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。
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。
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。
- 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>
- 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
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.
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.
email: liyuliang5@jd.com