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JDEasyFlow

介绍

JDEasyFlow是一款通用流程编排组件, 适用于服务编排、工作流、任务审批等场景。它的特点是简单、灵活、易扩展。开发人员30分钟可入门上手，半天可掌握其原理。

软件架构

JDEasyFlow底层为流程引擎/状态机模块(使用时选一便可，建议优先使用流程引擎)，此模块提供了基于JSON格式的JDEasyFlow规范进行流程编排的能力。

BPMN模块提供了基于BPMN规范进行流程定义和可视化的能力，流程可视化基于bpmn-js，其本质为提供了将BPMN格式流程定义转换为JDEasyFlow格式的能力。

使用说明

在源码的test目录下有quickstart测试用例，可直接运行或调试以了解使用方式和运行原理。

流程引擎

  1. 代码中引入easyflow-flow jar包，以maven为例:
    <dependency>
        <groupId>com.jd.easyflow</groupId>
        <artifactId>easyflow-flow</artifactId>
        <version>{latestVersion}</version>
    </dependency>
  1. 编写流程定义文件 以node001->node002->node003的执行顺序为例:
{"id": "quickstart_001", "name": "Quick Start 001",
"nodes": [
  {"id": "node001","name": "Node001","action": {"createExp": "new com.jd.easyflow.flow.quickstart.QuickStart001Node01Action()"},"start": true,"post": {"to": "node002"}},
  {"id": "node002","name": "Node002","action": {"createExp": "new com.jd.easyflow.flow.quickstart.QuickStart002Node01Action()"},"post": {"to": "node003"}},
  {"id": "node003","name": "Node003","action": {"createExp": "new com.jd.easyflow.flow.quickstart.QuickStart003Node01Action()"}}
]
}

其中QuickStart001Node01Action等为java节点动作类 3. 编写应用启动时加载流程引擎的代码

        FlowEngineImpl flowEngine = new FlowEngineImpl();
        flowEngine.setFlowPath("classpath:flow/quickstart/quickstart_001.json");
        flowEngine.init();

Spring环境可直接定义FlowEngineImpl bean.
4. 编写具体流程调用执行的代码

       FlowParam param = new FlowParam("quickstart_001");
        FlowResult result = flowEngine.execute(param);

日志打印结果如下:

[main            ] INFO  FlowEngineImpl          - Start parsing definition files:easyflow-flow/target/test-classes/flow/quickstart/quickstart_001.json
[main            ] INFO  FlowEngineImpl          - SART EXECUTE FLOW, flowId:quickstart_001 nodeIds:null
[main            ] INFO  BaseFlowRunner          - EXECUTE NODE:node001
[main            ] INFO  QuickStart001Node01Action  - Execute Node 001
[main            ] INFO  BaseFlowRunner          - NEXT NODES:node002
[main            ] INFO  BaseFlowRunner          - EXECUTE NODE:node002
[main            ] INFO  QuickStart002Node01Action  - Execute Node 002
[main            ] INFO  BaseFlowRunner          - NEXT NODES:node003
[main            ] INFO  BaseFlowRunner          - EXECUTE NODE:node003
[main            ] INFO  QuickStart003Node01Action  - Execute Node 003
[main            ] INFO  BaseFlowRunner          - NEXT NODES:
[main            ] INFO  QuickStartTest          - Execute finish, current node is:node003

流程引擎-BPMN

打开easyflow-flow-bpmn/BPMNDesigner.html流程设计器. 点击导入按钮，导入easyflow-flow-bpmn/src/test/resources/flow/quickstart/quickstart_001.bpmn文件，可在设计器中看到和以上JSON定义等价的BPMN流程定义. 使用时只需要将FlowEngineImpl的flowParser设置为BpmnFlowParser.

更多

以上只是简单使用示例，EasyFlow可支持很多的配置项和使用场景，更多使用见wiki文档.

JDEasyFlow具有非常灵活的扩展性，你可以基于目前已开源组件做更多的功能，如流程持久化、任务审批等.

联系我们

email: [email protected] [email protected]