| /** |
| * 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.metrics2.sink; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.File; |
| import java.io.FileWriter; |
| import java.io.PrintWriter; |
| |
| import org.apache.commons.configuration.SubsetConfiguration; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.metrics2.AbstractMetric; |
| import org.apache.hadoop.metrics2.MetricsException; |
| import org.apache.hadoop.metrics2.MetricsRecord; |
| import org.apache.hadoop.metrics2.MetricsSink; |
| import org.apache.hadoop.metrics2.MetricsTag; |
| |
| /** |
| * A metrics sink that writes to a file |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class FileSink implements MetricsSink { |
| private static final String FILENAME_KEY = "filename"; |
| private PrintWriter writer; |
| |
| @Override |
| public void init(SubsetConfiguration conf) { |
| String filename = conf.getString(FILENAME_KEY); |
| try { |
| writer = filename == null |
| ? new PrintWriter(System.out) |
| : new PrintWriter(new FileWriter(new File(filename), true)); |
| } |
| catch (Exception e) { |
| throw new MetricsException("Error creating "+ filename, e); |
| } |
| } |
| |
| @Override |
| public void putMetrics(MetricsRecord record) { |
| writer.print(record.timestamp()); |
| writer.print(" "); |
| writer.print(record.context()); |
| writer.print("."); |
| writer.print(record.name()); |
| String separator = ": "; |
| for (MetricsTag tag : record.tags()) { |
| writer.print(separator); |
| separator = ", "; |
| writer.print(tag.name()); |
| writer.print("="); |
| writer.print(tag.value()); |
| } |
| for (AbstractMetric metric : record.metrics()) { |
| writer.print(separator); |
| separator = ", "; |
| writer.print(metric.name()); |
| writer.print("="); |
| writer.print(metric.value()); |
| } |
| writer.println(); |
| } |
| |
| @Override |
| public void flush() { |
| writer.flush(); |
| } |
| } |