FactoryLifetimeDescriptor
using Stashbox.Registration;
using Stashbox.Resolution;
using System;
using System.Linq.Expressions;
namespace Stashbox.Lifetime
{
public abstract class FactoryLifetimeDescriptor : LifetimeDescriptor
{
private protected override Expression BuildLifetimeAppliedExpression(ServiceRegistration serviceRegistration, ResolutionContext resolutionContext, Type requestedType)
{
Func<IResolutionScope, IRequestContext, object> factoryDelegateForRegistration = GetFactoryDelegateForRegistration(serviceRegistration, resolutionContext, requestedType);
if (factoryDelegateForRegistration != null)
return ApplyLifetime(factoryDelegateForRegistration, serviceRegistration, resolutionContext, requestedType);
return null;
}
private static Func<IResolutionScope, IRequestContext, object> GetFactoryDelegateForRegistration(ServiceRegistration serviceRegistration, ResolutionContext resolutionContext, Type requestedType)
{
if (!LifetimeDescriptor.IsRegistrationOutputCacheable(serviceRegistration, resolutionContext))
return GetNewFactoryDelegate(serviceRegistration, resolutionContext.BeginSubGraph(), requestedType);
Func<IResolutionScope, IRequestContext, object> cachedFactory = resolutionContext.GetCachedFactory(serviceRegistration.RegistrationId);
if (cachedFactory != null)
return cachedFactory;
cachedFactory = GetNewFactoryDelegate(serviceRegistration, resolutionContext.BeginSubGraph(), requestedType);
resolutionContext.CacheFactory(serviceRegistration.RegistrationId, cachedFactory);
return cachedFactory;
}
private static Func<IResolutionScope, IRequestContext, object> GetNewFactoryDelegate(ServiceRegistration serviceRegistration, ResolutionContext resolutionContext, Type requestedType)
{
Expression expressionForRegistration = LifetimeDescriptor.GetExpressionForRegistration(serviceRegistration, resolutionContext, requestedType);
if (expressionForRegistration == null)
return null;
return expressionForRegistration.CompileDelegate(resolutionContext, resolutionContext.CurrentContainerContext.ContainerConfiguration);
}
protected abstract Expression ApplyLifetime(Func<IResolutionScope, IRequestContext, object> factory, ServiceRegistration serviceRegistration, ResolutionContext resolutionContext, Type resolveType);
}
}