bigreybear commented on code in PR #9664: URL: https://github.com/apache/iotdb/pull/9664#discussion_r1172757418
########## server/src/main/java/org/apache/iotdb/db/metadata/cache/DataNodeTemplateSchemaCache.java: ########## @@ -0,0 +1,178 @@ +/* + * 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.path.PartialPath; +import org.apache.iotdb.db.conf.IoTDBConfig; +import org.apache.iotdb.db.conf.IoTDBDescriptor; +import org.apache.iotdb.db.exception.metadata.template.TemplateImcompatibeException; +import org.apache.iotdb.db.metadata.template.ClusterTemplateManager; +import org.apache.iotdb.db.metadata.template.ITemplateManager; +import org.apache.iotdb.db.metadata.template.Template; +import org.apache.iotdb.db.mpp.common.schematree.IMeasurementSchemaInfo; +import org.apache.iotdb.db.mpp.plan.analyze.schema.ISchemaComputationWithAutoCreation; +import org.apache.iotdb.tsfile.utils.Pair; +import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema; +import org.apache.iotdb.tsfile.write.schema.MeasurementSchema; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.Weigher; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.Optional; +import java.util.concurrent.locks.ReentrantReadWriteLock; + +public class DataNodeTemplateSchemaCache { + + private static final Logger logger = LoggerFactory.getLogger(DataNodeTemplateSchemaCache.class); + private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig(); + + private final Cache<PartialPath, Integer> cache; + + private final ITemplateManager templateManager = ClusterTemplateManager.getInstance(); + + // cache update due to activation or clear procedure + private final ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock(false); + + private DataNodeTemplateSchemaCache() { + // TODO proprietary config parameter expected + cache = + Caffeine.newBuilder() + .maximumWeight(config.getAllocateMemoryForSchemaCache()) + .weigher( + (Weigher<PartialPath, Integer>) (key, val) -> (PartialPath.estimateSize(key) + 16)) + .build(); + } + + public static DataNodeTemplateSchemaCache getInstance() { + return DataNodeTemplateSchemaCacheHolder.INSTANCE; + } + + /** singleton pattern. */ + private static class DataNodeTemplateSchemaCacheHolder { + private static final DataNodeTemplateSchemaCache INSTANCE = new DataNodeTemplateSchemaCache(); + } + + public void takeReadLock() { + readWriteLock.readLock().lock(); + } + + public void releaseReadLock() { + readWriteLock.readLock().unlock(); + } + + public void takeWriteLock() { + readWriteLock.writeLock().lock(); + } + + public void releaseWriteLock() { + readWriteLock.writeLock().unlock(); + } + + public Integer get(PartialPath path) { + readWriteLock.readLock().lock(); + try { + return cache.getIfPresent(path); + } finally { + readWriteLock.readLock().unlock(); + } + } + + public void put(PartialPath path, Integer id) { + readWriteLock.writeLock().lock(); + try { + cache.put(path, id); + } finally { + readWriteLock.writeLock().unlock(); + } + } + + public void invalidateCache() { + cache.invalidateAll(); + } + + public boolean compatibleCheckAndPut( + ISchemaComputationWithAutoCreation schemaComputationWithAutoCreation) + throws TemplateImcompatibeException { + PartialPath devicePath = schemaComputationWithAutoCreation.getDevicePath(); + String[] measurements = schemaComputationWithAutoCreation.getMeasurements(); + + Template template = null; + if (this.get(devicePath) != null) { + // exists in cache, to check compatible + template = templateManager.getTemplate(this.get(devicePath)); + } else { + // check validity to activate + Optional<Pair<Template, ?>> templateInfo = + Optional.ofNullable( + templateManager.checkTemplateSetInfo( + schemaComputationWithAutoCreation.getDevicePath())); + + // ONE check is sufficient due to the restriction of activation + if (templateInfo.isPresent() && templateInfo.get().left.hasSchema(measurements[0])) { + // measurement overlapped, check compatible to activate + template = templateInfo.get().left; + } + } + + if (template != null) { + schemaComputationWithAutoCreation.computeDevice(template.isDirectAligned()); + for (int i = 0; i < measurements.length; i++) { + if (!template.hasSchema(measurements[i])) { + throw new TemplateImcompatibeException( + String.format( + "Cannot create timeseries[%s] not subject to template[%s] under" + + "an activated node[%s].", + measurements[i], template.getName(), devicePath.getDevicePath())); + } + + IMeasurementSchema schema = template.getSchema(measurements[i]); + schemaComputationWithAutoCreation.computeMeasurement( + i, + new IMeasurementSchemaInfo() { + @Override + public String getName() { + return schema.getMeasurementId(); + } + + @Override + public MeasurementSchema getSchema() { + return new MeasurementSchema( + schema.getMeasurementId(), + schema.getType(), + schema.getTimeTSEncoding(), + schema.getCompressor()); + } + + @Override + public String getAlias() { + // FIXME alias is not used CURRENTLY + return null; + } + }); + } + this.put(devicePath, template.getId()); Review Comment: this method had been refactored. now the check against cache and update of the cache has been split, hence the constraint of activation of template is decoupled from the cache mechanism. -- This is an automated message from the Apache Git Service. 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