hadoop JobHistoryParserFactory 源码
haddop JobHistoryParserFactory 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/JobHistoryParserFactory.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.IOException;
import java.io.InputStream;
/**
* {@link JobHistoryParserFactory} is a singleton class that attempts to
* determine the version of job history and return a proper parser.
*/
public class JobHistoryParserFactory {
public static JobHistoryParser getParser(RewindableInputStream ris)
throws IOException {
for (VersionDetector vd : VersionDetector.values()) {
boolean canParse = vd.canParse(ris);
ris.rewind();
if (canParse) {
return vd.newInstance(ris);
}
}
throw new IOException("No suitable parser.");
}
public enum VersionDetector {
Hadoop20() {
@Override
public boolean canParse(InputStream input) throws IOException {
return Hadoop20JHParser.canParse(input);
}
@Override
public JobHistoryParser newInstance(InputStream input) throws IOException {
return new Hadoop20JHParser(input);
}
},
Current() {
@Override
public boolean canParse(InputStream input) throws IOException {
return CurrentJHParser.canParse(input);
}
@Override
public JobHistoryParser newInstance(InputStream input) throws IOException {
return new CurrentJHParser(input);
}
};
abstract JobHistoryParser newInstance(InputStream input) throws IOException;
abstract boolean canParse(InputStream input) throws IOException;
}
}
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