private Task <StrongBox <ImmutableArray <DiagnosticData> > > DeserializeAsync(DiagnosticDataSerializer serializer, object documentOrProject, object key, string stateKey, CancellationToken cancellationToken)
{
// when VS is loading new solution, we will try to find out all diagnostics persisted from previous VS session.
// in that situation, it is possible that we have a lot of deserialization returning empty result. previously we used to
// return default(ImmutableArray) for such case, but it turns out async/await framework has allocation issues with returning
// default(value type), so we are using StrongBox to return no data as null. async/await has optimization where it will return
// cached empty task if given value is null for reference type. (see AsyncMethodBuilder.GetTaskForResult)
//
// right now, we can't use Nullable either, since it is not one of value type the async/await will reuse cached task. in future,
// if they do, we can change it to return Nullable<ImmutableArray>
//
// after initial deserialization, we track actual document/project that actually have diagnostics so no data won't be a common
// case.
// check cache first
if (InMemoryStorage.TryGetValue(_owner.Analyzer, (key, stateKey), out var entry) && serializer.Version == entry.Version)
{
if (entry.Diagnostics.Length == 0)
{
// if there is no result, use cached task
return(s_emptyResultTaskCache);
}
return(Task.FromResult(new StrongBox <ImmutableArray <DiagnosticData> >(entry.Diagnostics)));
}
// try to deserialize it
return(serializer.DeserializeAsync(documentOrProject, stateKey, cancellationToken));
}
public async Task SerializationTest_Document()
{
using (var workspace = new TestWorkspace(TestExportProvider.ExportProviderWithCSharpAndVisualBasic, workspaceKind: "DiagnosticDataSerializerTest"))
{
var document = workspace.CurrentSolution.AddProject("TestProject", "TestProject", LanguageNames.CSharp).AddDocument("TestDocument", "");
var diagnostics = new[]
{
new DiagnosticData(
"test1", "Test", "test1 message", "test1 message format",
DiagnosticSeverity.Info, DiagnosticSeverity.Info, false, 1,
ImmutableArray <string> .Empty, ImmutableDictionary <string, string> .Empty,
workspace, document.Project.Id, new DiagnosticDataLocation(document.Id,
new TextSpan(10, 20), "originalFile1", 30, 30, 40, 40, "mappedFile1", 10, 10, 20, 20)),
new DiagnosticData(
"test2", "Test", "test2 message", "test2 message format",
DiagnosticSeverity.Warning, DiagnosticSeverity.Warning, true, 0,
ImmutableArray.Create <string>("Test2"), ImmutableDictionary <string, string> .Empty.Add("propertyKey", "propertyValue"),
workspace, document.Project.Id, new DiagnosticDataLocation(document.Id,
new TextSpan(30, 40), "originalFile2", 70, 70, 80, 80, "mappedFile2", 50, 50, 60, 60), title: "test2 title", description: "test2 description", helpLink: "http://test2link"),
new DiagnosticData(
"test3", "Test", "test3 message", "test3 message format",
DiagnosticSeverity.Error, DiagnosticSeverity.Warning, true, 2,
ImmutableArray.Create <string>("Test3", "Test3_2"), ImmutableDictionary <string, string> .Empty.Add("p1Key", "p1Value").Add("p2Key", "p2Value"),
workspace, document.Project.Id, new DiagnosticDataLocation(document.Id,
new TextSpan(50, 60), "originalFile3", 110, 110, 120, 120, "mappedFile3", 90, 90, 100, 100), title: "test3 title", description: "test3 description", helpLink: "http://test3link"),
}.ToImmutableArray();
var utcTime = DateTime.UtcNow;
var analyzerVersion = VersionStamp.Create(utcTime);
var version = VersionStamp.Create(utcTime.AddDays(1));
var key = "document";
var serializer = new DiagnosticDataSerializer(analyzerVersion, version);
Assert.True(await serializer.SerializeAsync(document, key, diagnostics, CancellationToken.None).ConfigureAwait(false));
var recovered = await serializer.DeserializeAsync(document, key, CancellationToken.None);
AssertDiagnostics(diagnostics, recovered);
}
}
