private async Task UpdateCatalogAsync(CosmosBundleDocument bundle, CosmosCabinetDrawerChanges changes)
{
var updatedCatalogEntry = changes.UpdatedCatalogEntry;
if (updatedCatalogEntry != null)
{
await _repositoryContainer
.Catalog
.UpsertItemAsync(updatedCatalogEntry)
.ConfigureAwait(false);
return;
}
if (changes.UpdatedDrawer.Position == MaximumCabinetDrawerItemCount)
{
return;
}
var asLinq = _repositoryContainer
.Cabinet
.GetItemLinqQueryable <CosmosDataAvailable>();
var query =
from dataAvailable in asLinq
where dataAvailable.PartitionKey == changes.UpdatedDrawer.Id
orderby dataAvailable.SequenceNumber
select(long?) dataAvailable.SequenceNumber;
var nextSequenceNumber = await query
.Skip(changes.UpdatedDrawer.Position)
.Take(1)
.AsCosmosIteratorAsync()
.FirstOrDefaultAsync()
.ConfigureAwait(false);
if (!nextSequenceNumber.HasValue)
{
return;
}
var partitionKey = string.Join('_', bundle.Recipient, bundle.Origin);
var contentType = bundle.ContentType;
var nextCatalogEntry = new CosmosCatalogEntry
{
Id = Guid.NewGuid().ToString(),
PartitionKey = partitionKey,
ContentType = contentType,
NextSequenceNumber = nextSequenceNumber.Value,
};
await _repositoryContainer
.Catalog
.UpsertItemAsync(nextCatalogEntry)
.ConfigureAwait(false);
}
private async Task DeleteOldCatalogEntryAsync(CosmosBundleDocument bundle, CosmosCabinetDrawerChanges changes)
{
var asLinq = _repositoryContainer
.Catalog
.GetItemLinqQueryable <CosmosCatalogEntry>();
var partitionKey = string.Join('_', bundle.Recipient, bundle.Origin);
var contentType = bundle.ContentType;
var query =
from catalogEntry in asLinq
where catalogEntry.PartitionKey == partitionKey &&
catalogEntry.ContentType == contentType &&
catalogEntry.NextSequenceNumber == changes.InitialCatalogEntrySequenceNumber
select catalogEntry;
await foreach (var entry in query.AsCosmosIteratorAsync())
{
await DeleteOldCatalogEntryAsync(entry).ConfigureAwait(false);
}
}
private async Task UpdateDrawerAsync(CosmosCabinetDrawerChanges changes)
{
var options = new ItemRequestOptions
{
IfMatchEtag = changes.UpdatedDrawer.ETag
};
var updatedDrawer = changes.UpdatedDrawer;
try
{
await _repositoryContainer
.Cabinet
.ReplaceItemAsync(updatedDrawer, updatedDrawer.Id, requestOptions : options)
.ConfigureAwait(false);
}
catch (CosmosException ex) when(ex.StatusCode == HttpStatusCode.PreconditionFailed)
{
// When two Acknowledge are executing, they must not overwrite each others values.
// The failed ReplaceItemAsync is discarded.
}
}
