/// <summary>
/// Registers a change feed observer to update changes read on
/// change feed to destination collection. Deregisters change feed
/// observer and closes process when enter key is pressed
/// </summary>
/// <returns>A Task to allow asynchronous execution</returns>
private async Task RunChangeFeedHostAsync()
{
string monitoredUri = ConfigurationManager.AppSettings["CosmosDBEndpointUri"];
string monitoredSecretKey = ConfigurationManager.AppSettings["CosmosDBAuthKey"];
string monitoredDbName = ConfigurationManager.AppSettings["DatabaseName"];
string monitoredContainerName = ConfigurationManager.AppSettings["ContainerName"];
// Source collection to be monitored for changes
DocumentCollectionInfo documentCollectionInfo = new DocumentCollectionInfo
{
Uri = new Uri(monitoredUri),
MasterKey = monitoredSecretKey,
DatabaseName = monitoredDbName,
CollectionName = monitoredContainerName
};
string leaseUri = ConfigurationManager.AppSettings["LeaseUri"];
string leaseSecretKey = ConfigurationManager.AppSettings["LeaseSecretKey"];
string leaseDbName = ConfigurationManager.AppSettings["LeaseDbName"];
string leaseContainerName = ConfigurationManager.AppSettings["LeaseContainerName"];
// Lease Collection managing leases on each of the underlying shards of the source collection being monitored
DocumentCollectionInfo leaseContainerInfo = new DocumentCollectionInfo
{
Uri = new Uri(leaseUri),
MasterKey = leaseSecretKey,
DatabaseName = leaseDbName,
CollectionName = leaseContainerName
};
DocumentFeedObserverFactory docObserverFactory = new DocumentFeedObserverFactory(this.DocumentClient);
ChangeFeedProcessorOptions feedProcessorOptions = new ChangeFeedProcessorOptions();
int feedPollDelayInSeconds = int.Parse(ConfigurationManager.AppSettings["FeedPollDelayInSeconds"]);
feedProcessorOptions.LeaseRenewInterval = TimeSpan.FromSeconds(240);
feedProcessorOptions.LeaseExpirationInterval = TimeSpan.FromSeconds(240);
feedProcessorOptions.FeedPollDelay = TimeSpan.FromMilliseconds(feedPollDelayInSeconds * 1000);
feedProcessorOptions.StartFromBeginning = true;
feedProcessorOptions.MaxItemCount = 2000;
ChangeFeedProcessorBuilder builder = new ChangeFeedProcessorBuilder();
builder
.WithHostName(this.HostName)
.WithFeedCollection(documentCollectionInfo)
.WithLeaseCollection(leaseContainerInfo)
.WithProcessorOptions(feedProcessorOptions)
.WithObserverFactory(new DocumentFeedObserverFactory(this.DocumentClient));
var result = await builder.BuildAsync();
await result.StartAsync().ConfigureAwait(false);
}
// Boilerplate from the ChangeFeedProcessor library.
public async Task RunChangeFeedHostAsync()
{
string hostName = "ChatHost" + DateTime.Now.Ticks.ToString();
// The collection to be observed is registered here.
DocumentCollectionInfo documentCollectionInfo = new DocumentCollectionInfo
{
Uri = new Uri(Keys.CosmosDBUri),
MasterKey = Keys.CosmosDBKey,
DatabaseName = GroupSelectionPageViewModel.SelectedDBName,
CollectionName = "Messages"
};
// The lease is a collection where the changes are temporary stored.
DocumentCollectionInfo leaseCollectionInfo = new DocumentCollectionInfo
{
Uri = new Uri(Keys.CosmosDBUri),
MasterKey = Keys.CosmosDBKey,
DatabaseName = GroupSelectionPageViewModel.SelectedDBName,
CollectionName = "Lease"
};
DocumentFeedObserverFactory docObserverFactory = new DocumentFeedObserverFactory();
ChangeFeedProcessorOptions feedProcessorOptions = new ChangeFeedProcessorOptions();
feedProcessorOptions.LeaseRenewInterval = TimeSpan.FromSeconds(15);
feedProcessorOptions.StartFromBeginning = true;
ChangeFeedProcessorBuilder builder = new ChangeFeedProcessorBuilder();
builder
.WithHostName(hostName)
.WithFeedCollection(documentCollectionInfo)
.WithLeaseCollection(leaseCollectionInfo)
.WithProcessorOptions(feedProcessorOptions)
.WithObserverFactory(new DocumentFeedObserverFactory());
// A new ChangeFeedProcessor is built and then run asynchronously.
var result = await builder.BuildAsync();
await result.StartAsync();
}
// Boilerplate from the ChangeFeedProcessor library.
public async Task RunChangeFeedHostAsync()
{
string hostName = "FlashHost" + DateTime.Now.Ticks.ToString();
DocumentCollectionInfo documentCollectionInfo = new DocumentCollectionInfo
{
Uri = new Uri(Keys.CosmosDBUri),
MasterKey = Keys.CosmosDBKey,
DatabaseName = GroupSelectionPageViewModel.SelectedDBName,
CollectionName = "Flashcards"
};
DocumentCollectionInfo leaseCollectionInfo = new DocumentCollectionInfo
{
Uri = new Uri(Keys.CosmosDBUri),
MasterKey = Keys.CosmosDBKey,
DatabaseName = GroupSelectionPageViewModel.SelectedDBName,
CollectionName = "FlashLease"
};
DocumentFeedObserverFactory docObserverFactory = new DocumentFeedObserverFactory();
ChangeFeedProcessorOptions feedProcessorOptions = new ChangeFeedProcessorOptions();
feedProcessorOptions.LeaseRenewInterval = TimeSpan.FromSeconds(15);
feedProcessorOptions.StartFromBeginning = true;
ChangeFeedProcessorBuilder builder = new ChangeFeedProcessorBuilder();
builder
.WithHostName(hostName)
.WithFeedCollection(documentCollectionInfo)
.WithLeaseCollection(leaseCollectionInfo)
.WithProcessorOptions(feedProcessorOptions)
.WithObserverFactory(new DocumentFeedObserverFactory());
var result = await builder.BuildAsync();
await result.StartAsync();
}
/// <summary>
/// Registers change feed observer to update changes read on change feed to destination
/// collection. Deregisters change feed observer and closes process when enter key is pressed
/// </summary>
/// <returns>A Task to allow asynchronous execution</returns>
public async Task RunChangeFeedHostAsync()
{
// newRecord(8888);
string hostName = Guid.NewGuid().ToString();
// monitored collection info
DocumentCollectionInfo documentCollectionLocation = new DocumentCollectionInfo
{
Uri = new Uri(this.monitoredUri),
MasterKey = this.monitoredSecretKey,
DatabaseName = this.monitoredDbName,
CollectionName = this.monitoredCollectionName
};
// lease collection info
DocumentCollectionInfo leaseCollectionLocation = new DocumentCollectionInfo
{
Uri = new Uri(this.leaseUri),
MasterKey = this.leaseSecretKey,
DatabaseName = this.leaseDbName,
CollectionName = this.leaseCollectionName
};
// destination collection info
DocumentCollectionInfo destCollInfo = new DocumentCollectionInfo
{
Uri = new Uri(this.destUri),
MasterKey = this.destSecretKey,
DatabaseName = this.destDbName,
CollectionName = this.destCollectionName
};
// Customizable change feed option and host options
ChangeFeedOptions feedOptions = new ChangeFeedOptions();
// ie customize StartFromBeginning so change feed reads from beginning
// can customize MaxItemCount, PartitonKeyRangeId, RequestContinuation, SessionToken and StartFromBeginning
feedOptions.StartFromBeginning = true;
ChangeFeedHostOptions feedHostOptions = new ChangeFeedHostOptions();
// ie. customizing lease renewal interval to 15 seconds
// can customize LeaseRenewInterval, LeaseAcquireInterval, LeaseExpirationInterval, FeedPollDelay
feedHostOptions.LeaseRenewInterval = TimeSpan.FromSeconds(15);
feedHostOptions.LeaseRenewInterval = TimeSpan.FromMilliseconds(100);
feedHostOptions.LeaseAcquireInterval = TimeSpan.FromMilliseconds(100);
feedHostOptions.FeedPollDelay = TimeSpan.FromMilliseconds(100);
using (DocumentClient destClient = new DocumentClient(destCollInfo.Uri, destCollInfo.MasterKey))
{
DocumentFeedObserverFactory docObserverFactory = new DocumentFeedObserverFactory(destClient, destCollInfo);
ChangeFeedEventHost host = new ChangeFeedEventHost(hostName, documentCollectionLocation, leaseCollectionLocation, feedOptions, feedHostOptions);
await host.RegisterObserverFactoryAsync(docObserverFactory);
Console.WriteLine("Running... Press enter to stop.");
Console.ReadLine();
// do not unreg for now
// await host.UnregisterObserversAsync();
}
}
