ISTA 2016: Event Sourcing

Vladik Khononov
Vladik Khononov
••
ISTA 2016: Event Sourcing
15 – 16 November, SofiaISTACon.org Event Sourcing By Vladik Khononov A New Dimension in Software Design
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org Agenda • How it happened • Why it happened • How event sourcing solves the problem • Why event sourcing benefits the company
15 – 16 November, SofiaISTACon.org Call Center Management
15 – 16 November, SofiaISTACon.org LEAD • Id • Name • Email • Phone • Status (Available / Follow-up / Closed / Converted)
15 – 16 November, SofiaISTACon.org Name Email Phone Status Stefan Ivanov stefan@ivanov.com 03-27243457 Available Viktor Kovachev viktor@kovachev.com 08-8332491 Available Martin Mateev martin@mateev.com 04-8537112 Available Lilyana Yankov lilyana@yankov.com 04-6092212 Available
15 – 16 November, SofiaISTACon.org Name Email Phone Status Stefan Ivanov stefan@ivanov.com 03-27243457 Available Viktor Kovachev viktor@kovachev.com 08-8332491 Available Martin Mateev martin@mateev.com 04-8537112 Available Lilyana Yankov lilyana@yankov.com 04-6092212 Available
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org SELECT * FROM leads WHERE [name] LIKE ‘%name%’ OR [phone] LIKE ‘%phone%’ OR [email] LIKE ‘%email%’;
WTF??? ISTACon.org
15 – 16 November, SofiaISTACon.org Lead #1410 Name Viktor Radkov Email viktor@radkov.com Phone 09-9801298 Status Available
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org PM
15 – 16 November, SofiaISTACon.org …1 month later
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org PM
15 – 16 November, SofiaISTACon.org …2 months later
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org PM
15 – 16 November, SofiaISTACon.org Search on stale data Status change dates Audit log for BI
15 – 16 November, SofiaISTACon.org PM
15 – 16 November, SofiaISTACon.org PM
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Stefan Ivanov stefan@ivanov.com 03-27243457 Available
15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Follow-up 23/11/2016
15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org Event Sourcing
15 – 16 November, SofiaISTACon.org Changes = First class citizens = Events
15 – 16 November, SofiaISTACon.org Lead Events • Lead Was Initialized (Id) • Status Changed (NewStatus) • Name Changed (NewName) • Contact Information Changed (NewEmail, NewPhone) • Followup Set (Date)
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov • Lead Was Initialized (1410) • Status Changed (Available) • Contact Information Changed (stefan@ivanov.com, 03-27243457) • Status Changed (Followup) • Followup Set (23/11/2016) • Contact Information Changed (stefan@ivanov.com, 050-8139904) • Status Changed (Converted)
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} }
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(StatusChanged event) { this.Status = event.NewStatus; }
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(NameChanged event) { this.Name = event.NewName; }
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(ContactInfoChanged event) { this.Phone = event.NewPhone; this.Email = event.NewEmail; }
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(FollowupSet event) { this.FollowUpOn = event.Date; }
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457)
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org public class LeadSearch { public long Id { get; private set; } … public List<string> Emails; public List<string> Phones; … public void Apply(ContactInfoChanged event) {…} … } Apply(ContactInfoChanged event) { this.Phones.Append(event.NewPhone); this.Emails.Append(event.NewEmail); }
15 – 16 November, SofiaISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List<StatusLog> StatusChangesLog; … public void Apply(StatusChanged event) {…} … } Apply(StatusChanged event) { this.StatusChangesLog.Append( new StatusLog(event.NewStatus, DateTime.Now); );
15 – 16 November, SofiaISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List<StatusLog> StatusChangesLog; … } public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } … } public class LeadSearch { public long Id { get; private set; } public List<string> Emails; public List<string> Phones; … }
15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
15 – 16 November, SofiaISTACon.org Events = Source of Truth Event Sourcing
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org Storage: Event Store
15 – 16 November, SofiaISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
15 – 16 November, SofiaISTACon.org Key (Entity Id) Value (Events list) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Converted) Lead #1406 1. LeadWasInitialized(1406) 2. StatusChanged(Available’’’) 3. NameChanged(“Lilyana Yankov”)
15 – 16 November, SofiaISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
15 – 16 November, SofiaISTACon.org Event Store API: The Bad News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
15 – 16 November, SofiaISTACon.org CQRS Command Query Responsibility Segregation
15 – 16 November, SofiaISTACon.org CQRS • Command - write data • Query - read data • A use case can be either Command or Query. Never both
15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine
15 – 16 November, SofiaISTACon.org Event Sourced Model (Write) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Closed) … 1000. StatusChanged(FollowUp) 1001. FollowupSet(16/11/2017) Read Model Id 1410 Name Martin Mateev Status Followup FollowupOn (Empty) Email … Phone …
15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine
15 – 16 November, SofiaISTACon.org Event Sourced Model (Write) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Closed) 5. StatusChanged(Available) 6. NameChanged(“Viktor Rumenov”) Read Model Id 1410 Phone … Status Available FollowupOn (Empty) Email … Name Martin Mateev
15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(NameChanged event) { this.Name = event.NewName; }
15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Event Sourcing Event Store Projection engine
15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files
15 – 16 November, SofiaISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files • Multiple DBs Read DBs
15 – 16 November, SofiaISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Read DBs Concurrency • Pessimistic • Optimistic • Optimistic on steroids
15 – 16 November, SofiaISTACon.org SetFollowupCommand + StatusChangeEvent => Collision ChangeNameCommand + StatusChangeEvent => OK
15 – 16 November, SofiaISTACon.org Event Sourcing + CQRS • Flexible business domain modeling • Insane scalability and availability • Rock solid infrastructure • …look great on your C.V.
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org CQRS: When? Event Sourcing ➡ CQRS Non-functional benefits
15 – 16 November, SofiaISTACon.org Event Sourcing CQRS
15 – 16 November, SofiaISTACon.org Event Sourcing: When? ?
15 – 16 November, SofiaISTACon.org Subdomains Generic, Supporting, Core
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org Subdomains Generic, Supporting, Core
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGNS
15 – 16 November, SofiaISTACon.org Generic Subdomains
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
15 – 16 November, SofiaISTACon.org Supporting Subdomains
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
15 – 16 November, SofiaISTACon.org Core Domains
15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
15 – 16 November, SofiaISTACon.org Event Sourcing: When? Core business domains
15 – 16 November, SofiaISTACon.org Before you try this at home
15 – 16 November, SofiaISTACon.org Available Event Stores • http://GetEventStore.com • NEventStore • Akka Persistence • Elastic Event Store (Coming soon)
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org €100 Discount for attendees of ISTA 2016 https://ti.to/webengineers/ddd17/discount/istacon2016
15 – 16 November, SofiaISTACon.org Domain-Driven Design • How to identify subdomains? • How to define business entities? • How do define events? • How to talk to business experts?
15 – 16 November, SofiaISTACon.org
15 – 16 November, SofiaISTACon.org Thank you! @vladikk vladikk.com vladikkhononov vladik@khononov.com
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ISTA 2016: Event Sourcing

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Engineering

Slides from my talk at ISTA 2016 - https://www.istacon.org/Sessions/Sessions?year=2016

Vladik Khononov
Vladik Khononov

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ISTA 2016: Event Sourcing

  • 2. 15 – 16 November, SofiaISTACon.org Event Sourcing By Vladik Khononov A New Dimension in Software Design
  • 3. 15 – 16 November, SofiaISTACon.org
  • 4. 15 – 16 November, SofiaISTACon.org
  • 5. 15 – 16 November, SofiaISTACon.org
  • 6. 15 – 16 November, SofiaISTACon.org Agenda • How it happened • Why it happened • How event sourcing solves the problem • Why event sourcing benefits the company
  • 7. 15 – 16 November, SofiaISTACon.org Call Center Management
  • 8. 15 – 16 November, SofiaISTACon.org LEAD • Id • Name • Email • Phone • Status (Available / Follow-up / Closed / Converted)
  • 9. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Stefan Ivanov stefan@ivanov.com 03-27243457 Available Viktor Kovachev viktor@kovachev.com 08-8332491 Available Martin Mateev martin@mateev.com 04-8537112 Available Lilyana Yankov lilyana@yankov.com 04-6092212 Available
  • 10. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Stefan Ivanov stefan@ivanov.com 03-27243457 Available Viktor Kovachev viktor@kovachev.com 08-8332491 Available Martin Mateev martin@mateev.com 04-8537112 Available Lilyana Yankov lilyana@yankov.com 04-6092212 Available
  • 11. 15 – 16 November, SofiaISTACon.org
  • 12. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
  • 13. 15 – 16 November, SofiaISTACon.org
  • 14. 15 – 16 November, SofiaISTACon.org SELECT * FROM leads WHERE [name] LIKE ‘%name%’ OR [phone] LIKE ‘%phone%’ OR [email] LIKE ‘%email%’;
  • 16. 15 – 16 November, SofiaISTACon.org Lead #1410 Name Viktor Radkov Email viktor@radkov.com Phone 09-9801298 Status Available
  • 17. 15 – 16 November, SofiaISTACon.org
  • 18. 15 – 16 November, SofiaISTACon.org PM
  • 19. 15 – 16 November, SofiaISTACon.org …1 month later
  • 20. 15 – 16 November, SofiaISTACon.org
  • 21. 15 – 16 November, SofiaISTACon.org PM
  • 22. 15 – 16 November, SofiaISTACon.org …2 months later
  • 23. 15 – 16 November, SofiaISTACon.org
  • 24. 15 – 16 November, SofiaISTACon.org PM
  • 25. 15 – 16 November, SofiaISTACon.org Search on stale data Status change dates Audit log for BI
  • 26. 15 – 16 November, SofiaISTACon.org PM
  • 27. 15 – 16 November, SofiaISTACon.org PM
  • 28. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
  • 29. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Stefan Ivanov stefan@ivanov.com 03-27243457 Available
  • 30. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Follow-up 23/11/2016
  • 31. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
  • 32. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
  • 33. 15 – 16 November, SofiaISTACon.org
  • 34. 15 – 16 November, SofiaISTACon.org Event Sourcing
  • 35. 15 – 16 November, SofiaISTACon.org Changes = First class citizens = Events
  • 36. 15 – 16 November, SofiaISTACon.org Lead Events • Lead Was Initialized (Id) • Status Changed (NewStatus) • Name Changed (NewName) • Contact Information Changed (NewEmail, NewPhone) • Followup Set (Date)
  • 37. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov • Lead Was Initialized (1410) • Status Changed (Available) • Contact Information Changed (stefan@ivanov.com, 03-27243457) • Status Changed (Followup) • Followup Set (23/11/2016) • Contact Information Changed (stefan@ivanov.com, 050-8139904) • Status Changed (Converted)
  • 38. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} }
  • 39. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(StatusChanged event) { this.Status = event.NewStatus; }
  • 40. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(NameChanged event) { this.Name = event.NewName; }
  • 41. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(ContactInfoChanged event) { this.Phone = event.NewPhone; this.Email = event.NewEmail; }
  • 42. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(FollowupSet event) { this.FollowUpOn = event.Date; }
  • 43. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 44. 15 – 16 November, SofiaISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted
  • 45. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 46. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457)
  • 47. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 48. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 49. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } }
  • 50. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 51. 15 – 16 November, SofiaISTACon.org public class LeadSearch { public long Id { get; private set; } … public List<string> Emails; public List<string> Phones; … public void Apply(ContactInfoChanged event) {…} … } Apply(ContactInfoChanged event) { this.Phones.Append(event.NewPhone); this.Emails.Append(event.NewEmail); }
  • 52. 15 – 16 November, SofiaISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List<StatusLog> StatusChangesLog; … public void Apply(StatusChanged event) {…} … } Apply(StatusChanged event) { this.StatusChangesLog.Append( new StatusLog(event.NewStatus, DateTime.Now); );
  • 53. 15 – 16 November, SofiaISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List<StatusLog> StatusChangesLog; … } public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } … } public class LeadSearch { public long Id { get; private set; } public List<string> Emails; public List<string> Phones; … }
  • 54. 15 – 16 November, SofiaISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457) Status Changed (Converted) Status Changed (Followup) Followup Set (23/11/2016) Contact Information Changed (stefan@ivanov.com, 050-8139904)
  • 55. 15 – 16 November, SofiaISTACon.org Events = Source of Truth Event Sourcing
  • 56. 15 – 16 November, SofiaISTACon.org
  • 57. 15 – 16 November, SofiaISTACon.org
  • 58. 15 – 16 November, SofiaISTACon.org
  • 59. 15 – 16 November, SofiaISTACon.org Storage: Event Store
  • 60. 15 – 16 November, SofiaISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
  • 61. 15 – 16 November, SofiaISTACon.org Key (Entity Id) Value (Events list) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Converted) Lead #1406 1. LeadWasInitialized(1406) 2. StatusChanged(Available’’’) 3. NameChanged(“Lilyana Yankov”)
  • 62. 15 – 16 November, SofiaISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
  • 63. 15 – 16 November, SofiaISTACon.org Event Store API: The Bad News Append(Entity Id + New events) GetEvents(Entity Id)Event1,
 Event2,
 Event3, ….
  • 64. 15 – 16 November, SofiaISTACon.org CQRS Command Query Responsibility Segregation
  • 65. 15 – 16 November, SofiaISTACon.org CQRS • Command - write data • Query - read data • A use case can be either Command or Query. Never both
  • 66. 15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine
  • 67. 15 – 16 November, SofiaISTACon.org Event Sourced Model (Write) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Closed) … 1000. StatusChanged(FollowUp) 1001. FollowupSet(16/11/2017) Read Model Id 1410 Name Martin Mateev Status Followup FollowupOn (Empty) Email … Phone …
  • 68. 15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine
  • 69. 15 – 16 November, SofiaISTACon.org Event Sourced Model (Write) Lead #1410 1. LeadWasInitialized(1410) 2. StatusChanged(Available) 3. NameChanged(“Martin Mateev”) 4. StatusChanged(Closed) 5. StatusChanged(Available) 6. NameChanged(“Viktor Rumenov”) Read Model Id 1410 Phone … Status Available FollowupOn (Empty) Email … Name Martin Mateev
  • 70. 15 – 16 November, SofiaISTACon.org public class Lead { public long Id { get; set; } public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public LeadStatus Status { get; set; } public DateTime? FollowupOn { get; set; } public void Apply(LeadWasInitialized event) {…} public void Apply(StatusChanged event) {…} public void Apply(NameChanged event) {…} public void Apply(ContactInfoChanged event) {…} public void Apply(FollowupSet event) {…} } Apply(NameChanged event) { this.Name = event.NewName; }
  • 71. 15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Event Sourcing Event Store Projection engine
  • 72. 15 – 16 November, SofiaISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files
  • 73. 15 – 16 November, SofiaISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files • Multiple DBs Read DBs
  • 74. 15 – 16 November, SofiaISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Read DBs Concurrency • Pessimistic • Optimistic • Optimistic on steroids
  • 75. 15 – 16 November, SofiaISTACon.org SetFollowupCommand + StatusChangeEvent => Collision ChangeNameCommand + StatusChangeEvent => OK
  • 76. 15 – 16 November, SofiaISTACon.org Event Sourcing + CQRS • Flexible business domain modeling • Insane scalability and availability • Rock solid infrastructure • …look great on your C.V.
  • 77. 15 – 16 November, SofiaISTACon.org
  • 78. 15 – 16 November, SofiaISTACon.org CQRS: When? Event Sourcing ➡ CQRS Non-functional benefits
  • 79. 15 – 16 November, SofiaISTACon.org Event Sourcing CQRS
  • 80. 15 – 16 November, SofiaISTACon.org Event Sourcing: When? ?
  • 81. 15 – 16 November, SofiaISTACon.org Subdomains Generic, Supporting, Core
  • 82. 15 – 16 November, SofiaISTACon.org
  • 83. 15 – 16 November, SofiaISTACon.org Subdomains Generic, Supporting, Core
  • 84. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGNS
  • 85. 15 – 16 November, SofiaISTACon.org Generic Subdomains
  • 86. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
  • 87. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
  • 88. 15 – 16 November, SofiaISTACon.org Supporting Subdomains
  • 89. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
  • 90. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
  • 91. 15 – 16 November, SofiaISTACon.org Core Domains
  • 92. 15 – 16 November, SofiaISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENTCOMMISSIONS CALCULATION DESK MANAGEMENTVOIP MANAGEMENT EMAIL CAMPAIGN
  • 93. 15 – 16 November, SofiaISTACon.org Event Sourcing: When? Core business domains
  • 94. 15 – 16 November, SofiaISTACon.org Before you try this at home
  • 95. 15 – 16 November, SofiaISTACon.org Available Event Stores • http://GetEventStore.com • NEventStore • Akka Persistence • Elastic Event Store (Coming soon)
  • 96. 15 – 16 November, SofiaISTACon.org
  • 97. 15 – 16 November, SofiaISTACon.org €100 Discount for attendees of ISTA 2016 https://ti.to/webengineers/ddd17/discount/istacon2016
  • 98. 15 – 16 November, SofiaISTACon.org Domain-Driven Design • How to identify subdomains? • How to define business entities? • How do define events? • How to talk to business experts?
  • 99. 15 – 16 November, SofiaISTACon.org
  • 100. 15 – 16 November, SofiaISTACon.org Thank you! @vladikk vladikk.com vladikkhononov vladik@khononov.com