async Task InitializeAsync()
{
this.documentClient = new DocumentClient(this.collectionLocation.Uri, this.collectionLocation.MasterKey, this.collectionLocation.ConnectionPolicy);
Uri databaseUri = UriFactory.CreateDatabaseUri(this.collectionLocation.DatabaseName);
Database database = await this.documentClient.ReadDatabaseAsync(databaseUri);
Uri collectionUri = UriFactory.CreateDocumentCollectionUri(this.collectionLocation.DatabaseName, this.collectionLocation.CollectionName);
ResourceResponse <DocumentCollection> collectionResponse = await this.documentClient.ReadDocumentCollectionAsync(
collectionUri,
new RequestOptions { PopulateQuotaInfo = true });
DocumentCollection collection = collectionResponse.Resource;
this.collectionSelfLink = collection.SelfLink;
// Grab the options-supplied prefix if present otherwise leave it empty.
string optionsPrefix = this.options.LeasePrefix ?? string.Empty;
// Beyond this point all access to collection is done via this self link: if collection is removed, we won't access new one using same name by accident.
this.leasePrefix = string.Format(CultureInfo.InvariantCulture, "{0}{1}_{2}_{3}", optionsPrefix, this.collectionLocation.Uri.Host, database.ResourceId, collection.ResourceId);
var leaseManager = new DocumentServiceLeaseManager(
this.auxCollectionLocation,
this.leasePrefix,
this.options.LeaseExpirationInterval,
this.options.LeaseRenewInterval);
await leaseManager.InitializeAsync();
this.leaseManager = leaseManager;
this.checkpointManager = (ICheckpointManager)leaseManager;
if (this.options.DiscardExistingLeases)
{
TraceLog.Warning(string.Format("Host '{0}': removing all leases, as requested by ChangeFeedHostOptions", this.HostName));
await this.leaseManager.DeleteAllAsync();
}
// Note: lease store is never stale as we use monitored colleciton Rid as id prefix for aux collection.
// Collection was removed and re-created, the rid would change.
// If it's not deleted, it's not stale. If it's deleted, it's not stale as it doesn't exist.
await this.leaseManager.CreateLeaseStoreIfNotExistsAsync();
var ranges = new Dictionary <string, PartitionKeyRange>();
foreach (var range in await this.EnumPartitionKeyRangesAsync(this.collectionSelfLink))
{
ranges.Add(range.Id, range);
}
TraceLog.Informational(string.Format("Source collection: '{0}', {1} partition(s), {2} document(s)", this.collectionLocation.CollectionName, ranges.Count, GetDocumentCount(collectionResponse)));
await this.CreateLeases(ranges);
this.partitionManager = new PartitionManager <DocumentServiceLease>(this.HostName, this.leaseManager, this.options);
await this.partitionManager.SubscribeAsync(this);
await this.partitionManager.InitializeAsync();
}
async Task InitializeAsync()
{
this.documentClient = new DocumentClient(this.collectionLocation.Uri, this.collectionLocation.MasterKey, this.collectionLocation.ConnectionPolicy);
Uri databaseUri = UriFactory.CreateDatabaseUri(this.collectionLocation.DatabaseName);
Database database = await this.documentClient.ReadDatabaseAsync(databaseUri);
Uri collectionUri = UriFactory.CreateDocumentCollectionUri(this.collectionLocation.DatabaseName, this.collectionLocation.CollectionName);
DocumentCollection collection = await this.documentClient.ReadDocumentCollectionAsync(collectionUri);
this.collectionSelfLink = collection.SelfLink;
// Beyond this point all access to colleciton is done via this self link: if collection is removed, we won't access new one using same name by accident.
this.leasePrefix = string.Format(CultureInfo.InvariantCulture, "{0}_{1}_{2}", this.collectionLocation.Uri.Host, database.ResourceId, collection.ResourceId);
var leaseManager = new DocumentServiceLeaseManager(
this.auxCollectionLocation,
this.leasePrefix,
this.options.LeaseExpirationInterval,
this.options.LeaseRenewInterval);
await leaseManager.InitializeAsync();
this.leaseManager = leaseManager;
this.checkpointManager = (ICheckpointManager)leaseManager;
if (this.options.DiscardExistingLeases)
{
TraceLog.Warning(string.Format("Host '{0}': removing all leases, as requested by ChangeFeedHostOptions", this.HostName));
await this.leaseManager.DeleteAllAsync();
}
// Note: lease store is never stale as we use monitored colleciton Rid as id prefix for aux collection.
// Collection was removed and re-created, the rid would change.
// If it's not deleted, it's not stale. If it's deleted, it's not stale as it doesn't exist.
await this.leaseManager.CreateLeaseStoreIfNotExistsAsync();
string[] rangeIds = await this.EnumPartitionKeyRangeIds(this.collectionSelfLink);
Parallel.ForEach(rangeIds, async rangeId => {
this.statsSinceLastCheckpoint.AddOrUpdate(
rangeId,
new CheckpointStats(),
(partitionId, existingStats) => existingStats);
await this.leaseManager.CreateLeaseIfNotExistAsync(rangeId);
});
this.partitionManager = new PartitionManager <DocumentServiceLease>(this.HostName, this.leaseManager, this.options);
await this.partitionManager.SubscribeAsync(this);
await this.partitionManager.InitializeAsync();
}