GS2-Gateway SDK for Game Engine API Reference

Specifications of models and API references for GS2-Gateway SDK for Game Engine

Models

EzWebSocketSession

WebSocketSession

A WebSocket session is a persistent connection between a GS2 server and a client for real-time bidirectional communication. The client registers a user ID as an identifier to the server.

	Type	Required	Value Limits	Description
connectionId	string	✓	~ 128 chars	Connection ID The unique identifier assigned to this WebSocket connection. Used to identify the specific client connection when sending notifications.
namespaceName	string	✓	~ 128 chars	Namespace name
userId	string	✓	~ 128 chars	User ID

Methods

setUserId

Links the current WebSocket connection to the player’s user ID so that the server can send real-time push notifications to this client. This is typically called right after the player logs in and connects to the server — without this step, the server won’t know which connection belongs to which player. The allowConcurrentAccess flag controls whether the same player can be connected from multiple devices at once:

true: allows multiple simultaneous connections (e.g., playing on both phone and tablet)
false: only one connection per player is allowed (e.g., to prevent duplicate logins — the old connection gets kicked) Use this as part of your game’s login/initialization flow to enable features like real-time chat notifications, friend request alerts, or match-found notifications.

Request

	Type	Condition	Required	Default	Value Limits	Description
namespaceName	string		✓		~ 128 chars	Namespace name
gameSession	GameSession		✓			GameSession
allowConcurrentAccess	bool			true		Whether to allow connections from different clients at the same time
sessionId	string	{allowConcurrentAccess} == false			~ 128 chars	Specifies a session ID that allows reconnection when allowConcurrentAccess is false and the existing connection has the same session ID. * Enabled only if allowConcurrentAccess is false

Result

	Type	Description
item	EzWebSocketSession	WebSocket session updated

Implementation Example

    var domain = gs2.Gateway.Namespace(
        namespaceName: "$hash"
    ).Me(
        gameSession: GameSession
    ).WebSocketSession(
    );
    var result = await domain.SetUserIdAsync(
        allowConcurrentAccess: true,
        sessionId: null
    );
    var item = await result.ModelAsync();

    var domain = gs2.Gateway.Namespace(
        namespaceName: "$hash"
    ).Me(
        gameSession: GameSession
    ).WebSocketSession(
    );
    var future = domain.SetUserIdFuture(
        allowConcurrentAccess: true,
        sessionId: null
    );
    yield return future;
    if (future.Error != null)
    {
        onError.Invoke(future.Error, null);
        yield break;
    }
    var future2 = future.Result.ModelFuture();
    yield return future2;
    if (future2.Error != null)
    {
        onError.Invoke(future2.Error, null);
        yield break;
    }
    var result = future2.Result;

    const auto Domain = Gs2->Gateway->Namespace(
        "$hash" // namespaceName
    )->Me(
        GameSession
    )->WebSocketSession(
    );
    const auto Future = Domain->SetUserId(
        true // allowConcurrentAccess
        // sessionId
    );
    Future->StartSynchronousTask();
    if (Future->GetTask().IsError())
    {
        return false;
    }

    // obtain changed values / result values
    const auto Future2 = Future->GetTask().Result()->Model();
    Future2->StartSynchronousTask();
    if (Future2->GetTask().IsError())
    {
        return Future2->GetTask().Error();
    }
    const auto Result = Future2->GetTask().Result();