ViewandDataAPItips:缓存AccessToken

public class Util
{
    private static readonly ILog logger = LogManager.GetLogger(typeof(Util));
 
    string baseUrl = "";
    RestClient m_client;
 
    public static AccessToken token;
    public static DateTime issueDateTime;
    //refresh token if the token is about to expire in 5 seconds
    public static int ABOUT_EXPIRED_SECONDS = 5;
 
    public Util(string baseUrl)
    {
        this.baseUrl = baseUrl;
        m_client = new RestClient(baseUrl);
    }
 
    public AccessToken GetAccessToken(string clientId, string clientSecret)
    {
        //no token or token is going to be expired 
        // (less than ABOUT_EXPIRED_SECONDS)
 
        if (token == null
            || (DateTime.Now - issueDateTime).TotalSeconds
                > (token.expires_in - ABOUT_EXPIRED_SECONDS))
        {
            RestRequest req = new RestRequest();
            req.Resource = "authentication/v1/authenticate";
            req.Method = Method.POST;
            req.AddHeader("Content-Type", "application/x-www-form-urlencoded");
            req.AddParameter("client_id", clientId);
            req.AddParameter("client_secret", clientSecret);
            req.AddParameter("grant_type", "client_credentials");
            //avoid CORS issue, do not use this if you just need to get access token from same domain
            req.AddHeader("Access-Control-Allow-Origin", "*");
 
            IRestResponse resp = m_client.Execute(req);
            logger.Debug(resp.Content);
 
            if (resp.StatusCode == System.Net.HttpStatusCode.OK)
            {
                AccessToken ar = resp.Data;
                if (ar != null)
                {
                    token = ar;
 
                    //update the token issue time
                    issueDateTime = DateTime.Now;
 
 
                }
            }
            else
            {
 
                logger.Fatal("Authentication failed! clientId:" + clientId);
 
            }
 
        }
        else
        {
            ;//Do nothing, use the saved access token in static var 
        }
 
        return token;
    }
 
 
    }