.NetCore 内置缓存加入到EFCore操作中，数据更新或者查询时自动更新缓存。github地址
2019-04-27 初步完成逻辑代码编写，尚未经过测试，诸多细节有待完善。
2019-04-28 简单功能测试及部分错误逻辑修改。
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace FXY_NetCore_DbContext
{
public class DefaultContext
{
///
/// a queue to save the handle,if will be empted when call savechanges().
///
private ConcurrentQueue CacheQueue { get; set; }
///
/// databse context.
///
private DbContext Context { get; set; }
///
/// netocre inner cache.
///
private IMemoryCache Cache { get; set; }
///
/// the time of cache's life cycle
///
private int ExpirtTime { get; set; } = 10;
///
/// entity context.
///
/// database context
/// cache
/// expirt time,default 60 sencond.
public DefaultContext(DbContext context, IMemoryCache cache, int expirtTime = 10)
{
CacheQueue = new ConcurrentQueue();
Context = context;
Cache = cache;
ExpirtTime = expirtTime;
}
///
/// add entity to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (TEntity entity)
where TEntity : class, new()
{
Context.Add(entity);
}
///
/// add entity list to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (params TEntity[] entities)
where TEntity : class, new()
{
foreach (var item in entities)
Add(item);
}
///
/// remove entity to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (TEntity entity)
where TEntity : class, new()
{
bool reesult = Enqueue(entity);
if (reesult)
Context.Remove(entity);
}
///
/// remove entity list to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (params TEntity[] entities)
where TEntity : class, new()
{
foreach (var item in entities)
Remove(item);
}
///
/// update entity to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (TEntity entity)
where TEntity : class, new()
{
bool reesult = Enqueue(entity);
if (reesult)
Context.Update(entity);
}
///
/// update entity list to database context and add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (params TEntity[] entities)
where TEntity : class, new()
{
foreach (var item in entities)
Update(item);
}
///
/// attach entity to database context add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (TEntity entity)
where TEntity : class, new()
{
bool reesult = Enqueue(entity);
if (reesult)
Context.Attach(entity);
}
///
/// attach entity list to database context add the handle to the queue.
/// it will be excuted when call Savechange().
///
/// (params TEntity[] entities)
where TEntity : class, new()
{
foreach (var item in entities)
Attach(item);
}
///
/// update cache and database.
/// update cache at first,if update cache is failed,return false,else commit the changes to database.
///
///
/// single query.
/// find it in the cache first,return if find it,otherwise search it in database by efcore.
///
/// (string key)
where TEntity : class, new()
{
var result = GetCache(key);
if (result == null)
{
result = Context.Find(key);
var cacheEntity = GetCacheEntity(result);
AddCache(cacheEntity);
}
else
{
var cacheEntity = GetCacheEntity(result);
UpdateCache(cacheEntity);
}
return result;
}
///
/// collection query.
/// do not allow fuzzy query
///
/// Get(string[] keys)
where TEntity : class, new()
{
var result = new List();
foreach (var item in keys)
result.Add(Get(item));
return result;
}
#region private
#region cache queue
///
/// add the handle to the context queue.
///
///
///
private bool Enqueue(object model)
{
CacheEntity entity = GetCacheEntity(model);
if (CacheQueue.TryPeek(out CacheEntity cacheEntity1))
return false;
else
{
CacheQueue.Enqueue(entity);
return CacheQueue.TryPeek(out CacheEntity cacheEntity2);
}
}
///
/// update the changes to cache,and remove it from the cache queue.
/// include add,delete and update.
///
///
/// add cache
///
///
///
/// remove cache.
///
///
///
/// update cache.
///
///
///
/// get cache by key.
///
/// (string key)
where TEntity : class, new()
{
Cache.TryGetValue(key, out object value);
return value as TEntity;
}
#endregion
#region other
///
/// get private cache entity.
///
///
///
///
/// get the key of a entity.
///
///
///
/// a entity to handle cache
///
public sealed class CacheEntity
{
///
/// cache key
///
[Key]
public string key { get; set; }
///
/// cache value
///
public object Value { get; set; }
}
}