在grails中应用jbpm4-优快云博客

Grails 底层是 spring 的 mvc， jbpm4 也内置了与 spring 集成的支持，因此在 Grails 中集成进 jbpm4 还是比较简单的。

拷贝jbpm4.jar 及依赖包到应用的 lib 下
将 jbpm.defaut.xml 改名为 jbpm.cfg.xml 拷贝到 grails-app/conf 目录下（可以是任意其它文件名）
在 resources.groovy(grails-app/conf/spring目录下，如果没有则新建一个) 中添加
```
	jbpmConfiguration(org.jbpm.pvm.internal.cfg.SpringConfiguration, "jbpm.cfg.xml"){
	}
```

同样预先配置好需要用的service

    processEngine(org.jbpm.api.ProcessEngine){ bean ->
	    bean.factoryBean = "jbpmConfiguration"
	    bean.factoryMethod = "buildProcessEngine"
    }
    repositoryService(org.jbpm.api.RepositoryService){ bean->
	    bean.factoryBean = "processEngine"
	    bean.factoryMethod = "getRepositoryService"
    }
    executionService(org.jbpm.api.ExecutionService){ bean->
	    bean.factoryBean = "processEngine"
	    bean.factoryMethod = "getExecutionService"
    }
    commandService(org.jbpm.pvm.internal.cmd.CommandService, org.jbpm.pvm.internal.cmd.CommandService.class){ bean->
        bean.factoryBean = "processEngine"
        bean.factoryMethod = "get"
    }

    taskService(org.jbpm.api.TaskService){ bean->
        bean.factoryBean = "processEngine"
        bean.factoryMethod = "getTaskService"
    }

    historyService(org.jbpm.api.HistoryService){ bean->
        bean.factoryBean = "processEngine"
        bean.factoryMethod = "getHistoryService"
    }

    identityService(org.jbpm.api.IdentityService){ bean->
        bean.factoryBean = "processEngine"
        bean.factoryMethod = "getIdentityService"
    }
    managementService(org.jbpm.api.ManagementService){ bean->
        bean.factoryBean = "processEngine"
        bean.factoryMethod = "getManagementService"
    }

在jbpm.cfg.xml 中标准事务拦截器修改为 spring 的事务拦截器

      <!--
      <standard-transaction-interceptor />
      -->
      <spring-transaction-interceptor current="true" />

同样在jbpm.cfg.xml 中，将原来 transaction-context 中的 transaction 改为 hibernate session
```
    
    <hibernate-session current="true" close="false"/>
```

在hibernate.cfg.xml中(grails-app/conf/hibernate目录下，没有则新建一个)，添加 jbpm 的 cfg 文件

<!DOCTYPE hibernate-configuration SYSTEM
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <mapping resource="jbpm.execution.hbm.xml" />
        <mapping resource="jbpm.repository.hbm.xml" />
        <mapping resource="jbpm.jpdl.hbm.xml" />
        <mapping resource="jbpm.task.hbm.xml" />
        <mapping resource="jbpm.history.hbm.xml" />
    </session-factory>
</hibernate-configuration>

注释掉对jbpm 对 hibernate 的配置

    <!--
    <hibernate-configuration>
      <cfg resource="jbpm.hibernate.cfg.xml" />
    </hibernate-configuration>

    <hibernate-session-factory />
    -->

配置完成

这样配置完后，jbpm不再采用自己的事务，而是采用 spring 管理的事务，即要求事务必须已经存在，因此在 grails中使用时，对 jbpm service 调用必须在 grails 的 service 中进行。

完整的参考 jbpm.cfg.xml 内容如下

<?xml version="1.0" encoding="UTF-8"?>

<jbpm-configuration>
  <import resource="jbpm.jpdl.cfg.xml" />
  <import resource="jbpm.identity.cfg.xml" />

  <!-- Job executor is excluded for running the example test cases. -->
  <!-- To enable timers and messages in production use, this should be included. -->
  <!--
  <import resource="jbpm.jobexecutor.cfg.xml" />
  -->
    <!--
  <import resource="jbpm.mail.templates.examples.xml" />
    -->


  <process-engine-context>

    <repository-service />
    <repository-cache />
    <execution-service />
    <history-service />
    <management-service />
    <identity-service />
    <task-service />
    <!--
    <hibernate-configuration>
      <cfg resource="jbpm.hibernate.cfg.xml" />
    </hibernate-configuration>

    <hibernate-session-factory />
    -->

    <command-service>
      <retry-interceptor />
      <environment-interceptor />
      <!--
      <standard-transaction-interceptor />
      -->
      <spring-transaction-interceptor current="true" />

    </command-service>

    <script-manager default-expression-language="juel"
                    default-script-language="juel"
                    read-contexts="execution, environment, process-engine"
                    write-context="">
      <script-language name="juel" factory="org.jbpm.pvm.internal.script.JuelScriptEngineFactory" />
    </script-manager>

    <authentication />

    <id-generator />
    <types resource="jbpm.variable.types.xml" />

    <address-resolver />

    <business-calendar>
      <monday    hours="9:00-12:00 and 12:30-17:00"/>
      <tuesday   hours="9:00-12:00 and 12:30-17:00"/>
      <wednesday hours="9:00-12:00 and 12:30-17:00"/>
      <thursday  hours="9:00-12:00 and 12:30-17:00"/>
      <friday    hours="9:00-12:00 and 12:30-17:00"/>
      <holiday period="01/07/2008 - 31/08/2008"/>
    </business-calendar>

    <mail-template name='task-notification'>
      <to users="${task.assignee}"/>
      <subject>${task.name}</subject>
      <text><![CDATA[Hi ${task.assignee},
Task "${task.name}" has been assigned to you.
${task.description}

Sent by JBoss jBPM
]]></text>
    </mail-template>

    <mail-template name='task-reminder'>
      <to users="${task.assignee}"/>
      <subject>${task.name}</subject>
      <text><![CDATA[Hey ${task.assignee},
Do not forget about task "${task.name}".
${task.description}

Sent by JBoss jBPM
]]></text>
    </mail-template>

  </process-engine-context>

  <transaction-context>
    <repository-session />
    <db-session />

    <message-session />
    <timer-session />
    <history-session />
    <mail-session>
      <mail-server>
        <session-properties resource="jbpm.mail.properties" />
      </mail-server>
    </mail-session>


    <!--
    <transaction />
    -->
    <hibernate-session current="true" close="false"/>

  </transaction-context>
</jbpm-configuration>