/// <summary>
/// Returns true if the entry is intended to internal use.
/// </summary>
public static bool IsInternal(this AbstractServiceEntry self)
{
if (self is null)
{
throw new ArgumentNullException(nameof(self));
}
return(self.Name?.StartsWith(Consts.INTERNAL_SERVICE_NAME_PREFIX, StringComparison.Ordinal) == true);
}
/// <summary>
/// The service was registered via <see cref="IServiceContainerBasicExtensions.Instance(IServiceContainer, Type, string, object, bool)"/> call.
/// </summary>
public static bool IsInstance(this AbstractServiceEntry self)
{
if (self is null)
{
throw new ArgumentNullException(nameof(self));
}
return(self.Lifetime == Lifetime.Instance);
}
/// <summary>
/// The service was registered via <see cref="IServiceContainerBasicExtensions.Service(IServiceContainer, Type, string, Type, Lifetime)"/> call.
/// </summary>
public static bool IsService(this AbstractServiceEntry self)
{
if (self is null)
{
throw new ArgumentNullException(nameof(self));
}
return(self.Implementation != null);
}
/// <summary>
/// The service was registered via <see cref="IServiceContainerBasicExtensions.Factory(IServiceContainer, Type, string, Func{IInjector, Type, object}, Lifetime)"/> call.
/// </summary>
public static bool IsFactory(this AbstractServiceEntry self)
{
if (self is null)
{
throw new ArgumentNullException(nameof(self));
}
return(!self.IsService() && self.Factory != null);
}
/// <summary>
/// Hooks into the instantiating process to let you decorate the original service. Useful when you want to add additional functionality (e.g. parameter validation).
/// </summary>
/// <param name="self">The target <see cref="IServiceContainer"/>.</param>
/// <param name="iface">The service to be decorated.</param>
/// <param name="name">The (optional) name of the service.</param>
/// <param name="decorator">The decorator funtion. It must return the decorated instance. The original instance can be accessed via the 3rd parameter of the decorator function.</param>
/// <returns>The container itself.</returns>
/// <remarks>You can't create proxies against generic, instance or not owned entries. A service can be decorated multiple times.</remarks>
/// <exception cref="InvalidOperationException">When proxying not allowed (see above).</exception>
public static IServiceContainer Proxy(this IServiceContainer self, Type iface, string?name, Func <IInjector, Type, object, object> decorator)
{
if (self == null)
{
throw new ArgumentNullException(nameof(self));
}
if (decorator == null)
{
throw new ArgumentNullException(nameof(decorator));
}
//
// - Get() validalja az "iface" parametert
// - "QueryModes.ThrowOnError" miatt "entry" sose NULL
//
AbstractServiceEntry entry = self.Get(iface, name, QueryModes.AllowSpecialization | QueryModes.ThrowOnError) !;
if (entry.Owner != self)
{
throw new InvalidOperationException(Resources.INAPROPRIATE_OWNERSHIP);
}
if (entry is not ISupportsProxying setter || setter.Factory == null)
{
//
// Generikus szerviz, Abstract(), Instance() eseten a metodus nem ertelmezett.
//
throw new InvalidOperationException(Resources.PROXYING_NOT_SUPPORTED);
}
//
// Bovitjuk a hivasi lancot a decorator-al.
//
Func <IInjector, Type, object> oldFactory = setter.Factory;
setter.Factory = (injector, type) => decorator(injector, type, oldFactory(injector, type));
return(self);
}
