choubenson commented on code in PR #12122: URL: https://github.com/apache/iotdb/pull/12122#discussion_r1576397733
########## iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/schema/ttl/TTLCache.java: ########## @@ -0,0 +1,275 @@ +/* + * 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.commons.schema.ttl; + +import org.apache.iotdb.commons.conf.CommonDescriptor; +import org.apache.iotdb.commons.conf.IoTDBConstant; +import org.apache.iotdb.commons.path.PartialPath; +import org.apache.iotdb.commons.utils.CommonDateTimeUtils; +import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; + +import javax.annotation.concurrent.NotThreadSafe; + +import java.io.BufferedInputStream; +import java.io.BufferedOutputStream; +import java.io.IOException; +import java.util.HashMap; +import java.util.LinkedHashMap; +import java.util.Map; +import java.util.Objects; + +@NotThreadSafe +public class TTLCache { + + private final CacheNode ttlCacheTree; + public static final long NULL_TTL = -1; + + private int ttlCount; + + public TTLCache() { + ttlCacheTree = new CacheNode(IoTDBConstant.PATH_ROOT); + long defaultTTL = + CommonDateTimeUtils.convertMilliTimeWithPrecision( + CommonDescriptor.getInstance().getConfig().getDefaultTTLInMs(), + CommonDescriptor.getInstance().getConfig().getTimestampPrecision()); + defaultTTL = defaultTTL <= 0 ? Long.MAX_VALUE : defaultTTL; + ttlCacheTree.addChild(IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD, defaultTTL); + ttlCount = 1; + } + + /** + * Put ttl into cache tree. + * + * @param nodes should be prefix path or specific device path without wildcard + */ + public void setTTL(String[] nodes, long ttl) { + if (nodes.length < 2 || ttl <= 0) { + return; + } + CacheNode parent = ttlCacheTree; + for (int i = 1; i < nodes.length; i++) { + CacheNode child = parent.getChild(nodes[i]); + if (child == null) { + parent.addChild(nodes[i], NULL_TTL); + child = parent.getChild(nodes[i]); + } + parent = child; + } + if (parent.ttl == NULL_TTL) { + ttlCount++; + } + parent.ttl = ttl; + } + + /** + * Unset ttl and remove all useless nodes. If the path to be removed is internal node, then just + * reset its ttl. Else, find the sub path and remove it. + * + * @param nodes path to be removed + */ + public void unsetTTL(String[] nodes) { + if (nodes.length < 2) { + return; + } else if (nodes.length == 2) { + // if path equals to root.**, then unset it to configured ttl + if (nodes[0].equals(IoTDBConstant.PATH_ROOT) + && nodes[1].equals(IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD)) { + ttlCacheTree.getChild(IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD).ttl = + CommonDescriptor.getInstance().getConfig().getDefaultTTLInMs(); + return; + } + } + CacheNode parent = ttlCacheTree; + int index = 0; + boolean usefulFlag; + CacheNode parentOfSubPathToBeRemoved = null; + for (int i = 1; i < nodes.length; i++) { + usefulFlag = !parent.getChildren().isEmpty() || parent.ttl != NULL_TTL; + CacheNode child = parent.getChild(nodes[i]); + if (child == null) { + // there is no matching path on ttl cache tree + return; + } + if (usefulFlag) { + parentOfSubPathToBeRemoved = parent; + index = i; + } + parent = child; + } + // currently, parent is the leaf node of the path to be removed + if (parent.ttl != NULL_TTL) { + ttlCount--; + } + + if (!parent.getChildren().isEmpty()) { + // node to be removed is internal node, then just reset its ttl + parent.ttl = NULL_TTL; + return; + } + + // node to be removed is leaf node, then remove corresponding node of this path from cache tree + if (parentOfSubPathToBeRemoved != null) { + parentOfSubPathToBeRemoved.removeChild(nodes[index]); + } + } + + /** + * Get ttl from cache tree. Return the TTL of the node closest to the path leaf node that has a + * TTL which is not NULL_TTL. + * + * @param nodes should be prefix path or specific device path without wildcard + */ + public long getTTL(String[] nodes) { + long ttl = ttlCacheTree.ttl; + CacheNode parent = ttlCacheTree; + for (int i = 1; i < nodes.length; i++) { + CacheNode child = parent.getChild(IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD); + ttl = child != null ? child.ttl : ttl; + parent = parent.getChild(nodes[i]); + if (parent == null) { + break; + } + } + ttl = parent != null && parent.ttl != NULL_TTL ? parent.ttl : ttl; + return ttl; + } + + public Map<String, Long> getAllTTLUnderOneNode(String[] nodes) { + Map<String, Long> pathTTLMap = new HashMap<>(); + CacheNode node = ttlCacheTree; + for (int i = 1; i < nodes.length; i++) { + node = node.getChild(nodes[i]); + if (node == null) { + return pathTTLMap; + } + } + + // get all ttl under current node + dfsCacheTree(pathTTLMap, new StringBuilder(new PartialPath(nodes).getFullPath()), node); + return pathTTLMap; + } + + /** + * Return the ttl of path. If the path does not exist, it means that the TTL is not set, and + * return NULL_TTL. + */ + public long getNodeTTL(String[] nodes) { Review Comment: Resolved. -- 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: reviews-unsubscr...@iotdb.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
