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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
          • Custom Features
          • Non-Ecotone Application integration
          • Testing
        • AMQP Distributed Bus (RabbitMQ)
          • Configuration
        • Distributed Bus Interface
      • Message Consumer
      • Message Publisher
    • 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
      • Laravel Configuration
      • Database Connection (DBAL Module)
      • Eloquent
      • Laravel Queues
      • Laravel Octane
    • Ecotone Lite
      • Logging
      • Database Connection (DBAL Module)
    • 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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On this page
  • Scalar Headers
  • Converting Scalars on the Message Endpoint
  • Class Headers
  • Dealing with Collections

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  1. Messaging and Ecotone In Depth
  2. Method Invocation And Conversion
  3. Conversion

Headers Conversion

Ecotone allows for serialization of Message Headers before they go the Message Channel (Queue).

Scalar Headers

When we are sending Message Headers as simple scalar types like string or integer, then no Conversion is needed. In those situations Message Headers will be passed as they are.

// execution
$commandBus->send(
   $command,
   metadata: [
      'executorId' => '1234'
   ]
)

This can be then accessed on the Message Handler level:

#[Asynchronous('async')]
#[CommandHandler]
public function placeOrder(
   PlaceOrderCommand $command,
   #[Header('executorId')] string $executorId
)
{
   // do something
}

Converting Scalars on the Message Endpoint

Even so if Header was sent as scalar, we still can convert it to Application specific object on the Message Handler level.

#[Asynchronous('async')]
#[CommandHandler]
public function placeOrder(
   PlaceOrderCommand $command,
   #[Header('executorId')] ExecutorId $executorId
)
{
   // do something
}

For this we do need a Converter, which will state how given Class should be deserialized from string to ExecutorId object.

class ExampleConverterService
{
    #[Converter] 
    public function convert(string $data) : ExecutorId
    {
        return ExecutorId::fromString($data);
    }
}

Class Headers

We may actually want to pass Headers in more meaningful representation than simple scalars and let Ecotone do serialization when given Message goes to Message Channel (Queue).

$commandBus->send(
   $command,
   metadata: [
      'executorId' => ExecutorId::fromString('1234')
   ]
)

For this we need Conversion from ExecutorId to string, for Ecotone to know how to serialize it before it will go to Asynchronous Channel.

class ExampleConverterService
{
    #[Converter] 
    public function convert(ExecutorId $data) : string
    {
        return $data->toString();
    }
}

Dealing with Collections

There may be cases, when simple PHP to PHP Conversion will not be enough. This may be for example, when we will be dealing with Collection of Classes.

$commandBus->send(
   $command,
   metadata: [
      'types' => [
         OrderType::fromString('quick-delivery'),
         OrderType::fromString('promotion'),
      ]
   ]
)

In those cases Ecotone will fallback to serialize Message Header to JSON. This way we can serialize even most complex Headers.

Then on the receiving side:

/**
* @param OrderType[] $types
*/
#[Asynchronous('async')]
#[CommandHandler]
public function placeOrder(
   PlaceOrderCommand $command,
   #[Header('types')] array $types
)
{
   // do something
}
PreviousPayload ConversionNextService (Application) Configuration

Last updated 1 year ago

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Actually the Docblock is crucial here, as it tell Ecotone what Collection type we are dealing with. This way Ecotone will be able to pass is to your defined to deserialize it.

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