public static async Task EnqueueBlobReplicationAsync(NamespaceBlob namespaceBlob, bool deleteReplica, bool saveNamespaceEntry = true)
{
if (!await namespaceBlob.ExistsAsync())
{
return;
}
// Trim down the namespace replication list to the first 'master' item. This is sufficient to ensure that the
// orphaned blobs are not effectively in the account. The master blob will be replicated over the top of the
// orphaned blobs.
string primaryAccount = namespaceBlob.PrimaryAccountName;
if (namespaceBlob.IsReplicated)
{
namespaceBlob.PrimaryAccountName = primaryAccount;
if (saveNamespaceEntry)
{
await namespaceBlob.SaveAsync();
}
}
// This rest of this method does not block. Enqueueing the replication is a completely async process
var task = Task.Factory.StartNew(() =>
{
var queue = new AzureMessageQueue();
var tasks = DashConfiguration.DataAccounts
.Where(dataAccount => !dataAccount.Credentials.AccountName.Equals(primaryAccount, StringComparison.OrdinalIgnoreCase))
.Select(async dataAccount => await queue.EnqueueAsync(ConstructReplicationMessage(deleteReplica,
primaryAccount,
dataAccount.Credentials.AccountName,
namespaceBlob.Container,
namespaceBlob.BlobName,
deleteReplica ? await GetBlobETagAsync(dataAccount, namespaceBlob.Container, namespaceBlob.BlobName) : null)));
Task.WhenAll(tasks)
.ContinueWith(antecedent =>
{
if (antecedent.Exception != null)
{
DashTrace.TraceWarning("Error queueing replication message for blob: {0}. Details: {1}",
PathUtils.CombineContainerAndBlob(namespaceBlob.Container, namespaceBlob.BlobName),
antecedent.Exception.Flatten());
}
else
{
DashTrace.TraceInformation("Blob: {0} has been enqueued for replication.",
PathUtils.CombineContainerAndBlob(namespaceBlob.Container, namespaceBlob.BlobName));
}
});
});
}
