| /* |
| * 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.queryengine.plan.analyze.cache.schema.lastcache; |
| |
| import org.apache.iotdb.db.queryengine.plan.analyze.cache.schema.lastcache.value.ILastCacheValue; |
| import org.apache.iotdb.db.queryengine.plan.analyze.cache.schema.lastcache.value.LastCacheValue; |
| |
| import org.apache.tsfile.read.TimeValuePair; |
| import org.apache.tsfile.utils.TsPrimitiveType; |
| |
| /** |
| * This class possesses the ILastCacheValue and implements the basic last cache operations. |
| * |
| * <p>The ILastCacheValue may be extended to ILastCacheValue List in future to support batched last |
| * value cache. |
| */ |
| public class LastCacheContainer implements ILastCacheContainer { |
| |
| ILastCacheValue lastCacheValue; |
| |
| @Override |
| public TimeValuePair getCachedLast() { |
| return lastCacheValue == null ? null : lastCacheValue.getTimeValuePair(); |
| } |
| |
| @Override |
| public synchronized int updateCachedLast( |
| TimeValuePair timeValuePair, boolean highPriorityUpdate, Long latestFlushedTime) { |
| if (highPriorityUpdate) { // for write, we won't cache null value |
| if (timeValuePair == null || timeValuePair.getValue() == null) { |
| return 0; |
| } |
| } else { // for read, we need to cache null value, because it means that there is no data for |
| // this time series |
| if (timeValuePair == null) { |
| return 0; |
| } |
| } |
| |
| if (lastCacheValue == null) { |
| // If no cached last, (1) a last query (2) an unseq insertion or (3) a seq insertion will |
| // update cache. |
| if (!highPriorityUpdate || latestFlushedTime <= timeValuePair.getTimestamp()) { |
| lastCacheValue = new LastCacheValue(timeValuePair.getTimestamp(), timeValuePair.getValue()); |
| return lastCacheValue.estimateSize(); |
| } |
| } else if (timeValuePair.getTimestamp() > lastCacheValue.getTimestamp() |
| || (timeValuePair.getTimestamp() == lastCacheValue.getTimestamp() && highPriorityUpdate)) { |
| TsPrimitiveType oldValue = lastCacheValue.getValue(); |
| lastCacheValue.setTimestamp(timeValuePair.getTimestamp()); |
| lastCacheValue.setValue(timeValuePair.getValue()); |
| return getDiffSize(oldValue, timeValuePair.getValue()); |
| } |
| return 0; |
| } |
| |
| @Override |
| public int invalidateLastCache() { |
| int size = lastCacheValue.estimateSize(); |
| lastCacheValue = null; |
| return size; |
| } |
| |
| private int getDiffSize(TsPrimitiveType oldValue, TsPrimitiveType newValue) { |
| if (oldValue == null) { |
| return newValue == null ? 0 : newValue.getSize(); |
| } else if (oldValue instanceof TsPrimitiveType.TsBinary) { |
| return (newValue == null ? 0 : newValue.getSize()) - oldValue.getSize(); |
| } else { |
| return newValue == null ? -oldValue.getSize() : 0; |
| } |
| } |
| |
| /** |
| * Total basic 100B |
| * |
| * <ul> |
| * <li>LastCacheContainer Object header, 8B |
| * <li>ILastCacheValue reference, 8B |
| * </ul> |
| */ |
| @Override |
| public int estimateSize() { |
| return 16 + (lastCacheValue == null ? 0 : lastCacheValue.estimateSize()); |
| } |
| } |