/// <summary>
/// 获取缓存实例
/// </summary>
/// <returns></returns>
public static SimpleCacheProvider GetInstance()
{
if (_instance == null)
{
lock (_lockObj) { _instance = _instance ?? new SimpleCacheProvider(); }
}
; //使用单例模式以确保并发时实例始终是同一个
return(_instance);
}
/// <summary>
/// 获取JS票据
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static JSTicket FetchJSTicket()
{
var cache = SimpleCacheProvider.GetInstance();
var jsTicket = cache.GetCache <JSTicket>(ConstVars.CACHE_JS_TICKET_KEY);
if (jsTicket == null || AccessToken.Begin.AddSeconds(ConstVars.CACHE_TIME) < DateTime.Now) //jsTicket为null表示不存在或过期,或AccessToken过期
{
String apiurl = FormatApiUrlWithToken(Urls.get_jsapi_ticket); //该方法参看《钉钉开发系列(三)API的调用》
jsTicket = Analyze.Get <JSTicket>(apiurl);
cache.SetCache(ConstVars.CACHE_JS_TICKET_KEY, jsTicket, ConstVars.CACHE_TIME - 500); //增加500的时间差以防与AccessToken错位过期
}
return(jsTicket);
}