Application.java

/*
 * Copyright 2017 Red Hat, Inc.
 *
 * Red Hat 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 io.vertx.example.spring.worker;

import io.vertx.core.DeploymentOptions;
import io.vertx.core.Vertx;
import io.vertx.core.VertxOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.event.EventListener;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;

import static java.util.concurrent.TimeUnit.*;

/**
 * @author Thomas Segismont
 */
@SpringBootApplication
public class Application {
  private static final Logger LOG = LoggerFactory.getLogger(Application.class);

  @Autowired
  SpringVerticleFactory verticleFactory;

  /**
   * The Vert.x worker pool size, configured in the {@code application.properties} file.
   *
   * Make sure this is greater than {@link #springWorkerInstances}.
   */
  @Value("${vertx.worker.pool.size}")
  int workerPoolSize;

  /**
   * The number of {@link SpringWorker} instances to deploy, configured in the {@code application.properties} file.
   */
  @Value("${vertx.springWorker.instances}")
  int springWorkerInstances;

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }

  /**
   * Deploy verticles when the Spring application is ready.
   */
  @EventListener
  public void deployVerticles(ApplicationReadyEvent event) {
    Vertx vertx = Vertx.vertx(new VertxOptions().setWorkerPoolSize(workerPoolSize));

    // The verticle factory is registered manually because it is created by the Spring container
    vertx.registerVerticleFactory(verticleFactory);

    CountDownLatch deployLatch = new CountDownLatch(2);
    AtomicBoolean failed = new AtomicBoolean(false);

    String restApiVerticleName = verticleFactory.prefix() + ":" + BookRestApi.class.getName();
    vertx.deployVerticle(restApiVerticleName, ar -> {
      if (ar.failed()) {
        LOG.error("Failed to deploy verticle", ar.cause());
        failed.compareAndSet(false, true);
      }
      deployLatch.countDown();
    });

    DeploymentOptions workerDeploymentOptions = new DeploymentOptions()
      .setWorker(true)
      // As worker verticles are never executed concurrently by Vert.x by more than one thread,
      // deploy multiple instances to avoid serializing requests.
      .setInstances(springWorkerInstances);
    String workerVerticleName = verticleFactory.prefix() + ":" + SpringWorker.class.getName();
    vertx.deployVerticle(workerVerticleName, workerDeploymentOptions, ar -> {
      if (ar.failed()) {
        LOG.error("Failed to deploy verticle", ar.cause());
        failed.compareAndSet(false, true);
      }
      deployLatch.countDown();
    });

    try {
      if (!deployLatch.await(5, SECONDS)) {
        throw new RuntimeException("Timeout waiting for verticle deployments");
      } else if (failed.get()) {
        throw new RuntimeException("Failure while deploying verticles");
      }
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }
  }

}