| /** |
| * 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.hadoop.ozone.container.common.report; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| import com.google.protobuf.GeneratedMessage; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.ozone.container.common.statemachine.StateContext; |
| import org.apache.hadoop.util.concurrent.HadoopExecutors; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * ReportManager is responsible for managing all the {@link ReportPublisher} |
| * and also provides {@link ScheduledExecutorService} to ReportPublisher |
| * which should be used for scheduling the reports. |
| */ |
| public final class ReportManager { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(ReportManager.class); |
| |
| private final StateContext context; |
| private final List<ReportPublisher> publishers; |
| private final ScheduledExecutorService executorService; |
| |
| /** |
| * Construction of {@link ReportManager} should be done via |
| * {@link ReportManager.Builder}. |
| * |
| * @param context StateContext which holds the report |
| * @param publishers List of publishers which generates report |
| */ |
| private ReportManager(StateContext context, |
| List<ReportPublisher> publishers) { |
| this.context = context; |
| this.publishers = publishers; |
| this.executorService = HadoopExecutors.newScheduledThreadPool( |
| publishers.size(), |
| new ThreadFactoryBuilder().setDaemon(true) |
| .setNameFormat("Datanode ReportManager Thread - %d").build()); |
| } |
| |
| /** |
| * Initializes ReportManager, also initializes all the configured |
| * report publishers. |
| */ |
| public void init() { |
| for (ReportPublisher publisher : publishers) { |
| publisher.init(context, executorService); |
| } |
| } |
| |
| /** |
| * Shutdown the ReportManager. |
| */ |
| public void shutdown() { |
| executorService.shutdown(); |
| try { |
| executorService.awaitTermination(5, TimeUnit.SECONDS); |
| } catch (Exception e) { |
| LOG.error("Failed to shutdown Report Manager", e); |
| } |
| } |
| |
| /** |
| * Returns new {@link ReportManager.Builder} which can be used to construct. |
| * {@link ReportManager} |
| * @param conf - Conf |
| * @return builder - Builder. |
| */ |
| public static Builder newBuilder(Configuration conf) { |
| return new Builder(conf); |
| } |
| |
| /** |
| * Builder to construct {@link ReportManager}. |
| */ |
| public static final class Builder { |
| |
| private StateContext stateContext; |
| private List<ReportPublisher> reportPublishers; |
| private ReportPublisherFactory publisherFactory; |
| |
| |
| private Builder(Configuration conf) { |
| this.reportPublishers = new ArrayList<>(); |
| this.publisherFactory = new ReportPublisherFactory(conf); |
| } |
| |
| /** |
| * Sets the {@link StateContext}. |
| * |
| * @param context StateContext |
| |
| * @return ReportManager.Builder |
| */ |
| public Builder setStateContext(StateContext context) { |
| stateContext = context; |
| return this; |
| } |
| |
| /** |
| * Adds publisher for the corresponding report. |
| * |
| * @param report report for which publisher needs to be added |
| * |
| * @return ReportManager.Builder |
| */ |
| public Builder addPublisherFor(Class<? extends GeneratedMessage> report) { |
| reportPublishers.add(publisherFactory.getPublisherFor(report)); |
| return this; |
| } |
| |
| /** |
| * Adds new ReportPublisher to the ReportManager. |
| * |
| * @param publisher ReportPublisher |
| * |
| * @return ReportManager.Builder |
| */ |
| public Builder addPublisher(ReportPublisher publisher) { |
| reportPublishers.add(publisher); |
| return this; |
| } |
| |
| /** |
| * Build and returns ReportManager. |
| * |
| * @return {@link ReportManager} |
| */ |
| public ReportManager build() { |
| Preconditions.checkNotNull(stateContext); |
| return new ReportManager(stateContext, reportPublishers); |
| } |
| |
| } |
| } |