流程编排及可视化 | 京东云技术团队
作者：京东科技开发者
- 2023-07-19 北京
本文字数：13836 字
阅读完需：约 45 分钟
写在前面
这里只介绍 liteflow 的简单基础使用以及作者对 liteflow 进行可视化扩展的相关阐述
一、背景及意义
背景：对于拥有复杂业务逻辑的系统承载着核心业务逻辑，这些核心业务逻辑涉及内部逻辑运算，缓存操作，持久化操作，外部资源调取，内部其他系统 RPC 调用等等。项目几经易手，维护的成本就会越来越高。各种硬代码判断，分支条件越来越多。代码的抽象，复用率也越来越低，各个模块之间的耦合度很高。一小段逻辑的变动，会影响到其他模块，需要进行完整回归测试来验证。如要灵活改变业务流程的顺序，则要进行代码大改动进行抽象，重新写方法。实时热变更业务流程，几乎很难实现
意义：逻辑解耦、提高扩展性、降低维护成本、能力充分复用、流程灵活编排
二、常用流程编排框架
三、liteflow 基础使用
1.添加依赖 jar 包
<dependency> <groupId>com.yomahub</groupId> <artifactId>liteflow-spring</artifactId> <version>2.10.4</version></dependency>
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2.定义组件
定义组件和实现某些组件，注册进上下文
@Component("a")public class ACmp extends NodeComponent {
@Override public void process() { //do your business }}
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3.配置
添加对应的配置类及配置文件
Spring xml 中的配置
<context:component-scan base-package="com.yomahub.flowtest.components" />
<bean id="springAware" class="com.yomahub.liteflow.spi.spring.SpringAware"/>
<bean class="com.yomahub.liteflow.spring.ComponentScanner"/>
<bean id="liteflowConfig" class="com.yomahub.liteflow.property.LiteflowConfig"> <property name="ruleSource" value="config/flow.el.xml"/></bean>
<bean id="flowExecutor" class="com.yomahub.liteflow.core.FlowExecutor"> <property name="liteflowConfig" ref="liteflowConfig"/></bean>
<!-- 如果上述enableLog为false，下面这段也可以省略 --><bean class="com.yomahub.liteflow.monitor.MonitorBus"> <property name="liteflowConfig" ref="liteflowConfig"/></bean>
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4.规则文件的定义
--流程的定义(第 3 步中 liteflowConfig 指定了规则文件为 config/flow.xml)，所以需要在 resources 下新建文件夹 config,在新建 flow.xml 文件，配置要定义的流程
<?xml version="1.0" encoding="UTF-8"?><flow> <chain name="chain1"> THEN(a, b, c) </chain></flow>
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5.执行
编排好的流程,在需要执行的地方注入 FlowExecutor，执行 execute2Resp
@Componentpublic class YourClass{ @Resource private FlowExecutor flowExecutor; @Test public void testConfig(){ LiteflowResponse response = flowExecutor.execute2Resp("chain1", "arg"); }}
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四、liteflow 在实际中的应用
这里弱化背后的实际业务只展示作者在实际中的应用案例
1.添加依赖 jar 包
<properties> <liteflow-spring.version>2.8.0</liteflow-spring.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>com.yomahub</groupId> <artifactId>liteflow-spring</artifactId> <version>${liteflow-spring.version}</version> </dependency> </dependencies> </dependencyManagement>
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2.定义组件
定义组件和实现某些组件，注册进上下文
@LiteflowComponent("checkRealNameAuthCmp")@LiteflowCmpDefinepublic class CheckRealNameAuthCmp { private static final Logger log = LoggerFactory.getLogger(CheckRealNameAuthCmp.class); @LiteflowMethod(LiteFlowMethodEnum.PROCESS) public void process(NodeComponent nodeComponent) throws Exception { // 获取请求参数 GeneratePolicyRightsParam generatePolicyRightsParam = nodeComponent.getSlot().getRequestData(); // 如果pin为空则结束流程 if (generatePolicyRightsParam == null || StringUtil.isEmpty(generatePolicyRightsParam.getUserPin())) { log.info("CheckRealNameAuthCmp -> process end, nodeComponent={},pin is null.", JsonUtil.toJSONString(nodeComponent)); nodeComponent.setIsEnd(true); } //封装设置流程编排上下文信息 GenerateRightsContext generateRightsContext = nodeComponent.getContextBean(GenerateRightsContext.class); generateRightsContext.setGeneratePolicyRightsParam(generatePolicyRightsParam); }}
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LiteflowComponent：https://liteflow.yomahub.com/pages/v2.8.X/8486fb/
LiteflowCmpDefine：https://liteflow.yomahub.com/pages/v2.8.X/f33919/
3.配置
添加对应的配置类及配置文件
Spring xml 中的配置
spring-config.xml
<import resource="classpath*:spring/spring-config-liteflow.xml"/>
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spring-config-liteflow.xml
<bean id="springAware" class="com.yomahub.liteflow.spi.spring.SpringAware"/> <bean id="springComponentScaner" class="com.yomahub.liteflow.spring.ComponentScanner"/>
<!-- 注入liteflow的配置文件 --> <bean id="liteflowConfig" class="com.yomahub.liteflow.property.LiteflowConfig"> <property name="ruleSource" value="liteflow/flow.xml"/> </bean>
<!-- 注入liteflow的执行引擎 --> <bean id="flowExecutor" class="com.yomahub.liteflow.core.FlowExecutor"> <property name="liteflowConfig" ref="liteflowConfig"/> </bean>
<!-- 注入liteflow的MonitorBus--> <bean class="com.yomahub.liteflow.monitor.MonitorBus"> <constructor-arg ref="liteflowConfig"/> <property name="liteflowConfig" ref="liteflowConfig"/> </bean>
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4.规则文件的定义
--流程的定义(第 3 步中 liteflowConfig 指定了规则文件为 liteflow/flow.xml)，所以需要在 resources 下新建文件夹 liteflow,在新建 flow.xml 文件，配置要定义的流程
flow.xml
<?xml version="1.0" encoding="UTF-8"?><flow> <!-- liteflow流程编排：生成(发放)保单权益--> <chain name="sendPolicyRightsChain"> <when value="checkRealNameAuthCmp"/> <then value="checkNewPolicyRightsCmp"/> <then value="getPolicyInfoCmp"/> <then value="policyMatchServiceRuleCmp"/> <then value="initPolicyRightsDataCmp"/> <then value="creatPlanGantRightsDataCmp"/> <then value="asyncFullFillCmp"/> </chain></flow>
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5.执行
执行编排好的流程,在需要执行的地方注入 FlowExecutor，执行 execute2Resp
@Resource private FlowExecutor flowExecutor;
public Boolean sendPolicyRights(GeneratePolicyRightsParam generatePolicyRightsParam) { //todo 入参和上下文不能混用，通用信息用map LiteflowResponse response = flowExecutor.execute2Resp("sendPolicyRightsChain", generatePolicyRightsParam, GenerateRightsContext.class,GenerateRightsContext.class); }
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五、liteflow 能力扩展(可视化)
liteflowt 提供了流程编排的能力，只有研发人员能够了解这内在的流程编排含义，对于其他产品或者业务并不能直观的了解当前的业务流程，可视化并不友好。这时我们如何让当前的流程可视化呢？编写一个页面直接读取配置文件 flow.xml 进行显示，这是没有意义的。有意义的是我们能够对组件进行可视化、对流程可视化、对流程编排可视化。
1、思想
提供新的 jar 包，获取到业务系统声名的组件、流程、显示流程和组件、提供编排能力。
说明：
1、小工具 jar 包为可视化流程编排小工具，主要提供获取业务系统声明的组件、保存的流程、进行流程可视化展示、进行流程编排可视化等，使用 liteflow-util 标识区别于业务系统。
2、业务系统为组件声明、流程执行、业务逻辑系统，使用 liteflow-test 标识
2、实现
2.1 获取特定的类或方法
如何从 liteflow-util 中获取 liteflow-test 中声明的组件
2.1.1 获取上下文环境
ApplicationContextAware
当一个 bean 的属性初始化后会回调到 setApplicationContext，从而设置应用上下文。
public interface ApplicationContextAware extends Aware { /** * Set the ApplicationContext that this object runs in. * Normally this call will be used to initialize the object. *
Invoked after population of normal bean properties but before an init callback such * as {@link org.springframework.beans.factory.InitializingBean#afterPropertiesSet()} * or a custom init-method. Invoked after {@link ResourceLoaderAware#setResourceLoader}, * {@link ApplicationEventPublisherAware#setApplicationEventPublisher} and * {@link MessageSourceAware}, if applicable. * @param applicationContext the ApplicationContext object to be used by this object * @throws ApplicationContextException in case of context initialization errors * @throws BeansException if thrown by application context methods * @see org.springframework.beans.factory.BeanInitializationException */ void setApplicationContext(ApplicationContext applicationContext) throws BeansException;}
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在 liteflow-util 中使用一个类来实现 ApplicationContextAware，从而获取到 liteflow-test(依赖当前 jar 包的应用)的上下文环境
@Configurationpublic class LiteFlowApplicationContext implements ApplicationContextAware { private static ApplicationContext controllerApplicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { System.out.println("applicationContext = " + applicationContext); LiteFlowApplicationContext.controllerApplicationContext=applicationContext; } public static ApplicationContext getControllerApplicationContext() { return controllerApplicationContext; }}
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2.1.2 从上下文获取类
在 liteflow-util 中根据上下文环境获取组件类这里的重点是 Map<String, Object> mvcObjects = context.getBeansWithAnnotation(Service.class);
@Slf4jpublic class ReferenceManager { private static Map<Class<?>, Object> interfaceMapRef = new ConcurrentHashMap<Class<?>, Object>(); private static ReferenceManager instance; private ReferenceManager() { } public synchronized static ReferenceManager getInstance() { if (null != instance) { return instance; } instance = new ReferenceManager(); ApplicationContext controllerContext = LiteFlowApplicationContext.getControllerApplicationContext(); interfaceMapInit(controllerContext); return instance; } private static void interfaceMapInit(ApplicationContext context) { try { Map<String, Object> objects = Maps.newHashMapWithExpectedSize(64); //优化 允许 ServiceBean 被MVC容器扫描 Map<String, Object> mvcObjects = context.getBeansWithAnnotation(Service.class); objects.putAll(mvcObjects); if (objects == null || objects.size() == 0) { return; } for (Entry<String, Object> entry : objects.entrySet()) { /** * 获取代理对象的原对象 * 因为 jdk 动态代理通过接口 */ Object objectImplProxy = entry.getValue(); Object objectImpl = AopTargetUtils.getTarget(objectImplProxy); Class objectImplClass = objectImpl.getClass(); if (objectImplClass.getInterfaces().length > 0) { /** * 规定 每个interface 只对应 一个实现类 * 如果 多个类实现了该接口 接口列表中只 显示第一个实现类 */ Class interfaceClass = objectImplClass.getInterfaces()[0]; Object object = interfaceMapRef.get(interfaceClass); if (object == null) { interfaceMapRef.put(interfaceClass, objectImpl); } else { } } else { } } } catch (Exception e) { } } public Map<Class<?>, Object> getInterfaceMapRef() { return interfaceMapRef; }}
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@Componentpublic class ServiceScanner { public Set<Class<?>> classes() { return interfaceMapRef().keySet(); } public Map<Class<?>, Object> interfaceMapRef() { return ReferenceManager.getInstance().getInterfaceMapRef(); }}
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public class AopTargetUtils { /** * 获取 目标对象 * @param proxy 代理对象 * @return * @throws Exception */ public static Object getTarget(Object proxy) throws Exception {
if(!AopUtils.isAopProxy(proxy)) { return proxy;//不是代理对象 } if(AopUtils.isJdkDynamicProxy(proxy)) { return getJdkDynamicProxyTargetObject(proxy); } else { //cglib return getCglibProxyTargetObject(proxy); } } private static Object getCglibProxyTargetObject(Object proxy) { try{ Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0"); h.setAccessible(true); Object dynamicAdvisedInterceptor = h.get(proxy); Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised"); advised.setAccessible(true); Object target = ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget(); return target; } catch(Exception e){ e.printStackTrace(); return null; } } private static Object getJdkDynamicProxyTargetObject(Object proxy) { try{ Field h = proxy.getClass().getSuperclass().getDeclaredField("h"); h.setAccessible(true); AopProxy aopProxy = (AopProxy) h.get(proxy); Field advised = aopProxy.getClass().getDeclaredField("advised"); advised.setAccessible(true); Object target = ((AdvisedSupport) advised.get(aopProxy)).getTargetSource().getTarget(); return target; } catch(Exception e){ e.printStackTrace(); return null; } }}
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2.2 访问 liteflow-util 页面
如何在 liteflow-test 里访问到 liteflow-util 包里的页面并展示
(1)在 liteflow-util 内编写一个 Servlet 类,直接继承 HttpServlet ，重写 doGet 或者 doPost 方法
(2)在 liteflow-util 内将 Servlet 类配置到 web.xml 中
(3)在 liteflow-util 内准备前端的页面(form 表单、按钮交互)
(4)在 liteflow-test 内引入依赖并启动 liteflow-test
2.2.1HttpServlet
public class HandServlet extends HttpServlet { private static final Logger log = LoggerFactory.getLogger(HandServlet.class); private String username = null; private String password = null; private ServletContext servletContext; public HandServlet() { } @Override public void init(ServletConfig config) { log.info("HandServlet->init,start"); this.username = config.getInitParameter("loginUsername"); this.password = config.getInitParameter("loginPassword"); this.servletContext = config.getServletContext(); log.info("HandServlet->init finish"); } @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws IOException { String contextPath = request.getContextPath(); String servletPath = request.getServletPath(); String requestURI = request.getRequestURI(); response.setCharacterEncoding("utf-8"); if (contextPath == null) { contextPath = ""; } String uri = contextPath + servletPath; String path = requestURI.substring(contextPath.length() + servletPath.length()); String usernameParam; if (!Objects.equals("/submitLogin", path)) { if (this.needLogin(request, path)) { this.redirect(request, response); } else { Result result; try { result = this.requestHandler(path, request); } catch (Throwable var11) { log.error("HandServlet->service,requestHandler error", var11); result = Result.buildFail(var11.getMessage()); } if (null != result) { response.getWriter().print(JSON.toJSONString(result)); } else { this.returnResourceFile(path, uri, response); } } } else { usernameParam = request.getParameter("loginUsername"); String passwordParam = request.getParameter("loginPassword"); System.out.println("usernameParam = " + usernameParam); System.out.println("passwordParam = " + passwordParam);// if (this.username.equals(usernameParam) && this.password.equals(passwordParam)) { HttpSession session = request.getSession(); session.setAttribute("lite-flow", this.username); session.setMaxInactiveInterval(300); response.getWriter().print(JSON.toJSONString(Result.buildSuccess("success")));// } else {// response.getWriter().print(JSON.toJSONString(Result.buildFail("用户名或密码错误")));// } } } private void redirect(HttpServletRequest request, HttpServletResponse response) throws IOException { if (request.getHeader("X-Requested-With") != null && "XMLHttpRequest".equals(request.getHeader("X-Requested-With"))) { response.getWriter().print(JSON.toJSONString(Result.buildReLogin())); } else if (request.getHeader("Accept") != null && request.getHeader("Accept").contains("application/json")) { response.getWriter().print(JSON.toJSONString(Result.buildReLogin())); } else { response.sendRedirect("/lite-flow/login.html"); } } private Result requestHandler(String path, HttpServletRequest request) { System.out.println("path = " + path); System.out.println("request = " + request); String initMenu = "/initMenu"; String liteflow = "/liteflow"; if (initMenu.equals(path)) { Map<String, Object> map = new HashMap(2); List<String> classObjectMap = getClassObjectMap(); classObjectMap.forEach(item -> { int i = item.lastIndexOf("."); String substring = item.substring(i+1); System.out.println("substring = " + substring); LiteFlowNodeBuilder.createCommonNode().setId(substring).setName(substring).setClazz(item).build(); }); map.put("interfaceMapRef", classObjectMap); return Result.buildSuccess(map); } else if (liteflow.equals(path)) { try { try { String postData = this.getPostData(request); log.info("HandServlet -> requestHandler start, postData={}", postData); JSONObject jsonObject = JSONObject.parseObject(postData); JSONArray checkList = jsonObject.getJSONArray("checkList"); String chainId = (String) jsonObject.get("chainId"); log.info("HandServlet -> requestHandler start, path={},checkList={}", path, checkList); ArrayList arrayList = new ArrayList(); checkList.forEach(item -> { String itemStr = (String) item; int i = itemStr.lastIndexOf("."); String substring = itemStr.substring(i+1); arrayList.add(substring); }); String str = StringUtils.join(arrayList, ","); log.info("HandServlet -> requestHandler start, str={}", str);// String elss = "THEN(" + str + ")";// log.info("HandServlet -> requestHandler start, elss={}", elss); Condition condition = LiteFlowConditionBuilder.createCondition(ConditionTypeEnum.TYPE_THEN).setValue(str).build(); log.info("HandServlet -> requestHandler start, condition={}", condition); LiteFlowChainBuilder.createChain().setChainName(chainId).setCondition(condition).build(); } catch (Throwable var3) { log.error("HandServlet -> requestHandler exception 未知异常, var3={}", var3); } } catch (Throwable var3) { log.info("MqUtil->haveProducer,error", var3); } return Result.buildSuccess(false); } else { return null; } }
public String getPostData(HttpServletRequest request) { StringBuilder data = new StringBuilder(); String line; BufferedReader reader; try { reader = request.getReader(); while (null != (line = reader.readLine())) { data.append(line); } } catch (IOException e) { return null; } return data.toString(); }
private List<String> getClassObjectMap() { List<String> result = new ArrayList<>(); WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext); Map<String, ServiceScanner> serviceScannerMap = webApplicationContext.getBeansOfType(ServiceScanner.class); ServiceScanner serviceScanner = serviceScannerMap.get("serviceScanner"); Map<Class<?>, Object> interfaceMapRef = serviceScanner.interfaceMapRef(); if (null != interfaceMapRef) { //排序 所有接口 List<Map.Entry<Class<?>, Object>> arrayList = new ArrayList<Map.Entry<Class<?>, Object>>(interfaceMapRef.entrySet()); Collections.sort(arrayList, new Comparator<Map.Entry<Class<?>, Object>>() { @Override public int compare(Map.Entry<Class<?>, Object> o1, Map.Entry<Class<?>, Object> o2) { return o1.getKey().getSimpleName().compareTo(o2.getKey().getSimpleName()); } }); //遍历 所有接口 for (Map.Entry<Class<?>, Object> entry : arrayList) { String className = entry.getValue().getClass().getName(); System.out.println("class = " + className); result.add(className);// List<Method> interfaceMethodList = Arrays.asList(entry.getKey().getDeclaredMethods());// //方法列表排序// Collections.sort(interfaceMethodList, new Comparator<Method>() {// @Override// public int compare(Method o1, Method o2) {// return o1.getName().compareTo(o2.getName());// }// });// for (Method method : interfaceMethodList) {// System.out.println("method = " + method);// System.out.println("methodName = " + method.getName());// System.out.println("methodParameterTypes = " + method.getParameterTypes());// System.out.println("methodReturn = " + method.getReturnType());// } }
} System.out.println("result = " + result); return result; } private boolean needLogin(HttpServletRequest request, String path) { return this.isRequireAuth() && !this.alreadyLogin(request) && !this.checkLoginParam(request) && !"/login.html".equals(path) && !path.startsWith("/css") && !path.startsWith("/js") && !path.startsWith("/img"); } private boolean checkLoginParam(HttpServletRequest request) { String usernameParam = request.getParameter("loginUsername"); String passwordParam = request.getParameter("loginPassword"); if (null != this.username && null != this.password) { return this.username.equals(usernameParam) && this.password.equals(passwordParam); } else { return false; } } private boolean isRequireAuth() { return this.username != null; } private boolean alreadyLogin(HttpServletRequest request) { HttpSession session = request.getSession(false); return session != null && session.getAttribute("lite-flow") != null; } private void returnResourceFile(String fileName, String uri, HttpServletResponse response) throws IOException { String filePath = this.getFilePath(fileName); if (filePath.endsWith(".html")) { response.setContentType("text/html; charset=utf-8"); } if (fileName.endsWith(".jpg")) { byte[] bytes = Utils.readByteArrayFromResource(filePath); if (bytes != null) { response.getOutputStream().write(bytes); } } else { String text = Utils.readFromResource(filePath); if (text == null) { response.sendRedirect(uri + "/login.html"); } else { if (fileName.endsWith(".css")) { response.setContentType("text/css;charset=utf-8"); } else if (fileName.endsWith(".js")) { response.setContentType("text/javascript;charset=utf-8"); }
response.getWriter().write(text); } } } private String getFilePath(String fileName) { return "view" + fileName; }
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2.2.2 配置 web.xml
在 liteflow-util 内 web.xml 配置自定义的 servlet
<servlet> <servlet-name>handOfLite</servlet-name> <servlet-class>com.xx.utils.liteflow.handler.HandServlet</servlet-class> <init-param> <param-name>loginUsername</param-name> <param-value>Username</param-value> </init-param> <init-param> <param-name>loginPassword</param-name> <param-value>Password</param-value> </init-param> <load-on-startup>5</load-on-startup> </servlet>
<servlet-mapping> <servlet-name>handOfLite</servlet-name> <url-pattern>/hand-of-lite/*</url-pattern> </servlet-mapping>
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2.2.3 页面准备
在 liteflow-util 内准备显示组件的页面
2.2.4 访问页面
在 liteflow-test 内添加 liteflow-util 的依赖
<dependency> <groupId>com.xx.utils</groupId> <artifactId>liteflow</artifactId> <version>0.0.1-SNAPSHOT</version></dependency>
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启动 liteflow-test 工程并访问对应的路径,看到 2.2.3 准备的页面
2.3 获取组件并回显
2.3.1 自定义注解
在 liteflow-util 内自定义注解，作用装配导入需要的资源类和配置
@Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)@Target(value = { java.lang.annotation.ElementType.TYPE })@Documented@Import({LiteFlowApplicationContext.class, FlowExecutor.class, LiteflowConfig.class, IdGeneratorHolder.class})@ComponentScan( basePackages = {"com.xx.utils", "com.xx.utils.liteflow"})public @interface EnableLiteFlow {
}
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2.3.2 引入 jar 包依赖
在 liteflow-util 内引入 lite-flow 核心依赖
<dependency> <groupId>com.yomahub</groupId> <artifactId>liteflow-spring</artifactId> <version>2.8.3</version></dependency>
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在 liteflow-test 内引入 liteflow-util 依赖
<dependency> <groupId>com.xx.utils</groupId> <artifactId>liteflow</artifactId> <version>0.0.1-SNAPSHOT</version></dependency>
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2.3.3 配置 liteflow-util
在 liteflow-test 中使用自定义注解导入需要的配置
@Configuration@EnableLiteFlowpublic class LiteFlowConfig {}
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2.3.4 显示组件类
重启 liteflow-test，访问页面显示已获取到的组件集合
2.4 创建新的组件
liteflow-util 提供对于的 RequestMapping 创建和保存 node
@RestController@RequestMapping("/node")public class NodeController { private static final Logger log = LoggerFactory.getLogger(NodeController.class);
/** * 构建一个普通组件 */ @RequestMapping("/createCommonNode") @ResponseBody public Boolean createCommonNode(@RequestBody NodeParam nodeParam) { log.info("NodeController -> createCommonNode start, nodeParam={}", nodeParam.toString()); try { //构建一个普通组件 LiteFlowNodeBuilder.createCommonNode().setId(nodeParam.getId()).setName(nodeParam.getName()).setClazz(nodeParam.getClazz()).build(); return Boolean.TRUE; } catch (Exception e) { return Boolean.FALSE; } } /** * 构建一个普通条件组件 */ @RequestMapping("/createSwitchNode") @ResponseBody public Boolean createSwitchNode(@RequestBody NodeParam nodeParam) { try { LiteFlowNodeBuilder.createSwitchNode().setId(nodeParam.getId()).setName(nodeParam.getName()).setClazz(nodeParam.getClazz()).build(); return Boolean.TRUE; } catch (Exception e) { return Boolean.FALSE; } }}
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2.5 创建新的流程
https://liteflow.yomahub.com/pages/v2.8.X/9aa85a/
LiteFlowChainELBuilder.createChain().setChainName("chain2").setEL( "THEN(a, b, WHEN(c, d))").build();
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3、整体的总结
其实整体的思想就是提供一个 jar 包，从这个 jar 包里可以获取到被依赖工程里的类创建对应的组件、创建流程、保存流程、回显流程、执行流程等，这里涉及 springbean 的生命周期、上下文环境、httpservlet、自定义注解、反射、前端页面等相关知识的融合应用。
作者：京东健康 马仁喜
来源：京东云开发者社区
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