| /** |
| * 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.apex.examples.throttle; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.InputOperator; |
| import com.datatorrent.common.util.BaseOperator; |
| |
| /** |
| * This is a simple operator that emits random number. |
| * |
| * @since 3.7.0 |
| */ |
| public class RandomNumberGenerator extends BaseOperator implements InputOperator |
| { |
| private int numTuples = 1000; |
| private int origNumTuples = numTuples; |
| private transient int count = 0; |
| |
| private static final Logger logger = LoggerFactory.getLogger(RandomNumberGenerator.class); |
| |
| public final transient DefaultOutputPort<Double> out = new DefaultOutputPort<Double>(); |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| count = 0; |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| if (count++ < numTuples) { |
| out.emit(Math.random()); |
| } |
| } |
| |
| // Simple suspend and |
| public void suspend() |
| { |
| logger.debug("Slowing down"); |
| numTuples = 0; |
| } |
| |
| public void normal() |
| { |
| logger.debug("Normal"); |
| numTuples = origNumTuples; |
| } |
| |
| public int getNumTuples() |
| { |
| return numTuples; |
| } |
| |
| /** |
| * Sets the number of tuples to be emitted every window. |
| * @param numTuples number of tuples |
| */ |
| public void setNumTuples(int numTuples) |
| { |
| this.numTuples = numTuples; |
| this.origNumTuples = numTuples; |
| } |
| } |