/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.handlers.text.output;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import org.apache.commons.lang.StringEscapeUtils;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.handlers.text.FormatFactory.OutputFormatBuilder;
import com.cloudera.util.DateUtils;
import com.google.common.base.Preconditions;
/**
* This will support a subset of the log4j pattern escape characters
*
* Out of the box, cloudera hadoop uses the pattern for hadoop logs:
* "%d{ISO8601} %p %c: %m%n"
*
* %d is the date in ISO8601 format. ( http://en.wikipedia.org/wiki/ISO_8601 )
*
* %p is the priority
*
* %c is the category of the logging event.
*
* %m is the message body
*
* %n is a platform specific new line character (\n\r or \n)
*
* TODO (jon) support log4j's escape patterns
*/
public class Log4jOutputFormat extends AbstractOutputFormat {
private static final String NAME = "log4j";
private String format(Event e) {
Date d = new Date(e.getTimestamp());
String data = String.format("%s %s %s: %s\n", DateUtils.asISO8601(d),
e.getPriority(), "log4j", StringEscapeUtils.escapeJava(new String(e
.getBody())));
return data;
}
@Override
public void format(OutputStream o, Event e) throws IOException {
o.write(format(e).getBytes());
}
public static OutputFormatBuilder builder() {
return new OutputFormatBuilder() {
@Override
public OutputFormat build(String... args) {
Preconditions.checkArgument(args.length <= 0, "usage: hadooplog4j");
OutputFormat format = new Log4jOutputFormat();
format.setBuilder(this);
return format;
}
@Override
public String getName() {
return NAME;
}
};
}
}