Android okHttp重试策略

Question

private InputStream callServer() throws ServerException, NoNetworkAvailableException, ConnectionErrorException {
        NetworkOperation networkOperation = getNetworkOperation();
        InputStream inputStream = null;
        //in case of network problems we will retry 3 times separated by 5 seconds before gave up
        while (connectionFailedRetryCounter < connectionFailedMaximumAllowedRetries()) {
            connectionFailedRetryCounter++;
            try {
                inputStream = networkOperation.execute();
                break;//if this line was reached it means a successfull operation, no need to retry .
            } catch (ConnectionErrorException e) {
                if (canRetryToConnect()) {
                    Utils.forceSleepThread(Constants.Communications.ConnectionFailedTrialCounter.SLEEP_BETWEEN_REQUESTS_MILLI);//retry after 5 secs (Thread.sleep)
                } else {
                    throw e;//I give up
                }
            }

        }
        return inputStream;

    }

    private boolean canRetryToConnect() {
        return (connectionFailedRetryCounter < connectionFailedMaximumAllowedRetries()) && !canceled;
    }

下面是execute（）方法所做的事情

public InputStream execute() throws ConnectionErrorException, NoNetworkAvailableException, ServerException {

    if (!Utils.isNetworkAvailable(context)) {
        throw new NoNetworkAvailableException();
    }

    Response response = doExecute();

    if (!response.isSuccessful()) {
        throw new ServerException(response.code());
    }

    return response.body().byteStream();
}

private Response doExecute() throws ConnectionErrorException {
    Response response;
    try {
        if (getRequestType() == RequestType.GET) {
            response = executeGet();
        } else {
            response = executePost();
        }
    } catch (IOException e) {
        throw new ConnectionErrorException();
    }
    return response;
}

Answer 1

如果捕获NonetWorkAvailableException，则可以避免重试。如果您知道以下尝试无论如何都会失败，请不要重试。

我将ConnectionFailedMaximumAllowedRetries()设置为常量。我怀疑你需要在任何时候改变变量。

实现指数后退。你可以让它重试10次。每次，您将延迟乘以2（上限为几分钟）。例如：

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