public static BatchWriteItemResult FromJsonElement(JsonElement json)
{
var unprocessed = new List <TableRequests>();
/*
* if (json.TryGetValue("ConsumedCapacity", out var consumedCapacityNode)) // Array
* {
* foreach (var item in (JsonArray)consumedCapacityNode)
* {
* var unit = item.As<ConsumedCapacity>();
*
* // TODO
* }
* }
*/
if (json.TryGetProperty("UnprocessedItems", out var unprocessedItemsEl))
{
foreach (JsonProperty batch in unprocessedItemsEl.EnumerateObject())
{
unprocessed.Add(TableRequests.FromElementJson(batch.Name, batch.Value));
}
}
return(new BatchWriteItemResult {
UnprocessedItems = unprocessed
});
}
private async Task <BatchResult> PutBatch(IEnumerable <T> entities, BatchResult result)
{
#region Preconditions
if (entities == null)
{
throw new ArgumentNullException(nameof(entities));
}
#endregion
// Up to 25 items put or delete operations, with the request size not exceeding 1 MB.
var putRequests = entities
.Select(e => (ItemRequest) new PutRequest(AttributeCollection.FromObject(e, metadata)))
.ToList();
var tableBatch = new TableRequests(tableName, putRequests);
await BatchWriteItem(tableBatch, result).ConfigureAwait(false);
result.BatchCount++;
return(result);
}
public static BatchWriteItemResult FromJson(JsonObject json)
{
var unprocessed = new List <TableRequests>();
if (json.TryGetValue("ConsumedCapacity", out var consumedCapacityNode)) // Array
{
foreach (var item in (JsonArray)consumedCapacityNode)
{
var unit = DynamoDb.ConsumedCapacity.FromJson((JsonObject)item);
// TODO
}
}
if (json.TryGetValue("UnprocessedItems", out var unprocessedItemsNode))
{
foreach (var batch in (JsonObject)unprocessedItemsNode)
{
unprocessed.Add(TableRequests.FromJson(batch.Key, (JsonArray)batch.Value));
}
}
return(new BatchWriteItemResult {
UnprocessedItems = unprocessed
});
}
private async Task <BatchWriteItemResult> BatchWriteItem(TableRequests batch, BatchResult info)
{
#region Preconditions
if (batch == null)
{
throw new ArgumentNullException(nameof(batch));
}
if (batch.Requests.Count > 25)
{
throw new ArgumentException("Must be 25 or less.", "batch.Items");
}
#endregion
var retryCount = 0;
Exception lastError = null;
while (retryPolicy.ShouldRetry(retryCount))
{
try
{
var result = await client.BatchWriteItem(batch).ConfigureAwait(false);
info.ItemCount += batch.Requests.Count;
info.RequestCount++;
// Recursively process any item
foreach (var unprocessedBatch in result.UnprocessedItems)
{
await Task.Delay(100).ConfigureAwait(false); // Slow down
info.ItemCount -= unprocessedBatch.Requests.Count;
result = await BatchWriteItem(unprocessedBatch, info).ConfigureAwait(false);
}
return(result);
}
catch (DynamoDbException ex) when(ex.IsTransient)
{
lastError = ex;
}
retryCount++;
await Task.Delay(retryPolicy.GetDelay(retryCount)).ConfigureAwait(false);
}
throw lastError;
}
