directtimesource.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

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********************************************************************************/
/*
 *  Created on Nov 8, 2005
 */
package rice.environment.time.simulated;

import rice.environment.logging.*;
import rice.environment.params.Parameters;
import rice.environment.time.TimeSource;

/**
 * DESCRIBE THE CLASS
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author jeffh
 */
public class DirectTimeSource implements TimeSource {

  private long time = 0;
  private Logger logger = null;
  private String instance;

  /**
   * Constructor for DirectTimeSource.
   *
   * @param time DESCRIBE THE PARAMETER
   */
  public DirectTimeSource(long time) {
    this(time, null);
  }

  /**
   * Constructor for DirectTimeSource.
   *
   * @param time DESCRIBE THE PARAMETER
   * @param instance DESCRIBE THE PARAMETER
   */
  public DirectTimeSource(long time, String instance) {
    if (time < 0) {
      time = System.currentTimeMillis();
    } else {
      this.time = time;
    }
    this.instance = instance;
  }

  /**
   * Constructor for DirectTimeSource.
   *
   * @param p DESCRIBE THE PARAMETER
   */
  public DirectTimeSource(Parameters p) {
    this(p.getLong("direct_simulator_start_time"));
  }

  /**
   * Sets the LogManager attribute of the DirectTimeSource object
   *
   * @param manager The new LogManager value
   */
  public void setLogManager(LogManager manager) {
    logger = manager.getLogger(DirectTimeSource.class, instance);
  }

  /**
   * Sets the Time attribute of the DirectTimeSource object
   *
   * @param newTime The new Time value
   */
  public void setTime(long newTime) {
    if (newTime < time) {
      throw new RuntimeException("Attempted to set time from " + time + " to " + newTime + ".");
    }
    if (logger.level <= Logger.FINE) {
      logger.log("DirectTimeSource.setTime(" + time + "=>" + newTime + ")");
    }
    time = newTime;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public long currentTimeMillis() {
    return time;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param millis DESCRIBE THE PARAMETER
   */
  public void incrementTime(int millis) {
    setTime(time + millis);
  }

}