xingtanzjr commented on code in PR #9644: URL: https://github.com/apache/iotdb/pull/9644#discussion_r1171204334
########## server/src/main/java/org/apache/iotdb/db/metadata/cache/DataNodeDevicePathCache.java: ########## @@ -0,0 +1,69 @@ +/* + * 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.iotdb.db.metadata.cache; + +import org.apache.iotdb.commons.exception.IllegalPathException; +import org.apache.iotdb.commons.path.PartialPath; +import org.apache.iotdb.db.conf.IoTDBConfig; +import org.apache.iotdb.db.conf.IoTDBDescriptor; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; + +/** This cache is for reducing duplicated DeviceId PartialPath initialization in write process. */ +public class DataNodeDevicePathCache { + + private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig(); + + private final Cache<String, PartialPath> devicePathCache; + + private DataNodeDevicePathCache() { + devicePathCache = Caffeine.newBuilder().maximumSize(config.getDevicePathCacheSize()).build(); + } + + public static DataNodeDevicePathCache getInstance() { + return DataNodeDevicePathCache.DataNodeDevicePathCacheHolder.INSTANCE; + } + + /** singleton pattern. */ + private static class DataNodeDevicePathCacheHolder { + private static final DataNodeDevicePathCache INSTANCE = new DataNodeDevicePathCache(); + } + + public PartialPath getPartialPath(String deviceId) throws IllegalPathException { + try { + return devicePathCache.get( + deviceId, + path -> { + try { + return new PartialPath(path); + } catch (IllegalPathException e) { + throw new IllegalArgumentException(e); + } + }); + } catch (IllegalArgumentException e) { Review Comment: Why shall we catch `IllegalArgumentException` here -- 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]
