thomasmueller commented on code in PR #2689: URL: https://github.com/apache/jackrabbit-oak/pull/2689#discussion_r2754873927
########## oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/index/diff/DiffIndex.java: ########## @@ -0,0 +1,242 @@ +/* + * 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.diff; + +import java.io.IOException; +import java.io.InputStream; +import java.net.URLEncoder; +import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.Comparator; + +import org.apache.jackrabbit.oak.api.PropertyState; +import org.apache.jackrabbit.oak.api.Type; +import org.apache.jackrabbit.oak.commons.PathUtils; +import org.apache.jackrabbit.oak.commons.json.JsonObject; +import org.apache.jackrabbit.oak.plugins.index.IndexConstants; +import org.apache.jackrabbit.oak.plugins.index.IndexName; +import org.apache.jackrabbit.oak.plugins.tree.TreeConstants; +import org.apache.jackrabbit.oak.spi.state.NodeBuilder; +import org.apache.jackrabbit.oak.spi.state.NodeStore; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Processing of diff indexes, that is nodes under "/oak:index/diff.index". A + * diff index contains differences to existing indexes, and possibly new + * (custom) indexes in the form of JSON. These changes can then be merged + * (applied) to the index definitions. This allows to simplify index management, + * because it allows to modify (add, update) indexes in a simple way. + */ +public class DiffIndex { + + private static final Logger LOG = LoggerFactory.getLogger(DiffIndex.class); + + /** + * Apply changes to the index definitions. That means merge the index diff with + * the existing indexes, creating new index versions. It might also mean to + * remove old (merged) indexes if the diff no longer contains them. + * + * @param store the node store + * @param indexDefinitions the /oak:index node + */ + public static void applyDiffIndexChanges(NodeStore store, NodeBuilder indexDefinitions) { + JsonObject newImageLuceneDefinitions = null; + for (String diffIndex : new String[] { DiffIndexMerger.DIFF_INDEX, DiffIndexMerger.DIFF_INDEX_OPTIMIZER }) { + if (!indexDefinitions.hasChildNode(diffIndex)) { + continue; + } + NodeBuilder diffIndexDefinition = indexDefinitions.child(diffIndex); + NodeBuilder diffContent = diffIndexDefinition.getChildNode("diff.json").getChildNode("jcr:content"); + if (!diffContent.exists()) { + continue; + } + PropertyState lastMod = diffContent.getProperty("jcr:lastModified"); Review Comment: There probably is. I agree we are not consistently using these constants, so there is a risk of typos. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
