private static async Task SaveTracking(int offSet, int limit, string lastKey)
{
var context = GetContext();
var tracking = new TrackingOffset {
PartitionKey = $"ppham_{offSet}_{limit}", SortKey = $"ppham_{offSet}_{limit}", LastKey = lastKey
};
await context.SaveAsync(tracking, new DynamoDBOperationConfig()
{
OverrideTableName = TABLE
});
}
private async static Task <List <MyPoc> > GetWithOffsetAndLimit(int offSet, int limit)
{
if (offSet != 0)
{
TrackingOffset tracking = await GetTracking(offSet, limit);
if (tracking == null)
{
Console.WriteLine("Please start from Offset zero.");
return(null);
}
// Set tracking.Expiration = some config seconds
//tracking.Expiration is valid ??
var enrollments = await GetWithLastKey(tracking.LastKey);
if (enrollments.Count >= LIMIT)
{
await SaveTracking(offSet, limit, enrollments[LIMIT - 1].SortKey);
return(enrollments.Take(LIMIT).ToList());
}
else
{
return(enrollments);
}
}
else
{
var enrollments = await GetWithLimit(LIMIT);
if (enrollments.Count >= LIMIT)
{
await SaveTracking(offSet, limit, enrollments[LIMIT - 1].SortKey);
return(enrollments.Take(LIMIT).ToList());
}
else
{
return(enrollments);
}
}
}