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15 – 16 November, Sofia ISTACon.org Event Sourcing By Vladik Khononov A New Dimension in Software Design

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org Agenda • How it happened • Why it happened • How event sourcing solves the problem • Why event sourcing benefits the company

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15 – 16 November, Sofia ISTACon.org Call Center Management

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15 – 16 November, Sofia ISTACon.org LEAD • Id • Name • Email • Phone • Status (Available / Follow-up / Closed / Converted)

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15 – 16 November, Sofia ISTACon.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

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15 – 16 November, Sofia ISTACon.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

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.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; } }

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org SELECT * FROM leads WHERE [name] LIKE ‘%name%’ OR [phone] LIKE ‘%phone%’ OR [email] LIKE ‘%email%’;

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WTF??? ISTACon.org

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15 – 16 November, Sofia ISTACon.org Lead #1410 Name Viktor Radkov Email viktor@radkov.com Phone 09-9801298 Status Available

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org PM

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15 – 16 November, Sofia ISTACon.org …1 month later

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org PM

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15 – 16 November, Sofia ISTACon.org …2 months later

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org PM

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15 – 16 November, Sofia ISTACon.org Search on stale data Status change dates Audit log for BI

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15 – 16 November, Sofia ISTACon.org PM

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15 – 16 November, Sofia ISTACon.org PM

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15 – 16 November, Sofia ISTACon.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; } }

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15 – 16 November, Sofia ISTACon.org Name Email Phone Status Follow-up Stefan Ivanov stefan@ivanov.com 03-27243457 Available

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15 – 16 November, Sofia ISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Follow-up 23/11/2016

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15 – 16 November, Sofia ISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted

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15 – 16 November, Sofia ISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org Event Sourcing

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15 – 16 November, Sofia ISTACon.org Changes = First class citizens = Events

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15 – 16 November, Sofia ISTACon.org Lead Events • Lead Was Initialized (Id) • Status Changed (NewStatus) • Name Changed (NewName) • Contact Information Changed (NewEmail, NewPhone) • Followup Set (Date)

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.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) {…} }

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15 – 16 November, Sofia ISTACon.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; }

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15 – 16 November, Sofia ISTACon.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; }

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15 – 16 November, Sofia ISTACon.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; }

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15 – 16 November, Sofia ISTACon.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; }

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.org Name Email Phone Status Follow-up Date Stefan Ivanov stefan@ivanov.com 050-8139904 Converted

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.org Lead: Stefan Ivanov Lead Was Initialized (1410) Status Changed (Available) Contact Information Changed (stefan@ivanov.com,03-27243457)

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.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; } }

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.org public class LeadSearch { public long Id { get; private set; } … public List Emails; public List Phones; … public void Apply(ContactInfoChanged event) {…} … } Apply(ContactInfoChanged event) { this.Phones.Append(event.NewPhone); this.Emails.Append(event.NewEmail); }

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15 – 16 November, Sofia ISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List StatusChangesLog; … public void Apply(StatusChanged event) {…} … } Apply(StatusChanged event) { this.StatusChangesLog.Append( new StatusLog(event.NewStatus, DateTime.Now); );

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15 – 16 November, Sofia ISTACon.org public class LeadStatusChangesModel { public long Id { get; set; } public List 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 Emails; public List Phones; … }

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15 – 16 November, Sofia ISTACon.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)

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15 – 16 November, Sofia ISTACon.org Events = Source of Truth Event Sourcing

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org Storage: Event Store

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15 – 16 November, Sofia ISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id) Event1,
 Event2,
 Event3, ….

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15 – 16 November, Sofia ISTACon.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”)

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15 – 16 November, Sofia ISTACon.org Event Store API: The Good News Append(Entity Id + New events) GetEvents(Entity Id) Event1,
 Event2,
 Event3, ….

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15 – 16 November, Sofia ISTACon.org Event Store API: The Bad News Append(Entity Id + New events) GetEvents(Entity Id) Event1,
 Event2,
 Event3, ….

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15 – 16 November, Sofia ISTACon.org CQRS Command Query Responsibility Segregation

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15 – 16 November, Sofia ISTACon.org CQRS • Command - write data • Query - read data • A use case can be either Command or Query. Never both

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15 – 16 November, Sofia ISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine

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15 – 16 November, Sofia ISTACon.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 …

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15 – 16 November, Sofia ISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine

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15 – 16 November, Sofia ISTACon.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

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15 – 16 November, Sofia ISTACon.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; }

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15 – 16 November, Sofia ISTACon.org Queries Read Model Read DB Commands Event Sourcing Event Store Projection engine

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15 – 16 November, Sofia ISTACon.org Queries Read Model Read DB Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files

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15 – 16 November, Sofia ISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Projection • RDBMS • Documents • Graphs • Files • Multiple DBs Read DBs

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15 – 16 November, Sofia ISTACon.org Queries Read Model Commands Write Model Writes DB Projection engine Read DBs Concurrency • Pessimistic • Optimistic • Optimistic on steroids

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15 – 16 November, Sofia ISTACon.org SetFollowupCommand + StatusChangeEvent => Collision ChangeNameCommand + StatusChangeEvent => OK

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15 – 16 November, Sofia ISTACon.org Event Sourcing + CQRS • Flexible business domain modeling • Insane scalability and availability • Rock solid infrastructure • …look great on your C.V.

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org CQRS: When? Event Sourcing ‎CQRS Non-functional benefits

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15 – 16 November, Sofia ISTACon.org Event Sourcing CQRS

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15 – 16 November, Sofia ISTACon.org Event Sourcing: When? ?

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15 – 16 November, Sofia ISTACon.org Subdomains Generic, Supporting, Core

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org Subdomains Generic, Supporting, Core

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGNS

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15 – 16 November, Sofia ISTACon.org Generic Subdomains

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGN

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGN

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15 – 16 November, Sofia ISTACon.org Supporting Subdomains

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGN

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGN

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15 – 16 November, Sofia ISTACon.org Core Domains

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15 – 16 November, Sofia ISTACon.org CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT LEAD MANAGEMENT COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT EMAIL CAMPAIGN

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15 – 16 November, Sofia ISTACon.org Event Sourcing: When? Core business domains

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15 – 16 November, Sofia ISTACon.org Before you try this at home

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15 – 16 November, Sofia ISTACon.org Available Event Stores • http://GetEventStore.com • NEventStore • Akka Persistence • Elastic Event Store (Coming soon)

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org €100 Discount for attendees of ISTA 2016 https://ti.to/webengineers/ddd17/discount/istacon2016

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15 – 16 November, Sofia ISTACon.org Domain-Driven Design • How to identify subdomains? • How to define business entities? • How do define events? • How to talk to business experts?

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15 – 16 November, Sofia ISTACon.org

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15 – 16 November, Sofia ISTACon.org Thank you! @vladikk vladikk.com vladikkhononov vladik@khononov.com