public ServiceProvider(IEnumerable <ServiceDescriptor> serviceDescriptors)
{
_root = this;
_table = new ServiceTable(serviceDescriptors);
_table.Add(typeof(IServiceProvider), new ServiceProviderService());
_table.Add(typeof(IServiceScopeFactory), new ServiceScopeService());
_table.Add(typeof(IEnumerable <>), new OpenIEnumerableService(_table));
}
internal static Func <ServiceProvider, object> RealizeService(ServiceTable table, Type serviceType, IServiceCallSite callSite)
{
var callCount = 0;
return(provider =>
{
if (Interlocked.Increment(ref callCount) == 2)
{
Task.Run(() =>
{
var providerExpression = Expression.Parameter(typeof(ServiceProvider), "provider");
var lambdaExpression = Expression.Lambda <Func <ServiceProvider, object> >(
callSite.Build(providerExpression),
providerExpression);
table.RealizedServices[serviceType] = lambdaExpression.Compile();
});
}
return callSite.Invoke(provider);
});
}
// This constructor is called exclusively to create a child scope from the parent
internal ServiceProvider(ServiceProvider parent)
{
_root = parent._root;
_table = parent._table;
}
public OpenIEnumerableService(ServiceTable table)
{
_table = table;
}
