/*
* 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.chukwa.inputtools.plugin.metrics;
import java.io.*;
import org.apache.hadoop.metrics.ContextFactory;
import org.apache.hadoop.metrics.MetricsException;
import org.apache.hadoop.metrics.spi.AbstractMetricsContext;
import org.apache.hadoop.metrics.spi.OutputRecord;
import org.apache.log4j.Logger;
public class Log4JMetricsContext extends AbstractMetricsContext {
static Logger out = Logger.getLogger(Log4JMetricsContext.class);
/* Configuration attribute names */
// protected static final String FILE_NAME_PROPERTY = "fileName";
protected static final String PERIOD_PROPERTY = "period";
/** Creates a new instance of FileContext */
public Log4JMetricsContext() {}
public void init(String contextName, ContextFactory factory) {
super.init(contextName, factory);
/*
String fileName = getAttribute(FILE_NAME_PROPERTY);
if (fileName != null) {
file = new File(fileName);
}
*/
String periodStr = getAttribute(PERIOD_PROPERTY);
if (periodStr != null) {
int period = 0;
try {
period = Integer.parseInt(periodStr);
} catch (NumberFormatException nfe) {
}
if (period <= 0) {
throw new MetricsException("Invalid period: " + periodStr);
}
setPeriod(period);
}
}
@Override
protected void emitRecord(String contextName, String recordName, OutputRecord outRec)
throws IOException
{
StringBuilder writer = new StringBuilder();
String separator = " ";
writer.append("contextName=");
writer.append(contextName);
writer.append(separator);
writer.append("recordName=");
writer.append(recordName);
writer.append(separator);
writer.append("chukwa_timestamp="+ System.currentTimeMillis());
writer.append(recordName);
for (String tagName : outRec.getTagNames()) {
writer.append(separator);
writer.append(tagName);
writer.append("=");
writer.append(outRec.getTag(tagName));
}
for (String metricName : outRec.getMetricNames()) {
writer.append(separator);
writer.append(metricName);
writer.append("=");
writer.append(outRec.getMetric(metricName));
}
out.info(writer.toString());
// out.println(writer);
}
}