/// <summary>
/// Loads an <see cref="IInterceptor"/> derived class into a particular <see cref="IServiceContainer"/> instance
/// so that the current interceptor type can intercept calls made to services created from the given
/// target container.
/// </summary>
/// <param name="input">The interceptor type.</param>
/// <returns>By default, this will always return an empty set of container actions. The actual interceptor itself will be injected at the end of the postprocessor chain.</returns>
public IEnumerable <Action <IServiceContainer> > Load(Type input)
{
var typeInstance = Activator.CreateInstance(input);
var interceptor = typeInstance as IInterceptor;
Func <IServiceRequestResult, IInterceptor> getInterceptor = null;
// Return the interceptor by default
if (interceptor != null)
{
getInterceptor = result =>
{
var target = result.ActualResult;
var container = result.Container;
var methodInvoke = container.GetService <IMethodInvoke <MethodInfo> >();
var factory = container.GetService <IProxyFactory>();
// Manually initialize the interceptor
var initialize = interceptor as IInitialize;
if (initialize != null)
{
initialize.Initialize(container);
}
return(new Redirector(() => target, interceptor, factory, methodInvoke));
};
}
if (typeInstance != null && typeInstance is IAroundInvoke)
{
// Convert the IAroundInvoke instance into
// a running interceptor
var aroundInvoke = typeInstance as IAroundInvoke;
getInterceptor = result =>
{
var container = result.Container;
var methodInvoke = container.GetService <IMethodInvoke <MethodInfo> >();
var factory = container.GetService <IProxyFactory>();
// Manually initialize the interceptor
var initialize = aroundInvoke as IInitialize;
if (initialize != null)
{
initialize.Initialize(container);
}
// HACK: The adapter can't be created until runtime since
// the aroundInvoke instance needs an actual target
var target = result.ActualResult;
var adapter = new AroundInvokeAdapter(() => target,
methodInvoke, aroundInvoke);
var redirector = new Redirector(() => target, adapter, factory, methodInvoke);
return(redirector);
};
}
// The type must implement either the IInterceptor interface
// or the IAroundInvoke interface
if (getInterceptor == null)
{
return(new Action <IServiceContainer> [0]);
}
// Determine which service types should be intercepted
var attributes =
from attribute in input.GetCustomAttributes(typeof(InterceptsAttribute), false)
let currentAttribute = attribute as InterceptsAttribute
where currentAttribute != null
select currentAttribute;
var interceptedTypes = new Dictionary <Type, HashSet <string> >();
foreach (var attribute in attributes)
{
var serviceName = attribute.ServiceName;
var serviceType = attribute.TargetType;
// Keep track of the service name and service type
// and mark the current type for interception
// using the current interceptor
if (!interceptedTypes.ContainsKey(serviceType))
{
interceptedTypes[serviceType] = new HashSet <string>();
}
if (!interceptedTypes[serviceType].Contains(serviceName))
{
interceptedTypes[serviceType].Add(serviceName);
}
}
// There must be at least one InterceptsAttribute defined on
// the input type
if (interceptedTypes.Count == 0)
{
return(new Action <IServiceContainer> [0]);
}
// Match the service type with the current type
Func <IServiceRequestResult, bool> filter = request =>
{
var container = request.Container;
// There must be a valid proxy factory
if (container == null ||
!container.Contains(typeof(IProxyFactory)))
{
return(false);
}
var serviceType = request.ServiceType;
// Ignore requests to intercept IMethodInvoke<MethodInfo>
if (serviceType == typeof(IMethodInvoke <MethodInfo>))
{
return(false);
}
// Sealed types cannot be proxied by default
if (serviceType.IsSealed)
{
return(false);
}
// Match any service name if the service name is blank
if (request.ServiceName == null &&
interceptedTypes.ContainsKey(serviceType))
{
return(true);
}
// Match the service name and type
if (interceptedTypes.ContainsKey(serviceType) &&
interceptedTypes[serviceType].Contains(
request.ServiceName))
{
return(true);
}
if (!serviceType.IsGenericType)
{
return(false);
}
// Determine if an interceptor can intercept the
// entire family of generic types
var baseDefinition =
serviceType.GetGenericTypeDefinition();
// The list of intercepted types should contain
// the generic type definition and its matching
// service name
var serviceName = request.ServiceName;
return(interceptedTypes.ContainsKey(baseDefinition) &&
interceptedTypes[baseDefinition].Contains(
serviceName));
};
// Create the proxy using the service request
Func <IServiceRequestResult, object> createProxy = request => CreateProxyFrom(request, getInterceptor);
// Place the interceptor at the end of the
// postprocessor chain
var injector = new ProxyInjector(filter, createProxy);
_loaderHost.Plugins.Add(new ProxyContainerPlugin(injector));
return(new Action <IServiceContainer> [0]);
}
/// <summary>
/// Loads an <see cref="IInterceptor"/> derived class into a particular <see cref="IServiceContainer"/> instance
/// so that the current interceptor type can intercept calls made to services created from the given
/// target container.
/// </summary>
/// <param name="input">The interceptor type.</param>
/// <returns>By default, this will always return an empty set of container actions. The actual interceptor itself will be injected at the end of the postprocessor chain.</returns>
public IEnumerable<Action<IServiceContainer>> Load(Type input)
{
object typeInstance = Activator.CreateInstance(input);
var interceptor = typeInstance as IInterceptor;
Func<IServiceRequestResult, IInterceptor> getInterceptor = null;
// Return the interceptor by default
if (interceptor != null)
{
getInterceptor = result =>
{
var target = result.ActualResult;
var container = result.Container;
var methodInvoke = container.GetService<IMethodInvoke<MethodInfo>>();
var factory = container.GetService<IProxyFactory>();
// Manually initialize the interceptor
var initialize = interceptor as IInitialize;
if (initialize != null)
initialize.Initialize(container);
return new Redirector(() => target, interceptor, factory, methodInvoke);
};
}
if (typeInstance != null && typeInstance is IAroundInvoke)
{
// Convert the IAroundInvoke instance into
// a running interceptor
var aroundInvoke = typeInstance as IAroundInvoke;
getInterceptor = result =>
{
var container = result.Container;
var methodInvoke = container.GetService<IMethodInvoke<MethodInfo>>();
var factory = container.GetService<IProxyFactory>();
// Manually initialize the interceptor
var initialize = aroundInvoke as IInitialize;
if (initialize != null)
initialize.Initialize(container);
// HACK: The adapter can't be created until runtime since
// the aroundInvoke instance needs an actual target
var target = result.ActualResult;
var adapter = new AroundInvokeAdapter(() => target,
methodInvoke, aroundInvoke);
var redirector = new Redirector(() => target, adapter, factory, methodInvoke);
return redirector;
};
}
// The type must implement either the IInterceptor interface
// or the IAroundInvoke interface
if (getInterceptor == null)
return new Action<IServiceContainer>[0];
// Determine which service types should be intercepted
var attributes = from attribute in input.GetCustomAttributes(typeof(InterceptsAttribute), false)
let currentAttribute = attribute as InterceptsAttribute
where currentAttribute != null
select currentAttribute;
var interceptedTypes = new Dictionary<Type, HashSet<string>>();
foreach (var attribute in attributes)
{
var serviceName = attribute.ServiceName;
var serviceType = attribute.TargetType;
// Keep track of the service name and service type
// and mark the current type for interception
// using the current interceptor
if (!interceptedTypes.ContainsKey(serviceType))
interceptedTypes[serviceType] = new HashSet<string>();
if (!interceptedTypes[serviceType].Contains(serviceName))
interceptedTypes[serviceType].Add(serviceName);
}
// There must be at least one InterceptsAttribute defined on
// the input type
if (interceptedTypes.Count == 0)
return new Action<IServiceContainer>[0];
// Match the service type with the current type
Func<IServiceRequestResult, bool> filter = request =>
{
var container = request.Container;
// There must be a valid proxy factory
if (container == null || !container.Contains(typeof(IProxyFactory)))
return false;
var serviceType = request.ServiceType;
// Ignore requests to intercept IMethodInvoke<MethodInfo>
if (serviceType == typeof(IMethodInvoke<MethodInfo>))
return false;
// Sealed types cannot be proxied by default
if (serviceType.IsSealed)
return false;
// Match any service name if the service name is blank
if (request.ServiceName == null && interceptedTypes.ContainsKey(serviceType))
return true;
// Match the service name and type
if (interceptedTypes.ContainsKey(serviceType) &&
interceptedTypes[serviceType].Contains(request.ServiceName))
return true;
if (!serviceType.IsGenericType)
return false;
// Determine if an interceptor can intercept the
// entire family of generic types
var baseDefinition = serviceType.GetGenericTypeDefinition();
// The list of intercepted types should contain
// the generic type definition and its matching
// service name
var serviceName = request.ServiceName;
return interceptedTypes.ContainsKey(baseDefinition) && interceptedTypes[baseDefinition].Contains(serviceName);
};
// Create the proxy using the service request
Func<IServiceRequestResult, object> createProxy = request => CreateProxyFrom(request, getInterceptor);
// Place the interceptor at the end of the
// postprocessor chain
var injector = new ProxyInjector(filter, createProxy);
_loaderHost.Plugins.Add(new ProxyContainerPlugin(injector));
return new Action<IServiceContainer>[0];
}
/// <summary>
/// Initializes the class with the given <see cref="ProxyInjector"/> instance.
/// </summary>
/// <param name="injector">The postprocessor that will inject proxies in place of actual service requests.</param>
internal ProxyContainerPlugin(ProxyInjector injector)
{
_injector = injector;
}
/// <summary>
/// Initializes the class with the given <see cref="ProxyInjector"/> instance.
/// </summary>
/// <param name="injector">The postprocessor that will inject proxies in place of actual service requests.</param>
internal ProxyContainerPlugin(ProxyInjector injector)
{
_injector = injector;
}