/// <summary>
/// Reads the BLOB, updates the Redis Cache in bulk manner based on batch size.
/// </summary>
/// <param name="myBlob">BLOB Stream reference</param>
/// <param name="redisCacheHelper">Redis Cache loader helper</param>
/// <param name="batchSize">batch size for bulk load</param>
/// <returns></returns>
private static async Task <int> ReadBlobAndUpdateRedisCache(Stream myBlob, RedisCacheHelper redisCacheHelper, int batchSize)
{
int keysWrittenToCache = 0;
/* Read contents of the updated BLOB */
using (var reader = new StreamReader(myBlob))
{
var counter = 0;
var batch = new Dictionary <string, string>();
while (!reader.EndOfStream)
{
// assuming data format of xxxx,yyyyy
var line = reader.ReadLine()?.Split(new char[] { ',' });
/* Ignore lines which could not be read or do not have at least one delimiter. */
if (line != null && line.Length > 1)
{
batch.Add(line[0], line[1]);
counter++;
}
/* if the read count has reached batch size, write the key-value pair to Redis Cache
* clear the batch and reset the read counter.
*/
if (counter == batchSize)
{
await redisCacheHelper.BatchWriteKeyValuePairAsync(batch);
keysWrittenToCache += counter;
counter = 0;
batch.Clear();
}
}
/*
* if items are still left in the batch, as count could not meet
* the batch size, write remaining key-value pair to Redis Cache.
*/
if (batch.Count > 0)
{
await redisCacheHelper.BatchWriteKeyValuePairAsync(batch);
keysWrittenToCache += batch.Count;
batch.Clear();
}
}
return(keysWrittenToCache);
}
