content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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 org.apache.bookkeeper.slogger;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Optional;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import org.junit.Test;
  
  /**
   * Test concurrent access to slogger.
   */
  public class ConcurrencyTest {
      enum Events {
          FOOBAR
      }
  
      @Test
      public void testConcurrentFlattening() throws Exception {
          final int numThreads = 100;
          final int numIterations = 10000;
  
          Slogger slog = new AbstractSlogger(Collections.emptyList()) {
                  @Override
                  public Slogger newSlogger(Optional<Class<?>> clazz, Iterable<Object> parent) {
                      return this;
                  }
                  @Override
                  public void doLog(Level level, Enum<?> event, String message,
                                    Throwable throwable, List<Object> keyValues) {
                      for (int i = 0; i < keyValues.size(); i += 2) {
                          if (!keyValues.get(i).equals(keyValues.get(i + 1))) {
  
                              throw new RuntimeException("Concurrency error");
                          }
                      }
                  }
              };
  
          ExecutorService executor = Executors.newFixedThreadPool(numThreads);
          List<Future<?>> futures = new ArrayList<>();
          for (int i = 0; i < numThreads; i++) {
              futures.add(executor.submit(() -> {
                          for (int j = 0; j < numIterations; j++) {
                              String value = "kv" + Thread.currentThread().getId() + "-" + j;
  
                              slog.kv(value, value).info(Events.FOOBAR);
                          }
                      }));
          }
  
          for (Future<?> f : futures) {
              f.get(60, TimeUnit.SECONDS);
          }
      }
  }
  