ServiceTask使用外部Java应用程序

• • • • 创建流程图payment.bpmn
      • 创建Maven项目实现Java应用程序
      • 启动Camunda Cloud Run
      • 部署流程并启动流程实例
      • 参考资料

• Start Event
  Name：收到付款请求
  
• Service Task
  Name：信用卡收款
  将该任务设置为Service Task，然后将Implementation设置为External，Topic：charge-card。
  
• End Event
  Name：收到付款
  
• payment.bpmn
  点击任意空白处，设置流程图的Id、Name，勾选Executable。
  Id：payment-retrieval
  Name：收款
  最后将将文件另存为payment.bpmn。
  

pom文件中添加依赖，pom.xml的内容如下，

    4.0.0

    org.camunda.bpm.getstarted
    charge-card-worker
    1.0-SNAPSHOT

    
        8
        8
        7.16.0
    

    
        
            org.camunda.bpm
            camunda-external-task-client
            ${camunda.external-task-client.version}
        
        
            org.slf4j
            slf4j-simple
            1.6.1
        
        
            javax.xml.bind
            jaxb-api
            2.3.1
        
    

创建启动类org.camunda.bpm.getstarted.chargecard.ChargeCardWorker，内容如下，

package org.camunda.bpm.getstarted.chargecard;


import org.camunda.bpm.client.ExternalTaskClient;

import java.util.logging.Logger;

public class ChargeCardWorker {
    private final static Logger LOGGER = Logger.getLogger(ChargeCardWorker.class.getName());
    public static void main(String[] args) {
        ExternalTaskClient client = ExternalTaskClient.create().baseUrl("http://localhost:8080/engine-rest")
                .asyncResponseTimeout(10000)
                .build();
        client.subscribe("charge-card").lockDuration(1000)
                .handler((externalTask, externalTaskService) -> {
                    String item = (String) externalTask.getVariable("item");
                    Long amount = (Long) externalTask.getVariable("amount");
                    LOGGER.info(
                            "Charging credit card with an amount of '"+amount+"€' for the item '"+item+"'..."
                    );
                    externalTaskService.complete(externalTask);
                }).open();

    }
}

运行ChargeCardWorker#main，启动Java应用。

https://docs.camunda.org/get-started/quick-start/service-task/
https://docs.camunda.org/get-started/quick-start/deploy/