/**
* 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.ambari.log4j.hadoop.mapreduce.jobhistory;
import java.io.IOException;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.ambari.log4j.common.LogParser;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.tools.rumen.Hadoop20JHParser;
import org.apache.hadoop.tools.rumen.JobHistoryParser;
import org.apache.hadoop.util.LineReader;
import org.apache.log4j.spi.LoggingEvent;
public class MapReduceJobHistoryParser implements LogParser {
private JobHistoryParser parser;
private LogLineReader reader = new LogLineReader("Meta VERSION=\"1\" .");
public MapReduceJobHistoryParser() {
try {
parser = new Hadoop20JHParser(reader);
} catch (IOException ioe) {
// SHOULD NEVER HAPPEN!
throw new RuntimeException(ioe);
}
}
@Override
public void addEventToParse(LoggingEvent event) {
reader.addLine(event.getMessage().toString());
}
@Override
public Object getParseResult() throws IOException {
return parser.nextEvent();
}
static class LogLineReader extends LineReader {
private Queue<String> lines = new LinkedBlockingQueue<String>();
public LogLineReader(String line) {
super(null);
addLine(line);
}
private void addLine(String line) {
lines.add(line);
}
public int readLine(Text str) throws IOException {
String line = lines.poll();
if (line != null) {
str.set(line);
return line.length();
}
return 0;
}
public void close() throws IOException {
}
}
}