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Event Sourcing in practice @ Qandidate.com
Willem-Jan Zijderveld
November 14, 2015
Programming
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Event Sourcing in practice @ Qandidate.com
A talk I gave first at Domcode Conference 2015.
Willem-Jan Zijderveld
November 14, 2015
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Transcript
Event sourcing in production Willem-Jan Zijderveld @willemjanz wjzijderveld@gmail.com joind.in/16227
Event sourcing
Short introduction into our domain
Job Marketing Platform
Choosing the best channels to find your candidates
Online Job Marketing
1. Create a campaign for your target group
2. You get a recommendation
3. You can customize your campaign
Why event sourcing?
You are throwing away data!
By only saving last known state
You don't know the previous state
You don't know why something changed
How does event sourcing help?
Using events to store changes
Describe with your events what happened
Describe with your events why something happened
Use the events to calculate the current state
Allows you to go back in time
Helps to understand the flow in your application
Example: Discarding the customizations
CRUD
Keep track if channel was part of recommendation
Keep track if channel was part of recommendation Remove the
non-recommended channels
Keep track if channel was part of recommendation How about
removed channels?
Keep track if channel was part of recommendation Implement soft-delete
Keep track if channel was part of recommendation Implement soft-delete
for new campaigns
Event sourcing
Just rewind
Just rewind Campaign Created For Target Group Channel Removed From
Campaign Channel Added To Campaign Customization Discarded
Just rewind Campaign Created For Target Group Channel Removed From
Campaign Channel Added To Campaign Customization Discarded
Just rewind Campaign Created For Target Group Channel Removed From
Campaign Channel Added To Campaign Customization Discarded
Just rewind Campaign Created For Target Group Channel Removed From
Campaign Channel Added To Campaign Customization Discarded
How?
With the help of CQRS and Domain Driven Design
And the help of Broadway github.com/qandidate-labs/broadway
Creating a new campaign
Campaign Event Store Create Campaign For Target Group Campaign Created
For Target Group
Dispatching the command /** @Route("/campaigns", methods={"POST"}) */ public function createCampaignAction(CreateCampaignDto
$dto) { $campaignId = Webshop\CampaignId::generate(); $this->commandBus->dispatch(new CreateCampaignForTargetGroup( $campaignId, $this->companyId, $this->accountId, TargetGroup::describe( TargetGroup\JobTitle::fromString($dto->title), TargetGroup\Region::fromId($dto->region), TargetGroup\JobCategory::fromId($dto->jobCategory), TargetGroup\EducationLevel::fromId($dto->educationLevel), TargetGroup\JobLevel::fromId($dto->jobLevel), TargetGroup\Industry::fromId($dto->industry) ) )); return new JsonResponse( ['id' => (string) $campaignId], JsonResponse::HTTP_CREATED ); }
Dispatching the command /** @Route("/campaigns", methods={"POST"}) */ public function createCampaignAction(CreateCampaignDto
$dto) { $campaignId = Webshop\CampaignId::generate(); $this->commandBus->dispatch(new CreateCampaignForTargetGroup( $campaignId, $this->companyId, $this->accountId, TargetGroup::describe( TargetGroup\JobTitle::fromString($dto->title), TargetGroup\Region::fromId($dto->region), TargetGroup\JobCategory::fromId($dto->jobCategory), TargetGroup\EducationLevel::fromId($dto->educationLevel), TargetGroup\JobLevel::fromId($dto->jobLevel), TargetGroup\Industry::fromId($dto->industry) ) )); return new JsonResponse( ['id' => (string) $campaignId], JsonResponse::HTTP_CREATED ); }
Dispatching the command /** @Route("/campaigns", methods={"POST"}) */ public function createCampaignAction(CreateCampaignDto
$dto) { $campaignId = Webshop\CampaignId::generate(); $this->commandBus->dispatch(new CreateCampaignForTargetGroup( $campaignId, $this->companyId, $this->accountId, TargetGroup::describe( TargetGroup\JobTitle::fromString($dto->title), TargetGroup\Region::fromId($dto->region), TargetGroup\JobCategory::fromId($dto->jobCategory), TargetGroup\EducationLevel::fromId($dto->educationLevel), TargetGroup\JobLevel::fromId($dto->jobLevel), TargetGroup\Industry::fromId($dto->industry) ) )); return new JsonResponse( ['id' => (string) $campaignId], JsonResponse::HTTP_CREATED ); }
Handling the command // CampaignCommandHandler.php public function handleCreateCampaignForTargetGroup( CreateCampaignForTargetGroup $command
) { $campaign = Campaign::createForTargetGroup( $command->getCampaignId(), $command->getCompanyId(), $command->getRecruiterId(), $command->getTargetGroup(), $this->recommender ); $this->campaignRepository->save($campaign); }
Handling the command // CampaignCommandHandler.php public function handleCreateCampaignForTargetGroup( CreateCampaignForTargetGroup $command
) { $campaign = Campaign::createForTargetGroup( $command->getCampaignId(), $command->getCompanyId(), $command->getRecruiterId(), $command->getTargetGroup(), $this->recommender ); $this->campaignRepository->save($campaign); }
Handling the command // CampaignCommandHandler.php public function handleCreateCampaignForTargetGroup( CreateCampaignForTargetGroup $command
) { $campaign = Campaign::createForTargetGroup( $command->getCampaignId(), $command->getCompanyId(), $command->getRecruiterId(), $command->getTargetGroup(), $this->recommender ); $this->campaignRepository->save($campaign); }
Action → Reaction // Campaign.php public static function createForTargetGroup(/* args
*/) { $campaign = new Campaign(); $campaignChannels = $recommender->recommend(/* args */); $campaign->apply(new CampaignCreatedForTargetGroup( $campaignId, $companyId, $accountId, Channels::fromCollection($campaignChannels), $targetGroup, $campaign->calculateCampaignPrice($campaignChannels), $campaign->calculateEstimatedOutcome($campaignChannels) )); return $campaign; }
Action → Reaction // Campaign.php public static function createForTargetGroup(/* args
*/) { $campaign = new Campaign(); $campaignChannels = $recommender->recommend(/* args */); $campaign->apply(new CampaignCreatedForTargetGroup( $campaignId, $companyId, $accountId, Channels::fromCollection($campaignChannels), $targetGroup, $campaign->calculateCampaignPrice($campaignChannels), $campaign->calculateEstimatedOutcome($campaignChannels) )); return $campaign; }
Action → Reaction // Campaign.php public static function createForTargetGroup(/* args
*/) { $campaign = new Campaign(); $campaignChannels = $recommender->recommend(/* args */); $campaign->apply(new CampaignCreatedForTargetGroup( $campaignId, $companyId, $accountId, Channels::fromCollection($campaignChannels), $targetGroup, $campaign->calculateCampaignPrice($campaignChannels), $campaign->calculateEstimatedOutcome($campaignChannels) )); return $campaign; }
Action → Reaction // Campaign.php public static function createForTargetGroup(/* args
*/) { $campaign = new Campaign(); $campaignChannels = $recommender->recommend(/* args */); $campaign->apply(new CampaignCreatedForTargetGroup( $campaignId, $companyId, $accountId, Channels::fromCollection($campaignChannels), $targetGroup, $campaign->calculateCampaignPrice($campaignChannels), $campaign->calculateEstimatedOutcome($campaignChannels) )); return $campaign; }
// Broadway: EventSourcedAggregateRoot.php public function apply($event) { $this->handleRecursively($event); $this->playhead++; $this->uncommittedEvents[]
= DomainMessage::recordNow( $this->getAggregateRootId(), $this->playhead, new Metadata(), $event ); }
// Broadway: EventSourcedAggregateRoot.php public function apply($event) { $this->handleRecursively($event); $this->playhead++; $this->uncommittedEvents[]
= DomainMessage::recordNow( $this->getAggregateRootId(), $this->playhead, new Metadata(), $event ); }
Campaign Event Store Create Campaign For Target Group Campaign Created
For Target Group
// Campaign.php protected function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event ) { $this->id
= $event->getCampaignId(); $this->channels = $event->getRecommendedChannels()->toArray(); $this->campaignPrice = $event->getCampaignPrice(); $this->estimatedOutcome = $event->getEstimatedOutcome(); $this->targetGroup = $event->getTargetGroup(); $this->setInitialRecommendation( $this->channels, $this->estimatedOutcome, $this->campaignPrice ); }
// Broadway: EventSourcedAggregateRoot.php public function apply($event) { $this->handleRecursively($event); $this->playhead++; $this->uncommittedEvents[]
= DomainMessage::recordNow( $this->getAggregateRootId(), $this->playhead, new Metadata(), $event ); }
// Broadway: EventSourcedAggregateRoot.php public function apply($event) { $this->handleRecursively($event); $this->playhead++; $this->uncommittedEvents[]
= DomainMessage::recordNow( $this->getAggregateRootId(), $this->playhead, new Metadata(), $event ); }
// Broadway: EventSourcedAggregateRoot.php public function apply($event) { $this->handleRecursively($event); $this->playhead++; $this->uncommittedEvents[]
= DomainMessage::recordNow( $this->getAggregateRootId(), $this->playhead, new Metadata(), $event ); }
Handling the command // CampaignCommandHandler.php public function handleCreateCampaignForTargetGroup( CreateCampaignForTargetGroup $command
) { $campaign = Campaign::createForTargetGroup( $command->getCampaignId(), $command->getCompanyId(), $command->getRecruiterId(), $command->getTargetGroup(), $this->recommender, $this->portfolio, $this->aidaMetricsCalculator ); $this->campaignRepository->save($campaign); }
Saving the events // Broadway: EventSourcingRepository.php public function save(AggregateRoot $aggregate)
{ // maybe we can get generics one day.... ;) Assert::isInstanceOf($aggregate, $this->aggregateClass); $eventStream = $aggregate->getUncommittedEvents(); $this->eventStore->append( $aggregate->getAggregateRootId(), $eventStream ); $this->eventBus->publish($eventStream); }
Saving the events // Broadway: EventSourcingRepository.php public function save(AggregateRoot $aggregate)
{ // maybe we can get generics one day.... ;) Assert::isInstanceOf($aggregate, $this->aggregateClass); $eventStream = $aggregate->getUncommittedEvents(); $this->eventStore->append( $aggregate->getAggregateRootId(), $eventStream ); $this->eventBus->publish($eventStream); }
Saving the events // Broadway: EventSourcingRepository.php public function save(AggregateRoot $aggregate)
{ // maybe we can get generics one day.... ;) Assert::isInstanceOf($aggregate, $this->aggregateClass); $eventStream = $aggregate->getUncommittedEvents(); $this->eventStore->append( $aggregate->getAggregateRootId(), $eventStream ); $this->eventBus->publish($eventStream); }
It happened in the past
Append only
Campaign Event Store Create Campaign For Target Group Campaign Created
For Target Group
How would we load a campaign?
Campaign Event Store Campaign Created For Target Group
// Broadway: EventSourcingRepository.php public function load($id) { try { $domainEventStream
= $this->eventStore->load($id); return $this->aggregateFactory->create( $this->aggregateClass, $domainEventStream ); } catch (EventStreamNotFoundException $e) { throw AggregateNotFoundException::create($id, $e); } } // Broadway: EventSourcedAggregateRoot.php public function initializeState(DomainEventStreamInterface $stream) { foreach ($stream as $message) { $this->playhead++; $this->handleRecursively($message->getPayload()); } }
// Broadway: EventSourcingRepository.php public function load($id) { try { $domainEventStream
= $this->eventStore->load($id); return $this->aggregateFactory->create( $this->aggregateClass, $domainEventStream ); } catch (EventStreamNotFoundException $e) { throw AggregateNotFoundException::create($id, $e); } } // Broadway: EventSourcedAggregateRoot.php public function initializeState(DomainEventStreamInterface $stream) { foreach ($stream as $message) { $this->playhead++; $this->handleRecursively($message->getPayload()); } }
// Broadway: EventSourcingRepository.php public function load($id) { try { $domainEventStream
= $this->eventStore->load($id); return $this->aggregateFactory->create( $this->aggregateClass, $domainEventStream ); } catch (EventStreamNotFoundException $e) { throw AggregateNotFoundException::create($id, $e); } } // Broadway: EventSourcedAggregateRoot.php public function initializeState(DomainEventStreamInterface $stream) { foreach ($stream as $message) { $this->playhead++; $this->handleRecursively($message->getPayload()); } }
// Broadway: EventSourcingRepository.php public function load($id) { try { $domainEventStream
= $this->eventStore->load($id); return $this->aggregateFactory->create( $this->aggregateClass, $domainEventStream ); } catch (EventStreamNotFoundException $e) { throw AggregateNotFoundException::create($id, $e); } } // Broadway: EventSourcedAggregateRoot.php public function initializeState(DomainEventStreamInterface $stream) { foreach ($stream as $message) { $this->playhead++; $this->handleRecursively($message->getPayload()); } }
Let's add a channel
Campaign Event Store Add Channel To Campaign Channel Added To
Campaign
// CampaignCommandHandler.php public function handleAddChannelToCampaignCommand( AddChannelToCampaignCommand $command ) { $channel
= $this->portfolio->getById($command->getChannelId()); $campaign = $this->campaignRepository->load( $command->getCampaignId() ); $campaign->addChannel($channel, $this->aidaMetricsCalculator); $this->campaignRepository->save($campaign); }
// CampaignCommandHandler.php public function handleAddChannelToCampaignCommand( AddChannelToCampaignCommand $command ) { $channel
= $this->portfolio->getById($command->getChannelId()); $campaign = $this->campaignRepository->load( $command->getCampaignId() ); $campaign->addChannel($channel, $this->aidaMetricsCalculator); $this->campaignRepository->save($campaign); }
// CampaignCommandHandler.php public function handleAddChannelToCampaignCommand( AddChannelToCampaignCommand $command ) { $channel
= $this->portfolio->getById($command->getChannelId()); $campaign = $this->campaignRepository->load( $command->getCampaignId() ); $campaign->addChannel($channel, $this->aidaMetricsCalculator); $this->campaignRepository->save($campaign); }
// CampaignCommandHandler.php public function handleAddChannelToCampaignCommand( AddChannelToCampaignCommand $command ) { $channel
= $this->portfolio->getById($command->getChannelId()); $campaign = $this->campaignRepository->load( $command->getCampaignId() ); $campaign->addChannel($channel, $this->aidaMetricsCalculator); $this->campaignRepository->save($campaign); }
// Campaign.php public function addChannel( ChannelInPortfolio $channel, AidaMetricsCalculator $aidaMetricsCalculator )
{ $this->guardCannotModifyOrderedCampaign(); $channelInCampaign = new ChannelInCampaign(/* $args */); $channels = array_merge($this->channels, [$channelInCampaign]); $campaignPrice = $this->calculateCampaignPrice($channels); $estimatedOutcome = $this->calculateEstimatedOutcome($channels); $this->apply(new ChannelAddedToCampaign( $this->id, $channelInCampaign, $campaignPrice, $estimatedOutcome )); }
// Campaign.php public function addChannel( ChannelInPortfolio $channel, AidaMetricsCalculator $aidaMetricsCalculator )
{ $this->guardCannotModifyOrderedCampaign(); $channelInCampaign = new ChannelInCampaign(/* $args */); $channels = array_merge($this->channels, [$channelInCampaign]); $campaignPrice = $this->calculateCampaignPrice($channels); $estimatedOutcome = $this->calculateEstimatedOutcome($channels); $this->apply(new ChannelAddedToCampaign( $this->id, $channelInCampaign, $campaignPrice, $estimatedOutcome )); }
// Campaign.php public function addChannel( ChannelInPortfolio $channel, AidaMetricsCalculator $aidaMetricsCalculator )
{ $this->guardCannotModifyOrderedCampaign(); $channelInCampaign = new ChannelInCampaign(/* $args */); $channels = array_merge($this->channels, [$channelInCampaign]); $campaignPrice = $this->calculateCampaignPrice($channels); $estimatedOutcome = $this->calculateEstimatedOutcome($channels); $this->apply(new ChannelAddedToCampaign( $this->id, $channelInCampaign, $campaignPrice, $estimatedOutcome )); }
// Campaign.php protected function applyChannelAddedToCampaign( ChannelAddedToCampaign $event ) { $this->channels[]
= $event->getChannel(); $this->campaignPrice = $event->getCampaignPrice(); $this->estimatedOutcome = $event- >getEstimatedOutcomeOfCampaign(); $this->isCustomized = true; }
How do we get a listing of the campaigns?
We'll create a read model
Campaign Event Store Campaign Created For Target Group
Campaign Event Store Campaign Created For Target Group Read Model
Store
Campaign Event Store Campaign Created For Target Group Read Model
Store MySQL Read Model Store Redis
Saving the events // Broadway: EventSourcingRepository.php public function save(AggregateRoot $aggregate)
{ // maybe we can get generics one day.... ;) Assert::isInstanceOf($aggregate, $this->aggregateClass); $eventStream = $aggregate->getUncommittedEvents(); $this->eventStore->append( $aggregate->getAggregateRootId(), $eventStream ); $this->eventBus->publish($eventStream); }
Creating read models // CampaignOverviewProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event,
DomainMessage $message ) { $this->repository->save(new CampaignOverview( $event->getCampaignId(), $event->getCompanyId(), $event->getTargetGroup()->getJobTitle(), $message->getRecordedOn() )); }
Creating read models // CampaignOverviewProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event,
DomainMessage $message ) { $this->repository->save(new CampaignOverview( $event->getCampaignId(), $event->getCompanyId(), $event->getTargetGroup()->getJobTitle(), $message->getRecordedOn() )); }
Creating read models // CampaignOverviewProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event,
DomainMessage $message ) { $this->repository->save(new CampaignOverview( $event->getCampaignId(), $event->getCompanyId(), $event->getTargetGroup()->getJobTitle(), $message->getRecordedOn() )); }
Creating read models // CampaignDetailsProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event
) { $campaignDetails = new CampaignDetails( $event->getCampaignId(), $event->getRecruiterId(), $event->getTargetGroup(), $event->getCompanyId(), $event->getRecommendedChannels()->toArray() ); $campaignDetails->updatePrice($event->getCampaignPrice()); $campaignDetails->updateEstimatedOutcome( $event->getEstimatedOutcome() ); $this->repository->save($campaignDetails); }
Creating read models // CampaignDetailsProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event
) { $campaignDetails = new CampaignDetails( $event->getCampaignId(), $event->getRecruiterId(), $event->getTargetGroup(), $event->getCompanyId(), $event->getRecommendedChannels()->toArray() ); $campaignDetails->updatePrice($event->getCampaignPrice()); $campaignDetails->updateEstimatedOutcome( $event->getEstimatedOutcome() ); $this->repository->save($campaignDetails); }
Creating read models // CampaignDetailsProjector.php public function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event
) { $campaignDetails = new CampaignDetails( $event->getCampaignId(), $event->getRecruiterId(), $event->getTargetGroup(), $event->getCompanyId(), $event->getRecommendedChannels()->toArray() ); $campaignDetails->updatePrice($event->getCampaignPrice()); $campaignDetails->updateEstimatedOutcome( $event->getEstimatedOutcome() ); $this->repository->save($campaignDetails); }
Using the history to your advantage
Discard Customizations
// Campaign.php protected function applyCampaignCreatedForTargetGroup( CampaignCreatedForTargetGroup $event ) { $this->id
= $event->getCampaignId(); $this->channels = $event->getRecommendedChannels()->toArray(); $this->campaignPrice = $event->getCampaignPrice(); $this->estimatedOutcome = $event->getEstimatedOutcome(); $this->targetGroup = $event->getTargetGroup(); $this->setInitialRecommendation( $this->channels, $this->estimatedOutcome, $this->campaignPrice ); }
// Campaign.php public function discardCustomization() { $this->guardCannotModifyOrderedCampaign(); if ($this->isCustomized ===
false) { return; } $this->apply(new CustomizationDiscarded( $this->id, $this->initialRecommendation['channels'], $this->initialRecommendation['campaignPrice'], $this->initialRecommendation['estimatedOutcome'] )); }
// Campaign.php protected function applyCustomizationDiscarded( CustomizationDiscarded $event ) { $this->channels
= $event->getRecommendedChannels(); $this->campaignPrice = $event->getCampaignPrice(); $this->estimatedOutcome = $event->getEstimatedOutcome(); $this->isCustomized = false; }
Where are the tests?
Scenario testing
Given When Then
Campaign Created For Target Group Add Channel To Campaign Channel
Added To Campaign
$channelId = new ChannelId('42'); $this->scenario ->given([ new CampaignCreatedForTargetGroup( $this->campaignId, //
$args ) ]) ->when(new AddChannelToCampaignCommand( $this->campaignId, $channelId )) ->then([ new ChannelAddedToCampaign( $this->campaignId, $this->stubbedChannel($channelId), new CampaignPrice(Money::EUR(40000), Money::EUR(0)), new EstimatedOutcome(/* snip */) ) ]);
$channelId = new ChannelId('42'); $this->scenario ->given([ new CampaignCreatedForTargetGroup( $this->campaignId, //
$args ) ]) ->when(new AddChannelToCampaignCommand( $this->campaignId, $channelId )) ->then([ new ChannelAddedToCampaign( $this->campaignId, $this->stubbedChannel($channelId), new CampaignPrice(Money::EUR(40000), Money::EUR(0)), new EstimatedOutcome(/* snip */) ) ]);
$channelId = new ChannelId('42'); $this->scenario ->given([ new CampaignCreatedForTargetGroup( $this->campaignId, //
$args ) ]) ->when(new AddChannelToCampaignCommand( $this->campaignId, $channelId )) ->then([ new ChannelAddedToCampaign( $this->campaignId, $this->stubbedChannel($channelId), new CampaignPrice(Money::EUR(40000), Money::EUR(0)), new EstimatedOutcome(/* snip */) ) ]);
$channelId = new ChannelId('42'); $this->scenario ->given([ new CampaignCreatedForTargetGroup( $this->campaignId, //
$args ) ]) ->when(new AddChannelToCampaignCommand( $this->campaignId, $channelId )) ->then([ new ChannelAddedToCampaign( $this->campaignId, $this->stubbedChannel($channelId), new CampaignPrice(Money::EUR(40000), Money::EUR(0)), new EstimatedOutcome(/* snip */) ) ]);
Alternative scenario test $channelId = new ChannelId('42'); $this->scenario ->given([ new
CampaignCreatedForTargetGroup( $this->campaignId, // $args ) ]) ->when(function (Campaign $campaign) { $campaign->addChannel($channelId) }) ->then([ new ChannelAddedToCampaign( $this->campaignId, $this->stubbedChannel($channelId), new CampaignPrice(Money::EUR(40000), Money::EUR(0)), new EstimatedOutcome(/* snip */) ) ]);
You can do something similar to test your read models
Using the history to correct mistakes
Replaying events to fix read models
Replaying events to create new read models
Very powerful
Very tricky
Replaying events Event Store Read Model Store e v e
n t b u s Read Model Store
Replaying events Event Store Read Model Store e v e
n t b u s Email Notification Processor
Find a solution for your specific problem
Questions? joind.in/16227 freenode: #qandidate github.com/qandidate-labs/broadway
Symfony User Group The Renaissance 10 december http://www.meetup.com/Symfony-User-Group-NL