Embracing NServiceBus - best practices

Presentation delivered by Mark Taling and myself at NSBCon London, June 2014.

The video can be viewed on http://particular.net/nsbcon-2014

Transcript

1. ~
2. ~ Roy Cornelissen Software Architect @roycornelissen Mark Taling Lead Developer @marktaling
3. Where we started Discovering NServiceBus Multi tenancy Saga’s The evolution of NServiceBus Performance considerations Maintainability NServiceBus in a brownfield Wrap up Q&A
4. Integration Layer Service Layer NIS Presentation Layer Planning UI Reporting UI customer external apps Employee Self Service Common Forecast Realization Payment Schedule
5. Monitoring & Control Integration Layer Service Layer NIS Presentation Layer Planning UI Reporting UI Employee Self Service Common Forecast Payment Schedule Service Bus Integration Services IS HRM IS Payroll IS Budget IS Provisioning IS Time IS Point of Sale Realization
7. Tenant ID Tenant ID Tenant ID Tenant ID
8. public class BuildPrincipalFromHeaders : IMutateIncomingMessages { public object MutateIncoming(object message) { Thread.CurrentPrincipal = null; string tenantId = Headers.GetMessageHeader(message, “urn:dv:tenantid”); ICollection<Claim> claims = new List<Claim>(); … claims.Add(new Claim(SecurityConstants.TenantIdClaim, tenantId)); var principal = new ClaimsPrincipal( new ClaimsIdentityCollection { new ClaimsIdentity(claims) }); Thread.CurrentPrincipal = principal; return message; } …
9. public class SetHeadersFromPrincipal : IMutateOutgoingMessages { public IBus Bus { get; set; } public object MutateOutgoing(object message) { IClaimsIdentity identity = Thread.CurrentPrincipal.Identity as IClaimsIdentity; string tenantId = identity.GetTenantId(); if (!string.IsNullOrWhiteSpace(tenantId)) { Bus.SetMessageHeader(message, “urn:dv:tenantid”, tenantId); } return message; } …
10. - Multiple properties - Concatenation - IFindSaga - ISagaPersister
12. public class AdvancedRavenSagaPersister : RavenSagaPersister, ISagaPersister { public AdvancedRavenSagaPersister(RavenSessionFactory sessionFactory): base(sessionFactory) { } public new void Save(IContainSagaData saga) { base.Save(saga); } public new void Complete(IContainSagaData saga) { base.Complete(saga); } void ISagaPersister.Save(IContainSagaData saga) { Save(saga); } void ISagaPersister.Complete(IContainSagaData saga) { Complete(saga); } }
13. public class AdvancedRavenSagaPersister : RavenSagaPersister, ISagaPersister { public AdvancedRavenSagaPersister(RavenSessionFactory sessionFactory): base(sessionFactory) { } public new void Save(IContainSagaData saga) { base.Save(saga); } public new void Complete(IContainSagaData saga) { base.Complete(saga); } void ISagaPersister.Save(IContainSagaData saga) { Save(saga); } void ISagaPersister.Complete(IContainSagaData saga) { Complete(saga); } }
14. public class AdvancedRavenSagaPersister : RavenSagaPersister, ISagaPersister { public AdvancedRavenSagaPersister(RavenSessionFactory sessionFactory): base(sessionFactory) { } public new void Save(IContainSagaData saga) { base.Save(saga); StoreMappingKeys(saga); } public new void Complete(IContainSagaData saga) { RemoveMappingKeys(saga); base.Complete(saga); } void ISagaPersister.Save(IContainSagaData saga) { Save(saga); } void ISagaPersister.Complete(IContainSagaData saga) { Complete(saga); } }
15. public class AdvancedRavenSagaPersister : RavenSagaPersister, ISagaPersister { private readonly RavenSessionFactory _sessionFactory; public AdvancedRavenSagaPersister(RavenSessionFactory sessionFactory): base(sessionFactory) { _sessionFactory = sessionFactory; } public new void Save(IContainSagaData saga) { base.Save(saga); StoreMappingKeys(saga); } public new void Complete(IContainSagaData saga) { RemoveMappingKeys(saga); base.Complete(saga); } void ISagaPersister.Save(IContainSagaData saga) { Save(saga); } void ISagaPersister.Complete(IContainSagaData saga) { Complete(saga); } }
16. public class AdvancedRavenSagaPersister : RavenSagaPersister, ISagaPersister { private readonly RavenSessionFactory _sessionFactory; public AdvancedRavenSagaPersister(RavenSessionFactory sessionFactory): base(sessionFactory) { _sessionFactory = sessionFactory; } public new void Save(IContainSagaData saga) { base.Save(saga); StoreMappingKeys(saga); } public new void Complete(IContainSagaData saga) { RemoveMappingKeys(saga); base.Complete(saga); } void ISagaPersister.Save(IContainSagaData saga) { Save(saga); } void ISagaPersister.Complete(IContainSagaData saga) { Complete(saga); } } var document = _sessionFactory.Session.Include("SagaDocId").Load<SagaMappingIdentity>(mappingId); return _sessionFactory.Session.Load<TSagaData>(document.SagaId);
21. RequestUtcTimeout<PolicyRenewal>(TimeSpan.FromDays(300));
22. Lessons learned - Upgrade regularly - Retry PoCs and assumptions - Beware of abstractions
23. Lessons learned - Upgrade regularly - Retry PoCs and assumptions - Beware of abstractions
24. Keep your transactions on a diet Design with parallelism in mind {Tx} [Unique] saga properties
25. Keep your transactions on a diet Design with parallelism in mind {Tx} {Tx} [Unique] saga properties {Tx}
32. UseTransport<Rfc1149>(); http://www.make-awesome.com/2014/04/nservicebus-transport-for-rfc-1149/
33. NServiceBus is an opinionated framework If it fits, it fits like a glove Prepare to make concessions at first Clean up later Messaging makes totally different use cases possible Requires a new mindset for everyone
34. NServiceBus is a great way to break open existing architectures Despite its flexibility and pluggability, always follow its design principles Go with the flow, it solves real life problems you might not know you have
35. ~ Roy Cornelissen Software Architect @roycornelissen Mark Taling Lead Developer @marktaling blogs.infosupport.com