Cache Handler

Below is a CacheHandler that might be useful to store data in cache objects so rather than returning the data from db, we can return it from the Cache objects

// CacheHanlder.cs

using XYZProject.Infrastructure.Constants;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Web;

using System.Web.Caching;

using System.Web.Configuration;

namespace XYZProject.Infrastructure.EventHandlers

{

    public static class CacheHandler

    {

        /// <summary>

        /// Returns ExpirationMinutes from Web.config

        /// </summary>

        private static int ExpirationMinutes

        {

            get

            {

                return ToInt32(WebConfigurationManager.AppSettings["CacheExpirationMinutes"]);

            }

        }

        public static object GetValue(string key)

        {

            return HttpContext.Current.Cache[key];

        }

        public static void ClearCache(string key)

        {

            HttpContext.Current.Cache.Remove(key);

        }

        /// <summary>

        /// Clears all service cache for Profile and Framework service methods

        /// </summary>

        /// <param name="userGuid"></param>

        public static void ClearAllServiceCache(Guid userGuid)

        {

            List<string> getAllCacheKeyMembers = CacheConstants.GetAllCacheKeyMembers();

            foreach (string item in getAllCacheKeyMembers)

            {

                string key = item + userGuid;

                HttpContext.Current.Cache.Remove(key);

            }

        }

        /// <summary>

        /// Sets Cache Vaue with an Absolute Expiration

        /// If expirationMinutes is 0, then it gets the expirationMinutes value from the Web.config

        /// </summary>

        /// <param name="key"></param>

        /// <param name="value"></param>

        /// <param name="expirationMinutes"></param>

        public static void SetValueWithAbsoluteExpiration(string key, object value, int expirationMinutes = 0)

        {

            if (expirationMinutes == 0)

            {

                expirationMinutes = ExpirationMinutes;

            }

            HttpContext.Current.Cache.Insert(key, value, null, DateTime.Now.AddMinutes(expirationMinutes), Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);

        }

        public static void SetValueWithNoExpiration(string Key, object value)

        {

            HttpContext.Current.Cache.Insert(Key, value);

        }

        #region [ Int Converter ]

        private static bool Assigned(this object o)

        {

            if (o is string)

                return !string.IsNullOrEmpty((string)o);

            return (o != null);

        }

        public static Int32 ToInt32(object value, Int32 defaultValue)

        {

            Int32 retVal = defaultValue;

            if (value.Assigned())

            {

                Int32.TryParse(Convert.ToString(value), out retVal);

            }

            return retVal;

        }

        public static Int32 ToInt32(object value)

        {

            return ToInt32(value, 0);

        }

        #endregion

    }

}

// CacheConstants.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace XYZProject.Infrastructure.Constants

{

    public static class CacheConstants

    {

        public static class ProfileServiceCacheKeyMember

        {

            public const string GetProfileViewModelAsync = "GetProfileViewModelAsync_";

            public const string GetSkillsAsync = "GetSkillsAsync_";

            public const string GetProfileAsync = "GetProfileAsync_";

            public const string GetProfileModelAsync = "GetProfileModelAsync_";

            public const string GetPreferencesAsync = "GetPreferencesAsync_";

            public const string GetNonCertifiedQualificationsAsync = "GetNonCertifiedQualificationsAsync_";

            public const string GetPhotoAsync = "GetPhotoAsync_";

            public const string GetInterestsAsync = "GetInterestsAsync_";

            public const string GetAboutMeAsync = "GetAboutMeAsync_";

            public const string GetAccessLevelsAsync = "GetAccessLevelsAsync_";

            public const string GetAwardsAsync = "GetAwardsAsync_";

            public const string GetContactDetailsAsync = "GetContactDetailsAsync_";

            public const string GetCurriculumInterestsAsync = "GetCurriculumInterestsAsync_";

            public const string GetNationalitiesAsync = "GetNationalitiesAsync_";

            public const string GetEthnicitiesAsync = "GetEthnicitiesAsync_";

            public const string GetGendersAsync = "GetGendersAsync_";

        }

        public static class FrameworkServiceCacheKeyMember

        {

            public const string GetProgrammeRegistrationsAsync = "GetProgrammeRegistrationsAsync_";

            public const string GetComponentProgrammesAsync = "GetComponentProgrammesAsync_";

            public const string GetEventProgrammesAsync = "GetEventProgrammesAsync_";

            public const string GetEventRegistrationAsync = "GetEventRegistrationAsync_";

            public const string GetEventRegistrationsAsync = "GetEventRegistrationsAsync_";

            public const string GetEventStructureAsync = "GetEventStructureAsync_";

            public const string GetEvidenceAsync = "GetEvidenceAsync_";

            public const string GetEvidencesAsync = "GetEvidencesAsync_";

            public const string GetProgrammeProgrammesAsync = "GetProgrammeProgrammesAsync_";

            public const string GetProgrammeStructureAsync = "GetProgrammeStructureAsync_";

        }

        public static List<string> GetAllCacheKeyMembers()

        {

            List<string> cacheKeyMembers = new List<string>();

            Type typeProfileServiceCacheKeyMember = typeof(ProfileServiceCacheKeyMember);

            foreach (var p in typeProfileServiceCacheKeyMember.GetFields())

            {

                var v = p.GetValue(null); //static classes cannot be instanced, so use null...

                cacheKeyMembers.Add(v.ToString());

            }

            Type typeFrameworkServiceCacheKeyMember = typeof(FrameworkServiceCacheKeyMember);

            foreach (var p in typeFrameworkServiceCacheKeyMember.GetFields())

            {

                var v = p.GetValue(null); //static classes cannot be instanced, so use null...

                cacheKeyMembers.Add(v.ToString());

            }

            return cacheKeyMembers.Distinct().ToList();

        }

    }

}