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EnableBindingsExtensions.cs
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EnableBindingsExtensions.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Steeltoe.Common.Reflection;
using Steeltoe.Messaging;
using Steeltoe.Stream.Attributes;
using Steeltoe.Stream.Binding;
using Steeltoe.Stream.Messaging;
using System;
using System.Linq;
using System.Reflection;
namespace Steeltoe.Stream.Extensions;
public static class EnableBindingsExtensions
{
public static IServiceCollection AddEnableBinding<T>(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
var type = typeof(T);
var attr = type.GetCustomAttributes(true).SingleOrDefault(attr => attr.GetType() == typeof(EnableBindingAttribute));
if (attr != null)
{
var enableBindingAttribute = (EnableBindingAttribute)attr;
var filtered = enableBindingAttribute.Bindings.Where(b => b.Name != nameof(ISource) && b.Name != nameof(ISink) && b.Name != nameof(IProcessor)).ToArray(); // These are added by default
if (filtered.Length > 0)
{
services.AddStreamBindings(filtered);
}
services.AddStreamListeners(type);
services.TryAddSingleton(type);
}
return services;
}
public static IServiceCollection AddProcessorStreamBinding(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBinding<IProcessor>();
}
public static IServiceCollection AddSinkStreamBinding(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBinding<ISink>();
}
public static IServiceCollection AddSourceStreamBinding(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBinding<ISource>();
}
public static IServiceCollection AddDefaultBindings(this IServiceCollection services)
{
services.AddProcessorStreamBinding();
return services;
}
public static IServiceCollection AddStreamBinding<B>(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBindings(typeof(B));
}
public static IServiceCollection AddStreamBindings<B1, B2>(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBindings(typeof(B1), typeof(B2));
}
public static IServiceCollection AddStreamBindings<B1, B2, B3>(this IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
return services.AddStreamBindings(typeof(B1), typeof(B2), typeof(B3));
}
public static IServiceCollection AddStreamBindings(this IServiceCollection services, params Type[] bindings)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
if (bindings == null || bindings.Length == 0)
{
throw new ArgumentException("Must provide one or more bindings");
}
// Add all the bindings to container
services.AddBindings(bindings);
return services;
}
internal static void AddBindings(this IServiceCollection services, Type[] bindings)
{
// TODO: Verify all binding types unique
foreach (var binding in bindings)
{
// Validate binding interface
if (!binding.IsInterface || !binding.IsPublic || binding.IsGenericType)
{
throw new ArgumentException($"Binding {binding} incorrectly defined");
}
// Add the binding to container
services.AddBinding(binding);
}
}
internal static void AddBinding(this IServiceCollection services, Type binding)
{
AddBindableTargets(services, binding);
// Add the IBindable for this binding (i.e. BindableProxyFactory)
services.AddSingleton<IBindable>((p) =>
{
var bindingTargetFactories = p.GetServices<IBindingTargetFactory>();
return new BindableProxyFactory(binding, bindingTargetFactories);
});
// Add Binding (ISink, IProcessor, IFooBar)
services.AddSingleton(binding, (p) =>
{
// Find the bindabe for this binding
var bindables = p.GetServices<IBindable>();
var bindable = bindables.SingleOrDefault((b) => b.BindingType == binding);
if (bindable == null)
{
throw new InvalidOperationException("Unable to find bindable for binding");
}
return BindingProxyGenerator.CreateProxy((BindableProxyFactory)bindable);
});
var derivedInterfaces = binding.FindInterfaces((t, c) => true, null).ToList();
foreach (var derived in derivedInterfaces)
{
services.AddSingleton(derived, (p) => p.GetService(binding));
}
}
internal static void AddBindableTargets(this IServiceCollection services, Type binding)
{
var bindables = BindingHelpers.CollectBindables(binding);
foreach (var bindable in bindables.Values)
{
// Add bindable defined in a binding
var bindableTargetType = bindable.BindingTargetType;
services.AddSingleton(bindableTargetType, (p) =>
{
var impl = p.GetRequiredService(binding);
var result = bindable.FactoryMethod.Invoke(impl, Array.Empty<object>());
return result;
});
// Also register an IMessageChannel if bindableTargetType is a IMessageChannel
if (bindableTargetType != typeof(IMessageChannel) && typeof(IMessageChannel).IsAssignableFrom(bindableTargetType))
{
services.AddSingleton(typeof(IMessageChannel), (p) =>
{
var impl = p.GetRequiredService(binding);
var result = bindable.FactoryMethod.Invoke(impl, Array.Empty<object>());
return result;
});
}
}
}
}