frankgh commented on code in PR #212: URL: https://github.com/apache/cassandra-sidecar/pull/212#discussion_r2114658618
########## server/src/main/java/org/apache/cassandra/sidecar/livemigration/LiveMigrationInstanceMetadataUtil.java: ########## @@ -0,0 +1,193 @@ +/* + * 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.cassandra.sidecar.livemigration; + +import java.nio.file.Paths; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Hashtable; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import org.apache.cassandra.sidecar.cluster.instance.InstanceMetadata; +import org.jetbrains.annotations.NotNull; + +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_CDC_RAW_DIR_PATH; +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_COMMITLOG_DIR_PATH; +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_DATA_FILE_DIR_PATH; +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_HINTS_DIR_PATH; +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_LOCAL_SYSTEM_DATA_FILE_DIR_PATH; +import static org.apache.cassandra.sidecar.common.ApiEndpointsV1.LIVE_MIGRATION_SAVED_CACHES_DIR_PATH; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.CDC_RAW_DIR_PLACEHOLDER; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.COMMITLOG_DIR_PLACEHOLDER; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.DATA_FILE_DIR_PLACEHOLDER; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.HINTS_DIR_PLACEHOLDER; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.LOCAL_SYSTEM_DATA_FILE_DIR_PLACEHOLDER; +import static org.apache.cassandra.sidecar.livemigration.LiveMigrationPlaceholderUtil.SAVED_CACHES_DIR_PLACEHOLDER; + +/** + * Utility class for having all {@link InstanceMetadata} related helper functions related to + * Live Migration in one place. + */ +@SuppressWarnings("ConstantValue") +public class LiveMigrationInstanceMetadataUtil +{ + + /** + * List of directories Live Migration considers to transfer between source and destination. + */ + public static List<String> dirsToCopy(InstanceMetadata instanceMetadata) + { + List<String> dirsToCopy = new ArrayList<>(); + dirsToCopy.add(instanceMetadata.hintsDir()); + dirsToCopy.add(instanceMetadata.commitlogDir()); + if (instanceMetadata.savedCachesDir() != null) + { + dirsToCopy.add(instanceMetadata.savedCachesDir()); + } + if (instanceMetadata.cdcDir() != null) + { + dirsToCopy.add(instanceMetadata.cdcDir()); + } + if (instanceMetadata.localSystemDataFileDir() != null) + { + dirsToCopy.add(instanceMetadata.localSystemDataFileDir()); + } + dirsToCopy.addAll(instanceMetadata.dataDirs()); + return dirsToCopy; + } + + /** + * Returns map of directory that can be copied and the index to use while constructing + * url for file transfer. + */ + public static Map<String, String> dirPathPrefixMap(InstanceMetadata instanceMetadata) + { + Map<String, String> dirIndexMap = new Hashtable<>(); + dirIndexMap.put(instanceMetadata.hintsDir(), LIVE_MIGRATION_HINTS_DIR_PATH + "/0"); + dirIndexMap.put(instanceMetadata.commitlogDir(), LIVE_MIGRATION_COMMITLOG_DIR_PATH + "/0"); + if (instanceMetadata.savedCachesDir() != null) + { + dirIndexMap.put(instanceMetadata.savedCachesDir(), LIVE_MIGRATION_SAVED_CACHES_DIR_PATH + "/0"); + } + if (instanceMetadata.cdcDir() != null) + { + dirIndexMap.put(instanceMetadata.cdcDir(), LIVE_MIGRATION_CDC_RAW_DIR_PATH + "/0"); + } + if (instanceMetadata.localSystemDataFileDir() != null) + { + dirIndexMap.put(instanceMetadata.localSystemDataFileDir(), LIVE_MIGRATION_LOCAL_SYSTEM_DATA_FILE_DIR_PATH + "/0"); + } + for (int i = 0; i < instanceMetadata.dataDirs().size(); i++) + { + dirIndexMap.put(instanceMetadata.dataDirs().get(i), LIVE_MIGRATION_DATA_FILE_DIR_PATH + "/" + i); + } + return dirIndexMap; + } + + /** + * Returns map of directory and set of placeholders that represent the directory. + */ + public static Map<String, Set<String>> dirPlaceHoldersMap(InstanceMetadata instanceMetadata) + { + Map<String, Set<String>> placeholderMap = new Hashtable<>(); Review Comment: same comment as above for the usage of Hashtable -- This is an automated message from the Apache Git Service. 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