深入osworkflow的function

作者：kiral 原文地址：http://kiral.iteye.com/blog/190253

1.基本概念
  osworkflow里使用自定义的function来执行业务代码，如步骤“拟稿”，当你执行提交操作的时候，可以自定义一个funciton用来保存稿件到业务数据库。

  function分为pre-function(前置方法)和post-function（后置方法），前置函数在step和action之前执行， 后置方法在step和action之后执行。

2.如何使用
2.1 定义前置function
前置方法，放在action里results之前。

<action id="100" name="启动工作流">
  <pre-functions>
    <function type="class">
    <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
  </pre-functions>
  <results>
    <unconditional-result old-status="Finished" status="Underway" step="1" owner="${caller}"/>
  </results>
</action>

2.2 定义后置function
后置方法，放在action里results之后。

<action id="100" name="启动工作流">
  <results>
    <unconditional-result old-status="Finished" status="Underway" step="1" owner="${caller}"/>
  </results>
  <post-functions>
    <function type="class">
    <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
  </post-functions>
</action>

2.3 执行benshell
osworkflow支持在function里执行beanshell脚本。

<post-functions>
  <function type="beanshell">
    <arg name="script"> 
      System.out.println("step is success!!!");
    </arg>
  </function>
</post-functions>

2.4 自定义function
实现FunctionProvider接口来自定义自己的function.如下：

public class MyFunction implements FunctionProvider {

    @SuppressWarnings("unchecked")
    public void execute(Map transientVars, Map args, PropertySet ps) throws WorkflowException {
        
    }

}

在function里你能够得到caller(调用者的名字),workflowID（工作流ID）,actionId(操作ID)。

WorkflowEntry workflowEntry = (WorkflowEntry) transientVars.get("entry");
long workflowId = workflowEntry.getId();
BasicWorkflowContext context = (BasicWorkflowContext) transientVars.get("context");
String caller = context.getCaller();
int actionId = (Integer) transientVars.get("actionId");

3.使用spring来管理function
osworkflow支持使用spring来管理function和condition的生命周期。

3.1 让spring来管理function
在bean.xml做如下配置

<!-- 将工作流的function和condition交给spring管理 -->
	<bean id="resolver"
		class="com.opensymphony.workflow.util.SpringTypeResolver">
	</bean>

这样通过byName的注入方式,注入到你的AbstractWorkflow的bean里。
或者
AbstractWorkflow workflow = new BasicWorkflow(userName);
workflow.setResolver(workflowTypeResolver);
workflow.setConfiguration(osworkflowConfiguration);

3.2定义myFunction的bean
<bean id="myFunction" class="MyFunction" />

3.2配置bean的function

<post-functions>					
  <function type="spring">				
    <arg name="bean.name">myFunction</arg>
  </function>
</post-functions>

arg的name为bean.name
注意：<arg name="bean.name">myFunction</arg>必须放在同一行，因为myFunction旁边有空格的话，会找不到myFunction bean。

更多osworkflow讨论，请进入osworkflow组：[url]http://osworkflow.group.iteye.com/ [/url]

恩，不错，osworkflow与其他业务模块交互就靠funciton了

可以找这本书来看看
OSWorkflow: A guide for Java developers and architects to integrating open-source Business Process Management (Paperback)

http://www.amazon.com/OSWorkflow-developers-architects-integrating-open-source/dp/1847191525

最近一直在研究osworkflow,
很想看看lllyq说的这本书。

怎么实现会签阿，谢谢啦

工作流初学者：
参考：http://hi.baidu.com/vjame/blog/item/43a537d1719caf3d9b50279d.html

增加两个conditon，
第一个：如果会签的人都签字了，进入下一个步骤。
第二个：如果还未有人未会签，则循环当前步骤。

你好，我是这样配置的   
<bean id="workflowTypeResolver" class="com.opensymphony.workflow.util.SpringTypeResolver">
<property name="functions">
<map>
<entry key="stockCheckPassFunction">
<value>com.atsig.market.workflow.function.StockCheckPassFunction</value>
</entry>
</map>
</property>
    </bean>


<bean id="stockCheckPassFunction" class="com.atsig.market.workflow.function.StockCheckPassFunction">

</bean>

  <post-functions>
<function type="spring">
<arg name="bean.name">stockCheckPassFunction</arg>
</function>
   </post-functions>
但却报此错误，我不知道是什么原因，你是否可以告诉我，谢谢了.
com.opensymphony.workflow.WorkflowException: No type or class.name argument specified to TypeResolver
at com.opensymphony.workflow.TypeResolver.getFunction(TypeResolver.java:84)
at com.opensymphony.workflow.AbstractWorkflow.executeFunction(AbstractWorkflow.java:860)
at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(AbstractWorkflow.java:1273)
at com.opensymphony.workflow.AbstractWorkflow.doAction(AbstractWorkflow.java:567)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)
at $Proxy0.doAction(Unknown Source)
at com.atsig.market.stock.service.StockWorkflowSerImpl.doAction(StockWorkflowSerImpl.java:77)
at com.atsig.market.stock.controller.StockApplyCheckupController.dealWithAction(StockApplyCheckupController.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:473)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:410)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)

我想在Function中通过Spring注入属性，但确获得的值为Null,我该如何给Function注入属性？。我一个初学值，不太懂，有说的不对的地方，还请见谅，谢谢。

用osworkflow 做过几个小东西，感觉到osworkflow的确太麻烦，准备最近抽时间封装一下