java - 使用相同 REST 调用的不同操作

Question

我正在构建一个应用程序，它具有来自 AWS 和 Google Cloud 的相同功能。例如创建实例、从机器 ID 启动实例、创建快照、启动所有实例等。我使用 REST 调用调用它。例如:

<form method="post" action="rest/create/new" class="form-inline">
            <label for="user">User Name</label> <input type="text" id="user"
                name="user" class="form-control" size="50"
                placeholder="Enter Username">
            <button type="submit" class="btn btn-info">Start New Machine</button>
        </form>
        <form method="post" action="rest/launch/start" class="form-inline">
            <label for="AMId">Launch Existing Machine</label><br> <input
                type="text" id="AMId" name="AMId" class="form-control" size="50"
                placeholder="Enter Instance ID">
            <button type="submit" class="btn btn-info">Launch</button>
            <br>
        </form>
        <br> <br>

        <form method="get" action="rest/create/listAll" class="form-inline">
            <label>Show All EC2 Instances</label><br>
            <button type="submit" class="btn btn-info btn-lg">Show All</button>
        </form>
        <br> <br>

        <form method="post" **action="rest/create/listRunning"**>
            <label>Show All Running EC2 Instances</label><br>
            <button type="submit" class="btn btn-info">Show All Running</button>
        </form>
        <br> <br>

        <form method="post" action="rest/create/terminate" class="form-inline">
            <label for="terminateID">Enter Instance ID</label><br> <input
                type="text" id="terminateID" name="terminateID" class="form-control"
                size="50" placeholder="Enter Machine ID">
            <button type="submit" class="btn btn-info">Terminate</button>
        </form>
        <br> <br>

我在类里面接听这些休息电话。例如，

@GET
    @Path("/listAll")
    public Response getAllAvailableImages(@Context ServletContext context)

现在我想要的是如何根据要求或选择使用这些相同的调用或其他方法来同时使用 AWS 和谷歌云功能？

Answer 1

怎么样:

GET /{provider}/images
POST /{provider}/images/{imageID}/start

其中大括号中的变量是路径参数的占位符:

{provider} 可能解析为 AWS、Google 或其他提供商

{imageID} 引用一个唯一的图像 ID

例子:

GET /AWS/images   (gets all AWS images)
POST /GoogleCloud/images  (creates new Google Cloud image)
POST /OpenStack/images/gfhdh45ff4/terminate  (terminates a specific image)

如果您使用 Spring MVC for REST， Controller 可能如下所示:

@RestController
public class ImageController {

    @Autowired
    private ImageService imageService;

    @RequestMapping(value = "/{provider}", method = RequestMethod.GET)
    @ResponseStatus(HttpStatus.OK)
    public List<Image> getImages(@PathVariable String provider) {
        return imageService.getImagesByProvider(provider);
    }

    @RequestMapping(value = "/{provider}", method = RequestMethod.POST)
    @ResponseStatus(HttpStatus.CREATED)
    public Image createNewImage(@PathVariable String provider, @RequestBody Image image) {
        return imageService.createImageForProvider(provider, image);
    }

    @RequestMapping(value = "/{provider}/images/{imageId}/start", method = RequestMethod.PUT)
    @ResponseStatus(HttpStatus.NO_CONTENT)
    public void startImageAtProvider(@PathVariable String provider, @PathVariable String imageId) {
        return imageService.startImageAtProvider(provider, imageId);
    }

}

用于启动图像的 HTTP 方法可以是 POST - 如果启动图像不是幂等的，则应该是。但我假设 hat 试图启动一个已经在运行的图像将被忽略。

额外编辑:

如果图像 ID 在所有提供者中都是唯一的，您可以缩短有关图像的 REST URL:

POST /images/gfhdh45ff4/terminate  (terminates a specific image)