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
   *
   * https://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.avro.util;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This test aims to stress WeakIdentityHashMap class in multithread env.
   */
  class WeakIdentityHashMapTest {
  
    private static final int TEST_SIZE = 4001;
  
    List<String> data = new ArrayList<>(TEST_SIZE);
  
    final WeakIdentityHashMap<String, String> map = new WeakIdentityHashMap<>();
  
    List<RuntimeException> exceptions = new ArrayList<>(TEST_SIZE);
  
    @Test
    void stressMap() {
  
      for (int i = 1; i <= TEST_SIZE; i++) {
        data.add("Data_" + i);
      }
  
      List<Thread> threads = new ArrayList<>(80);
      for (int i = 0; i <= 80; i++) {
        final int seed = (i + 1) * 100;
        Runnable runnable = () -> rundata(seed);
        Thread t = new Thread(runnable);
        threads.add(t);
      }
      threads.forEach(Thread::start);
      threads.forEach((Thread t) -> {
        try {
          t.join();
        } catch (InterruptedException e) {
          throw new RuntimeException(e);
        }
      });
      Assertions.assertTrue(exceptions.isEmpty());
    }
  
    void rundata(int seed) {
      try {
        for (int i = 1; i <= TEST_SIZE; i++) {
          String keyValue = data.get((i + seed) % TEST_SIZE);
          map.put(keyValue, keyValue);
          if (i % 200 == 0) {
            sleep();
          }
          String keyValueRemove = data.get(((i + seed) * 3) % TEST_SIZE);
          map.remove(keyValueRemove);
        }
      } catch (RuntimeException ex) {
        exceptions.add(ex);
      }
    }
  
    void sleep() {
      try {
        Thread.sleep(5);
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
      }
    }
  
  }
  