| /** |
| * 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 com.datatorrent.lib.testbench; |
| |
| import java.util.Random; |
| |
| import javax.validation.constraints.Min; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.InputOperator; |
| |
| /** |
| * This is an input operator which generates random tuples that are an array of bytes. |
| * @category Test Bench |
| * @since 2.0.0 |
| */ |
| public class RandomWordGenerator implements InputOperator |
| { |
| /** |
| * The output port on which byte arrays are emitted. |
| */ |
| public final transient DefaultOutputPort<byte[]> output = new DefaultOutputPort<byte[]>(); |
| |
| /** |
| * The default number of tuples emitted per window. |
| */ |
| public static final int MAX_TUPLES_PER_WINDOW = 200000; |
| |
| /** |
| * The size of tuples in bytes. |
| */ |
| public static final int TUPLE_BYTE_SIZE = 32; |
| |
| /** |
| * The number of tuples per window. |
| */ |
| @Min(1) |
| private int tuplesPerWindow = MAX_TUPLES_PER_WINDOW; |
| |
| /** |
| * The size of tuples in bytes. |
| */ |
| @Min(1) |
| private int tupleSize = TUPLE_BYTE_SIZE; |
| |
| /** |
| * The random object use to generate the tuples. |
| */ |
| private transient Random random = new Random(); |
| |
| /** |
| * A counter which is used to emit the same number of tuples per |
| * application window. |
| */ |
| private int tupleCounter = 0; |
| |
| public RandomWordGenerator() |
| { |
| } |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| } |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| tupleCounter = 0; |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| for (; tupleCounter < tuplesPerWindow; tupleCounter++) { |
| byte[] bytes = new byte[tupleSize]; |
| random.nextBytes(bytes); |
| output.emit(bytes); |
| } |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| } |
| |
| @Override |
| public void teardown() |
| { |
| } |
| |
| /** |
| * Sets the number of tuples emitted per application window. |
| * @param tuplesPerWindow The number of tuples emitted per application window. |
| */ |
| public void setTuplesPerWindow(int tuplesPerWindow) |
| { |
| this.tuplesPerWindow = tuplesPerWindow; |
| } |
| |
| /** |
| * Gets the number of tuples emitted per application window. |
| * @return The number of tuples emitted per application window. |
| */ |
| public int getTuplesPerWindow() |
| { |
| return tuplesPerWindow; |
| } |
| |
| /** |
| * Sets the number of bytes in the emitted byte array tuples. |
| * @param tupleSize The number of bytes in the emitted byte array tuples. |
| */ |
| public void setTupleSize(int tupleSize) |
| { |
| this.tupleSize = tupleSize; |
| } |
| |
| /** |
| * Gets the number of bytes in the emitted byte array tuples. |
| * @return The number of bytes in the emitted byte array tuples. |
| */ |
| public int getTupleSize() |
| { |
| return tupleSize; |
| } |
| } |