package org.apache.commons.jcs3.utils.struct;
   
   /*
    * 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 java.util.Map;
  
  import junit.framework.TestCase;
  
  /**
   * This ensures that the jcs version of the LRU map is as fast as the commons
   * version. It has been testing at .6 to .7 times the commons LRU.
   */
  public class LRUMapPerformanceTest
      extends TestCase
  {
      /** The put ration after the test */
      float ratioPut;
  
      /** The ratio after the test */
      float ratioGet;
  
      /** put jcs / commons ratio */
      float targetPut = 1.2f;
  
      /** get jcs / commons ratio */
      float targetGet = .5f;
  
      /** Time to loop */
      int loops = 20;
  
      /** items to put and get per loop */
      int tries = 100000;
  
      /**
       * A unit test for JUnit
       *
       * @throws Exception
       *                Description of the Exception
       */
      public void testSimpleLoad()
          throws Exception
      {
          doWork();
          assertTrue( this.ratioPut < targetPut );
          assertTrue( this.ratioGet < targetGet );
      }
  
      /**
       *
       */
      public void doWork()
      {
          long start = 0;
          long end = 0;
          long time = 0;
          float tPer = 0;
  
          long putTotalJCS = 0;
          long getTotalJCS = 0;
          long putTotalHashtable = 0;
          long getTotalHashtable = 0;
  
          String name = "LRUMap";
          String cache2Name = "";
  
          try
          {
              final LRUMap<String, String> cache = new LRUMap<>( tries );
  
              for ( int j = 0; j < loops; j++ )
              {
                  name = "JCS      ";
                  start = System.currentTimeMillis();
                  for ( int i = 0; i < tries; i++ )
                  {
                      cache.put( "key:" + i, "data" + i );
                  }
                  end = System.currentTimeMillis();
                  time = end - start;
                  putTotalJCS += time;
                  tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                  System.out.println( name + " put time for " + tries + " = " + time + "; millis per = " + tPer );
 
                 start = System.currentTimeMillis();
                 for ( int i = 0; i < tries; i++ )
                 {
                     cache.get( "key:" + i );
                 }
                 end = System.currentTimeMillis();
                 time = end - start;
                 getTotalJCS += time;
                 tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                 System.out.println( name + " get time for " + tries + " = " + time + "; millis per = " + tPer );
 
                 ///////////////////////////////////////////////////////////////
                 cache2Name = "LRUMap (commons)";
                 //or LRUMapJCS
                 final Map<String, String> cache2 = new org.apache.commons.collections4.map.LRUMap<>( tries );
 //                Map<String, String> cache2 = new ConcurrentLinkedHashMap.Builder<String, String>()
 //                        .maximumWeightedCapacity( tries )
 //                        .build();
                 //cache2Name = "Hashtable";
                 //Hashtable cache2 = new Hashtable();
                 start = System.currentTimeMillis();
                 for ( int i = 0; i < tries; i++ )
                 {
                     cache2.put( "key:" + i, "data" + i );
                 }
                 end = System.currentTimeMillis();
                 time = end - start;
                 putTotalHashtable += time;
                 tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                 System.out.println( cache2Name + " put time for " + tries + " = " + time + "; millis per = " + tPer );
 
                 start = System.currentTimeMillis();
                 for ( int i = 0; i < tries; i++ )
                 {
                     cache2.get( "key:" + i );
                 }
                 end = System.currentTimeMillis();
                 time = end - start;
                 getTotalHashtable += time;
                 tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                 System.out.println( cache2Name + " get time for " + tries + " = " + time + "; millis per = " + tPer );
 
                 System.out.println( "\n" );
             }
         }
         catch ( final Exception e )
         {
             e.printStackTrace( System.out );
             System.out.println( e );
         }
 
         final long putAvJCS = putTotalJCS / loops;
         final long getAvJCS = getTotalJCS / loops;
         final long putAvHashtable = putTotalHashtable / loops;
         final long getAvHashtable = getTotalHashtable / loops;
 
         System.out.println( "Finished " + loops + " loops of " + tries + " gets and puts" );
 
         System.out.println( "\n" );
         System.out.println( "Put average for LRUMap       = " + putAvJCS );
         System.out.println( "Put average for " + cache2Name + " = " + putAvHashtable );
         ratioPut = Float.intBitsToFloat( (int) putAvJCS ) / Float.intBitsToFloat( (int) putAvHashtable );
         System.out.println( name + " puts took " + ratioPut + " times the " + cache2Name + ", the goal is <" + targetPut
             + "x" );
 
         System.out.println( "\n" );
         System.out.println( "Get average for LRUMap       = " + getAvJCS );
         System.out.println( "Get average for " + cache2Name + " = " + getAvHashtable );
         ratioGet = Float.intBitsToFloat( (int) getAvJCS ) / Float.intBitsToFloat( (int) getAvHashtable );
         System.out.println( name + " gets took " + ratioGet + " times the " + cache2Name + ", the goal is <" + targetGet
             + "x" );
     }
 }