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CQRS & EVENT SOURCING
IN THE WILD
Michiel Rook - @michieltcs
➤ Java, PHP & Scala developer
➤ Consultant, trainer, speaker
➤ Dutch Web Alliance
➤ make.io
➤ Maintainer of Phing
➤ @michieltcs
YOU
RAISE YOUR HAND
IF YOU HAVE
heard about CQRS / Event Sourcing
RAISE YOUR HAND
IF YOU HAVE
heard about CQRS / Event Sourcing
followed a tutorial, built a hobby project
RAISE YOUR HAND
IF YOU HAVE
heard about CQRS / Event Sourcing
followed a tutorial, built a hobby project
used it in production
RAISE YOUR HAND
IF YOU HAVE
TOPICS
➤ Quick recap
➤ Replays and rebuilds
➤ Event versioning
➤ Concurrency
➤ Scale
QUICK RECAP
' Event Sourcing ensures that all
changes to application state are stored
as a sequence of events.
-Martin Fowler
ACTIVE RECORD VS. EVENT SOURCING
Account
number
Balance
12345678 €€ 50,00
... ...
Money Withdrawn
Account number 12345678
Amount €€ 50,00
Money Deposited
Account number 12345678
Amount €€ 100,00
Account Created
Account number 12345678
COMMANDS TO EVENTS
Deposit Money
Account number 12345678
Amount €€ 100,00
class DepositMoney {

public $accountNumber;

public $amount;

}
COMMANDS TO EVENTS
Deposit Money
Account number 12345678
Amount €€ 100,00
function depositMoney(DepositMoney $command) {

$this->apply(new MoneyDeposited(

$command->accountNumber,

$command->amount,

date()));

}
command

handler
COMMANDS TO EVENTS
Deposit Money
Account number 12345678
Amount €€ 100,00
Money Deposited
Account number 12345678
Amount €€ 100,00
class MoneyDeposited {

public $accountNumber;

public $amount;

public $timestamp;

}
command

handler
AGGREGATES
class BankAccount {

public $accountNumber;

public $balance;



// ...



public function applyMoneyDeposited(

MoneyDeposited $event) {

$this->balance += $event->amount;

}

AGGREGATE STATE
Account
number
Balance
12345678 €€ 0,00
Money Withdrawn
Account number 12345678
Amount €€ 50,00
Money Deposited
Account number 12345678
Amount €€ 100,00
Account Created
Account number 12345678
Account
number
Balance
12345678 €€ 100,00
Account
number
Balance
12345678 €€ 50,00
CQRS + EVENT SOURCING
Domain
UI
Event Bus
Event Handlers
Command
Repository
Data Layer
Database Database
Event
Store
commands
events
events
queries DTOs
Aggregates
PROS AND CONS
➤ Domain fit
➤ Testing
➤ Audit trail
➤ Scalability
➤ Complexity
➤ Library support / maturity
DISCLAIMER
REPLAYS AND REBUILDS
PROJECTIONS AND READ MODELS
User Registered
User Registered
User Unregistered Number of active users?
PROJECTIONS AND READ MODELS
User Registered
User Deactivated
User Reactivated
Number of active users?
User Registered
User Unregistered
PROJECTIONS AND READ MODELS
User Registered Event Handler
Number of
active users
+1
User Unregistered Event Handler
Number of
active users
-1
PROJECTIONS AND READ MODELS
Events Event Handler(s) Storage
ELASTICSEARCH
class CompanyRegistered {

public $companyId;

public $name;

public $street;

public $city;

}
ELASTICSEARCH
function handleCompanyRegistered(

CompanyRegistered $event) {



$this->elasticsearch->index([

'index' => 'companies',

'type' => 'company',

'id' => $event->companyId,

'body' => [

'name' => $event->name,

'address' => [

'street' => $event->street,

'city' => $event->city

]

]

]);

}
READ MODEL UPDATES
➤ New type
➤ New structure
➤ Based on existing events
➤ Generate from scratch?
REBUILDING
Stop
application
Remove
old read
model
Loop over
events
Apply to
read model
Start
application
ZERO DOWNTIME
Loop over
existing
events
Apply to
new read
model
Apply
queued
events
Start using
new read
model
New events Queue
CHALLENGE: LONG RUNNING REBUILDS
➤ Alternatives:
➤ In memory
➤ Distributed
➤ Partial
➤ Background
CHALLENGE: SIDE EFFECTS
User Registered
User Id 123abc
Email Address test@example.net
Event Handler
Exclude during replays!
CHALLENGE: TRANSACTIONS
Event Handler
Event Handler
Event
Event Handler
Event Handler ?
CHALLENGE: EVENTUAL CONSISTENCY
➤ Asynchronous event handlers
➤ Reads eventually return the same value
➤ Compare with ACID
➤ UI?
EVENT VERSIONING
DILEMMA
➤ New business requirements
➤ Refactoring
➤ New view on events
NEW EVENTS / VERSIONS
➤ No longer relevant
➤ Renamed
➤ Additional or renamed field(s)
➤ Too coarse, too fine
SUPPORT YOUR LEGACY?
➤ Commands can be renamed
➤ Events are immutable
➤ Correct (incorrect) old events with new events
UPCASTING
Event Store
UserRegistered_V1
Upcaster
UserRegistered_V2
Event Handler
UPCASTING
class UserRegistered_V1 {

public $userId;

public $name;

public $timestamp;

}
UPCASTING
class UserRegistered_V2 {

public $userId;

public $name;

public $date;

}
UPCASTING
function upcast($event): array {

if (!$event instanceof UserRegistered_V1) {

return [];

}

return [

new UserRegistered_V2(

$event->userId, $event->name,

$event->timestamp->format("Y-m-d"))

];

}
REWRITING HISTORY
Load (subset of) events
Deserialize
Modify
Serialize
Save/replace
THINGS TO BE AWARE OF
Upcasting
➤ Performance
➤ Complexity
➤ Existing projections not
automatically updated
Rewriting events
➤ Running code that
depends on old structure
➤ Breaking serialization
➤ Changing wrong events
CONCURRENCY
CONCURRENT COMMANDS
Withdraw Money
Account number 12345678
Amount €€ 50,00
Deposit Money
Account number 12345678
Amount €€ 100,00
?
PESSIMISTIC LOCKING
Withdraw Money
Account number 12345678
Amount €€ 50,00
Deposit Money
Account number 12345678
Amount €€ 100,00
Account
number
Balance
12345678 €€ 100,00
Account
number
Balance
12345678 €€ 50,00
wait for lock
lock
OPTIMISTIC LOCKING
Withdraw Money
Account number 12345678
Amount €€ 50,00
version 1
Deposit Money
Account number 12345678
Amount €€ 100,00
version 1
Account
number
Balance
12345678 €€ 100,00
version 2
ConcurrencyException
SCALE
PERFORMANCE
➤ Server
➤ Database
➤ Framework
➤ Language
➤ Serializer
STORAGE
➤ #events
➤ #aggregates
➤ #events_per_aggregate
➤ Serializer
➤ Event payloads
➤ Costs
SNAPSHOTS
Events
1 Account Created
2 Money Deposited
3 Money Withdrawn
4 Money Deposited
SNAPSHOT
5 Money Withdrawn
Events
1 Account Created
2 Money Deposited
3 Money Withdrawn
4 Money Deposited
5 Money Withdrawn
SHARDING
➤ Aggregate Id, Type, Event Timestamp, ...
➤ Rebalancing
➤ Distribution
ARCHIVING EVENTS
➤ Reduce working set
➤ Inactive / deleted aggregates
➤ Historic / irrelevant events
➤ Cheaper storage
FRAMEWORK COMPARISON
Framework Upcasting Snapshots Replaying
Broadway
(PHP)
No (PR) No (PR) Not in core
Prooph
(PHP)
MessageFactory
Yes, triggers on
event count
Example code,
off line
Axon
(Java/Scala)
Upcaster /
UpcasterChain
Yes, triggers on
event count
Yes,
ReplayingCluster
Akka
Persistence
(Java/Scala)
Event Adapter
Yes, decided by
actor
Yes
QUESTIONS
@michieltcs / michiel@make.io
www.touchdownconsulting.nl
https://joind.in/talk/584c0
THANK YOU!
@michieltcs / michiel@make.io
www.touchdownconsulting.nl
https://joind.in/talk/584c0

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