[Spring Batch] CommandlineJobRunner 병렬 실행 TestCase

CommandlineJobRunner 을 이용해서 동작하는 클래스가 여러개의 쓰레드에서 동작했을 때 문제 없는지 확인하는 TestCase이다.
ExecutorService 를 이용해서 개발된 코드이다. 동시에 몇개의 쓰레드를 동시에 시작시키고 이런 iteration을 몇개나 할 수 있는지, 예상해서 개발이 가능하다.

/*
 * Copyright 2006-2007 the original author or authors.
 *
 * 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,
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 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.sample.batch.example;

import static org.junit.Assert.assertNotNull;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobParameter;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author Dave Syer
 *
 */
@ContextConfiguration(locations = { "/launch-context.xml" })
@RunWith(SpringJUnit4ClassRunner.class)
public class ExampleJobConfigurationTests {

 @Autowired
 private JobLauncher jobLauncher;

 @Autowired
 private Job job;

 private int seq = new Random().nextInt();

 @Test
 public void testSimpleProperties() throws Exception {
  assertNotNull(jobLauncher);
 }

 @Test
 public void testLaunchJob() throws Exception {
  ExecutorService service = Executors.newFixedThreadPool(5);
  for (int i = 1; i < 100; i++) {
   service.execute(new SimpleJob());
  }
  service.shutdown();
  try {
   while (!service.awaitTermination(2000, TimeUnit.MILLISECONDS)) {
   }
  } catch (InterruptedException e) {
   e.printStackTrace();
  }

 }

 public String getSeq() {
  return String.valueOf(seq++);
 }

 class SimpleJob implements Runnable {

  @Override
  public void run() {
   try {
    Map<String, JobParameter> parameters = new HashMap<String, JobParameter>();
    parameters.put("job_mssql", new JobParameter("job_mssql"));
    System.out.println("## seq: " + getSeq());
    parameters.put("seq", new JobParameter(getSeq()));
    JobParameters jobParameters = new JobParameters(parameters);
    jobLauncher.run(job, jobParameters);
   } catch (Exception e) {
    e.printStackTrace();
   }
  }

 }

}