| /* |
| * 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.lastCache; |
| |
| import org.apache.iotdb.commons.path.MeasurementPath; |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.engine.querycontext.QueryDataSource; |
| import org.apache.iotdb.db.metadata.lastCache.container.ILastCacheContainer; |
| import org.apache.iotdb.db.metadata.mnode.IEntityMNode; |
| import org.apache.iotdb.db.metadata.mnode.IMNode; |
| import org.apache.iotdb.db.metadata.mnode.IMeasurementMNode; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| import org.apache.iotdb.db.query.control.QueryResourceManager; |
| import org.apache.iotdb.db.query.executor.fill.LastPointReader; |
| import org.apache.iotdb.tsfile.read.TimeValuePair; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| // this class provides all the operations on last cache |
| public class LastCacheManager { |
| |
| private static final Logger logger = LoggerFactory.getLogger(LastCacheManager.class); |
| |
| private static final boolean CACHE_ENABLED = |
| IoTDBDescriptor.getInstance().getConfig().isLastCacheEnabled(); |
| |
| /** |
| * get the last cache value of time series of given seriesPath |
| * |
| * @param node the measurementMNode holding the lastCache When invoker only has the target |
| * seriesPath, the node could be null and SchemaProcessor will search the node |
| * @return the last cache value |
| */ |
| public static TimeValuePair getLastCache(IMeasurementMNode node) { |
| if (node == null) { |
| return null; |
| } |
| |
| checkIsTemplateLastCacheAndSetIfAbsent(node); |
| |
| ILastCacheContainer lastCacheContainer = node.getLastCacheContainer(); |
| return lastCacheContainer.getCachedLast(); |
| } |
| |
| /** |
| * update the last cache value of time series of given seriesPath |
| * |
| * @param node the measurementMNode holding the lastCache When invoker only has the target |
| * seriesPath, the node could be null and SchemaProcessor will search the node |
| * @param timeValuePair the latest point value |
| * @param highPriorityUpdate the last value from insertPlan is high priority |
| * @param latestFlushedTime latest flushed time |
| */ |
| public static void updateLastCache( |
| IMeasurementMNode node, |
| TimeValuePair timeValuePair, |
| boolean highPriorityUpdate, |
| Long latestFlushedTime) { |
| if (node == null) { |
| return; |
| } |
| |
| checkIsTemplateLastCacheAndSetIfAbsent(node); |
| |
| ILastCacheContainer lastCacheContainer = node.getLastCacheContainer(); |
| lastCacheContainer.updateCachedLast(timeValuePair, highPriorityUpdate, latestFlushedTime); |
| } |
| |
| /** |
| * reset the last cache value of time series of given seriesPath |
| * |
| * @param node the measurementMNode holding the lastCache When invoker only has the target |
| * seriesPath, the node could be null and SchemaProcessor will search the node |
| */ |
| public static void resetLastCache(IMeasurementMNode node) { |
| if (node == null) { |
| return; |
| } |
| |
| checkIsTemplateLastCacheAndSetIfAbsent(node); |
| |
| ILastCacheContainer lastCacheContainer = node.getLastCacheContainer(); |
| lastCacheContainer.resetLastCache(); |
| } |
| |
| private static void checkIsTemplateLastCacheAndSetIfAbsent(IMeasurementMNode node) { |
| IEntityMNode entityMNode = node.getParent(); |
| if (entityMNode == null) { |
| // cluster cached remote measurementMNode doesn't have parent |
| return; |
| } |
| String measurement = node.getName(); |
| |
| // if entityMNode doesn't have this child, the child is derived from template |
| if (!entityMNode.hasChild(measurement)) { |
| ILastCacheContainer lastCacheContainer = entityMNode.getLastCacheContainer(measurement); |
| node.setLastCacheContainer(lastCacheContainer); |
| } |
| } |
| |
| /** |
| * delete all the last cache value of any timeseries or aligned timeseries under the entity |
| * |
| * @param node entity node |
| */ |
| public static void deleteLastCacheByDevice(IEntityMNode node) { |
| // process lastCache of timeseries represented by measurementNode |
| for (IMNode child : node.getChildren().values()) { |
| if (child.isMeasurement()) { |
| child.getAsMeasurementMNode().getLastCacheContainer().resetLastCache(); |
| if (logger.isDebugEnabled()) { |
| logger.debug( |
| "[tryToDeleteLastCacheByDevice] Last cache for path: {} is set to null", |
| child.getFullPath()); |
| } |
| } |
| } |
| // process lastCache of timeseries represented by template |
| for (Map.Entry<String, ILastCacheContainer> entry : node.getTemplateLastCaches().entrySet()) { |
| entry.getValue().resetLastCache(); |
| if (logger.isDebugEnabled()) { |
| logger.debug( |
| "[tryToDeleteLastCacheByDevice] Last cache for path: {} is set to null", |
| node.getPartialPath().concatNode(entry.getKey()).getFullPath()); |
| } |
| } |
| } |
| |
| /** |
| * delete the last cache value of timeseries or subMeasurement of some aligned timeseries, which |
| * is under the entity and matching the originalPath |
| * |
| * @param node entity node |
| * @param originalPath origin timeseries path |
| * @param startTime startTime |
| * @param endTime endTime |
| */ |
| public static void deleteLastCacheByDevice( |
| IEntityMNode node, PartialPath originalPath, long startTime, long endTime) { |
| PartialPath path; |
| ILastCacheContainer lastCacheContainer; |
| |
| // process lastCache of timeseries represented by measurementNode |
| IMeasurementMNode measurementMNode; |
| for (IMNode child : node.getChildren().values()) { |
| if (child == null || !child.isMeasurement()) { |
| continue; |
| } |
| path = child.getPartialPath(); |
| measurementMNode = child.getAsMeasurementMNode(); |
| if (originalPath.matchFullPath(path)) { |
| lastCacheContainer = measurementMNode.getLastCacheContainer(); |
| if (lastCacheContainer == null) { |
| continue; |
| } |
| deleteLastCache(path, lastCacheContainer, startTime, endTime); |
| } |
| } |
| |
| // process lastCache of timeseries represented by template |
| for (Map.Entry<String, ILastCacheContainer> entry : node.getTemplateLastCaches().entrySet()) { |
| path = node.getPartialPath().concatNode(entry.getKey()); |
| if (originalPath.matchFullPath(path)) { |
| lastCacheContainer = entry.getValue(); |
| if (lastCacheContainer == null) { |
| continue; |
| } |
| deleteLastCache(path, lastCacheContainer, startTime, endTime); |
| } |
| } |
| } |
| |
| private static void deleteLastCache( |
| PartialPath path, ILastCacheContainer lastCacheContainer, long startTime, long endTime) { |
| TimeValuePair lastPair = lastCacheContainer.getCachedLast(); |
| if (lastPair != null |
| && startTime <= lastPair.getTimestamp() |
| && lastPair.getTimestamp() <= endTime) { |
| lastCacheContainer.resetLastCache(); |
| if (logger.isDebugEnabled()) { |
| logger.debug( |
| "[tryToDeleteLastCache] Last cache for path: {} is set to null", path.getFullPath()); |
| } |
| } |
| } |
| |
| /** |
| * get the last value of timeseries represented by given measurementMNode get last value from |
| * cache in measurementMNode if absent, get last value from file |
| * |
| * @param node measurementMNode representing the target timeseries |
| * @param queryContext query context |
| * @return the last value |
| */ |
| public static long getLastTimeStamp(IMeasurementMNode node, QueryContext queryContext) { |
| TimeValuePair last = getLastCache(node); |
| if (last != null) { |
| return getLastCache(node).getTimestamp(); |
| } else { |
| try { |
| // for the parameter "ascending": true or false both ok here, |
| // because LastPointReader will do itself sort logic instead of depending on fillOrderIndex. |
| MeasurementPath measurementPath = node.getMeasurementPath(); |
| QueryDataSource dataSource = |
| QueryResourceManager.getInstance() |
| .getQueryDataSource(measurementPath, queryContext, null, false); |
| Set<String> measurementSet = new HashSet<>(); |
| measurementSet.add(node.getName()); |
| LastPointReader lastReader = |
| new LastPointReader( |
| measurementPath, |
| node.getSchema().getType(), |
| measurementSet, |
| queryContext, |
| dataSource, |
| Long.MAX_VALUE, |
| null); |
| last = lastReader.readLastPoint(); |
| if (CACHE_ENABLED && last != null && last.getValue() != null) { |
| updateLastCache(node, last, false, Long.MIN_VALUE); |
| } |
| return (last != null ? last.getTimestamp() : Long.MIN_VALUE); |
| } catch (Exception e) { |
| logger.error( |
| "Something wrong happened while trying to get last time value pair of {}", |
| node.getFullPath(), |
| e); |
| return Long.MIN_VALUE; |
| } |
| } |
| } |
| } |