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"
??????? />
? </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);