hadoop AuditCommandParser 源码
haddop AuditCommandParser 代码
文件路径：/hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-workload/src/main/java/org/apache/hadoop/tools/dynamometer/workloadgenerator/audit/AuditCommandParser.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.dynamometer.workloadgenerator.audit;
import java.io.IOException;
import java.util.function.Function;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
/**
* This interface represents a pluggable command parser. It will accept in one
* line of {@link Text} input at a time and return an {@link AuditReplayCommand}
* which represents the input text. Each input line should produce exactly one
* command.
*/
public interface AuditCommandParser {
/**
* Initialize this parser with the given configuration. Guaranteed to be
* called prior to any calls to {@link #parse(Text, Function)}.
*
* @param conf The Configuration to be used to set up this parser.
* @throws IOException if error on initializing a parser.
*/
void initialize(Configuration conf) throws IOException;
/**
* Convert a line of input into an {@link AuditReplayCommand}. Since
* {@link AuditReplayCommand}s store absolute timestamps, relativeToAbsolute
* can be used to convert relative timestamps (i.e., milliseconds elapsed
* between the start of the audit log and this command) into absolute
* timestamps.
*
* @param inputLine Single input line to convert.
* @param relativeToAbsolute Function converting relative timestamps
* (in milliseconds) to absolute timestamps
* (in milliseconds).
* @return A command representing the input line.
* @throws IOException if error on parsing.
*/
AuditReplayCommand parse(Text inputLine,
Function<Long, Long> relativeToAbsolute) throws IOException;
}
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