Calling API again if it returns HTTP 401.

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英文:

Calling API again if it returns Http 401

问题

I'm here to help with the translated code. Here's the translated version:

// 调用以下 API 使用 Jersey
JsonObject response = ConnectionUtil.getwebTarget()
    .request()
    .header("Authorization", "Bearer " + access_token)
    .get(JsonObject.class);

// 这里的 `accessToken` 是一个变量,通过调用另一个 API 获取其值。
// 现在,如果 response.getStatus() 返回 401,我想调用 API 获取令牌,然后再次执行上述命令。
// 我如何防止重复代码?
// 目前,我写了以下代码。

int statusCode = response.getStatus();
if (statusCode == 401) {
    accessToken = new AccessToken().getAccessToken();
    response = ConnectionUtil.getwebTarget()
        .request()
        .header("Authorization", "Bearer " + access_token)
        .get(JsonObject.class);
    statusCode = response.getStatus();
}

// 如何减少两次写 `JsonObject response` 的代码?我至少想在抛出自定义异常之前检查两次 401 状态码。
// 我是 `Java 编程` 新手。有人能告诉我逻辑吗?这是基本编码,但我仍然在努力。

Please note that I've translated the code as you requested. If you have any further questions or need assistance with the logic, feel free to ask!

英文:

I am calling below API using jersey

JsonObject response = ConnectionUtil.getwebTarget()
    		                            .request().
                 header("Authorization", "Bearer "+ access_token)
    						            .get(JsonObject.class);

Here accessToken is variable which got value by calling another API. Now if response.getStatus() returnd 401 I want to call the API to get token and will call the above commnad again. how can I stop myself from duplication?
As of now I am writing below code.

JsonObject response = ConnectionUtil.getwebTarget()
	    		                            .request().
                     header("Authorization", "Bearer "+ access_token)
	    						            .get(JsonObject.class);
  if(response.getStatus()==401)
  {
    accessToken= new AccessToken().getAccessToken();
    JsonObject response = ConnectionUtil.getwebTarget()
	    		                            .request()
                                            .header("Authorization", "Bearer "+ access_token)
	    						            .get(JsonObject.class);
}

how can I reduce writing the code of line JsonObject response twice. I atleast want to check twice 401 code before throwing customized exception

I am new to java programming. can somebody tell me logic. its basic coding but I am still struggling.

答案1

得分: 1

私有的JsonObject doRequest(AccessToken access_token) {
返回 ConnectionUtil.getwebTarget()
.request()
.header("Authorization", "Bearer " + access_token)
.get(JsonObject.class);
}

然后使用它两次:

JsonObject response = doRequest(access_token);
if (response.getStatus() == 401) {
access_token = new AccessToken().getAccessToken();
response = doRequest(access_token);
}

'doRequest' 可能不是最佳选择的名称,但我不知道整体情况是什么 - 即它实际上在做什么?

英文:

Write a subroutine.

private JsonObject doRequest(AccessToken access_token) {
    return ConnectionUtil.getwebTarget()
             .request()
             .header("Authorization", "Bearer "+ access_token)
             .get(JsonObject.class);
}

and then use it twice

JsonObject response = doRequest(access_token);
if (response.getStatus() == 401) {
    access_token = new AccessToken().getAccessToken();
    response = doRequest(access_token);
}

'doRequest' might not be the best name to choose, but I don't know what the big picture is - i.e., what is it actually doing?

答案2

得分: 1

这是一个适合使用do...while循环的好候选项。do...while循环保证至少执行一次,是实现这种重试语义的优秀的Java原生工具。

AccessToken accessToken;
JsonObject response;
int retryCount = 0;
final int MAX_RETRIES = 2;

do {
    accessToken = new AccessToken().getAccessToken();
    response = ConnectionUtil.getwebTarget().request().header("Authorization", "Bearer " + access_token).get(JsonObject.class);
} while (response.getStatus() == 401 && retryCount++ < MAX_RETRIES);

if (response.getStatus() == 401) {
    throw new CustomException("");
}

如果你想了解更多,可以查看这个参考链接

英文:

this is a good candidate for a do...while loop. do...while loops guarantee execution at least once, and are a great native java tool to implement this type of retry semantic.

AccessToken accessToken;
JsonObject response;
int retryCount = 0;
final int MAX_RETRIES = 2;

do {
    accessToken= new AccessToken().getAccessToken();
    response = ConnectionUtil.getwebTarget().request().header(&quot;Authorization&quot;, &quot;Bearer &quot;+ access_token).get(JsonObject.class);
} while (response.getStatus()==401 &amp;&amp; retryCount++ &lt; MAX_RETRIES);

if (response.getStatus() == 401) {
    throw new CustomException(&quot;&quot;);
}

Worth checking out this reference as well if you want to learn more

答案3

得分: 0

如果您正在寻找基于策略的重试方法,可以像这样操作:

RetryPolicy retryPolicy = new RetryPolicy()
  .retryIf((ClientResponse response) -> response.getStatus() == 401)
  .withDelay(1, TimeUnit.SECONDS)
  .withMaxRetries(3);

Failsafe.with(retryPolicy).get(() -> webResource.post(ClientResponse.class, input));
英文:

If you're looking for a policy based retry, you can do something like this.

RetryPolicy retryPolicy = new RetryPolicy()
  .retryIf((ClientResponse response) -&gt; response.getStatus() == 401)
  .withDelay(1, TimeUnit.SECONDS)
  .withMaxRetries(3);

Failsafe.with(retryPolicy).get(() -&gt; webResource.post(ClientResponse.class, input));

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  • 本文由 发表于 2020年8月1日 06:58:50
  • 转载请务必保留本文链接:https://go.coder-hub.com/63200072.html
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