| /* |
| * 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.execution.fragment; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| |
| import org.apache.tsfile.read.TimeValuePair; |
| import org.apache.tsfile.utils.Pair; |
| |
| import javax.annotation.concurrent.GuardedBy; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| public class DataNodeQueryContext { |
| // left of Pair is DataNodeSeriesScanNum, right of Pair is the last value waiting to be updated |
| @GuardedBy("lock") |
| private final Map<PartialPath, Pair<AtomicInteger, TimeValuePair>> uncachedPathToSeriesScanInfo; |
| |
| private final AtomicInteger dataNodeFINum; |
| |
| // TODO consider more fine-grained locks, now the AtomicInteger in uncachedPathToSeriesScanInfo is |
| // unnecessary |
| private final ReentrantLock lock = new ReentrantLock(); |
| |
| public DataNodeQueryContext(int dataNodeFINum) { |
| this.uncachedPathToSeriesScanInfo = new HashMap<>(); |
| this.dataNodeFINum = new AtomicInteger(dataNodeFINum); |
| } |
| |
| public boolean unCached(PartialPath path) { |
| return uncachedPathToSeriesScanInfo.containsKey(path); |
| } |
| |
| public void addUnCachePath(PartialPath path, AtomicInteger dataNodeSeriesScanNum) { |
| uncachedPathToSeriesScanInfo.put(path, new Pair<>(dataNodeSeriesScanNum, null)); |
| } |
| |
| public Pair<AtomicInteger, TimeValuePair> getSeriesScanInfo(PartialPath path) { |
| return uncachedPathToSeriesScanInfo.get(path); |
| } |
| |
| public int decreaseDataNodeFINum() { |
| return dataNodeFINum.decrementAndGet(); |
| } |
| |
| public void lock() { |
| lock.lock(); |
| } |
| |
| public void unLock() { |
| lock.unlock(); |
| } |
| } |