public static InterceptorAggregator <TInterceptor> GetAggregator(IInterceptors interceptors)
{
System.Diagnostics.Debug.Assert(interceptors != null);
if (AggregatorGetter is null)
{
SetAggregatorGetter(interceptors);
}
System.Diagnostics.Debug.Assert(AggregatorGetter != null);
return(AggregatorGetter(interceptors));
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public DiagnosticsLogger(
[NotNull] ILoggerFactory loggerFactory,
[NotNull] ILoggingOptions loggingOptions,
[NotNull] DiagnosticSource diagnosticSource,
[NotNull] LoggingDefinitions loggingDefinitions,
[CanBeNull] IInterceptors interceptors = null)
{
DiagnosticSource = diagnosticSource;
Definitions = loggingDefinitions;
Logger = loggerFactory.CreateLogger(new TLoggerCategory());
Options = loggingOptions;
Interceptors = interceptors;
}
/// <summary>
/// From the <see cref="IInterceptors"/> object, returns the aggregator of interceptors of the given type.
/// </summary>
private InterceptorAggregator <TInterceptor> GetAggregator(IInterceptors interceptors)
{
var aggregator = ReflectionCache.GetAggregator(interceptors);
return(aggregator);
}
// Local function that creates and assigns the compiled getter
static void SetAggregatorGetter(IInterceptors theInterceptors)
{
lock (Lock)
{
if (AggregatorGetter != null)
{
return;
}
try
{
// Check everything with slow reflection once
var aggregatorsField = theInterceptors.GetType().GetField("_aggregators", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public) ??
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators does not exist.");
if (!typeof(IReadOnlyDictionary <Type, IInterceptorAggregator>).IsAssignableFrom(aggregatorsField.FieldType))
{
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators is of unexpected type {aggregatorsField.FieldType.Name}.");
}
var aggregators = (IReadOnlyDictionary <Type, IInterceptorAggregator>?)aggregatorsField.GetValue(theInterceptors) ??
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators contains a null value.");
if (!aggregators.TryGetValue(typeof(TInterceptor), out var aggregator))
{
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators did not contain an aggregator for {typeof(TInterceptor).Name}.");
}
if (aggregator is null)
{
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators contained a null aggregator for {typeof(TInterceptor).Name}.");
}
if (aggregator is not InterceptorAggregator <TInterceptor> typedAggregator)
{
throw new Exception($"Field {theInterceptors.GetType().Name}._aggregators contained an aggregator for {typeof(TInterceptor).Name} of unexpected type {aggregator.GetType().Name}.");
}
// Compile a fast expression tree
// Omit the checks, trusting that things will be the same in the future
{
var indexerMethod = typeof(IReadOnlyDictionary <Type, IInterceptorAggregator>).GetMethod("get_Item") ??
throw new Exception($"Type {typeof(IReadOnlyDictionary<Type, IInterceptorAggregator>).Name} does not have a single public indexer.");
// IInterceptors interceptors;
var param = Expression.Parameter(typeof(IInterceptors), "interceptors");
// (Interceptors)interceptors;
var convertedParam = Expression.Convert(param, theInterceptors.GetType());
// ((Interceptors)interceptors)._aggregators;
var aggregatorDictionary = Expression.Field(convertedParam, aggregatorsField);
var interceptorType = Expression.Constant(typeof(TInterceptor));
// _aggregators[typeof(TInterceptor)]
var interceptionAggregator = Expression.Call(aggregatorDictionary, indexerMethod, interceptorType);
// (InterceptorAggregator<TInterceptor>)_aggregators[typeof(TInterceptor)]
var convertedInterceptionAggregator = Expression.Convert(interceptionAggregator, typeof(InterceptorAggregator <TInterceptor>));
var lambda = Expression.Lambda <Func <IInterceptors, InterceptorAggregator <TInterceptor> > >(convertedInterceptionAggregator, param);
AggregatorGetter = lambda.Compile();
}
}
catch (Exception e)
{
throw ThrowHelper.ThrowIncompatibleWithEfVersion(e);
}
}
}
