File: src\LanguageServer\Microsoft.CommonLanguageServerProtocol.Framework\Handlers\InitializedHandler.cs
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Project: src\src\LanguageServer\Protocol\Microsoft.CodeAnalysis.LanguageServer.Protocol.csproj (Microsoft.CodeAnalysis.LanguageServer.Protocol)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
// This is consumed as 'generated' code in a source package and therefore requires an explicit nullable enable
#nullable enable
 
using System;
using System.Threading;
using System.Threading.Tasks;
 
namespace Microsoft.CommonLanguageServerProtocol.Framework.Handlers;
 
[LanguageServerEndpoint("initialized", LanguageServerConstants.DefaultLanguageName)]
internal class InitializedHandler<TRequest, TRequestContext> : INotificationHandler<TRequest, TRequestContext>
{
    private bool HasBeenInitialized = false;
 
    public bool MutatesSolutionState => true;
 
    public Task HandleNotificationAsync(TRequest request, TRequestContext requestContext, CancellationToken cancellationToken)
    {
        if (HasBeenInitialized)
        {
            throw new InvalidOperationException("initialized was called twice");
        }
 
        HasBeenInitialized = true;
 
        return Task.CompletedTask;
    }
}