转载需注明:
事件,是Esper的重要概念。这里我们定义个事件类,它是Temporal实体的派生类。
仅仅是对Temporal简单的包装。其代码如下:
package org.cryptocoinpartners.schema; import org.joda.time.Instant; import javax.persistence.MappedSuperclass; /** * Subclasses of Event may be posted to Context * * @author Tim Olson */
//是一个基类,在数据库中不创建表格。 @MappedSuperclass public abstract class Event extends Temporal { /** * If the Event's time has not been set when it is being published, it will be set to the current time of the * publishing Context */ public void publishedAt(Instant instant) { if( getTime() == null ) setTime(instant); } /** Most events should use this constructor to provide the time of the original happening, not the time of * object creation */ protected Event(Instant time) { super(time); } protected Event() {} }