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Solon Flow：轻量级流程编排引擎，让业务逻辑更优雅

news 来源：原创 2025/6/26 11:01:41

在当今快速迭代的软件开发环境中，如何高效地管理和执行业务流程成为了开发者面临的重要挑战。Solon Flow作为Solon生态中的流程编排引擎，以其轻量级、高灵活性和强大的表达能力，为开发者提供了一种全新的解决方案。

为什么选择Solon Flow？

Solon Flow是一款基于YAML/JSON配置的流程编排引擎，它完美融合了"配置即代码"的理念，具有以下核心优势：

极简配置：采用YAML/JSON格式，配置简洁直观，支持自动推断和简化模式
多场景支持：无缝支持业务规则编排、计算任务编排、审批流程等多种场景
强大脚本能力：内置完整Java语法支持，可与多种脚本引擎集成
事件驱动架构：基于DamiBus实现的事件总线，实现组件间解耦
双模式引擎：同时支持无状态和有状态流程，满足不同业务需求

快速入门体验

让我们通过一个简单的Hello World示例，感受Solon Flow的魅力：

1. 添加依赖

<dependency><groupId>org.noear</groupId><artifactId>solon-flow</artifactId>
</dependency>

2. 配置流程(demo1.chain.yml)

id: "c1"
layout:- { id: "n1", type: "start", link: "n2"}- { id: "n2", type: "activity", link: "n3", task: "System.out.println(\"Hello Solon Flow!\");"}- { id: "n3", type: "end"}

3. 执行流程

@Component
public class DemoApp implements LifecycleBean {@Injectprivate FlowEngine flowEngine;@Overridepublic void start() {flowEngine.eval("c1"); // 输出：Hello Solon Flow!}
}

核心功能解析

1. 灵活的流程配置

Solon Flow支持完整的流程图概念，包括链(Chain)、节点(Node)和连接(Link)。节点类型丰富：

开始节点(start)：流程入口，每个链必须有且只有一个
活动节点(activity)：执行具体任务，支持条件和脚本
网关节点(inclusive/exclusive/parallel)：控制流程分支
结束节点(end)：流程终点

# 审批流程示例
id: "leave-approval"
title: "请假审批"
layout:- { id: "start", type: "start", title: "发起申请", meta: {form: "leave"}, link: "tl-review"}- { id: "tl-review", type: "activity", title: "主管审批", meta: {role: "team-leader"}, link: "gate-3days"}- { id: "gate-3days", type: "exclusive", link: [{nextId: "dm-review", title: "超过3天", condition: "days > 3"},{nextId: "end", title: "3天内"}]}- { id: "dm-review", type: "activity", title: "部门经理审批", meta: {role: "dept-manager"}, link: "end"}- { id: "end", type: "end"}

2. 强大的脚本与表达式

Solon Flow默认支持完整的Java语法脚本，同时可通过定制驱动器集成Aviator、Beetl等脚本引擎：

# 业务规则示例
id: "risk-control"
layout:- { type: "start"}- { when: "score < 60", task: "context.result = '高风险'; actions.add('人工审核')"}- { when: "score >= 60 && score < 80", task: "context.result = '中风险'"}- { when: "score >= 80", task: "context.result = '低风险'; actions.add('自动通过')"}- { type: "end"}

3. 组件化开发模式

通过实现TaskComponent接口，可以将业务逻辑封装为可复用的组件：

@Component("scoreCalc")
public class ScoreCalculator implements TaskComponent {@Overridepublic void run(FlowContext context, Node node) {Order order = context.get("order");// 计算逻辑...order.setScore(calculateScore(order));}private int calculateScore(Order order) {// 评分算法实现}
}

在流程中引用组件：

id: "order-process"
layout:- { type: "start"}- { task: "@scoreCalc"}  # 使用评分组件- { task: "@riskCheck"}  # 使用风控组件- { type: "end"}

4. 事件驱动架构

Solon Flow内置基于DamiBus的事件总线，实现组件间解耦：

# 事件发送示例
id: "event-demo"
layout:- task: |// 发送事件context.eventBus().send("order.created", order);- task: |// 发送并等待响应String result = context.<String,String>eventBus().sendAndRequest("risk.check", order);

事件监听处理：

public class RiskListener {@Injectprivate FlowEngine engine;public void init() {FlowContext context = new FlowContext();context.<String,String>eventBus().listen("risk.check", event -> {Order order = event.getContent();event.reply(checkRisk(order));});engine.eval("event-demo", context);}
}

企业级特性

1. 有状态流程支持

对于审批类场景，Solon Flow提供了StatefulFlowEngine：

// 配置有状态引擎
@Bean
public StatefulFlowEngine flowEngine() {return StatefulFlowEngine.newInstance(StatefulSimpleFlowDriver.builder().stateController(new RoleBasedStateController()).stateRepository(new RedisStateRepository()).build());
}// 审批处理示例
public void approve(String instanceId, String nodeId, String userId) {FlowContext context = new FlowContext(instanceId).put("user", userId);flowEngine.postActivityState(context, nodeId, StateType.COMPLETED);
}

2. 拦截器机制

通过ChainInterceptor可以实现流程监控、日志记录等横切关注点：

@Component
public class MetricsInterceptor implements ChainInterceptor {@Overridepublic void doIntercept(ChainInvocation inv) throws Throwable {long start = System.currentTimeMillis();try {inv.invoke();} finally {long cost = System.currentTimeMillis() - start;Metrics.record(inv.getChain().id(), cost);}}
}

3. 多环境支持

Solon Flow可以轻松集成到各种环境：

// Spring集成示例
@Configuration
public class SpringConfig {@Beanpublic FlowEngine flowEngine(ApplicationContext ctx) {FlowEngine engine = FlowEngine.newInstance();engine.register(new SimpleFlowDriver(new SpringAdapter(ctx)));engine.load("classpath:flows/**/*.yml");return engine;}
}// 原生Java环境
public class NativeApp {public static void main(String[] args) {FlowEngine engine = FlowEngine.newInstance();engine.load("file:conf/flows/*.json");engine.eval("main-flow");}
}

典型应用场景

1. 业务规则引擎

替代Drools等规则引擎，配置更简单：

id: "discount-rule"
layout:- { type: "start"}- { when: "user.level == 'VIP' && cart.total > 1000", task: "cart.discount = 0.2"}- { when: "user.level == 'VIP'", task: "cart.discount = 0.1"}- { when: "cart.total > 500", task: "cart.discount = 0.05"}- { type: "end"}

2. 计算任务编排

类似LiteFlow的编排能力，但风格很不同：

id: "data-pipeline"
layout:- { type: "start"}- { task: "@dataExtract"}- { task: "@dataTransform"}- { task: "@dataLoad"}- { type: "end"}

3. 审批流程管理

类似 Flowable 的效果。支持会签、或签等审批模式：

id: "contract-approval"
layout:- { type: "start", title: "发起合同", link: "finance"}- { id: "finance", type: "parallel", title: "财务会签", link: ["f1", "f2"]}- { id: "f1", type: "activity", title: "财务经理审批", meta: {role: "finance-mgr"}, link: "join"}- { id: "f2", type: "activity", title: "财务总监审批", meta: {role: "finance-dir"}, link: "join"}- { id: "join", type: "parallel", link: "legal"}- { id: "legal", type: "activity", title: "法务审核", meta: {role: "legal"}, link: "end"}- { type: "end"}