工作流Activiti的学习总结（四）Spring和Activiti的整合配置讲解
Spring和Activiti的整合：
在Spring和Activiti的整合中ProcessEngineFactoryBean成为了两者的整合点。ProcessEngineFactoryBean为org.activiti.spring.ProcessEngineFactoryBean。提供了ProcessEngine的配置和创建的功能。<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
...
</bean>
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
如果在包含事物的activiti配置如下：<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<!-- 采用spring的数据源类创建一个数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
<property name="driverClass" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
<property name="username" value="sa" />
<property name="password" value="" />
</bean>
<!-- 创建一个事物管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 创建一个流程引擎的配置对象 -->
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
<property name="dataSource" ref="dataSource" />
<property name="transactionManager" ref="transactionManager" />
<!-- 设置数据库schema的更新方式 -->
<property name="databaseSchemaUpdate" value="true" />
<!-- 是否启动jobExecutor -->
<property name="jobExecutorActivate" value="false" />
</bean>
<!-- 创建一个流程引擎bean -->
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
<!-- 创建activiti提供的各种服务 -->
<!-- 工作流仓储服务 -->
<bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
<!-- 工作流运行服务 -->
<bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
<!-- 工作流任务服务-->
<bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
<!-- 工作流历史数据服务-->
<bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
<!-- 工作流管理服务-->
<bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />
<!-- 工作流唯一服务 -->
<bean id="IdentityService" factory-bean="processEngine" factory-method="getIdentityService" />
...
工作流中Expressions的使用
在使用spring的SpringProcessEngineConfiguration时，如果没有beans属性表示所有bean都可以暴露给activiti的流程文件xml访问。如果配置beans但是没有配置map中bean信息，则没有暴露的bean。如果map中配置部分bean表示只是暴露部分bean给activiti使用。
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">...
<property name="beans">
<map>
<entry key="printer" value-ref="printer" />
</map>
</property>
</bean>
<bean id="printer" class="org.activiti.examples.spring.Printer" />
暴露的bean可以在activiti的流程xml中使用。如下调用bean的方法
<beanid="printer"class="org.activiti.examples.spring.Printer"/>
<definitions id="definitions" ...>
<process id="helloProcess">
<startEvent id="start" />
<sequenceFlow id="flow1" sourceRef="start" targetRef="print" />
<serviceTask id="print" activiti:expression="#{printer.printMessage()}" />
<sequenceFlow id="flow2" sourceRef="print" targetRef="end" />
<endEvent id="end" />
</process>
</definitions>public class Printer {
public void printMessage() {
System.out.println("hello world");
}
}
自动资源部署（Automatic resource deploy）<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
...
<property name="deploymentResources" value="classpath*:/org/activiti/spring/test/autodeployment/autodeploy.*.bpmn20.xml" />
</bean>
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
Spring和activit的整合测试@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:org/activiti/spring/test/junit4/springTypicalUsageTest-context.xml")
public class MyBusinessProcessTest {
@Autowired
private RuntimeService runtimeService;
@Autowired
private TaskService taskService;
@Autowired
@Rule
public ActivitiRule activitiSpringRule;
@Test
@Deployment
public void simpleProcessTest() {
runtimeService.startProcessInstanceByKey("simpleProcess");
Task task = taskService.createTaskQuery().singleResult();
assertEquals("My Task", task.getName());
taskService.complete(task.getId());
assertEquals(0, runtimeService.createProcessInstanceQuery().count());
}
}
当在spring的配置中配置ActivitiRule时候，测试bean将自动被注入：
<bean id="activitiRule" class="org.activiti.engine.test.ActivitiRule">
<property name="processEngine" ref="processEngine" />
</bean>