Created
June 18, 2011 11:39
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CRUD action provider
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/// <summary> | |
/// The class representing an action info, with its <see cref="ActionMethodSelectorAttribute"/> retrieved. | |
/// </summary> | |
/// <remarks> | |
/// For performance optimization, cache this class instances. | |
/// </remarks> | |
public sealed class ActionInfo | |
{ | |
private readonly ActionMethodSelectorAttribute[] _attributes; | |
public ActionInfo(MethodInfo methodInfo) | |
{ | |
MethodInfo = methodInfo; | |
_attributes = | |
MethodInfo.GetCustomAttributes(typeof (ActionMethodSelectorAttribute), true).Cast | |
<ActionMethodSelectorAttribute>().ToArray(); | |
} | |
public MethodInfo MethodInfo { get; private set; } | |
public bool IsValid(ControllerContext ctx) | |
{ | |
for (var i = 0; i < _attributes.Length; i++) | |
{ | |
if (!_attributes[i].IsValidForRequest(ctx, MethodInfo)) | |
return false; | |
} | |
return true; | |
} | |
} |
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/// <summary> | |
/// A class containing actions provided for any controller being <see cref="IEntityController{TEntity}"/>. | |
/// </summary> | |
/// <remarks> | |
/// The action implementations relies on a binder automatically updating the passed entity, for instance: | |
/// <see cref="Edit(System.Web.Mvc.ControllerContext,TEntity)"/> simply redirects the user to the index action, | |
/// as the update onto an entity was made by the model binder. Additionally, a transaction is handled by a global action filter. | |
/// </remarks> | |
public static class CrudActions<TEntity, TId> | |
{ | |
[HttpGet] | |
public static ActionResult Add(ControllerContext ctx, TEntity entity) | |
{ | |
return ctx.CreateViewResult(entity); | |
} | |
[HttpPost] | |
public static ActionResult Add(ControllerContext ctx, TEntity entity, ISession session) | |
{ | |
session.Save(entity); | |
return ctx.CreateViewResult(entity); | |
} | |
[HttpGet] | |
public static ActionResult Details(ControllerContext ctx, TId id, ISession session) | |
{ | |
var entity = session.Get(typeof(TEntity), id); | |
if (entity == null) | |
return ctx.RedirectToAction("Index"); | |
return ctx.CreateViewResult(entity); | |
} | |
[HttpGet] | |
public static ActionResult Edit(ControllerContext ctx, TId id, ISession session) | |
{ | |
var entity = session.Get(typeof(TEntity), id); | |
if (entity == null) | |
return ctx.RedirectToAction("Index"); | |
return ctx.CreateViewResult(entity); | |
} | |
[HttpPost] | |
public static ActionResult Edit(ControllerContext ctx, TEntity entity) | |
{ | |
// post | |
// nothing to do, entity is updated | |
return ctx.RedirectToAction("Index"); | |
} | |
} |
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/// <summary> | |
/// The CRUD action provider, using <see cref="CrudActions{TEntity,TId}"/> to provide basic CRUD operations. | |
/// </summary> | |
public class DetachedActionProvider : IActionProvider | |
{ | |
private readonly ISessionFactory _factory; | |
private static readonly ActionInfo[] EmptyInfos = new ActionInfo[0]; | |
private readonly ReaderWriterCache<TypeNameKey, ActionInfo[]> _controllerWithActionNameToActions; | |
public DetachedActionProvider(ISessionFactory factory) | |
{ | |
_factory = factory; | |
_controllerWithActionNameToActions = new ReaderWriterCache<TypeNameKey, ActionInfo[]>(); | |
} | |
public ActionDescriptor FindAction(ControllerContext ctx, ControllerDescriptor descriptor, string action) | |
{ | |
var actions = _controllerWithActionNameToActions.FetchOrCreate(new TypeNameKey(descriptor.ControllerType, action), | |
GetActions); | |
for (var i = 0; i < actions.Length; i++) | |
{ | |
var a = actions[i]; | |
if (a.IsValid(ctx)) | |
return ReflectedMvc.DescriptorCreator(a.MethodInfo, action, descriptor); | |
} | |
return null; | |
} | |
private ActionInfo[] GetActions(TypeNameKey controllerTypeWithActionName) | |
{ | |
var controller = controllerTypeWithActionName.Type; | |
var actionName = controllerTypeWithActionName.Name; | |
var entityType = TryFindEntityType(controller); | |
if (entityType == null) | |
return EmptyInfos; | |
var metadata = _factory.GetClassMetadata(entityType); | |
if (metadata.IsInherited) | |
return EmptyInfos; | |
var detachedActions = typeof(CrudActions<,>).MakeGenericType(entityType, metadata.IdentifierType.ReturnedClass); | |
return detachedActions | |
.GetMethods(BindingFlags.Public | BindingFlags.Static) | |
.Where(m => StringComparer.InvariantCultureIgnoreCase.Compare(m.Name, actionName) == 0) | |
.Select(m => new ActionInfo(m)) | |
.ToArray(); | |
} | |
private static Type TryFindEntityType(Type controllerType) | |
{ | |
var entityControllers = controllerType.GetInterfaces() | |
.Where(t => t.IsGenericType && t.GetGenericTypeDefinition() == typeof(IEntityController<>)); | |
if (entityControllers.Count() > 1) | |
{ | |
throw new InvalidOperationException("That's insane to edit two types of entities in one controller"); | |
} | |
var i = entityControllers.FirstOrDefault(); | |
return i == null ? null : i.GetGenericArguments()[0]; | |
} | |
} |
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/// <summary> | |
/// The markup interface, providing information about which entity type is covered by this controller. | |
/// </summary> | |
/// <typeparam name="TEntity"></typeparam> | |
public interface IEntityController<TEntity> | |
{ | |
} |
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/// <summary> | |
/// Here you can find a plenty of nasty code, which was needed because of MVC internalization policy. | |
/// </summary> | |
public static class ReflectedMvc | |
{ | |
public readonly static Func<MethodInfo, string, ControllerDescriptor, ReflectedActionDescriptor> DescriptorCreator; | |
static ReflectedMvc( ) | |
{ | |
DescriptorCreator = CreateDescriptorCreator(); | |
} | |
private static Func<MethodInfo, string, ControllerDescriptor, ReflectedActionDescriptor> CreateDescriptorCreator() | |
{ | |
var ctor = typeof(ReflectedActionDescriptor).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, | |
new[] | |
{ | |
typeof (MethodInfo), | |
typeof (string), | |
typeof (ControllerDescriptor), | |
typeof (bool) | |
}, | |
null); | |
var p1 = Expression.Parameter(typeof(MethodInfo)); | |
var p2 = Expression.Parameter(typeof(string)); | |
var p3 = Expression.Parameter(typeof(ControllerDescriptor)); | |
var p4 = Expression.Constant(false, typeof(bool)); | |
return Expression.Lambda<Func<MethodInfo, string, ControllerDescriptor, ReflectedActionDescriptor>>( | |
Expression.New(ctor, p1, p2, p3, p4), p1, p2, p3) | |
.Compile(); | |
} | |
} |
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