public static Task <T> CachedQuery <T>(this DataSource datasource, OfflineCacheEnumeration type, TimeSpan?optionalTimeSpan = null)
{
var query = datasource.Query();
var manager = new OfflineCache(targetdirectory, datasource.dsname, DataSourceServiceName);
if (optionalTimeSpan != null)
{
manager.Expiration = optionalTimeSpan.Value;
}
var task = manager.TaskManager(query, type);
return(Task.Factory.StartNew <T>(() => {
var result = JsonConvert.DeserializeObject <T>(task.Result);
return result;
}));
}
public Task <string> RequestQueueManager <T>(Task <string> apitask, T parameters, OfflineCacheEnumeration offlineType)
{
if (offlineType == OfflineCacheEnumeration.NetworkElseLocal)
{
return(apitask.ContinueWith(
task => {
if (task.IsFaulted)
{
var request = JsonConvert.SerializeObject(parameters);
return this.queueRequest(request);
}
else
{
Task.Factory.StartNew(() => {
processPending();
});
return task;
}
}
).Result);
}
else
{
throw new NotImplementedException();
}
}
public Task <string> TaskManager(Task <string> apitask, OfflineCacheEnumeration offlineType)
{
if (offlineType == OfflineCacheEnumeration.NetworkElseLocal)
{
Console.WriteLine("OfflineCacheEnumeration.NetworkElseLocal");
return(apitask.ContinueWith(
task => {
if (task.IsFaulted)
{
Console.WriteLine("Network fault, going to cache");
var result = this.getAsTask().Result;
if (result.Item1) //expired
{
Console.WriteLine("Invalid, has expired");
System.IO.File.Delete(getFullFilePath());
throw new Exception("Cache data has expired.");
}
else
{
Console.WriteLine("Valid! return data from cache");
return result.Item2;
}
}
else
{
Console.WriteLine("Valid! return data from Network");
this.save(task.Result);
return task.Result;
}
}
));
}
else if (offlineType == OfflineCacheEnumeration.LocalElseNetwork)
{
Console.WriteLine("OfflineCacheEnumeration.LocalElseNetwork");
return(this.getAsTask().ContinueWith(
task => {
if (task.IsFaulted)
{
Console.WriteLine("Cache fault, going to network");
this.save(apitask.Result);
return apitask.Result;
}
else
{
var result = task.Result;
if (result.Item1) //expired
{
System.IO.File.Delete(getFullFilePath());
this.save(apitask.Result);
Console.WriteLine("Invalid, has expired");
Console.WriteLine("Going to network");
return apitask.Result;
}
else
{
return result.Item2;
}
}
}
));
}
else if (offlineType == OfflineCacheEnumeration.NetworkOnly)
{
return(apitask.ContinueWith(
task => {
if (task.IsFaulted)
{
throw task.Exception;
}
else
{
this.save(task.Result); // updates local cache
return task;
}
}
).Result);
}
else
{
return(apitask);
}
}
