package org.codehaus.plexus.component.manager;
   
   /*
    * Copyright 2001-2006 Codehaus Foundation.
    *
    * 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,
   * 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.
   */
  
  import org.codehaus.plexus.PlexusContainer;
  import org.codehaus.plexus.PlexusTestCase;
  
  /**
   * @author Ben Walding
   */
  public class SlowComponentClassicSingletonComponentManagerTest extends PlexusTestCase {
      public void testThreads1() throws Exception {
          test(1);
      }
  
      /**
       * Tests that multiple concurrent threads don't acquire different components.
       * @throws Exception in case of an error.
       */
      public void testThreads1000() throws Exception {
          test(1000);
      }
  
      private void test(int count) throws Exception {
          ComponentLookupThread components[] = new ComponentLookupThread[count];
          // Create them
          for (int i = 0; i < count; i++) {
              components[i] = new ComponentLookupThread(getContainer());
          }
          // Start them
          for (int i = 0; i < count; i++) {
              components[i].start();
          }
  
          // Wait for them to finish
          for (int i = 0; i < count; i++) {
              components[i].join(10000);
          }
  
          // Get master component
          SlowComponent masterComponent = lookup(SlowComponent.class);
  
          // Verify them
          for (int i = 0; i < count; i++) {
              assertSame(
                      i + ":" + components[i].getComponent() + " == " + masterComponent,
                      masterComponent,
                      components[i].getComponent());
          }
      }
  
      class ComponentLookupThread extends Thread {
          final PlexusContainer container;
  
          private SlowComponent component;
  
          public ComponentLookupThread(PlexusContainer container) {
              /*
               * NOTE: A high priority seems to increase the likelihood of exhibiting missing synchronization.
               */
              setPriority(MAX_PRIORITY);
              this.container = container;
          }
  
          public void run() {
              try {
                  //            DefaultPlexusContainer.setLookupRealm( lookupRealm );
                  SlowComponent tmpComponent = container.lookup(SlowComponent.class);
  
                  synchronized (this) {
                      this.component = tmpComponent;
                  }
              } catch (Exception e) {
                  container.getLookupRealm().display();
                  e.printStackTrace();
              }
          }
  
          public SlowComponent getComponent() {
              synchronized (this) {
                  return component;
              }
          }
      }
  }