Esper事件处理引擎_17_EPL 语法_9_Schema 声明数据类型

官方地址：http://www.espertech.com

Esper 事件引擎栏目：http://blog.csdn.net/xiaohulunb/article/category/2436609

EPL 语法代码见-GitHub代码地址：点击打开链接

涉及 Javabean,Listener,main 以 GitHub 包下为最新更，注释解释排版有问题可参考源码

EPL_9_Schema

package com.framework_technology.esper.epl;import com.java.annotation.document.Keyword;import com.java.annotation.document.Undigested;/** * API - 5.16. Declaring an Event Type: Create Schema * * @author wei.Li by 14-8-21. */public class EPL_9_Schema {    /**     * 声明一个提供事件类型的名称和数据类型     * <p>     * 语法：     * <p>     * create [map | objectarray] schema schema_name [as]     * (property_name property_type [,property_name property_type [,...])     * [inherits inherited_event_type[, inherited_event_type] [,...]]     * [starttimestamp timestamp_property_name]     * [endtimestamp timestamp_property_name]     * [copyfrom copy_type_name [, copy_type_name] [,...]]     * <p>     * 1.任何Java类名，完全合格或引入简单的类名配置。     * 2.添加左右方括号[]到任何类型来表示一个数组类型的事件属性。     * 3.使用事件类型名称作为属性类型。     * <p>     *     * @return epl[]     */    protected static String declareSchema() {        // Declare type SecurityEvent        String epl1 = "create schema SecurityEvent as (ipAddress string, userId String, numAttempts int)";        // 声明指定字段名称和数据类型 与 POJO[hostinfo]        String epl2 = "create schema AuthorizationEvent(group String, roles String[], hostinfo com.mycompany.HostNameInfo)";        // 声明一个有其他 schema 数组类型的字段innerEvents        String epl3 = "create schema CompositeEvent(group String, innerEvents SecurityEvent[])";        // 声明类型WebPageVisitEvent继承自PageHitEvent所有属性        @Keyword(keyWord = "inherits", Description = "继承")        String epl4 = "create schema WebPageVisitEvent(userId String) inherits PageHitEvent";        // 声明一个类型的起始和结束时间戳（即事件与持续时间）(i.e. event with duration)        String epl5 = "create schema RoboticArmMovement (robotId string, startts long, endts long)" +                "starttimestamp startts endtimestamp endts";        //创建具有SecurityEvent的所有属性加一个用户名属性类型        @Keyword(keyWord = "copyfrom", Description = "复制")        String epl6 = "create schema ExtendedSecurityEvent (userName string) copyfrom SecurityEvent";        //创建具有SecurityEvent的所有属性类型        String epl7 = "create schema SimilarSecurityEvent () copyfrom SecurityEvent";        //创建具有SecurityEvent和WebPageVisitEvent的所有属性加一个用户名属性类型        String epl8 = "create schema WebSecurityEvent (userName string) copyfrom SecurityEvent, WebPageVisitEvent";        // 显示完整的包名 LoginEvent event type        String epl9 = "create schema LoginEvent as com.mycompany.LoginValue";        // 当把包名配置后，无需加包名        String epl10 = "create schema LogoutEvent as SignoffValue";        return epl1;    }    /**     * 使用实例     *     * @return epl     */    protected static String useSchema() {        String epl1 = "create schema SecurityData (name String, roles String[])";        String epl2 = "create window SecurityEvent.win:time(30 sec) " +                " (ipAddress string, userId String, secData SecurityData, historySecData SecurityData[])";        return epl1;    }}