| /** |
| * 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 java.io.IOException; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.hadoop.hdds.conf.ConfigurationSource; |
| import org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine.DatanodeStates; |
| import org.apache.hadoop.ozone.container.common.statemachine.StateContext; |
| |
| import com.google.protobuf.GeneratedMessage; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Abstract class responsible for scheduling the reports based on the |
| * configured interval. All the ReportPublishers should extend this class. |
| */ |
| public abstract class ReportPublisher<T extends GeneratedMessage> |
| implements Runnable { |
| |
| private static final Logger LOG = LoggerFactory.getLogger( |
| ReportPublisher.class); |
| |
| private ConfigurationSource config; |
| private StateContext context; |
| private ScheduledExecutorService executor; |
| |
| /** |
| * Initializes ReportPublisher with stateContext and executorService. |
| * |
| * @param stateContext Datanode state context |
| * @param executorService ScheduledExecutorService to schedule reports |
| */ |
| public void init(StateContext stateContext, |
| ScheduledExecutorService executorService) { |
| this.context = stateContext; |
| this.executor = executorService; |
| this.executor.schedule(this, |
| getReportFrequency(), TimeUnit.MILLISECONDS); |
| } |
| |
| public void setConf(ConfigurationSource conf) { |
| config = conf; |
| } |
| |
| public ConfigurationSource getConf() { |
| return config; |
| } |
| |
| @Override |
| public void run() { |
| publishReport(); |
| if (!executor.isShutdown() && |
| (context.getState() != DatanodeStates.SHUTDOWN)) { |
| executor.schedule(this, |
| getReportFrequency(), TimeUnit.MILLISECONDS); |
| } |
| } |
| |
| /** |
| * Generates and publishes the report to datanode state context. |
| */ |
| private void publishReport() { |
| try { |
| context.addReport(getReport()); |
| } catch (IOException e) { |
| LOG.error("Exception while publishing report.", e); |
| } |
| } |
| |
| /** |
| * Returns the frequency in which this particular report has to be scheduled. |
| * |
| * @return report interval in milliseconds |
| */ |
| protected abstract long getReportFrequency(); |
| |
| /** |
| * Generate and returns the report which has to be sent as part of heartbeat. |
| * |
| * @return datanode report |
| */ |
| protected abstract T getReport() throws IOException; |
| |
| /** |
| * Returns {@link StateContext}. |
| * |
| * @return stateContext report |
| */ |
| protected StateContext getContext() { |
| return context; |
| } |
| |
| } |