Sloth 简介(二)
首先,谢谢大家的关注,为了让大家进步了解Sloth,我们将会在尽快上传介绍文档,
并逐步整理发布Sloth的源代码和一些辅助文档;
上一篇文章中只是简单介绍了Sloth的一些功能,在这篇文章中,我们将具体介绍Sloth
的一些操作;
相关链接:
组装业务
1. 为什么要使用组装业务
在拥有 Sloth 之前我们需要完成一个业务逻辑时一般采用的习惯模式是——将所有符合该
业务使用的相关类以 reference 的模式包含在这个业务包(以一个动态链结库或一个解决方案
中的项目存在)中,整体编译——这能迅速满足当前实现业务逻辑的需要,快速生成需要部
署的业务,在一定程度上使程序员的步进跟踪调试变得简单。
看起来不错,是吗?那么再让我们深入的想想下面的几个问题:
-
程序员交付给测试人员的代码相互交织,测试工作的颗粒性如何有效保证?
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如果业务逻辑所引用的底层库不得不重构,需要重新提交给测试人员多少代码?
-
务逻辑本身的错误? -
-
编译模块?
传统模式是紧密耦合的,项目后期由于业务需求变动——很不幸,这样的变动往往无法
避免——所需要的修改本身涉及的面很可能非常广,甚至异常复杂。这造成仅仅处于开发
阶段时,整个项目的可维护性和可管理性就无法保证!项目可控性的急剧下降,不仅是开发
时间的延长,工作量更会快速增加!
是否可以设想,如果只是在表示层申明一个对业务调用的别名,而不用具体处理业务是
怎样完成的,一旦发生重构性的修改,除非是对业务的重组,表示层也不会发生变动!于是,
我们仅需要着手于业务组件的细化,通过配置文件,就可以进行业务的调整。
下面让我们看看Sloth的处理。
Sloth与业务组件的通讯依赖于一个 Xml 配置文件(ControlBus.xml)进行交互,这个文件
中记录了需求管理者和软件设计师对业务过程的配置信息。就是说,改变了 Xml 中指定业
务的配置过程顺序,同时也会改变Sloth对该业务逻辑的执行效果。下一节,将有一个例子来
说明Sloth的处理模式。
2. 如何使用组装业务
示例业务:客户端程序录入个人基本信息及部门名称,系统自动获得“部门名称”对应
的部门编号,最后将个人信息及部门编号保存到数据库;
首先编写服务程序,分别实现两个业务逻辑:
Ø 个人信息保存:
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Ø 根据部门名称获得部门编号
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以上,我们完成了业务组件的编写,当然我们需要一个通用的数据库操作组件,类似于
下面的结构(业务层与数据层同样是断耦的!)
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业务组件及数据操作组件都有了,可是我们并没有完整的实现业务逻辑,
在Sloth下,业务方法的组合是很简单的事:
打开Sloth的配置工具,首先将编写的业务组件(只需要dll或exe等文件)
添加到Sloth中,如图这时就能在配置工具的[注册业务组件]下看到这个业务组件了;
双击这个业务组件,就可以看到组件中包含的几个类:
我们看到这个业务逻辑涉及到三个必要的方法,SavePersonnel需要的是部门
编号而不是部门名称,所以我们在执行SavePersonnel方法前,必须先得到部门编号,
也就是说,我们执行的顺序应该是先使用search方法得到部门编号,并将部门编号
传递到SavePersonnel中构造SQL语句,最后,构造好的SQL交由数据操作方法
Execute去执行,完成整个业务逻辑;
配置业务逻辑流程如图:
2.1 设置(SavePersonnel)方法的参数来源及下一节点
如图所示:SavePersonnel的deptNo参数来源于search方法的返回参数
2.2 整个流程的配置图(图形界面):
业务逻辑配置完成后,可自定义虚拟业务名称,例如SavePersonInfo。虚拟
业务的配置信息保存于配置文件中(ControlBus.xml),Sloth将根据此配置文件
来调用业务组件,您甚至可以直接修改配置文件来更改、重组业务。
接下来,我们看看客户端怎么调用这个业务:
整个虚拟业务返回值为最后一个方法Excute的返回值(Bool类型),所以,我们
的客户端代码就应为:
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这样就可以完成虚拟业务的调用了.这时一旦发生业务变化,我只需要修改业务逻辑
配置;如果发生了业务重构,也只需将变动的业务组件重新拷贝覆盖以前的业务组件即可。
至于事务控制,目前Sloth支持分布式事务控制(DTS),但是默认关闭,需要在
配置工具中做相应设置即可。以后将详细讲解。
3. 目前存在的不足
3.1 . 组装业务的入口方法必须首先拖拉到图形配置页面;
3.2. 业务组合后,目前只能以最后一个方法的返回类型作为整个虚拟业务的返回
类型;
这些缺陷我们会在以后的版本中逐步完善,也希望大家都来参与或提出建议;
后话
最后,QuartetLounge Team感谢大家的关注,我们将尽快发布更详细的介绍文档及源代码。
近期还将发布演示视频。希望大家多提建议。