�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20013;&#25991;&#23383;&#24149;&#19968;&#21306;&#20108;&#21306;&#19977;&#21306;&#22235;&#21306;&#44;&#20037;&#20037;&#22269;&#20135;&#31934;&#21697;&#20813;&#36153;&#35270;&#39057;&#44;&#33394;&#29408;&#29408;&#20037;&#20037;&#97;&#97;&#21271;&#26465;&#40635;&#22915;</title><link>http://www.aygfsteel.com/fullqin/category/34344.html</link><description /><language>zh-cn</language><lastBuildDate>Tue, 16 Sep 2008 13:38:52 GMT</lastBuildDate><pubDate>Tue, 16 Sep 2008 13:38:52 GMT</pubDate><ttl>60</ttl><item><title>【原】通过jbpm源码分析jbpm引擎内核工作原理</title><link>http://www.aygfsteel.com/fullqin/archive/2008/09/16/229236.html</link><dc:creator>囧囧之猪</dc:creator><author>囧囧之猪</author><pubDate>Tue, 16 Sep 2008 11:28:00 GMT</pubDate><guid>http://www.aygfsteel.com/fullqin/archive/2008/09/16/229236.html</guid><wfw:comment>http://www.aygfsteel.com/fullqin/comments/229236.html</wfw:comment><comments>http://www.aygfsteel.com/fullqin/archive/2008/09/16/229236.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/fullqin/comments/commentRss/229236.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/fullqin/services/trackbacks/229236.html</trackback:ping><description><![CDATA[<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Jbpm�Q�他是jboss下的一个开源项目，是个��Z��petri net理论为基���的工作流引擎。本文主要通过jbpm源代码分析下jbpm引擎内核工作原理�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Jbpm是基于微内核引擎的基���上扩展开发出来的工作�����^収ͼ�其运行的核心包是在org.jbpm.graph下，在该包下又分有action、def、exe、log、node几个包，jbpm内核引擎实现逻辑主要存放在def、exe�q�两个包下，其他的包是基于此内核扩展出来的动作、模型和日志�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 下面我们通过一个简单的例子来逐步的分析jbpm是如何工作的。看下面jbpm自带演示的一个hello���程�Q�视乎大安���喜欢从hello实现开始^_^�Q�，代码如下�Q?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public void testHelloWorldProcess() {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;process-definition&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;start-state&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;transition to='s' /&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;/start-state&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;state name='s'&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;transition to='end' /&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;/state&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" &lt;end-state name='end' /&gt;" +<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;/process-definition&gt;"<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ProcessInstance processInstance =new ProcessInstance(processDefinition);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Token token = processInstance.getRootToken();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;assertSame(processDefinition.getStartState(), token.getNode());<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;token.signal();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;assertSame(processDefinition.getNode("s"), token.getNode());<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;token.signal();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;assertSame(processDefinition.getNode("end"), token.getNode());<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 首先�Q�我们定义个���程模板�Q�ProcessDefinition�Q�，���是上面代码的ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(&#8230;.);�q�段�Q�在括号中是jbpm定义的流�E�，其中包括三个环节�Q�分别是starts-state、state和end-state。parseXmlString�Q�）�Ҏ��的主要功能是解析�q�段xml语言�q�回个流�E�模板对象（processDefinition�Q��?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 接着�Q�通过���程实例�c�（ProcessInstance�Q�来实例化个���程实例�Q�通过传进来的���程模板对象创徏ProcessInstance processInstance =new ProcessInstance(processDefinition)。我们来看看new ProcessInstance(processDefinition)到底做了什么，通过查看ProcessInstance的源代码�Q�可以看到其中主要的一�D�|��<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public ProcessInstance( ProcessDefinition processDefinition ) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//略去其他代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.processDefinition = processDefinition; //���流�E�模板对象付�l�流�E�实�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.rootToken = new Token(this); //创徏跟��o�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//略去其他代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 我们�l�箋跟进Token�q�个�c?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public Token(ProcessInstance processInstance) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //主要一句如�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; this.node = processInstance.getProcessDefinition().getStartState();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�q�样���实��C��令牌�l�定到开始节炏V��至此，一个流�E�实例就创徏��h��了，�q�且该流�E�实例走��C��开始节点，即��o牌所处的位置�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我们接着往下走token.signal()<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public void signal() {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;signal(node.getDefaultLeavingTransition(), new ExecutionContext(this));<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//�q�里的getDefaultLeavingTransition()如果有多条�\径，则去�W�一条�\�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;void signal(Transition transition, ExecutionContext executionContext) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //省略其他代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node.leave(executionContext, transition);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //省略其他代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; }<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�q�里的node���是刚才令牌所在的开始节点，我们来看看jbpm是如何将令牌从开始节点移��C��个节点的�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public void leave(ExecutionContext executionContext, Transition transition) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Token token = executionContext.getToken();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; token.setNode(this);//此时令牌�q�在开始节�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; executionContext.setTransition(transition);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //略去部分代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;executionContext.setTransitionSource(this);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; transition.take(executionContext);//实现令牌的�{�U?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我们来看看transition.take(..)�Ҏ��做了什�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public void take(ExecutionContext executionContext) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //略去部分代码<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; to.enter(executionContext);//���d��开始节点，�q�入��C��个节�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;大家可能会有点疑问，�q�个to节点是什么是否初始化的？其实在signal时有句node.getDefaultLeavingTransition()�Q�这句返回Transition对象�Q�该对象���已�l�初始化了to节点的对象。我们在跟进to.enter(..)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public void enter(ExecutionContext executionContext) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Token token = executionContext.getToken();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; token.setNode(this);//此时令牌���到了名字�ؓ&#8220;s&#8221;的state节点<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; token.setNodeEnter(new Date());<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; executionContext.setTransition(null);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; executionContext.setTransitionSource(null);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; execute(executionContext);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在这�D�代码中的注释这句，真正实现了��o牌从开始节点到下个节点了�?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;��x���Q�jbpm工作���引擎的内部工作原理��׃���l�完了，其实�q�就是工作流引擎最核心的部分了�Q�就是如何从一个环节�{�U�d��另一个环节。或�怽�会说&#8220;�q�么���单，我马上就可以写一�?#8221;�Q�其实不�Ӟ��上面我们所用的例子是十分简单的例子�Q�其实在工作���联盟规范中�q�有其他复杂的节�Ҏ��型，如split�Q�join�Q�subflow�{�。不�q�幸�q�的是这些复杂的节点模型jbpm都�ؓ我们提供了他自己的默认的实现�Q�这些节�Ҏ��型都在org.jbpm.graph.node包下。jbpm引擎中很好的抽象了节�Ҏ��型Node�c�，大部分的复杂节点模型都��承自Node�Q�我们也可以定制自己的节点，只要实现Node�cȝ��execute()�Ҏ��卛_��方便的实现。其实从上面分析的代码可以看出，Node�c�M��要的逻辑处理是在leave()、enter()和execute()三个�Ҏ���Q�大家可以看下ProcessState�Q�join�Q�fork�q�些节点模型是如何实现的�?br />
以上���单介�l�了jbpm引擎内核的工作原理，如有不对的地方还望指正�?br />
</p>
 <img src ="http://www.aygfsteel.com/fullqin/aggbug/229236.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/fullqin/" target="_blank">囧囧之猪</a> 2008-09-16 19:28 <a href="http://www.aygfsteel.com/fullqin/archive/2008/09/16/229236.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>从基于db的workflow转战到jbpm</title><link>http://www.aygfsteel.com/fullqin/archive/2008/09/15/229013.html</link><dc:creator>囧囧之猪</dc:creator><author>囧囧之猪</author><pubDate>Mon, 15 Sep 2008 10:21:00 GMT</pubDate><guid>http://www.aygfsteel.com/fullqin/archive/2008/09/15/229013.html</guid><wfw:comment>http://www.aygfsteel.com/fullqin/comments/229013.html</wfw:comment><comments>http://www.aygfsteel.com/fullqin/archive/2008/09/15/229013.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/fullqin/comments/commentRss/229013.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/fullqin/services/trackbacks/229013.html</trackback:ping><description><![CDATA[<p><span style="font-family: 宋体">&nbsp;&nbsp;&nbsp; 开始接触工作流是两�q�前�Q�那时刚�q�公司，自己也算是个新手�Q�到公司后被分配到做</span>IT<span style="font-family: 宋体">�|�管的项目组�Q�做了些东西�Q�后来成立了个新的项目组�Q�我被分配到�q�个新组成的��目�l�，也就是从�q�以后开始接触工作流的。当时对工作���是一�Ҏ��念都没有�Q�慢慢从公司开发的��Z��</span>db<span style="font-family: 宋体">的工作流�q�_��开始接触工作流�Q��ƈ��Z��此工作流�q�_���l�合业务开发了几个模块�?br />
</span><span style="font-family: 宋体">&nbsp;&nbsp;&nbsp; 公司的这个基�?/span>db<span style="font-family: 宋体">的工作流�q�_���q�是实现了许多功能：<br />
</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<span style="font-family: 宋体">、基�?/span>web<span style="font-family: 宋体">的流�E�设计器�Q�主要是��Z��</span>IE<span style="font-family: 宋体">�?/span>vml<span style="font-family: 宋体">语言开发的�Q�可以设计出如下囄������程模板�?br />
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_4.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">此流�E�模板包括开始环节，�l�束环节以及人工处理的两个环节（专家�l�处理和发�v人确认）�Q�实现环节的自��@环以及回朔，分别�?#8220;专家�l�处�?#8221;环节�?#8220;发�v人确�?#8221;环节上实现。基于此���程�q�行中的实例囑֦�下：</span></p>
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_instance.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp; 2<span style="font-family: 宋体">、环节的扭�{<br />
</span>&nbsp;&nbsp;&nbsp; A<span style="font-family: 宋体">、串�?br />
</span><span style="font-family: 宋体">&nbsp;&nbsp;&nbsp; 像上图中介绍的就是实��C��串行的功能�?br />
</span>&nbsp;&nbsp;&nbsp; B<span style="font-family: 宋体">、�ƈ�?/span><span style="font-size: 10.5pt; font-family: 宋体">如图<br />
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_5.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp; C<span style="font-family: 宋体">、多实例�Q�即�q�_��所说的会签�Q?br />
</span><span style="font-family: 宋体">&nbsp;&nbsp;&nbsp; 实现了包括所有会�{�N��完成后才往下个环节走和几个会签后就可往下个环节走的功能�Q�流�E�的模板如图�Q?br />
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_3.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp; <span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中环节模板上带&#8220;</span><span lang="EN-US">M</span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&#8221;的环节就表示是多实例的环节�?br />
</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">&nbsp;&nbsp;&nbsp; �q�行中的实例如图�Q?br />
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_1.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp; D<span style="font-family: 宋体">、子���程</span><span style="font-size: 10.5pt; font-family: 宋体">子流�E�是在一个虚拟环节中实现的，卌���环节不是人工环节。如图：<br />
<img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_ss.gif" border="0" /><br />
&nbsp;&nbsp;&nbsp; <span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">基本上一个简单的工作�����^台的功能都差不多实现了，不过在��用过�E�中�q�是发现了许多的弊端�Q�毕竟系�l�的逻辑大部分是��Z��数据库函数实现的�Q�这使得大部分的逻辑都要依赖于数据库�Q�而外围的一些基�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">java</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">的逻辑实现���比较难实现了，举个例子�Q�在和外�pȝ��做接口时�Q�当某个环节竣工后要向外�pȝ��发信息，而信息是通过</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">url</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">的方式传递的�Q�这个用</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">java</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">实现是很�Ҏ��的，而用数据库函数就无法直接实现了（据目前自己掌握的技术判断，不知是否有办法实玎ͼ�望知道者告知）�Q�现在变通的一个做法是在数据库里保存信息，然后通过</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">quartz</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">定时的扫描该表，有数据则通过</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">httpclient</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">�l�外�pȝ��发送信息。还有模型本�w�只有开始环节，�l�束环节�Q�虚拟环节和人工执行环节�Q���得客��h��的要按业务�\��q��功能���无法实��C���Q�因为缺���个判断环节模板�Q�就�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">jbpm</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">中的</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">decision</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">环节模板�Q�所以在创徏下个环节的时候大部分都是��Zؓ的主观去判断到底是走上图中的&#8220;�Ҏ��审核&#8221;�q�是&#8220;��d��分配&#8221;环节。这使得�q�用���程整合业务逻辑时�ƈ没有完全的实现流�E�的自动化�?br />
&nbsp;&nbsp;&nbsp; <span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其实�q�有很多的缺��P��只是我们都是通过变相的方式给予了实现�Q�可是客��h��些需求在该��^��C���q�是无法实现的。鉴于此�Q�就开始寻扑ּ�源的工作���引擎，�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">osworkflow</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">jbpm</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">shark</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">�{�的开源工作流引擎中选择�?/span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">jbpm</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。�ؓ什么会选择</span><span lang="EN-US" style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">jbpm</span><span style="font-size: 10.5pt; font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">呢？原因�q�是蛮多的，具体列出几条如下几条�Q?br />
</span>&nbsp;&nbsp;&nbsp; 1�?nbsp;<span style="font-family: 宋体">��Z��</span>petri net<span style="font-family: 宋体">理论实现的工作流�?br />
</span>&nbsp;&nbsp;&nbsp; 2�?nbsp;<span style="font-family: 宋体">引擎核心以微内核的方式实玎ͼ�主要逻辑都在</span>graph<span style="font-family: 宋体">包下�Q��?br />
</span>&nbsp;&nbsp;&nbsp; 3�?nbsp;<span style="font-family: 宋体">��Z��</span>hibernate<span style="font-family: 宋体">实现持久化�?br />
</span>&nbsp;&nbsp;&nbsp; 4�?nbsp;<span style="font-family: 宋体">很容易的�?/span>spring<span style="font-family: 宋体">实现整合�Q�通过</span>spring-modules<span style="font-family: 宋体">实现整合�?br />
</span><span style="font-size: 10.5pt; font-family: 宋体">�{�。最后附上一个最复杂的流�E�图�Q�像蜘蛛�|�更贴切^_^�Q?br />
</span></span></span></span></span></span></span><img alt="" src="http://www.aygfsteel.com/images/blogjava_net/fullqin/34626/r_2.gif" border="0" />&nbsp; 
 <img src ="http://www.aygfsteel.com/fullqin/aggbug/229013.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/fullqin/" target="_blank">囧囧之猪</a> 2008-09-15 18:21 <a href="http://www.aygfsteel.com/fullqin/archive/2008/09/15/229013.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                      <footer>
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