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Microservices PHP

Distributed Services PHP

Distribution
Ecotone provides support for communication in distributed architecture. 
The support covers sending command directly to specific service (application) or publishing events, that specific services may listen for. 
Configuration
In order for Ecotone how to route messages you need to register Service Name (Application Name).
​Symfony Service Name Configuration​
​Laravel Service Name Configuration​
​Ecotone Lite Service Name Configuration 
Modules Providing Support
​RabbitMQ Module​
Distribution Bus
Distribution Bus is Message Gateway just like CommandBus or EventBus. 
The bus is responsible for distribution of your command and events. 

Depending on your Module configuration you can inject it by class name or specific reference name.
interface DistributedBus
{
// Command distribution
​
    public function sendCommand(string $destination, string $routingKey, string $command, string $sourceMediaType = MediaType::TEXT_PLAIN, array $metadata = []) : void;
​
    public function convertAndSendCommand(string $destination, string $routingKey, object|array $command, array $metadata = []) : void;
​
// Event distribution
​
    public function publishEvent(string $routingKey, string $event, string $sourceMediaType = MediaType::TEXT_PLAIN, array $metadata = []) : void;
​
    public function convertAndPublishEvent(string $routingKey, object|array $event, array $metadata) : void;
    
// general message distribution
​
    public function sendMessage(string $destination, string $targetChannelName, string $payload, string $sourceMediaType = MediaType::TEXT_PLAIN, array $metadata = []): void;    
}
Commands
Sending Distributed Commands
destination - is a Service Name of targeted Service
routingKey - is a routing key under which CommandHandler is registered on targeted Service
public function changeBillingDetails(DistributedBus $distributedCommandBus)
{
    $distributedCommandBus->sendCommand(
        "billing", // destination
        "billing.changeDetails", // routingKey
        '["personId":"123","billingDetails":"01111"]',
        "application/json"
    );
}
Consuming distributed command
On the consumer side register distributed command handler
#[Distributed]
#[CommandHandler("billing.changeDetails")]
public function changeBillingDetails(ChangeBillingDetails $command) : void
{
    // do something with billing details
}
To expose command handler for service distribution mark it with Distributed attribute.
Run the consumer
Run consumer for your registered distributed consumer. It will be available under your Service Name​
List:
Symfony
Laravel
Lite
bin/console ecotone:list
+--------------------+
| Endpoint Names     |
+--------------------+
| billings           |
+--------------------+
artisan ecotone:list
+--------------------+
| Endpoint Names     |
+--------------------+
| billing            |
+--------------------+
$consumers = $messagingSystem->list()
Run it:
Symfony
Laravel
Lite
bin/console ecotone:run billing -vvv
artisan ecotone:run billing -vvv
$messagingSystem->run("billing");
Events
Publishing Distributed Events
routingKey - is a routing key under which event will be published
public function changeBillingDetails(DistributedBus $eventBus)
{
    $eventBus->publishEvent(
        "billing.detailsWereChanged", // routingKey
         '{"personId":123,"billingDetails":0001}',
         "application/json" 
    );
}
Consuming Distributed Events
#[Distributed]
#[EventHandler("billing.detailsWereChanged")]
public function registerTicket(BillingDetailsWereChanged $event) : void
{
    // do something with event
}
To start listening for distributed events under specific key, provide Distributed attribute.
Run the consumer
It's the same consumer, so we run it just like distributed command bus.
Message
You may distribute general message, if you don't want to include given endpoint as Command or Event Handler.
Publishing Distributed Messages
destination - is a Service Name of targeted Service
targetChannelName - is a target channel on the destination side
public function changeBillingDetails(DistributedBus $distributedCommandBus)
{
    $distributedCommandBus->sendCommand(
        "billing", // destination
        "billing.changeDetails", // targetChannelName
        '["personId":"123","billingDetails":"01111"]',
        "application/json"
    );
}
Consuming Distributed Messages
We register general Message Handler using Service Activator.
#[Distributed]
#[ServiceActivator("billing.changeDetails")]
public function changeBillingDetails(ChangeBillingDetails $command) : void
{
    // do something with billing details
}
Run the consumer
It's the same consumer, so we run it just like distributed command bus.