content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.util;
  
  import org.junit.Assert;
  
  import java.util.*;
  
  /**
   * @author mycat
   */
  public class MapPerfMain {
  
      public void t1() {
          Map<String, Date> m = new HashMap<String, Date>();
          for (int i = 0; i < 100000; i++) {
              m.put(UUID.randomUUID().toString(), new Date());
          }
          remove1(m);
          Assert.assertEquals(0, m.size());
      }
  
      public void t2() {
          Map<String, Date> m = new HashMap<String, Date>();
          for (int i = 0; i < 100000; i++) {
              m.put(UUID.randomUUID().toString(), new Date());
          }
          remove2(m);
          Assert.assertEquals(0, m.size());
      }
  
      void remove1(Map<String, Date> m) {
          Iterator<Map.Entry<String, Date>> it = m.entrySet().iterator();
          while (it.hasNext()) {
              it.next().getValue();
              it.remove();
          }
      }
  
      void remove2(Map<String, Date> m) {
          Iterator<Map.Entry<String, Date>> it = m.entrySet().iterator();
          while (it.hasNext()) {
              it.next().getValue();
          }
          m.clear();
      }
  
  }