jbpm4学习入门--环境布署

1、下载， jboss.org下的jbpm4，ecplise 3.5, mysql 5

2、安装jbpm4的数据库

     在mysql上建一个学习用的db

    在jbpm4里找到  jbpm-4.0\db\schema.scripts\jbpm.mysql.create.sql

  执行，生成jbpm4需要的数据库表。

3、在ecplise里建一个学习项目(java)，并把 jbpm4\lib里所有的jar以及jbpm.jar加入编译环境

   从 jbpm4的example的目录下的xml得到到本项目的src目录下，

   主要是要用 jbpm.cfg.xml、jbpm.hibernate.cfg.xml

   把jbpm.hibernate.cfg.xml 的数据库连接设置改改如下，使能连上mysql。

    <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/jbpm</property>
    <property name="hibernate.connection.username">usr</property>
    <property name="hibernate.connection.password">pwd</property>

4、写一个java类 HelloJBPM4

package ex;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.api.Configuration;
import org.jbpm.api.Execution;
import org.jbpm.api.ExecutionService;
import org.jbpm.api.HistoryService;
import org.jbpm.api.IdentityService;
import org.jbpm.api.ManagementService;
import org.jbpm.api.ProcessEngine;
import org.jbpm.api.ProcessInstance;
import org.jbpm.api.RepositoryService;
import org.jbpm.api.TaskService;

public class HelloJBPM4 {
 
 protected final Log log = LogFactory.getLog(getClass());
   protected static ProcessEngine processEngine = null;

   protected static RepositoryService repositoryService;
   protected static ExecutionService executionService;
   protected static ManagementService managementService;
   protected static TaskService taskService;
   protected static HistoryService historyService;
   protected static IdentityService identityService;
  
   protected synchronized void initialize() {
      if (processEngine==null) {

        String jbpmTestCfgType = System.getProperty("jbpm.test.cfg.type");
        log.debug(jbpmTestCfgType);
        Configuration configuration = new Configuration(jbpmTestCfgType);

        String jbpmTestCfgResource = System.getProperty("jbpm.test.cfg.resource");
        log.debug("jbpmTestCfgResource-->"+jbpmTestCfgResource);
        if (jbpmTestCfgResource!=null) {
          configuration.setResource(jbpmTestCfgResource);
        }

        processEngine = configuration.buildProcessEngine();
       
        log.debug("using ProcessEngine "+System.identityHashCode(processEngine));

        repositoryService = processEngine.get(RepositoryService.class);
        executionService = processEngine.getExecutionService();
        historyService = processEngine.getHistoryService();
        managementService = processEngine.getManagementService();
        taskService = processEngine.getTaskService();
        identityService = processEngine.getIdentityService();
      }
   }
   private void doJob(){
    initialize();
    String deploymentId;
    deploymentId = repositoryService.createDeployment()
         .addResourceFromClasspath("ex/HelloJBPM4.jpdl.xml")
         .deploy();
    ProcessInstance processInstance = executionService.startProcessInstanceByKey("Custom");
      Execution executionInPrintDots = processInstance.findActiveExecutionIn("print dots");
      String executionId = executionInPrintDots.getId();
      executionService.signalExecutionById(executionId);
    repositoryService.deleteDeploymentCascade(deploymentId);
   }
  public static void main(String arg[]){
   HelloJBPM4 ex=new HelloJBPM4();
   ex.doJob();
  
  }
}

代码是从JbpmTestCase.java、org.jbpm.examples.custom中复制过来的

略改了一改，就是一个jbpm4的helloworld了。

注意：org.jbpm.examples.custom下的xml改名为HelloJBPM4.jpdl.xml

     类路径也改为ex

5、执行这个类（java application）

成功的话，在ecplise的console里打印一个美女的点图。

HelloJBPM4.jpdl.xml 里调用了PrintDots.java

这个也是从org.jbpm.examples.custom复制过来的

HelloJBPM4.jpdl.xml

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

<process name="Custom" xmlns="http://jbpm.org/4.0/jpdl">

  <start g="20,20,48,48">
    <transition to="print dots" />
  </start>

  <custom name="print dots"
        class="ex.PrintDots"
        g="96,16,100,52">
       
    <transition to="end" />
  </custom>
 
  <end name="end" g="231,19,80,40"/>

</process>

6、总结

  用ecplise画工作流图，生成jpdl.xml

  自己写个java类把jpdl.xml导入数据库。

  deploymentId = repositoryService.createDeployment()
         .addResourceFromClasspath("ex/HelloJBPM4.jpdl.xml")
         .deploy();
 

  下面代码把流程从数据库中取出，并执行

  ProcessInstance processInstance = executionService.startProcessInstanceByKey("Custom");
      Execution executionInPrintDots = processInstance.findActiveExecutionIn("print dots");
      String executionId = executionInPrintDots.getId();
      executionService.signalExecutionById(executionId);