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  • About
  • Installation
  • How to use
    • CQRS PHP
    • Event Handling PHP
    • Aggregates & Sagas
    • Scheduling in PHP
    • Asynchronous PHP
    • Event Sourcing PHP
    • Microservices PHP
    • Resiliency and Error Handling
    • Laravel Demos
    • Symfony Demos
      • Doctrine ORM
  • Tutorial
    • Before we start tutorial
    • Lesson 1: Messaging Concepts
    • Lesson 2: Tactical DDD
    • Lesson 3: Converters
    • Lesson 4: Metadata and Method Invocation
    • Lesson 5: Interceptors
    • Lesson 6: Asynchronous Handling
  • Enterprise
  • Modelling
    • Introduction
    • Message Bus and CQRS
      • CQRS Introduction - Commands
        • Query Handling
        • Event Handling
      • Aggregate Introduction
        • Aggregate Command Handlers
        • Aggregate Query Handlers
        • Aggregate Event Handlers
        • Advanced Aggregate creation
      • Repositories Introduction
      • Business Interface
        • Introduction
        • Business Repository
        • Database Business Interface
          • Converting Parameters
          • Converting Results
      • Saga Introduction
      • Identifier Mapping
    • Extending Messaging (Middlewares)
      • Message Headers
      • Interceptors (Middlewares)
        • Additional Scenarios
      • Intercepting Asynchronous Endpoints
      • Extending Message Buses (Gateways)
    • Event Sourcing
      • Installation
      • Event Sourcing Introduction
        • Working with Event Streams
        • Event Sourcing Aggregates
          • Working with Aggregates
          • Applying Events
          • Different ways to Record Events
        • Working with Metadata
        • Event versioning
        • Event Stream Persistence
          • Event Sourcing Repository
          • Making Stream immune to changes
          • Snapshoting
          • Persistence Strategies
          • Event Serialization and PII Data (GDPR)
      • Projection Introduction
        • Configuration
        • Choosing Event Streams for Projection
        • Executing and Managing
          • Running Projections
          • Projection CLI Actions
          • Access Event Store
        • Projections with State
        • Emitting events
    • Recovering, Tracing and Monitoring
      • Resiliency
        • Retries
        • Error Channel and Dead Letter
          • Dbal Dead Letter
        • Idempotent Consumer (Deduplication)
        • Resilient Sending
        • Outbox Pattern
        • Concurrency Handling
      • Message Handling Isolation
      • Ecotone Pulse (Service Dashboard)
    • Asynchronous Handling and Scheduling
      • Asynchronous Message Handlers
      • Asynchronous Message Bus (Gateways)
      • Delaying Messages
      • Time to Live
      • Message Priority
      • Scheduling
      • Dynamic Message Channels
    • Distributed Bus and Microservices
      • Distributed Bus
        • Distributed Bus with Service Map
          • Configuration
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          • Non-Ecotone Application integration
          • Testing
        • AMQP Distributed Bus (RabbitMQ)
          • Configuration
        • Distributed Bus Interface
      • Message Consumer
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    • Business Workflows
      • The Basics - Stateless Workflows
      • Stateful Workflows - Saga
      • Handling Failures
    • Testing Support
      • Testing Messaging
      • Testing Aggregates and Sagas with Message Flows
      • Testing Event Sourcing Applications
      • Testing Asynchronous Messaging
  • Messaging and Ecotone In Depth
    • Overview
    • Multi-Tenancy Support
      • Getting Started
        • Any Framework Configuration
        • Symfony and Doctrine ORM
        • Laravel
      • Different Scenarios
        • Hooking into Tenant Switch
        • Shared and Multi Database Tenants
        • Accessing Current Tenant in Message Handler
        • Events and Tenant Propagation
        • Multi-Tenant aware Dead Letter
      • Advanced Queuing Strategies
    • Document Store
    • Console Commands
    • Messaging concepts
      • Message
      • Message Channel
      • Message Endpoints/Handlers
        • Internal Message Handler
        • Message Router
        • Splitter
      • Consumer
      • Messaging Gateway
      • Inbound/Outbound Channel Adapter
    • Method Invocation And Conversion
      • Method Invocation
      • Conversion
        • Payload Conversion
        • Headers Conversion
    • Service (Application) Configuration
    • Contributing to Ecotone
      • How Ecotone works under the hood
      • Ecotone Phases
      • Registering new Module Package
      • Demo Integration with SQS
        • Preparation
        • Inbound and Outbound Adapters and Message Channel
        • Message Consumer and Publisher
  • Modules
    • Overview
    • Symfony
      • Symfony Configuration
      • Symfony Database Connection (DBAL Module)
      • Doctrine ORM
      • Symfony Messenger Transport
    • Laravel
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    • Ecotone Lite
      • Logging
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    • JMS Converter
    • OpenTelemetry (Tracing and Metrics)
      • Configuration
    • RabbitMQ Support
    • Kafka Support
      • Configuration
      • Message partitioning
      • Usage
    • DBAL Support
    • Amazon SQS Support
    • Redis Support
  • Other
    • Contact, Workshops and Support
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  • Setting up Projections
  • Document Store

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  1. Modelling
  2. Event Sourcing
  3. Projection Introduction

Configuration

Setting up Projections

Projections are about deriving current state from the stream of events. Projections can be added in any moment of the application lifetime and be built up from existing history, till the current time. This is powerful concept as it allow for building views quickly and discarding them without pain, when they are not longer needed.

#[Projection("inProgressTicketList", Ticket::class] // 1
class InProgressTicketList
{
    public function __construct(private Connection $connection) {}

    #[EventHandler] // 2
    public function addTicket(TicketWasRegistered $event, array $metadata) : void
    {
        $result = $this->connection->executeStatement(<<<SQL
    INSERT INTO in_progress_tickets VALUES (?,?)
SQL, [$event->getTicketId(), $event->getTicketType()]);
    }

    #[QueryHandler("getInProgressTickets")] // 3
    public function getTickets() : array
    {
        return $this->connection->executeQuery(<<<SQL
    SELECT * FROM in_progress_tickets
SQL)->fetchAllAssociative();
    }    
}
  1. This tells Ecotone that specific class is Projection. The first parameter is the name of the projection and the second is name of the stream (the default is the name of the Aggregate) that this projection subscribes to.

  2. Events that this projection subscribes to

  3. Optional Query Handlers for this projection. They can be placed in different classes depending on preference.

Document Store

#[Projection(self::NAME, Account::class)]
final class AvailableBalanceProjection
{
    const NAME = "available_balance";
    const QUERY = "getCurrentBalance";

    public function __construct(private DocumentStore $documentStore) {}

    #[EventHandler]
    public function whenAccountSetup(AccountSetup $event): void
    {
        $this->documentStore->addDocument(
            self::NAME,
            $event->accountId,
            ["balance" => 0]
        );
    }

    #[EventHandler]
    public function whenPaymentMade(PaymentMade $event): void
    {
        $this->documentStore->updateDocument(
            self::NAME,
            $event->accountId,
            ["balance" => $this->getCurrentBalance($event->accountId) + $event->amount]
        );
    }

    #[QueryHandler(self::QUERY)]
    public function getCurrentBalance(UuidInterface $accountId): int
    {
        return $this->documentStore->getDocument(self::NAME, $accountId)["balance"];
    }
}
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Last updated 5 months ago

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is a great way to set up your projections. You can freely create DTO objects, or play with simple arrays and Ecotone will serialize/deserialize and store them for you.

For testing purposes you may use , to speed up your tests or to simple test things out locally.

Document Store
In Memory implementation