Overview Introduction
Recently the company has a large project that needs to use the process engine platform. The service governance platform must provide process governance services, so the editor is stepping up the development of learning workflow engine. So what we are about to learn is a business process management framework, common open source workflow engine frameworks: OSWorkFlow, jBPM (jboss business process management), Activiti workflow (an upgrade to jBPM). The process development framework is generally called the workflow framework.
Why is activit recommended?
Activit is an open source, flexible, and easily extensible executable process language framework covering business process management, workflow, service collaboration and other fields. Activiti is based on the Apache-licensed open source BPM platform. The founder Tom Baeyens is the project architect of JBoss jBPM. It features an eclipse plug-in, through which developers can draw their business directly.In addition, I think it is relatively better than JBPM: No matter how simple it is, the development difficulty is reduced.
Technical Framework-Development Environment
- Language: Java 8
- IDE (JAVA): IDEA / Eclipse install activit plug-in
- IDE (front end): WebStorm or IDEA
- Dependency management: Maven
- Database: MySQL5.7
First example
Source download address, just copy and download
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.task.Task;
/**
* The first process running class
*/
public class First {
public static void main(String[] args) {
// Create process engine
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// Get the process storage service component
RepositoryService repositoryService = engine.getRepositoryService ();
// Get runtime service components
RuntimeService runtimeService = engine.getRuntimeService();
// Get process task component
TaskService taskService = engine.getTaskService();
// Deployment process file
repositoryService.createDeployment().addClasspathResource("bpmn/First.bpmn").deploy();
// start process
runtimeService.startProcessInstanceByKey("process1");
// Query the first task
Task task = taskService.createTaskQuery().singleResult();
System.out.println("Before the first task is completed, the current task name: "+ task.getName());
// Complete the first task
taskService.complete(task.getId());
// Query the second task
task = taskService.createTaskQuery().singleResult();
System.out.println("Before the second task is completed, the current task name: "+ task.getName());
// Complete the second task (end of process)
taskService.complete(task.getId());
task = taskService.createTaskQuery().singleResult();
System.out.println("After the process ends, find the task: "+ task);
// drop out
System.exit(0);
}
}
to sum up
Summary: To use activit, first create a process engine, get the process storage service component , get the runtime service component , deploy the process file and start the process.
This example is relatively simple, don't joke everyone.
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