code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2011 Daniel Naber (http://www.danielnaber.de)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.server;
  
  import org.junit.Test;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Test HTTP server access from multiple threads.
   */
  public class HTTPServerLoadTest extends HTTPServerTest {
  
    // we keep these numbers low so the tests stay fast - increase them for serious testing:
    private static final int REPEAT_COUNT = 1;
    private static final int THREAD_COUNT = 2;
  
    private final AtomicInteger runningTests = new AtomicInteger();
  
    @Test
    @Override
    public void testHTTPServer() throws Exception {
      long startTime = System.currentTimeMillis();
      HTTPServerConfig config = new HTTPServerConfig(HTTPTestTools.getDefaultPort(), true);
      HTTPServer server = new HTTPServer(config);
      assertFalse(server.isRunning());
      try {
        server.run();
        assertTrue(server.isRunning());
        doTest();
      } finally {
        server.stop();
        assertFalse(server.isRunning());
        long runtime = System.currentTimeMillis() - startTime;
        System.out.println("Running with " + getThreadCount() + " threads in " + runtime + "ms");
      }
    }
  
    void doTest() throws InterruptedException, ExecutionException {
      ExecutorService executorService = Executors.newFixedThreadPool(getThreadCount());
      List<Future<?>> futures = new ArrayList<>();
      System.out.println("thread count: " + getThreadCount());
      for (int i = 0; i < getThreadCount(); i++) {
        Future<?> future = executorService.submit(new TestRunnable());
        futures.add(future);
      }
      for (Future<?> future : futures) {
        future.get();
      }
    }
  
    protected int getThreadCount() {
      return THREAD_COUNT;
    }
  
    protected int getRepeatCount() {
      return REPEAT_COUNT;
    }
  
    @Override
    public void testAccessDenied() {
      // no need to test this here, tested in super class
    }
    
    private class TestRunnable implements Runnable {
      @Override
      public void run() {
        for (int i = 0; i < getRepeatCount(); i++) {
          runningTests.incrementAndGet();
          try {
            runTestsV2();
          } catch (Exception e) {
            throw new RuntimeException(e);
          } finally {
            runningTests.decrementAndGet();
            //int count = runningTests.decrementAndGet();
            //System.out.println("Tests currently running: " + count);
          }
        }
      }
    }
    
  }
  