| /* |
| * 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.storm.pmml; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.storm.pmml.model.ModelOutputs; |
| import org.apache.storm.pmml.runner.ModelRunner; |
| import org.apache.storm.pmml.runner.ModelRunnerFactory; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.base.BaseRichBolt; |
| import org.apache.storm.topology.base.BaseTickTupleAwareRichBolt; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.utils.TupleUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @SuppressWarnings("checkstyle:AbbreviationAsWordInName") |
| public class PMMLPredictorBolt extends BaseTickTupleAwareRichBolt { |
| protected static final Logger LOG = LoggerFactory.getLogger(PMMLPredictorBolt.class); |
| |
| private final ModelOutputs outputs; |
| private final ModelRunnerFactory runnerFactory; |
| private ModelRunner runner; |
| private OutputCollector collector; |
| |
| /* |
| * Passing a factory rather than the actual object to avoid enforcing the strong |
| * requirement of having to have ModelRunner to be Serializable |
| */ |
| |
| /** |
| * Creates an instance of {@link PMMLPredictorBolt} that executes, for every tuple, the runner constructed with |
| * the {@link ModelRunnerFactory} specified in the parameter |
| * The {@link PMMLPredictorBolt} instantiated with this constructor declares the output fields as specified |
| * by the {@link ModelOutputs} parameter. |
| */ |
| public PMMLPredictorBolt(ModelRunnerFactory modelRunnerFactory, ModelOutputs modelOutputs) { |
| this.outputs = modelOutputs; |
| this.runnerFactory = modelRunnerFactory; |
| LOG.info("Instantiated {}", this); |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) { |
| this.runner = runnerFactory.newModelRunner(); |
| this.collector = collector; |
| } |
| |
| @Override |
| protected void process(Tuple input) { |
| try { |
| final Map<String, List<Object>> scoresPerStream = runner.scoredTuplePerStream(input); |
| LOG.debug("Input tuple [{}] generated predicted scores [{}]", input, scoresPerStream); |
| if (scoresPerStream != null) { |
| for (Map.Entry<String, List<Object>> streamToTuple : scoresPerStream.entrySet()) { |
| collector.emit(streamToTuple.getKey(), input, streamToTuple.getValue()); |
| } |
| collector.ack(input); |
| } else { |
| LOG.debug("Input tuple [{}] generated NULL scores", input); |
| } |
| } catch (Exception e) { |
| collector.reportError(e); |
| collector.fail(input); |
| } |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| LOG.info("Declaring output fields [{}]", outputs); |
| for (Map.Entry<String, ? extends Fields> streamToFields : outputs.streamFields().entrySet()) { |
| declarer.declareStream(streamToFields.getKey(), streamToFields.getValue()); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "PMMLPredictorBolt{" |
| + "outputFields=" + outputs |
| + ", runnerFactory=" + runnerFactory.getClass().getName() |
| + ", runner=" + runner |
| + ", collector=" + collector |
| + "} "; |
| } |
| } |