| /** |
| * 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.fs.slive; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Random; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.slive.OperationOutput.OutputType; |
| |
| /** |
| * An operation provides these abstractions and if it desires to perform any |
| * operations it must implement a override of the run() function to provide |
| * varying output to be captured. |
| */ |
| abstract class Operation { |
| |
| private ConfigExtractor config; |
| private PathFinder finder; |
| private String type; |
| private Random rnd; |
| |
| protected Operation(String type, ConfigExtractor cfg, Random rnd) { |
| this.config = cfg; |
| this.type = type; |
| this.rnd = rnd; |
| // Use a new Random instance so that the sequence of file names produced is |
| // the same even in case of unsuccessful operations |
| this.finder = new PathFinder(cfg, new Random(rnd.nextInt())); |
| } |
| |
| /** |
| * Gets the configuration object this class is using |
| * |
| * @return ConfigExtractor |
| */ |
| protected ConfigExtractor getConfig() { |
| return this.config; |
| } |
| |
| /** |
| * Gets the random number generator to use for this operation |
| * |
| * @return Random |
| */ |
| protected Random getRandom() { |
| return this.rnd; |
| } |
| |
| /** |
| * Gets the type of operation that this class belongs to |
| * |
| * @return String |
| */ |
| String getType() { |
| return type; |
| } |
| |
| /** |
| * Gets the path finding/generating instance that this class is using |
| * |
| * @return PathFinder |
| */ |
| protected PathFinder getFinder() { |
| return this.finder; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() { |
| return getType(); |
| } |
| |
| /** |
| * This run() method simply sets up the default output container and adds in a |
| * data member to keep track of the number of operations that occurred |
| * |
| * @param fs |
| * FileSystem object to perform operations with |
| * |
| * @return List of operation outputs to be collected and output in the overall |
| * map reduce operation (or empty or null if none) |
| */ |
| List<OperationOutput> run(FileSystem fs) { |
| List<OperationOutput> out = new LinkedList<OperationOutput>(); |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.OP_COUNT, 1L)); |
| return out; |
| } |
| |
| } |