// 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.
 
using System.Collections.Generic;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.FindSymbols.SymbolTree
{
    internal sealed partial class SymbolTreeInfoCacheServiceFactory
    {
        private readonly struct MetadataInfo
        {
            /// <summary>
            /// Can't be null.  Even if we weren't able to read in metadata, we'll still create an empty
            /// index.
            /// </summary>
            public readonly SymbolTreeInfo SymbolTreeInfo;
 
            /// <summary>
            /// The set of projects that are referencing this metadata-index.  When this becomes empty we can dump the
            /// index from memory.
            /// </summary>
            /// <remarks>
            /// <para>Accesses to this collection must lock the set.</para>
            /// </remarks>
            public readonly HashSet<ProjectId> ReferencingProjects;
 
            public MetadataInfo(SymbolTreeInfo info, HashSet<ProjectId> referencingProjects)
            {
                Contract.ThrowIfNull(info);
                SymbolTreeInfo = info;
                ReferencingProjects = referencingProjects;
            }
        }
    }
}