Spring和activiti进行整合过程解析

<dependency>
  <groupId>org.activiti</groupId>
  <artifactId>activiti-spring</artifactId>
  <version>5.22.0</version>
</dependency>

<dependencies>
  <!--spring -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.2.RELEASE</version>
  </dependency>

  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-spring</artifactId>
    <version>5.22.0</version>
  </dependency>

  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.26</version>
  </dependency>

  <dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
    <type>jar</type>
    <scope>compile</scope>
  </dependency>

  <dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
  </dependency>

  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
  </dependency>
</dependencies>

<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">

  
  <!-- 配置连接池 -->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver"/>
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/activiti_01"/>
    <property name="user" value="root"/>
    <property name="password" value="root"/>
  </bean>
  
  <!-- 事务管理器 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
  </bean>
  
  <!-- 配置使用spring提供的的流程引擎配置对象 -->
  <bean id="processEngineConfiguration"
    class="org.activiti.spring.SpringProcessEngineConfiguration">
    <property name="dataSource" ref="dataSource"></property>
    <property name="transactionManager" ref="transactionManager"></property>
    <property name="databaseSchemaUpdate" value="true"></property>
    <property name="deploymentResources" value="classpath*:/process/*.bpmn"></property>
  </bean>
  
  <!-- 配置流程引擎工厂bean，获取这个bean就可以直接获取到流程引擎对象 -->
  <!-- 注意这个不是使用静态工厂来获取bean -->
  <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
    <property name="processEngineConfiguration" ref="processEngineConfiguration"></property>
  </bean>
  
  <!-- 配置activiti的服务组件 -->
  <!-- 这里是通过实例工厂来创建服务组件的对象
  ProcessEngine类的父类EngineServices中有获取服务组件的get方法,所以这里把processEngine当做实例工厂来使用,
  而这几个对象是在创建流程引擎配置对象时就new出来的
   -->
  <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService">
  </bean>
  <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService">
  </bean>
  <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService">
  </bean>
  <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService">
  </bean>

</beans>

@Test
public void test4() {
  ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
  //通过容器获取taskService组件
  TaskService taskService= (TaskService) context.getBean("taskService");
  System.out.println(taskService);
  List<Task> list = taskService.createTaskQuery().taskAssignee("tom").list();
  for (Task task : list) {
    System.out.println(task);
  }
}