请求所有文件时如何避免读取超时？（Google Drive API）

Question

我有一个驱动器应用程序，该应用程序请求所有未被回收的文件。但是有时它会抛出带有读取超时的IOexception。有办法避免这种情况吗？

这是我得到的错误：

发生错误：java.net.SocketTimeoutException：读取超时

也许我的指数补偿实施错误。

这是我用来获取文件的代码：

private static List<File> retrieveAllNoTrashFiles(Drive service) throws IOException, InterruptedException {
    List<File> result = new ArrayList<File>();
    Files.List request = service.files().list().setQ("trashed = false").setMaxResults(1000);
    do {
        try {
            FileList files =executeRequest(service,request);
            result.addAll(files.getItems());
            request.setPageToken(files.getNextPageToken());
        } catch (IOException e) {       //here I sometimes get the read timeout
            System.out.println("An error occurred: " + e);
            request.setPageToken(null);
        }
    } while (request.getPageToken() != null
            && request.getPageToken().length() > 0);

    return result;
}

private static FileList executeRequest(Drive service,Files.List request) throws IOException, InterruptedException {
    Random randomGenerator = new Random();
    for (int n = 0; n < 5; ++n) {
        try {
            return(request.execute());
        } catch (GoogleJsonResponseException e) {
            if (e.getDetails().getCode() == 403
                    && (e.getDetails().getErrors().get(0).getReason().equals("rateLimitExceeded")
                    || e.getDetails().getErrors().get(0).getReason().equals("userRateLimitExceeded"))) {
                // Apply exponential backoff.
                Thread.sleep((1 << n) * 1000 + randomGenerator.nextInt(1001));
            } 
             //else {
                // Other error, re-throw.
               // throw e;
           // }
        }
    }catch(SocketTimeoutException e){
            Thread.sleep((1 << n) * 1000 + randomGenerator.nextInt(1001));
        }
    System.err.println("There has been an error, the request never succeeded.");
    return null;
}

Answer 1

几天前我也有同样的经历。在这里找到了我的问题的答案。https://code.google.com/p/google-api-java-client/wiki/FAQ。创建云端硬盘实例时，可以调用setHttpRequestInitilalizer方法，将新的HttpRequestInitializer实例作为参数传递，并实现initialize方法。在其中，您可以增加ReadTimeout和ConnectionTimeout。

这是一个示例代码：

         Drive drive = new Drive.Builder(this.httpTransport, this.jsonFactory, this.credential).setHttpRequestInitializer(new HttpRequestInitializer() {

            @Override
            public void initialize(HttpRequest httpRequest) throws IOException {

                credential.initialize(httpRequest);
                httpRequest.setConnectTimeout(300 * 60000);  // 300 minutes connect timeout
                httpRequest.setReadTimeout(300 * 60000);  // 300 minutes read timeout

            }
        }).setApplicationName("My Application").build();