/*
    * 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.commons.jxpath.ri;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import org.apache.commons.jxpath.JXPathContext;
  import org.junit.jupiter.api.Test;
  
  /**
   * Test thread safety.
   */
  public class StressTest {
  
      private static final class StressRunnable implements Runnable {
  
          @Override
          public void run() {
              for (int j = 0; j < THREAD_DURATION && exception == null; j++) {
                  try {
                      final double random = 1 + Math.random();
                      final double sum = ((Double) context.getValue("/ + " + random)).doubleValue();
                      assertEquals(0.0001, sum, 100 + random);
                      synchronized (context) {
                          count++;
                      }
                  } catch (final Throwable t) {
                      exception = t;
                  }
              }
          }
      }
  
      private static final int THREAD_COUNT = 50;
      private static final int THREAD_DURATION = 1000;
      private static JXPathContext context;
      private static int count;
      private static Throwable exception;
  
      @Test
      public void testThreads() throws Throwable {
          context = JXPathContext.newContext(null, Double.valueOf(100));
          final Thread[] threadArray = new Thread[THREAD_COUNT];
          for (int i = 0; i < THREAD_COUNT; i++) {
              threadArray[i] = new Thread(new StressRunnable());
          }
          for (final Thread element : threadArray) {
              element.start();
          }
          for (final Thread element : threadArray) {
              try {
                  element.join();
              } catch (final InterruptedException e) {
                  fail("Interrupted");
              }
          }
          if (exception != null) {
              throw exception;
          }
          assertEquals(THREAD_COUNT * THREAD_DURATION, count, "Test count");
      }
  }