// Copyright 2003-2005 Arthur van Hoff, Rick Blair
   // Licensed under Apache License version 2.0
   // Original license LGPL
   
   package javax.jmdns.impl.tasks;
   
   import java.util.Timer;
   import java.util.logging.Level;
   import java.util.logging.Logger;
  
  import javax.jmdns.impl.JmDNSImpl;
  import javax.jmdns.impl.constants.DNSConstants;
  
  /**
   * Periodically removes expired entries from the cache.
   */
  public class RecordReaper extends DNSTask {
      static Logger logger = Logger.getLogger(RecordReaper.class.getName());
  
      /**
       * @param jmDNSImpl
       */
      public RecordReaper(JmDNSImpl jmDNSImpl) {
          super(jmDNSImpl);
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.DNSTask#getName()
       */
      @Override
      public String getName() {
          return "RecordReaper(" + (this.getDns() != null ? this.getDns().getName() : "") + ")";
      }
  
      /*
       * (non-Javadoc)
       * @see javax.jmdns.impl.tasks.DNSTask#start(java.util.Timer)
       */
      @Override
      public void start(Timer timer) {
          if (!this.getDns().isCanceling() && !this.getDns().isCanceled()) {
              timer.schedule(this, DNSConstants.RECORD_REAPER_INTERVAL, DNSConstants.RECORD_REAPER_INTERVAL);
          }
      }
  
      @Override
      public void run() {
          if (this.getDns().isCanceling() || this.getDns().isCanceled()) {
              return;
          }
          if (logger.isLoggable(Level.FINEST)) {
              logger.finest(this.getName() + ".run() JmDNS reaping cache");
          }
  
          // Remove expired answers from the cache
          // -------------------------------------
          this.getDns().cleanCache();
      }
  
  }