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ASP.NET MVC controller action with Interceptor pattern

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2 Oct 2012CPOL8 min read 67.6K   924   24  
This article is to demonstrate interceptor pattern with MVC controller action, and so action can be intercepted in controller classes without using action filters.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcCallInterceptors.Interceptors
{
    public class InterceptorExecutionContext
    {
        IEnumerable<ActionInterceptor> _interceptors;
        IList<ActionInterceptor> _readOnlyinterceptors;
        IList<InterceptorExecutionStatus> _interceptorsExecutionStatus;
        IDictionary<string, object> _interceptorsParameters;
        InterceptorParasDictionary<string, object> _actionParameters;
        ControllerContext context;
        ActionInterceptor _currentActionInterceptor;
        string _chainofExecutionTerminationMessage;

        internal InterceptorExecutionContext(ControllerContext context, IEnumerable<ActionInterceptor> interceptors, IDictionary<string, object> parameters)
        {
            if (interceptors == null)
            {
                throw new ArgumentNullException("interceptors");
            }

            _interceptorsParameters = new Dictionary<string, object>();
            _interceptors = interceptors;
            _readOnlyinterceptors = interceptors.ToList().AsReadOnly();
            _interceptorsExecutionStatus = new List<InterceptorExecutionStatus>(_readOnlyinterceptors.Count);
            Exceptions = new List<Exception>();
            for (int i = 0; i < _readOnlyinterceptors.Count; i++)
                _interceptorsExecutionStatus.Add(InterceptorExecutionStatus.Pending);
            _actionParameters = new InterceptorParasDictionary<string, object>(parameters);
        }

        internal void SetInterceptorStatus(InterceptorExecutionStatus interceptorExecutionStatus)
        {
            _interceptorsExecutionStatus[ActionInterceptors.IndexOf(CurrentInterceptor)] = interceptorExecutionStatus;
        }

        internal InterceptorExecutionStatus GetInterceptorStatus()
        {
            return _interceptorsExecutionStatus[ActionInterceptors.IndexOf(CurrentInterceptor)];

        }        

        public InterceptorParasDictionary<string, object> ActionParameters
        {
            get { return _actionParameters; }
        }

        internal string ChainofExecutionTerminationMessage
        {
            get { return _chainofExecutionTerminationMessage; }
        }

        public List<Exception> Exceptions { get; set; }       

        public object InterceptorResult { get; set; }

        /// <summary>
        /// This would terminate whole execution chain but send result to the client up till evaluated by previous methods
        /// </summary>
        public bool CancelAllExecutions { get; set; }

        public void CancelAllExecutionsWithTerminationMessage(string terminationMessage)
        {
            CancelAllExecutions = true;
            _chainofExecutionTerminationMessage = terminationMessage;
        }

        public IList<ActionInterceptor> ActionInterceptors
        {
            get { return _readOnlyinterceptors; }
        }     
      
        public ControllerContext ControllerContext
        {
            get { return context; }
        }

        public ActionInterceptor CurrentInterceptor
        {
            get
            {
                if (_currentActionInterceptor == null) 
                {
                    throw new Exception("No interceptor in execution state.");
                }
                return _currentActionInterceptor;
            }
            internal set
            {
                _currentActionInterceptor = value;
            }

        }

        public ActionInterceptor ActionInterceptor
        {
            get
            {
                throw new System.NotImplementedException();
            }
            set
            {
            }
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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India India
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