activiti 5.12中新增的动态bpmn模型部署

activiti是不错的工作流,最近发现5.12中可以通过在运行期间动态生成一个BPMN的流程模型,因为一般来说,是通过如activiti designer这样的工具,去画好一个BPMN图的,现在可以通过代码的方法去生成了.acitivti 核心工作组的老外提供了一个完整的DEMO来演示,

详细代码在:https://github.com/frederikheremans/activiti-dynamic-process中,

下面小结下,代码其实很简单,如下:

@Test

public void testDynamicDeploy() throws Exception {

//创建bpmn模型

BpmnModel model = new BpmnModel();

Process process = new Process();

model.addProcess(process);

process.setId("my-process");

//创建bpmn元素

process.addFlowElement(createStartEvent());

process.addFlowElement(createUserTask("task1", "First task", "fred"));

process.addFlowElement(createUserTask("task2", "Second task", "john"));

process.addFlowElement(createEndEvent());

process.addFlowElement(createSequenceFlow("start", "task1"));

process.addFlowElement(createSequenceFlow("task1", "task2"));

process.addFlowElement(createSequenceFlow("task2", "end"));

// 2.生成BPMN自动布局

new BpmnAutoLayout(model).execute();

// 3. 部署这个BPMN模型

Deployment deployment = activitiRule.getRepositoryService().createDeployment()

.addBpmnModel("dynamic-model.bpmn", model).name("Dynamic process deployment")

.deploy();

// 4. 启动流程实例

ProcessInstance processInstance = activitiRule.getRuntimeService()

.startProcessInstanceByKey("my-process");

// 5 发起任务

List tasks = activitiRule.getTaskService().createTaskQuery()

.processInstanceId(processInstance.getId()).list();

Assert.assertEquals(1, tasks.size());

Assert.assertEquals("First task", tasks.get(0).getName());

Assert.assertEquals("fred", tasks.get(0).getAssignee());

// 6. 保存bpmn流程图

InputStream processDiagram = activitiRule.getRepositoryService()

.getProcessDiagram(processInstance.getProcessDefinitionId());

FileUtils.copyInputStreamToFile(processDiagram, new File("target/diagram.png"));

// 7. 保存为bpmn.xml的xml类型文件

InputStream processBpmn = activitiRule.getRepositoryService()

.getResourceAsStream(deployment.getId(), "dynamic-model.bpmn");

FileUtils.copyInputStreamToFile(processBpmn,

new File("target/process.bpmn20.xml"));

}

//创建task

protected UserTask createUserTask(String id, String name, String assignee) {

UserTask userTask = new UserTask();

userTask.setName(name);

userTask.setId(id);

userTask.setAssignee(assignee);

return userTask;

}

//创建箭头

protected SequenceFlow createSequenceFlow(String from, String to) {

SequenceFlow flow = new SequenceFlow();

flow.setSourceRef(from);

flow.setTargetRef(to);

return flow;

}

protected StartEvent createStartEvent() {

StartEvent startEvent = new StartEvent();

startEvent.setId("start");

return startEvent;

}

protected EndEvent createEndEvent() {

EndEvent endEvent = new EndEvent();

endEvent.setId("end");

return endEvent;

}

其实上面的注解已经比较清楚了.首先是 BpmnModel model = new BpmnModel();

创建一个BPMN模型;然后Process process = new Process();这里创建一个process,

并把这个process加到bpmn模型中去,当然要设置其id了;

然后用 process.addFlowElement去不断创建BPMN中的每一个元素;

可以看到包括start,end,task,sequence等元素都可以通过new的方法分别创建;

并且用new BpmnAutoLayout(model).execute();对BPMN元素进行自动布局;

3,4,5部分则比较好理解了;6和7则都是生成BPMN的实际jpg图和生成实际的XML文件

最后会生成的BPMN图为: