IntroductoryExample.java

package com.linkedin.parseq.example.introduction;

import com.linkedin.parseq.Engine;
import com.linkedin.parseq.Task;
import com.linkedin.parseq.example.common.AbstractExample;
import com.linkedin.parseq.example.common.ExampleUtil;
import com.linkedin.parseq.httpclient.HttpClient;


/**
 * @author Jaroslaw Odzga (jodzga@linkedin.com)
 */
public class IntroductoryExample extends AbstractExample {
  public static void main(String[] args) throws Exception {
    new IntroductoryExample().runExample();
    HttpClient.close();
  }

  private Task<String> fetchBody(String url) {
    return HttpClient.get(url).task()
        .map("getBody", response -> response.getResponseBody());
  }

  @Override
  protected void doRunExample(final Engine engine) throws Exception {

    final Task<String> google = fetchBody("http://www.google.com");
    final Task<String> yahoo = fetchBody("http://www.yahoo.com");
    final Task<String> bing = fetchBody("http://www.bing.com");

//    final Task<String> plan = Task.par(google, yahoo, bing)
//        .map((g, y, b) -> "Google Page: " + g +" \n" +
//                          "Yahoo Page: " + y + "\n" +
//                          "Bing Page: " + b + "\n")
//        .andThen(System.out::println);

    final Task<Integer> sumLengths =
        Task.par(google.map("length", s -> s.length()),
                 yahoo.map("length", s -> s.length()),
                 bing.map("length",s -> s.length()))
             .map("sum", (g, y, b) -> g + y + b);

    engine.run(sumLengths);

    sumLengths.await();

    ExampleUtil.printTracingResults(sumLengths);
  }
}