/// <summary>
/// Refreshes if the prefix has timed out and/or the localkey has timed out.
/// Flushes all items if the time out has occurred
/// Returns true if data was retrieved
/// </summary>
/// </summary>
public static async Task <bool> WithTimedRefreshForPrefixAsync <T>(this IDataCache dataCache, bool allowStale, string prefixKey, string localKey, int maximumStaleSeconds, FetchedDelegate <T> onRefreshed, Action <bool> onRefreshing, Func <Task <T> > createMethod)
where T : class
{
TimedDataCacheFilter timeFilter = EnsureTimedLifetimeFilter(dataCache);
bool forceRefresh = (maximumStaleSeconds <= 0);
if (!forceRefresh)
{
// use the passed in time to override the default
forceRefresh = timeFilter.RefreshRequired(prefixKey, maximumStaleSeconds);
}
if (forceRefresh)
{
timeFilter.AddClearBeforeSave(localKey, prefixKey);
}
FetchedDelegate <T> onRefreshedWrapper = (freshData, data) =>
{
if (freshData)
{
dataCache.AddToCache(prefixKey, data);
timeFilter.OnAfterItemSavedToCache(dataCache, prefixKey, data);
}
if (onRefreshed != null)
{
onRefreshed(freshData, data);
}
};
return(await dataCache.WithRefreshAsync <T>(prefixKey + localKey, allowStale, forceRefresh, onRefreshedWrapper, onRefreshing, createMethod));
}
private ClrFunctionInstance WrapDelegate(FetchedDelegate _delegate)
{
return(Engine.AsJsFunction(new Func <JsValue, JsValue[], JsValue>((thisObject, args) => {
_delegate(((args[0].IsNull() || args[0].IsUndefined()) ? null : ManticoreException.NativeInstanceForObject(args[0].AsObject())), Engine.Converter.AsNativeObject(args[1]));
return JsValue.Undefined;
})));
}
} /**
* Fetch some JSON from httpbin.org
*/
public void GoFetch(FetchedDelegate callback)
{
JsValue[] args = new JsValue[] {
WrapDelegate(callback)
};
var func = this.impl.Get("goFetch").As <FunctionInstance>();
Engine.Js(() => {
func.Call(this.impl, args);
});
} /**
public static async Task <bool> WithTimedRefreshAsync <T>(this IDataCache dataCache, string key, int maximumStaleSeconds, FetchedDelegate <T> onRefreshed, Action <bool> onRefreshing, Func <Task <T> > createMethod)
where T : class
{
TimedDataCacheFilter timeFilter = EnsureTimedLifetimeFilter(dataCache);
bool forceRefresh = (maximumStaleSeconds <= 0);
bool allowStale = (maximumStaleSeconds != 0);
if (!forceRefresh)
{
// use the passed in time to override the default
forceRefresh = timeFilter.RefreshRequired(key, maximumStaleSeconds);
}
return(await dataCache.WithRefreshAsync <T>(key, allowStale, forceRefresh, onRefreshed, onRefreshing, createMethod));
}
private Action <dynamic, dynamic> WrapDelegate(FetchedDelegate _delegate)
{
return(new Action <dynamic, dynamic>((error, response) => {
_delegate((Engine.IsNullOrUndefined(error) ? null : ManticoreException.NativeInstanceForObject(error)), Engine.Converter.AsNativeObject(response));
}));
}
/**
* Fetch some JSON from httpbin.org
*/
public void GoFetch(FetchedDelegate callback)
{
Engine.Js(() =>
{ this.impl.goFetch(WrapDelegate(callback)); });
}
/// <summary>
/// Fetches scalar data with support for cached data and timeouts
/// </summary>
protected virtual Task <bool> FetchItemAsync <T>(bool allowStale, string cachePrefixKey, string cacheSpecificKey, int staleLimit, FetchedDelegate <ItemResult <T> > onFetched, Action <bool> onFetching, Func <Task <ItemResult <T> > > fetchMethod)
{
try
{
return(this.DataCache.WithTimedRefreshForPrefixAsync <ItemResult <T> >(allowStale, cachePrefixKey, cacheSpecificKey, staleLimit, onFetched, onFetching, async delegate()
{
return await fetchMethod();
}));
}
catch (Exception ex)
{
EndpointException endpointException = ex.FirstExceptionOfType <EndpointException>();
if (endpointException != null)
{
switch (endpointException.StatusCode)
{
case HttpStatusCode.BadRequest:
case HttpStatusCode.Unauthorized:
case HttpStatusCode.Forbidden:
case HttpStatusCode.NotFound:
case HttpStatusCode.RequestTimeout:
case HttpStatusCode.InternalServerError:
case HttpStatusCode.NotImplemented:
case HttpStatusCode.ServiceUnavailable:
this.ViewPlatform.ShowToast("Error connecting to server. Please check connection.");
break;
default:
break;
}
}
this.ProcessExecuteException(ex, "FetchItemAsync");
throw;
}
}
public Task <bool> WithRefreshAsync <T>(string key, bool allowStaleData, bool forceRefresh, FetchedDelegate <T> onRefreshed, Action <bool> onRefreshing, Func <Task <T> > createMethod)
where T : class
{
FetchedRequestDelegate <T> wrapper = null;
if (onRefreshed != null)
{
wrapper = (token, freshData, data) =>
{
onRefreshed(freshData, data);
};
}
return(this.WithRefreshAsync <T>(RequestToken.Empty, key, allowStaleData, forceRefresh, wrapper, onRefreshing, createMethod));
}
