public ErrorsSnapshotFactory(IDiagnosticService diagnosticService, DocumentId documentId)
{
_diagnosticService = diagnosticService;
_documentId = documentId;
_workQueue = new AsynchronousSerialWorkQueue(new AsynchronousOperationListener());
_currentSnapshot = new ErrorsSnapshot(ImmutableArray <MappedDiagnostic> .Empty, 0);
}
private async Task UpdateCurrentSnapshotAsync(CancellationToken cancellationToken)
{
var diagnostics = await _diagnosticService
.GetDiagnosticsAsync(_documentId, cancellationToken)
.ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
var snapshot = new ErrorsSnapshot(
diagnostics,
_currentSnapshot.VersionNumber + 1);
_currentSnapshot = snapshot;
}