public async Task <bool> RenewResourceObserverLeaseAsync(string resourceUriString, string leaseKey,
TimeSpan lifetime)
{
IPiSystem resource = GetPiSystem(resourceUriString);
return(await resource.RenewObserverLeaseAsync(leaseKey, lifetime));
}
public async Task <ActionResult <IEnumerable <string> > > GetPiSystemSubscriptionList(string resourceUriString)
{
try
{
if (string.IsNullOrEmpty(resourceUriString))
{
throw new ArgumentNullException("resourceUriString");
}
IPiSystem pisystem = graphManager.GetPiSystem(resourceUriString);
if (pisystem == null)
{
logger?.LogWarning($"Pi-system '{resourceUriString}' is null.");
}
else
{
logger?.LogInformation($"Returned pi-system '{resourceUriString}'.");
}
IEnumerable <string> list = await pisystem.GetSubscriptionListAsync();
return(StatusCode(200, list));
}
catch (Exception ex)
{
logger?.LogError(ex, $"Error getting subscriptions from pi-system.");
return(StatusCode(500, ex.Message));
}
}
/// <summary>
/// Add an error observer to a resource.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <param name="lifetime">The lifetime of the lease.</param>
/// <param name="observer">Error observer to receive events.</param>
/// <returns>A unique string for the lease key, whic is used to refresh the lease for the observer.</returns>
public async Task <string> AddResourceObserverAsync(string resourceUriString, TimeSpan lifetime, ErrorObserver observer)
{
IErrorObserver objRef = await client.CreateObjectReference <IErrorObserver>(observer);
IPiSystem resource = GetPiSystem(resourceUriString);
return(await resource.AddObserverAsync(lifetime, objRef));
}
/// <summary>
/// Adds or updates a resource's metadata.
/// </summary>
/// <param name="metadata">Metadata that describes the resource.</param>
/// <returns></returns>
public async Task UpsertPiSystemMetadataAsync(EventMetadata metadata)
{
Uri uri = new Uri(metadata.ResourceUriString);
metadata.ResourceUriString = uri.ToCanonicalString(false);
IPiSystem resource = GetPiSystem(metadata.ResourceUriString);
await resource.UpsertMetadataAsync(metadata);
}
public async Task UnsubscribeAsync(string subscriptionUriString, string identity)
{
Uri uri = new Uri(subscriptionUriString);
string resourceUriString = uri.ToCanonicalString(false, true);
IPiSystem resource = GetPiSystem(resourceUriString);
await resource.UnsubscribeAsync(subscriptionUriString, identity);
}
/// <summary>
/// Unsubscribes a subscription from a resource.
/// </summary>
/// <param name="subscriptionUriString">Unique URI for the subscription.</param>
/// <returns></returns>
public async Task UnsubscribeAsync(string subscriptionUriString)
{
//get the resource to unsubscribe
Uri uri = new Uri(subscriptionUriString);
string resourceUriString = uri.ToCanonicalString(false, true);
IPiSystem resource = GetPiSystem(resourceUriString);
//unsubscribe from the resource
await resource.UnsubscribeAsync(subscriptionUriString);
}
private async Task UnsubscribeFromResourceAsync()
{
//unsubscribe from resource
string uriString = State.Metadata.SubscriptionUriString;
Uri uri = new Uri(uriString);
string resourceUriString = uriString.Replace("/" + uri.Segments[uri.Segments.Length - 1], "");
IPiSystem resource = GrainFactory.GetGrain <IPiSystem>(resourceUriString);
if (State.Metadata != null && !string.IsNullOrEmpty(State.Metadata.SubscriptionUriString))
{
await resource.UnsubscribeAsync(State.Metadata.SubscriptionUriString);
}
}
public async Task <string> SubscribeAsync(string resourceUriString, SubscriptionMetadata metadata)
{
Uri uri = new Uri(resourceUriString);
string subscriptionUriString = uri.ToCanonicalString(true) + Guid.NewGuid();
metadata.SubscriptionUriString = subscriptionUriString;
ISubscription subscription = GetSubscription(subscriptionUriString);
await subscription.UpsertMetadataAsync(metadata);
IPiSystem resource = GetPiSystem(uri.ToCanonicalString(false));
await resource.SubscribeAsync(subscription);
return(subscriptionUriString);
}
private async void Sink_OnResponse(object sender, EventSinkResponseArgs e)
{
IPiSystem pisystem = GrainFactory.GetGrain <IPiSystem>(e.Message.ResourceUri);
await pisystem.PublishAsync(e.Message);
}
/// <summary>
/// Clears the resource; equivalent to deleting the resource.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <returns></returns>
public async Task ClearPiSystemAsync(string resourceUriString)
{
IPiSystem resource = GetPiSystem(resourceUriString);
await resource.ClearAsync();
}
/// <summary>
/// Removes an observer from a resource.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <param name="leaseKey">Unqiue string of the observer's lease.</param>
/// <returns></returns>
public async Task RemoveResourceObserverAsync(string resourceUriString, string leaseKey)
{
IPiSystem resource = GetPiSystem(resourceUriString);
await resource.RemoveObserverAsync(leaseKey);
}
/// <summary>
/// Gets a list of subscription URIs subscribed to the resource.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <returns>Array of subscription URIs subscribed to the resource.</returns>
public async Task <IEnumerable <string> > GetPiSystemSubscriptionListAsync(string resourceUriString)
{
IPiSystem resource = GetPiSystem(resourceUriString);
return(await resource.GetSubscriptionListAsync());
}
/// <summary>
/// Publishes a message to a resources with indexes.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <param name="message">Message to publishes.</param>
/// <param name="indexes">Indexes used to filter subscriptions to subset.</param>
/// <returns></returns>
public async Task PublishAsync(string resourceUriString, EventMessage message, List <KeyValuePair <string, string> > indexes)
{
IPiSystem resource = GetPiSystem(resourceUriString);
await resource.PublishAsync(message, indexes);
}
/// <summary>
/// Publishes a message to a resource.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <param name="message">Message to publish.</param>
/// <returns></returns>
public async Task PublishAsync(string resourceUriString, EventMessage message)
{
IPiSystem resource = GetPiSystem(resourceUriString);
await resource.PublishAsync(message);
}
public async Task <CommunicationMetrics> GetPiSystemMetricsAsync(string resourceUriString)
{
IPiSystem resource = GetPiSystem(resourceUriString);
return(await resource.GetMetricsAsync());
}
/// <summary>
/// Get a resource's metadata.
/// </summary>
/// <param name="resourceUriString">Unique URI that identifies the resource.</param>
/// <returns>Resource's metadata.</returns>
public async Task <EventMetadata> GetPiSystemMetadataAsync(string resourceUriString)
{
IPiSystem resource = GetPiSystem(resourceUriString);
return(await resource.GetMetadataAsync());
}
