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Copy file name to clipboardExpand all lines: messaging/service-application-configuration.md
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}
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}
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```
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{% hint style="warning" %}
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Service Context is evaluated before container is dumped and cached. Therefore if you will change environment variables after your cache is dumped this won't be changed.\
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\
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This happens because Ecotone tries to maximalize configuration caching, in order to speed up run time execution and do no configuration at that time.
public function placeOrder(PlaceOrderCommand $command) : void
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{
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// do something with $command
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}
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```
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The same way we define for Event Handlers:
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```php
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#[Asynchronous("orders")]
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#[EventHandler(endpointId: "order_was_placed")
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public function when(OrderWasPlaced $event) : void
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{
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// do something with $event
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}
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```
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We need to add **endpointId** on our endpoint's annotation, this will be used to route the Message in isolation to our **Message Handlers**.
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## Message Channel Name
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```php
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#[Asynchronous("orders")]
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```
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The "orders" string is actually a name of our Message Channel. This way we reference to specific implementation which we would like to use. To provide specific implementation like for example Database Channel, we would use **ServiceContext**.
If you're choose [Dbal Message Channel](../../modules/dbal-support.md#message-channel)`Ecotone` will use [Outbox Pattern](../../quick-start-php-ddd-cqrs-event-sourcing/resiliency-and-error-handling.md) to atomically store your changes and published messages.
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{% endhint %}
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{% hint style="info" %}
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Currently available Message Channels are integrated via great library [enqueue](https://github.com/php-enqueue/enqueue).
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{% endhint %}
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{% tabs %}
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{% tab title="Symfony" %}
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```php
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bin/console ecotone:list
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+--------------------+
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| Endpoint Names |
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+--------------------+
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| orders |
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+--------------------+
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```
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{% endtab %}
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{% tab title="Laravel" %}
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```php
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artisan ecotone:list
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+--------------------+
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| Endpoint Names |
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+--------------------+
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| orders |
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+--------------------+
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```
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{% endtab %}
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{% tab title="Lite" %}
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```
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$consumers = $messagingSystem->list()
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```
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{% endtab %}
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{% endtabs %}
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After setting up Pollable Channel we can run the endpoint:
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{% tabs %}
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{% tab title="Symfony" %}
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```php
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bin/console ecotone:run orders -vvv
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```
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{% endtab %}
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{% tab title="Laravel" %}
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```php
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artisan ecotone:run orders -vvv
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```
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{% endtab %}
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{% tab title="Lite" %}
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```php
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$messagingSystem->run("orders");
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```
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{% endtab %}
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{% endtabs %}
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## Running Asychronous Endpoint (PollingMetadata)
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### Dynamic Configuration
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You may set up running configuration for given consumer while running it.
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*`handledMessageLimit` - Amount of messages to be handled before stopping consumer
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*`executionTimeLimit` - How long consumer should run before stopping (milliseconds)
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*`finishWhenNoMessages` - Consumers will be running as long as there will be messages to consume
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*`memoryLimit` - How much memory can be consumed by before stopping consumer (Megabytes)
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*`stopOnFailure` - Stop consumer in case of exception
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{% tabs %}
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{% tab title="Symfony" %}
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```php
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bin/console ecotone:run orders
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--handledMessageLimit=5
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--executionTimeLimit=1000
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--finishWhenNoMessages
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--memoryLimit=512
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--stopOnFailure
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```
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{% endtab %}
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{% tab title="Laravel" %}
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```php
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artisan ecotone:run orders
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--handledMessageLimit=5
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--executionTimeLimit=1000
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--finishWhenNoMessages
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--memoryLimit=512
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--stopOnFailure
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```
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{% endtab %}
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{% tab title="Lite" %}
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```php
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$messagingSystem->run(
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"orders",
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ExecutionPollingMetadata::createWithDefault()
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->withHandledMessageLimit(5)
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->withMemoryLimitInMegabytes(100)
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->withExecutionTimeLimitInMilliseconds(1000)
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->withFinishWhenNoMessages(true)
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->withStopOnError(true)
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);
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```
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{% endtab %}
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{% endtabs %}
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### Static Configuration
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Using [Service Context ](../../messaging/service-application-configuration.md)configuration for statically configuration.
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```php
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class Configuration
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{
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#[ServiceContext]
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public function configuration() : array
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{
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return [
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PollingMetadata::create("orders")
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->setErrorChannelName("errorChannel")
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->setInitialDelayInMilliseconds(100)
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->setMemoryLimitInMegaBytes(100)
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->setHandledMessageLimit(10)
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->setExecutionTimeLimitInMilliseconds(100)
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->withFinishWhenNoMessages(true)
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];
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}
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}
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```
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{% hint style="info" %}
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Dynamic configuration overrides static
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{% endhint %}
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## Multiple Asynchronous Endpoints
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Using single asynchronous channel we may register multiple endpoints. \
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This allow for registering single asynchronous channel for whole Aggregate or group of related Command/Event Handlers. 
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```php
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#[Asynchronous("orders")]
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#[EventHandler]
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public function onSuccess(SuccessEvent $event) : void
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{
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}
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#[Asynchronous("orders")]
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#[EventHandler]
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public function onSuccess(FailureEvent $event) : void
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{
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}
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```
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#### Asynchronous Class
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You may put `Asynchronous` on the class, level so all the endpoints within a class will becomes asynchronous.
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## Intercepting asynchronous endpoint
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All asynchronous endpoints are marked with special attribute`Ecotone\Messaging\Attribute\AsynchronousRunningEndpoint`\
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If you want to [intercept](../extending-messaging-middlewares/interceptors.md) all polling endpoints you should make use of [annotation related point cut](../extending-messaging-middlewares/interceptors.md#pointcut) on this.
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## Endpoint Id
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Each Asynchronous Message Handler requires us to define **"endpointId"**. It's unique identifier of your Message Handler.
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```php
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#[Asynchronous("orders")]
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#[EventHandler(endpointId: "order_was_placed") // Your important endpoint Id
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public function when(OrderWasPlaced $event) : void {}
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```
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Endpoint Id goes in form of Headers to your Message Queue. After Message is consumed from the Queue, Message will be directed to your Message Handler having given endpoint Id. \
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This decouples the Message completely from the Message Handler Class and Method and Command/Event Class. 
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{% hint style="success" %}
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EndpointId ensures we can freely refactor our code and it will be backward compatible with Messages in the Queues. This means we can move the method and class to different namespaces, change the Command class names and as long as **endpointId** is kept the same Message will be delivered correctly. 
We may extend Gateways functionality with asynchronocity. This way we can pass any Message via given Message Channel first.
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{% hint style="success" %}
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Asynchronous Gateways are available as part of **Ecotone Enterprise.**
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{% endhint %}
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## Asynchronous Gateways
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To make Gateway Asynchronous we will use Asynchronous Attribute, just like with Asynchronous Message Handlers. We may can extend any types of Gateways: Command/Event/Query Buses, [Business Interfaces](../command-handling/business-interface/) or custom [Gateways](../../messaging/messaging-concepts/messaging-gateway.md).
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To build for example a **CommandBus** which will send Messages over **async** channel, we will simply [extend a CommandBus interface](../extending-messaging-middlewares/extending-message-buses-gateways.md), and add our method.
then we all Commands that will be triggered via **AsynchronousCommandBus** will go over async channel. 
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{% hint style="success" %}
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It's enough to extend given **CommandBus** with custom interface to register new abstraction in Gateway in Dependency Container. 
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{% endhint %}
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Having **asynchronous CommandBus** is especially useful, if given Message Handler is not meant be executed asynchronous by default.
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```php
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#[CommandHandler]
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public function placeOrder(PlaceOrderCommand $command) : void
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{
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// do something with $command
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}
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```
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then when using standard CommandBus above Command Handler will be executed synchronous, when using AsynchronousCommandBus it will be done asynchronously.
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## Outbox Event Bus
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It's easy to build an Outbox pattern using this Asynchronous Gateways. Just make use of[ Dbal Message Channel](../../modules/dbal-support.md) to push Messages over Database Channel. 
Then whenever we will send Events within Command Handler (which is wrapped in transaction by default while using Dbal Module). Messages will be commited as part of same transaction.
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```php
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#[CommandHandler]
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public function placeOrder(PlaceOrderCommand $command, OutboxEventBus $eventBus) : void
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