public async Task TransferSubscriptions()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
IUserIdentity selectedUserIdentity = new UserNameIdentity("root", "secret");
var client = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{client.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{client.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{client.RemoteEndpoint.SecurityMode}'.");
await client.OpenAsync();
Console.WriteLine($"Activated session '{client.SessionId}'.");
var req = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 1000,
RequestedMaxKeepAliveCount = 20,
PublishingEnabled = true
};
var res = await client.CreateSubscriptionAsync(req);
Console.WriteLine($"Created subscription '{res.SubscriptionId}'.");
Console.WriteLine($"Aborting session '{client.SessionId}'.");
await client.AbortAsync();
var client2 = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
await client2.OpenAsync();
Console.WriteLine($"Activated session '{client2.SessionId}'.");
var req2 = new TransferSubscriptionsRequest
{
SubscriptionIds = new[] { res.SubscriptionId }
};
var res2 = await client2.TransferSubscriptionsAsync(req2);
Console.WriteLine($"Transferred subscription result '{res2.Results[0].StatusCode}'.");
Assert.IsTrue(StatusCode.IsGood(res2.Results[0].StatusCode));
Console.WriteLine($"Closing session '{client2.SessionId}'.");
await client2.CloseAsync();
}
/// <summary>
/// Transfers a Subscription and its MonitoredItems from one Session to another.
/// </summary>
/// <param name="client">A instance of <see cref="ISessionClient"/>.</param>
/// <param name="request">A <see cref="TransferSubscriptionsRequest"/>.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation that returns a <see cref="TransferSubscriptionsResponse"/>.</returns>
public static async Task<TransferSubscriptionsResponse> TransferSubscriptionsAsync(this ISessionClient client, TransferSubscriptionsRequest request)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
return (TransferSubscriptionsResponse)await client.RequestAsync(request).ConfigureAwait(false);
}