package ejava.examples.asyncmarket.ejb;
   
   import java.text.DateFormat;
   import java.text.SimpleDateFormat;
   import java.util.Date;
   import java.util.concurrent.Future;
   
   import javax.ejb.AsyncResult;
   import javax.ejb.Asynchronous;
  import javax.ejb.Stateless;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * This class contains some demo methods to perform example actions on 
   * behalf of the AuctionMgmtEJB.
   */
  @Stateless
  public class AuctionMgmtActionEJB {
  	private static Logger logger = LoggerFactory.getLogger(AuctionMgmtActionEJB.class);
  	
      /**
       * Perform action synchronously while caller waits.
       */
  	public Date doWorkSync(long delay) {
  		DateFormat df = new SimpleDateFormat("HH:mm:ss.SSS");
  		logger.debug("sync method {} starting {} delay at {}", Thread.currentThread().getId(), delay, df.format(new Date()));
  		try { Thread.sleep(delay); }
  		catch (Exception ex) {
  			logger.error("unexpected error during sleep", ex);
  		}
  		Date now = new Date();
  		logger.debug("sync method {} completed {} delay at {}", Thread.currentThread().getId(), delay, df.format(now));
  		
  		return now;
  	}    
  
  	/**
  	 * Perform action async from caller
  	 */
  	@Asynchronous
  	public Future<Date> doWorkAsync(long delay) {
  		DateFormat df = new SimpleDateFormat("HH:mm:ss.SSS");
  		logger.debug("async method {} starting {} delay at {}", Thread.currentThread().getId(), delay, df.format(new Date()));
  		try { Thread.sleep(delay); }
  		catch (Exception ex) {
  			logger.error("unexpected error during sleep", ex);
  		}
  		Date now = new Date();
  		logger.debug("async method {} completed {} delay at {}", Thread.currentThread().getId(), delay, df.format(now));
  		
  		return new AsyncResult<Date>(now);
  	}    
  }