| /** |
| * 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 {@link JobHistory} files produced by |
| * {@link org.apache.hadoop.mapreduce.jobhistory.JobHistory} in the same source |
| * code tree as rumen. |
| */ |
| 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(); |
| } |
| |
| } |