Event handler
Sendbird's Chat SDK for Flutter provides three types of event handlers for client apps: channel event handlers, user event handlers, and connection event handlers. Through the channel event handlers and user event handlers, the Sendbird server notifies client apps in the foreground of events that are happening in channels and with users. Through the connection event handler, the Sendbird server detects changes in the connection status of a client app. When the client app is disconnected from the server, the SDK tries to reconnect to the server and notifies the client app of the result through the connection event handler.
The Chat SDK communicates with our server through persistent WebSocket connections and multi-thread processing, receiving callbacks of asynchronous channel, user, and connection events through event handlers in real-time. This interaction enables you to track the events you desire and implement your own chat features associated with those events.
Functionalities by event handlers
The following is a list of event handler functionalities that our Chat SDK provides.
Managing a channel event handler
| Functionality | Description | Open channel | Group channel |
|---|---|---|---|
Adds or removes an event handler that receives information about events happening in channels from the Sendbird server. |
Managing a user event handler
| Functionality | Description | Open channel | Group channel |
|---|---|---|---|
Adds or removes an event handler that receives information about events related to users connected to the Sendbird server. |
Managing a connection event handler
| Functionality | Description | Open channel | Group channel |
|---|---|---|---|
Adds or removes an event handler that receives information about changes related to the Sendbird server connection status. |