package org.apache.commons.jcs3.engine.memory.lru;
   
   import java.util.HashSet;
   import java.util.Map;
   import java.util.Set;
   
   import org.apache.commons.jcs3.engine.CacheElement;
   import org.apache.commons.jcs3.engine.behavior.ICacheElement;
   import org.apache.commons.jcs3.engine.control.CompositeCache;
  import org.apache.commons.jcs3.engine.control.CompositeCacheManager;
  
  /*
   * 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.
   */
  
  import junit.extensions.ActiveTestSuite;
  import junit.framework.Test;
  import junit.framework.TestCase;
  
  /**
   * Test which exercises the LRUMemory cache. This one uses three different
   * regions for three threads.
   */
  public class LRUMemoryCacheConcurrentUnitTest
      extends TestCase
  {
      /**
       * Number of items to cache, twice the configured maxObjects for the memory
       * cache regions.
       */
      private static final int items = 200;
  
      /**
       * Constructor for the TestDiskCache object.
       * <p>
       * @param testName
       */
      public LRUMemoryCacheConcurrentUnitTest( final String testName )
      {
          super( testName );
      }
  
      /**
       * A unit test suite for JUnit
       * <p>
       * @return The test suite
       */
      public static Test suite()
      {
          final ActiveTestSuite suite = new ActiveTestSuite();
  
          suite.addTest( new LRUMemoryCacheConcurrentUnitTest( "testLRUMemoryCache" )
          {
              @Override
              public void runTest()
                  throws Exception
              {
                  this.runTestForRegion( "testRegion1" );
              }
          } );
  
          return suite;
      }
  
      /**
       * Test setup
       */
      @Override
      public void setUp()
      {
          //JCS.setConfigFilename( "/TestDiskCache.ccf" );
      }
  
      /**
       * Adds items to cache, gets them, and removes them. The item count is more
       * than the size of the memory cache, so items should be dumped.
       * <p>
       * @param region
       *            Name of the region to access
       * @throws Exception
       *                If an error occurs
       */
      public void runTestForRegion( final String region )
          throws Exception
     {
         final CompositeCacheManager cacheMgr = CompositeCacheManager.getUnconfiguredInstance();
         cacheMgr.configure( "/TestDiskCache.ccf" );
         final CompositeCache<String, String> cache = cacheMgr.getCache( region );
 
         final LRUMemoryCache<String, String> lru = new LRUMemoryCache<>();
         lru.initialize( cache );
 
         // Add items to cache
 
         for ( int i = 0; i < items; i++ )
         {
             final ICacheElement<String, String> ice = new CacheElement<>( cache.getCacheName(), i + ":key", region + " data " + i );
             ice.setElementAttributes( cache.getElementAttributes() );
             lru.update( ice );
         }
 
         // Test that initial items have been purged
         for ( int i = 0; i < 100; i++ )
         {
             assertNull( "Should not have " + i + ":key", lru.get( i + ":key" ) );
         }
 
         // Test that last items are in cache
         for ( int i = 100; i < items; i++ )
         {
             final String value = lru.get( i + ":key" ).getVal();
             assertEquals( region + " data " + i, value );
         }
 
         // Test that getMultiple returns all the items remaining in cache and none of the missing ones
         final Set<String> keys = new HashSet<>();
         for ( int i = 0; i < items; i++ )
         {
             keys.add( i + ":key" );
         }
 
         final Map<String, ICacheElement<String, String>> elements = lru.getMultiple( keys );
         for ( int i = 0; i < 100; i++ )
         {
             assertNull( "Should not have " + i + ":key", elements.get( i + ":key" ) );
         }
         for ( int i = 100; i < items; i++ )
         {
             final ICacheElement<String, String> element = elements.get( i + ":key" );
             assertNotNull( "element " + i + ":key is missing", element );
             assertEquals( "value " + i + ":key", region + " data " + i, element.getVal() );
         }
 
         // Remove all the items
         for ( int i = 0; i < items; i++ )
         {
             lru.remove( i + ":key" );
         }
 
         // Verify removal
         for ( int i = 0; i < items; i++ )
         {
             assertNull( "Removed key should be null: " + i + ":key", lru.get( i + ":key" ) );
         }
     }
 }