> Markdown version of [Presence Manager](https://vaadin.com/docs/latest/tools/collaboration/managers/presence-manager). Section index: [llms.txt](https://vaadin.com/docs/latest/tools/llms.txt)

# <a id="ce.presence-manager"></a>Handle User Presence (deprecated since V25.3)

> **Warning:** Collaboration Kit is superseded by [signals](https://vaadin.com/docs/latest/flow/ui-state/shared-signals.md) and is scheduled for removal in Vaadin 26.
>
> See [Migrating from Collaboration Kit to Signals](https://vaadin.com/docs/latest/tools/collaboration/migrating-to-signals.md) for how.

Collaboration Kit includes a manager to set the user presence in a topic, keep track of users who are present, and react to changes in the presence. It provides a simple and flexible way to manage topic data related to user presence, and makes it easy to create custom components with collaborative features.

The following example has a custom component that shows the list of active users in a topic using the presence manager:

`PresenceManagerExample.java`

```java
VerticalLayout users = new VerticalLayout();

UserInfo localUser = new UserInfo("john");

PresenceManager manager = new PresenceManager(users, localUser,
        "my-topic"); // (1)

manager.markAsPresent(true); // (2)

manager.setPresenceHandler(context -> { // (3)
    Component card = createUserCard(context.getUser());
    users.add(card);
    return () -> users.remove(card); // (4)
});
```

1. Creating a `PresenceManager` takes a component to bind the manager connection context to the UI, an instance of `UserInfo` that represents the current local user, and the topic identifier on which to connect.

2. The `markAsPresent()` method is used to configure the manager to mark the local user as present in the topic as soon as a connection is established.

3. The `setPresenceHandler` method sets a callback to handle a new user joining the topic. The `UserInfo` for the new user is provided by the context passed as the argument to the callback.

4. The callback returns another callback, a registration, that’s called to remove the same user when the user leaves the topic.

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