activiti源码-1-spring配置引擎初始化_bpmn taskservice 是在哪里初始化的-优快云博客

本文链接：https://blog.youkuaiyun.com/mmllllmm/article/details/80641185

本文介绍如何在Spring环境中配置并使用Activiti工作流引擎。通过详细的XML配置示例，展示了Activiti引擎及其相关服务的初始化过程。同时，深入解析了ProcessEngineFactoryBean在Spring中的作用机制。

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activiti与spring合用，配置文件可配置如下：

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
        <property name="processEngineName" value="spring"></property>
        <property name="dataSource" ref="dataSource" />
        <property name="transactionManager" ref="transactionManager" />
        <property name="databaseSchemaUpdate" value="true" />
        <property name="jobExecutorActivate" value="false" />
        <property name="dbIdentityUsed" value="false"></property>
        <property name="asyncExecutorEnabled" value="true" />
       <property name="asyncExecutorActivate" value="true" />
    </bean>

</bean>

<bean id="repositoryService" factory-bean="processEngineFactory" factory-method="getRepositoryService" />
    <bean id="runtimeService" factory-bean="processEngineFactory" factory-method="getRuntimeService" />
    <bean id="formService" factory-bean="processEngineFactory" factory-method="getFormService" />
    <bean id="identityService" factory-bean="processEngineFactory" factory-method="getIdentityService" />
    <bean id="taskService" factory-bean="processEngineFactory" factory-method="getTaskService" />
    <bean id="historyService" factory-bean="processEngineFactory" factory-method="getHistoryService" />
    <bean id="managementService" factory-bean="processEngineFactory" factory-method="getManagementService" />

初始化入口在processEngineFactory.getObject()方法中，spring的bean加载时，每次实例返回前都会调用getObjectForBeanInstance方法（AbstractBeanFactory类中），内部会调用到BeanFactory子类的getObject()方法，利用这个机制，ProcessEngineFactoryBean作为FactoryBean的实现类，实现了模板方法getObject并在其中完成了activiti引擎的初始化工作。

public ProcessEngine getObject() throws Exception {
configureExpressionManager();
configureExternallyManagedTransactions();

if (processEngineConfiguration.getBeans() == null) {

// ProcessEngineFactoryBean实现了ApplicationContextAware接口，会得到spring的applicationContext，并把所有的bean关联到processEngineConfiguration的beans对象中，后续可通过访问processEngineConfiguration.beans得到容器中的任意bean实例

            processEngineConfiguration.setBeans(new SpringBeanFactoryProxyMap(applicationContext));
        }
        // activiti引擎实际初始化
        this.processEngine = processEngineConfiguration.buildProcessEngine();
        return this.processEngine;
    }