| /** |
| * 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.storm.metric; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.storm.metric.api.IMetricsConsumer; |
| import org.apache.storm.task.IErrorReporter; |
| import org.apache.storm.task.TopologyContext; |
| |
| /** |
| * Listens for all metrics, dumps them to log |
| * |
| * To use, add this to your topology's configuration: |
| * |
| * ```java |
| * conf.registerMetricsConsumer(org.apache.storm.metrics.LoggingMetricsConsumer.class, 1); |
| * ``` |
| * |
| * Or edit the storm.yaml config file: |
| * |
| * ```yaml |
| * topology.metrics.consumer.register: |
| * - class: "org.apache.storm.metrics.LoggingMetricsConsumer" |
| * parallelism.hint: 1 |
| * ``` |
| * |
| */ |
| public class LoggingMetricsConsumer implements IMetricsConsumer { |
| public static final Logger LOG = LoggerFactory.getLogger(LoggingMetricsConsumer.class); |
| |
| @Override |
| public void prepare(Map stormConf, Object registrationArgument, TopologyContext context, IErrorReporter errorReporter) { } |
| |
| static private String padding = " "; |
| |
| @Override |
| public void handleDataPoints(TaskInfo taskInfo, Collection<DataPoint> dataPoints) { |
| StringBuilder sb = new StringBuilder(); |
| String header = String.format("%d\t%15s:%-4d\t%3d:%-11s\t", |
| taskInfo.timestamp, |
| taskInfo.srcWorkerHost, taskInfo.srcWorkerPort, |
| taskInfo.srcTaskId, |
| taskInfo.srcComponentId); |
| sb.append(header); |
| for (DataPoint p : dataPoints) { |
| sb.delete(header.length(), sb.length()); |
| sb.append(p.name) |
| .append(padding).delete(header.length()+23,sb.length()).append("\t") |
| .append(p.value); |
| LOG.info(sb.toString()); |
| } |
| } |
| |
| @Override |
| public void cleanup() { } |
| } |