accessorcache.cs

MIED是用于个人帐务管理的小型软件

using System;
using System.Collections;
using Mied.BusinessObject;

namespace Mied.DAL.Accesses
{
    public abstract class AccessorCache : AccessorSelect
    {
        internal AccessorCache(MiedDatabase database, string tableName)
            : base(database, tableName)
        {
        }

        public IList SelectListFromCache()
        {
            this.InitializationCacheList();
            IList list = this.CreateEntityList();
            foreach (Entity entity in this.CacheList)
                list.Add(entity);
            return list;
        }

        public IList CreateCacheList()
        {
            this.InitializationCacheList();
            IList list = this.CreateCacheListObject();
            foreach (Entity entity in this.CacheList)
                list.Add(entity.Clone());
            return list;
        }

        protected abstract IList CreateCacheListObject();

        protected virtual IList GetCacheListSourceList()
        {
            return this.SelectList();
        }

        private void InitializationCacheList()
        {
            if (this.CacheList != null)
                return;

            this.CacheList = this.CreateCacheListObject();
            IList sourceList = this.GetCacheListSourceList();

            foreach (Entity entity in sourceList)
                this.CacheList.Add(entity);
        }

        protected override void OnDatabaseClosed()
        {
            IDisposable disposable = this.CacheList as IDisposable;
            if (disposable != null)
                disposable.Dispose();
            this.CacheList = null;
        }

        private IList CacheList;
    }
}