code: public void setExpireTime(long expireTime) {
  		// if expire time was <= 0 and is now greater, fill expire table now
  		if (this.expireTime <= 0 && expireTime > 0) {
  			long currentTime = System.currentTimeMillis();
  			Iterator values = cacheLineTable.values().iterator();
  
  			while (values.hasNext()) {
  				CacheLine line = (CacheLine) values.next();
  
  				line.setLoadTime(currentTime);
  			}
  		} else if (this.expireTime <= 0 && expireTime > 0) {// if expire time
  			// was > 0 and is
  			// now <=, do
  			// nothing, just
  			// leave the load
  			// times in place,
  			// won't hurt
  			// anything...
  		}
  
  		this.expireTime = expireTime;
  	}
docs: Sets the expire time for the cache elements. If 0, elements never expire.
  
  @param expireTime
  The expire time for the cache elements