| /* |
| * 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.query.pool; |
| |
| import org.apache.iotdb.db.concurrent.IoTDBThreadPoolFactory; |
| import org.apache.iotdb.db.concurrent.ThreadName; |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.engine.flush.pool.AbstractPoolManager; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * This thread pool is used to read data for raw data query. Thread named by Sub_Raw_Query. |
| * |
| * <p>Execute ReadTask() in RawQueryReadTaskPoolManager |
| */ |
| public class RawQueryReadTaskPoolManager extends AbstractPoolManager { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(RawQueryReadTaskPoolManager.class); |
| |
| private RawQueryReadTaskPoolManager() { |
| int threadCnt = IoTDBDescriptor.getInstance().getConfig().getConcurrentSubRawQueryThread(); |
| pool = |
| IoTDBThreadPoolFactory.newFixedThreadPool( |
| threadCnt, ThreadName.SUB_RAW_QUERY_SERVICE.getName()); |
| } |
| |
| public static RawQueryReadTaskPoolManager getInstance() { |
| return RawQueryReadTaskPoolManager.InstanceHolder.instance; |
| } |
| |
| @Override |
| public Logger getLogger() { |
| return LOGGER; |
| } |
| |
| @Override |
| public String getName() { |
| return "raw query read task"; |
| } |
| |
| @Override |
| public void start() { |
| if (pool == null) { |
| int threadCnt = |
| Math.min( |
| Runtime.getRuntime().availableProcessors(), |
| IoTDBDescriptor.getInstance().getConfig().getConcurrentSubRawQueryThread()); |
| pool = |
| IoTDBThreadPoolFactory.newFixedThreadPool( |
| threadCnt, ThreadName.SUB_RAW_QUERY_SERVICE.getName()); |
| } |
| } |
| |
| @Override |
| public void stop() { |
| if (pool != null) { |
| close(); |
| pool = null; |
| } |
| } |
| |
| private static class InstanceHolder { |
| |
| private InstanceHolder() { |
| // allowed to do nothing |
| } |
| |
| private static RawQueryReadTaskPoolManager instance = new RawQueryReadTaskPoolManager(); |
| } |
| } |