hadoop CurrentJHParser 源码
haddop CurrentJHParser 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/CurrentJHParser.java
/**
* 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.tools.rumen;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.mapreduce.jobhistory.EventReader;
import org.apache.hadoop.mapreduce.jobhistory.HistoryEvent;
import org.apache.hadoop.mapreduce.v2.hs.JobHistory;
/**
* {@link JobHistoryParser} that parses JobHistory files.
*/
public class CurrentJHParser implements JobHistoryParser {
private EventReader reader;
private static class ForkedDataInputStream extends DataInputStream {
ForkedDataInputStream(InputStream input) {
super(input);
}
@Override
public void close() {
// no code
}
}
/**
* Can this parser parse the input?
*
* @param input
* @return Whether this parser can parse the input.
* @throws IOException
*/
public static boolean canParse(InputStream input) throws IOException {
final DataInputStream in = new ForkedDataInputStream(input);
try {
final EventReader reader = new EventReader(in);
try {
reader.getNextEvent();
} catch (IOException e) {
return false;
} finally {
reader.close();
}
} catch (IOException e) {
return false;
}
return true;
}
public CurrentJHParser(InputStream input) throws IOException {
reader = new EventReader(new DataInputStream(input));
}
@Override
public HistoryEvent nextEvent() throws IOException {
return reader.getNextEvent();
}
@Override
public void close() throws IOException {
reader.close();
}
}
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