ballerina 学习一 基本项目安装试用

ballerina介绍

   建议参考这篇文章： https://mp.weixin.qq.com/s/DqdlOhquqMaGOJf26lANPw

 

1. 安装

直接下载对应操作系统的二进制文件即可，同时官方也提供了linux 操作系统对应的各种发行包（deb, rpm）

参考地址：
https://ballerina.io/downloads/

2. 基本代码

// Packages contain functions, annotations and connectors.
// This package is referenced by ‘http’ namespace in the code
// body.
import ballerina/http;
import ballerina/io;

// A service is a network-accessible API. This service
// is accessible at '/hello', and bound to a the listener on
// port 9090. `http:Service`is a connector in the `http`
// package.
service<http:Service> hello bind { port: 9090 } {

  // A resource is an invokable API method.
  // Accessible at '/hello/sayHello’.
  // 'caller' is the client invoking this resource.
  sayHello (endpoint caller, http:Request request) {

    // Create object to carry data back to caller.
    http:Response response = new;

    // Objects have function calls.
    response.setTextPayload("Hello Ballerina!\n");

    // Send a response back to caller.
    // Errors are ignored with '_'.
    // ‘->’ is a synchronous network-bound call.
    _ = caller -> respond(response);
  }
}
备注：第一眼看上去，代码还是很清晰的，也比较简单，比较完整的代码可以参考
https://github.com/ballerina-platform/ballerina-examples

3. 运行

ballerina  run  app.bal

备注： 很简单，就是可能启动会稍微有点慢

4. 访问

上面的代码已经说明了访问方式
http://hostip:port(9090)/hello/sayHello

结果：

HTTP/1.1 200 OK
content-type: text/plain
content-length: 17
server: ballerina/0.970.1
date: Mon, 14 May 2018 10:01:38 +0800

Hello Ballerina!

5. 总结

从官方介绍的特性来说还是很不错的，同时开发团队也提供了主流编辑器的可用插件，vscode idead 。。。
开发也比较简单，总的来说还是比较看好，具体的性能测试，目前暂时没有看到相关的结果，比较期待。

6. 参考资料

https://github.com/rongfengliang/ballerina-basic-demo
https://github.com/ballerina-platform/ballerina-examples
https://ballerina.io/