> For the complete documentation index, see [llms.txt](https://docs.ecotone.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ecotone.tech/messaging/multi-tenancy-support/different-scenarios/hooking-into-tenant-switch.md).

# Hooking into Tenant Switch

Hooking into tenant switch for custom tenant initialization

If we already have Multi-Tenant application running, most likely we are using some custom libraries or integration. In such cases, it may be required to trigger some code when given Tenant is activated or deactivated.

**Ecotone opens possibility to hook into the process of Tenant switch**, where it can provide Connection that is going to be activated and the Tenant name.

```php
final readonly class HookTenantSwitchSubscription
{
    /** Hooking in tenant activation */
    #[OnTenantActivation]
    public function whenActivated(
        string|ConnectionReference $tenantConnectionName, 
        #[Header('tenant')] $tenantName
    ): void
    {
        echo sprintf("HOOKING into flow: Tenant name %s is about to be activated\n", $tenantName);
    }

    /** Hooking in tenant deactivation */
    #[OnTenantDeactivation]
    public function whenDeactivated(
        string|ConnectionReference $tenantConnectionName, 
        #[Header('tenant')] $tenantName
    ): void
    {
        echo sprintf("HOOKING into flow: Tenant name %s is about to be deactivated\n", $tenantName);
    }
}
```

{% hint style="success" %}
Ecotone follows declarative configuration. This means that we mostly going to state what we want to achieve by marking methods with Attributes. This way we can focus on business part of the system, instead of configuration and setups.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.ecotone.tech/messaging/multi-tenancy-support/different-scenarios/hooking-into-tenant-switch.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.