**
* The behaviour of this method is not immediately obvious from the signature.
* For this reason, the javadoc from NodeStateDiff is copied below.
* When false is returned, the comparison is aborted because something has changed.
* If the changed node is the status node, the comparison is continued otherwise we call the super method.
* The super method will return false if the node is not the status node, and it has changed.
* <p>
* Called for all child nodes that may contain changes between the before
* and after states. The comparison implementation is expected to make an
* effort to avoid calling this method on child nodes under which nothing
* has changed.
*
* @param name name of the changed child node
* @param before child node state before the change
* @param after child node state after the change
* @return {@code true} to continue the comparison, {@code false} to abort.
* Abort will stop comparing completely, that means sibling nodes
* and sibling nodes of all parents are not further compared.
*/
@Override
public boolean childNodeChanged(String name, NodeState before, NodeState after) {
return IndexDefinition.STATUS_NODE.equals(name) || super.childNodeChanged(name, before, after);
}
}
}