Spring Boot 项目集成 Camunda 流程引擎学习记录

import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.RepositoryService;
import org.camunda.bpm.engine.RuntimeService;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
 
@Service
public class WorkflowService {
 
    private final ProcessEngine processEngine;
    private final RepositoryService repositoryService;
    private final RuntimeService runtimeService;
 
    @Autowired
    public WorkflowService(ProcessEngine processEngine) {
        this.processEngine = processEngine;
        this.repositoryService = processEngine.getRepositoryService();
        this.runtimeService = processEngine.getRuntimeService();
    }
 
    public List<String> getDeployedProcessDefinitions() {
        return repositoryService.createProcessDefinitionQuery().orderByProcessDefinitionName().asc().list()
                .stream().map(pd -> pd.getKey() + " : " + pd.getName()).toList();
    }
 
    public void startProcessInstance(String processDefinitionKey) {
        ProcessInstance pi = runtimeService.startProcessInstanceByKey(processDefinitionKey);
        System.out.println("Process instance started. ID: " + pi.getId());
    }
}

这段代码演示了如何在Spring Boot项目中集成Camunda工作流程引擎。首先，通过@Autowired注解注入ProcessEngine，然后通过ProcessEngine获取RepositoryService和RuntimeService。getDeployedProcessDefinitions方法用于获取所有已部署的流程定义，并以流的方式映射键和名称。startProcessInstance方法用于根据流程定义的键启动一个新的流程实例。