ToyApp.java

/*
 * Copyright © 2014-2016 Cask Data, Inc.
 *
 * Licensed 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 co.cask.cdap;

import co.cask.cdap.api.annotation.Output;
import co.cask.cdap.api.annotation.ProcessInput;
import co.cask.cdap.api.annotation.UseDataSet;
import co.cask.cdap.api.app.AbstractApplication;
import co.cask.cdap.api.data.stream.Stream;
import co.cask.cdap.api.dataset.lib.KeyValueTable;
import co.cask.cdap.api.flow.AbstractFlow;
import co.cask.cdap.api.flow.flowlet.AbstractFlowlet;
import co.cask.cdap.api.flow.flowlet.OutputEmitter;
import co.cask.cdap.api.flow.flowlet.StreamEvent;
import com.google.common.collect.Lists;

import java.net.URI;
import java.util.List;

/**
 * This is a Toy Application used for only testing.
 */
public class ToyApp extends AbstractApplication {
  @Override
  public void configure() {
    setName("ToyApp");
    setDescription("Toy Flow Application");
    addStream(new Stream("X"));
    addStream(new Stream("Y"));
    createDataset("data1", KeyValueTable.class);
    addFlow(new ToyFlow());
  }

  /**
   *
   */
  public static final class ToyFlow extends AbstractFlow {

    @Override
    protected void configureFlow() {
      setName("ToyFlow");
      setDescription("Complex Toy Flow");
      addFlowlet(new A());
      addFlowlet(new B());
      addFlowlet(new C());
      addFlowlet(new D());
      addFlowlet(new E());
      addFlowlet(new F());
      addFlowlet(new G());
      connectStream("X", "A");
      connectStream("Y", "B");
      connect("A", "C");
      connect("B", "E");
      connect("A", "E");
      connect("C", "D");
      connect("C", "F");
      connect("D", "G");
      connect("F", "G");
      connect("E", "G");
    }
  }

  /**
   *
   */
  public static final class A extends AbstractFlowlet {
    @UseDataSet("data1")
    private KeyValueTable myDataSet;

    private OutputEmitter<String> out;
    @Output("out1")
    private OutputEmitter<Float> out1;

    @Override
    public void configure() {
      setName("A");
      setDescription("A flowlet");
    }

    @ProcessInput
    public void process(StreamEvent event) {
      KeyValueTable table = getContext().getDataset("data2");
      out.emit("out");
      out1.emit(2.3f);
    }
  }

  /**
   *
   */
  public static final class B extends AbstractFlowlet {
    private OutputEmitter<Boolean> out;

    @ProcessInput
    public void process(StreamEvent event) {
      out.emit(false);
    }

    @Override
    protected void configure() {
      setName("B");
    }
  }

  /**
   *
   */
  public static final class C extends AbstractFlowlet {
    @Output("c1")
    private OutputEmitter<Long> c1;

    @Output("c2")
    private OutputEmitter<Integer> c2;

    @ProcessInput
    public void process(String a) {
      c1.emit(1L);
      c2.emit(1);
    }

    @Override
    protected void configure() {
      setName("C");
    }
  }

  /**
   *
   */
  public static final class E extends AbstractFlowlet {
    private OutputEmitter<Double> out;

    @ProcessInput("out1")
    void process(Float f) {
      out.emit(1.2);
    }

    @ProcessInput
    void process(Boolean b) {
      out.emit(1.5);
    }

    @Override
    protected void configure() {
      setName("E");
    }
  }

  /**
   *
   */
  public static final class D extends AbstractFlowlet {
    @Output("d1")
    private OutputEmitter<List<String>> out;

    @ProcessInput("c1")
    void process(Long l) {
      List<String> p = Lists.newArrayList();
      out.emit(p);
    }

    @Override
    protected void configure() {
      setName("D");
    }
  }

  /**
   *
   */
  public static final class F extends AbstractFlowlet {
    @Output("f1")
    private OutputEmitter<URI> f1;

    @ProcessInput("c2")
    void process(Integer i) {
      f1.emit(URI.create("http://www.google.com"));
    }

    @Override
    protected void configure() {
      setName("F");
    }
  }

  /**
   *
   */
  public static final class G extends AbstractFlowlet {

    @ProcessInput("d1")
    public void process(List<String> s) {

    }

    @ProcessInput("f1")
    public void process(URI uri) {

    }

    @ProcessInput
    public void process(Double d) {

    }

    @Override
    protected void configure() {
      setName("G");
    }
  }
}