Provide required callback targets

sharwell · sharwell · commit e0e3655dd23d · 2020-09-28T10:16:16.000-07:00
diff --git a/src/Workspaces/Core/Portable/FindSymbols/Declarations/DeclarationFinder_AllDeclarations.cs b/src/Workspaces/Core/Portable/FindSymbols/Declarations/DeclarationFinder_AllDeclarations.cs
@@ -44,7 +44,7 @@ public static async Task<ImmutableArray<ISymbol>> FindAllDeclarationsWithNormalQ
                 var result = await client.TryInvokeAsync<IRemoteSymbolFinderService, ImmutableArray<SerializableSymbolAndProjectId>>(
                     solution,
                     (service, solutionInfo, cancellationToken) => service.FindAllDeclarationsWithNormalQueryAsync(solutionInfo, project.Id, query.Name, query.Kind, criteria, cancellationToken),
-                    callbackTarget: null,
+                    callbackTarget: SymbolFinder.EmptyServerCallback.Instance,
                     cancellationToken).ConfigureAwait(false);
 
                 if (!result.HasValue)
diff --git a/src/Workspaces/Core/Portable/FindSymbols/Declarations/DeclarationFinder_SourceDeclarations.cs b/src/Workspaces/Core/Portable/FindSymbols/Declarations/DeclarationFinder_SourceDeclarations.cs
@@ -47,7 +47,7 @@ public static async Task<ImmutableArray<ISymbol>> FindSourceDeclarationsWithNorm
                 var result = await client.TryInvokeAsync<IRemoteSymbolFinderService, ImmutableArray<SerializableSymbolAndProjectId>>(
                     solution,
                     (service, solutionInfo, cancellationToken) => service.FindSolutionSourceDeclarationsWithNormalQueryAsync(solutionInfo, name, ignoreCase, criteria, cancellationToken),
-                    callbackTarget: null,
+                    callbackTarget: SymbolFinder.EmptyServerCallback.Instance,
                     cancellationToken).ConfigureAwait(false);
 
                 if (!result.HasValue)
@@ -86,7 +86,7 @@ public static async Task<ImmutableArray<ISymbol>> FindSourceDeclarationsWithNorm
                 var result = await client.TryInvokeAsync<IRemoteSymbolFinderService, ImmutableArray<SerializableSymbolAndProjectId>>(
                     project.Solution,
                     (service, solutionInfo, cancellationToken) => service.FindProjectSourceDeclarationsWithNormalQueryAsync(solutionInfo, project.Id, name, ignoreCase, criteria, cancellationToken),
-                    callbackTarget: null,
+                    callbackTarget: SymbolFinder.EmptyServerCallback.Instance,
                     cancellationToken).ConfigureAwait(false);
 
                 if (!result.HasValue)
@@ -120,7 +120,7 @@ public static async Task<ImmutableArray<ISymbol>> FindSourceDeclarationsWithPatt
                 var result = await client.TryInvokeAsync<IRemoteSymbolFinderService, ImmutableArray<SerializableSymbolAndProjectId>>(
                     solution,
                     (service, solutionInfo, cancellationToken) => service.FindSolutionSourceDeclarationsWithPatternAsync(solutionInfo, pattern, criteria, cancellationToken),
-                    callbackTarget: null,
+                    callbackTarget: SymbolFinder.EmptyServerCallback.Instance,
                     cancellationToken).ConfigureAwait(false);
 
                 if (!result.HasValue)
@@ -154,7 +154,7 @@ public static async Task<ImmutableArray<ISymbol>> FindSourceDeclarationsWithPatt
                 var result = await client.TryInvokeAsync<IRemoteSymbolFinderService, ImmutableArray<SerializableSymbolAndProjectId>>(
                     project.Solution,
                     (service, solutionInfo, cancellationToken) => service.FindProjectSourceDeclarationsWithPatternAsync(solutionInfo, project.Id, pattern, criteria, cancellationToken),
-                    callbackTarget: null,
+                    callbackTarget: SymbolFinder.EmptyServerCallback.Instance,
                     cancellationToken).ConfigureAwait(false);
 
                 if (!result.HasValue)
diff --git a/src/Workspaces/Core/Portable/FindSymbols/SymbolFinder.EmptyServerCallback.cs b/src/Workspaces/Core/Portable/FindSymbols/SymbolFinder.EmptyServerCallback.cs
@@ -0,0 +1,50 @@
+﻿// 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.Threading.Tasks;
+using Microsoft.CodeAnalysis.Remote;
+using Microsoft.CodeAnalysis.Text;
+using Roslyn.Utilities;
+
+namespace Microsoft.CodeAnalysis.FindSymbols
+{
+    public static partial class SymbolFinder
+    {
+        internal sealed class EmptyServerCallback : IRemoteSymbolFinderService.ICallback
+        {
+            public static readonly EmptyServerCallback Instance = new();
+
+            private EmptyServerCallback()
+            {
+            }
+
+            public ValueTask AddItemsAsync(int count)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask ItemCompletedAsync()
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnLiteralReferenceFoundAsync(DocumentId documentId, TextSpan span)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnCompletedAsync()
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnDefinitionFoundAsync(SerializableSymbolAndProjectId definition)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnFindInDocumentCompletedAsync(DocumentId documentId)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnFindInDocumentStartedAsync(DocumentId documentId)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnReferenceFoundAsync(SerializableSymbolAndProjectId definition, SerializableReferenceLocation reference)
+                => throw ExceptionUtilities.Unreachable;
+
+            public ValueTask OnStartedAsync()
+                => throw ExceptionUtilities.Unreachable;
+        }
+    }
+}
