streampipes-pipeline-elements-examples-processors-jvm/src/main/java/org/apache/streampipes/pe/examples/jvm/staticproperty/CompactRuntimeResolvableSingleValueProcessor.java

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 * 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
 *
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.streampipes.pe.examples.jvm.staticproperty;

import org.apache.commons.collections.MapUtils;
import org.apache.streampipes.commons.exceptions.SpRuntimeException;
import org.apache.streampipes.container.api.ResolvesContainerProvidedOptions;
import org.apache.streampipes.model.graph.DataProcessorDescription;
import org.apache.streampipes.model.runtime.Event;
import org.apache.streampipes.model.staticproperty.Option;
import org.apache.streampipes.sdk.builder.ProcessingElementBuilder;
import org.apache.streampipes.sdk.builder.StreamRequirementsBuilder;
import org.apache.streampipes.sdk.extractor.StaticPropertyExtractor;
import org.apache.streampipes.sdk.helpers.*;
import org.apache.streampipes.wrapper.context.EventProcessorRuntimeContext;
import org.apache.streampipes.wrapper.routing.SpOutputCollector;
import org.apache.streampipes.wrapper.standalone.ProcessorParams;
import org.apache.streampipes.wrapper.standalone.StreamPipesDataProcessor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;
import java.util.List;

public class CompactRuntimeResolvableSingleValueProcessor extends StreamPipesDataProcessor implements ResolvesContainerProvidedOptions {

  private static final String KafkaHost = "kafka-host";
  private static final String KafkaPort = "kafka-port";

  private static final Logger LOG = LoggerFactory.getLogger(CompactRuntimeResolvableSingleValueProcessor.class);

  @Override
  public DataProcessorDescription declareModel() {
    return ProcessingElementBuilder.create("org.apache.streampipes.examples.staticproperty" +
                    ".compactruntimeresolvable", "Compact Runtime-resolvable single value example", "")
            .requiredStream(StreamRequirementsBuilder.
                    create()
                    .requiredProperty(EpRequirements.anyProperty())
                    .build())
            .outputStrategy(OutputStrategies.keep())
            .supportedProtocols(SupportedProtocols.kafka())
            .supportedFormats(SupportedFormats.jsonFormat())
            .requiredTextParameter(Labels.from(KafkaHost, "Kafka Host", ""))
            .requiredIntegerParameter(Labels.from(KafkaPort, "Kafka Port", ""))

            // create a single value selection parameter that is resolved at runtime
            .requiredSingleValueSelectionFromContainer(Labels.from("id", "Example Name", "Example " +
                    "Description"), Arrays.asList(KafkaHost, KafkaPort))

            .build();
  }

  @Override
  public void onInvocation(ProcessorParams parameters, SpOutputCollector spOutputCollector, EventProcessorRuntimeContext runtimeContext) throws SpRuntimeException {
    String selectedSingleValue = parameters.extractor().selectedSingleValue("id", String.class);
    LOG.info(selectedSingleValue);
  }

  @Override
  public void onEvent(Event event,
                      SpOutputCollector collector) throws SpRuntimeException {
    MapUtils.debugPrint(System.out, "event", event.getRaw());
    collector.collect(event);
  }

  @Override
  public void onDetach() throws SpRuntimeException {

  }

  @Override
  public List<Option> resolveOptions(String requestId, StaticPropertyExtractor parameterExtractor) {
    return Options.from("A", "B");
  }
}