| /* |
| * 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.samoa.learners.classifiers.trees; |
| |
| import org.apache.samoa.core.ContentEvent; |
| import org.apache.samoa.core.Processor; |
| import org.apache.samoa.instances.Instance; |
| import org.apache.samoa.instances.Instances; |
| import org.apache.samoa.instances.InstancesHeader; |
| import org.apache.samoa.learners.InstanceContentEvent; |
| import org.apache.samoa.learners.InstancesContentEvent; |
| import org.apache.samoa.learners.ResultContentEvent; |
| import org.apache.samoa.topology.Stream; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| /** |
| * Filter Processor that stores and filters the instances before sending them to the Model Aggregator Processor. |
| * |
| * @author Arinto Murdopo |
| * |
| */ |
| public final class FilterProcessor implements Processor { |
| |
| private static final long serialVersionUID = -1685875718300564885L; |
| private static final Logger logger = LoggerFactory.getLogger(FilterProcessor.class); |
| |
| private int processorId; |
| |
| private final Instances dataset; |
| private InstancesHeader modelContext; |
| |
| // available streams |
| private Stream outputStream; |
| |
| // private constructor based on Builder pattern |
| private FilterProcessor(Builder builder) { |
| this.dataset = builder.dataset; |
| this.batchSize = builder.batchSize; |
| this.delay = builder.delay; |
| } |
| |
| private int waitingInstances = 0; |
| |
| private int delay = 0; |
| |
| private int batchSize = 200; |
| |
| private List<InstanceContentEvent> contentEventList = new LinkedList<InstanceContentEvent>(); |
| |
| @Override |
| public boolean process(ContentEvent event) { |
| // Receive a new instance from source |
| if (event instanceof InstanceContentEvent) { |
| InstanceContentEvent instanceContentEvent = (InstanceContentEvent) event; |
| this.contentEventList.add(instanceContentEvent); |
| this.waitingInstances++; |
| if (this.waitingInstances == this.batchSize || instanceContentEvent.isLastEvent()) { |
| // Send Instances |
| InstancesContentEvent outputEvent = new InstancesContentEvent(); |
| while (!this.contentEventList.isEmpty()) { |
| InstanceContentEvent ice = this.contentEventList.remove(0); |
| outputEvent.add(ice.getInstanceContent()); |
| } |
| this.waitingInstances = 0; |
| this.outputStream.put(outputEvent); |
| if (this.delay > 0) { |
| try { |
| Thread.sleep(this.delay); |
| } catch (InterruptedException ex) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void onCreate(int id) { |
| this.processorId = id; |
| this.waitingInstances = 0; |
| |
| } |
| |
| @Override |
| public Processor newProcessor(Processor p) { |
| FilterProcessor oldProcessor = (FilterProcessor) p; |
| FilterProcessor newProcessor = |
| new FilterProcessor.Builder(oldProcessor).build(); |
| |
| newProcessor.setOutputStream(oldProcessor.outputStream); |
| return newProcessor; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(super.toString()); |
| return sb.toString(); |
| } |
| |
| void setOutputStream(Stream outputStream) { |
| this.outputStream = outputStream; |
| } |
| |
| /** |
| * Helper method to generate new ResultContentEvent based on an instance and its prediction result. |
| * |
| * @param prediction |
| * The predicted class label from the decision tree model. |
| * @param inEvent |
| * The associated instance content event |
| * @return ResultContentEvent to be sent into Evaluator PI or other destination PI. |
| */ |
| private ResultContentEvent newResultContentEvent(double[] prediction, InstanceContentEvent inEvent) { |
| ResultContentEvent rce = new ResultContentEvent(inEvent.getInstanceIndex(), inEvent.getInstance(), |
| inEvent.getClassId(), prediction, inEvent.isLastEvent(), inEvent.getArrivalTimestamp()); |
| rce.setClassifierIndex(this.processorId); |
| rce.setEvaluationIndex(inEvent.getEvaluationIndex()); |
| return rce; |
| } |
| |
| /** |
| * Builder class to replace constructors with many parameters |
| * |
| * @author Arinto Murdopo |
| * |
| */ |
| static class Builder { |
| |
| // required parameters |
| private final Instances dataset; |
| |
| private int delay = 0; |
| |
| private int batchSize = 200; |
| |
| Builder(Instances dataset) { |
| this.dataset = dataset; |
| } |
| |
| Builder(FilterProcessor oldProcessor) { |
| this.dataset = oldProcessor.dataset; |
| this.delay = oldProcessor.delay; |
| this.batchSize = oldProcessor.batchSize; |
| } |
| |
| public Builder delay(int delay) { |
| this.delay = delay; |
| return this; |
| } |
| |
| public Builder batchSize(int val) { |
| this.batchSize = val; |
| return this; |
| } |
| |
| FilterProcessor build() { |
| return new FilterProcessor(this); |
| } |
| } |
| |
| } |