Shiva/CacheManager.java at master · MFTraining/Shiva · GitHub

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package shiva;

public class CacheManager {

  private static java.util.HashMap cacheHashMap = new java.util.HashMap();

    static
    {
        try
        {
                        Thread threadCleanerUpper = new Thread(
            new Runnable()
            {

               int milliSecondSleepTime = 5000;
              public void run()
              {
                try
                {

                  while (true)
                  {
                    System.out.println("ThreadCleanerUpper Scanning For Expired Objects...");

                    java.util.Set keySet = cacheHashMap.keySet();

                    java.util.Iterator keys = keySet.iterator();


                    while(keys.hasNext())
                    {

                      Object key = keys.next();
                      Cacheable value = (Cacheable)cacheHashMap.get(key);

                      if (value.isExpired())
                      {

                        cacheHashMap.remove(key);
                        System.out.println("ThreadCleanerUpper Running.Found an Expired Object in the Cache.");
                      }
                    }

                    Thread.sleep(this.milliSecondSleepTime);
                  }
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
                return;
              }
            });

            threadCleanerUpper.setPriority(Thread.MIN_PRIORITY);

            threadCleanerUpper.start();
        }
        catch(Exception e)
        {
              System.out.println("CacheManager.Static Block: " + e);
        }
    }
  public CacheManager()
  {
  }
  public static void putCache(Cacheable object)
  {


    cacheHashMap.put(object.getIdentifier(), object);
  }
  public static Cacheable getCache(Object identifier)
  {

      Cacheable object = (Cacheable)cacheHashMap.get(identifier);

    if (object == null)
      return null;
    if (object.isExpired())
    {
      cacheHashMap.remove(identifier);
      return null;
    }
    else
    {
      return object;
    }
  }

}