/// <summary>
/// 创建缓存策略
/// </summary>
/// <param name="context">控制器上下文</param>
/// <param name="action">Action 信息</param>
/// <param name="parameters">Action 参数</param>
/// <returns>缓存策略</returns>
protected override CachePolicy CreateCachePolicy(ControllerContext context, ActionDescriptor action, IDictionary <string, object> parameters)
{
var httpMethod = context.HttpContext.Request.HttpMethod;
if (!httpMethod.EqualsIgnoreCase("get") && !httpMethod.EqualsIgnoreCase("header"))//如果不是GET或Header请求，都不予缓存。
{
return(null);
}
//如果存在 Cacheable 筛选器，则不再提供默认策略。
if (action.GetCustomAttributes(typeof(CacheableAttribute), true).Any() || action.ControllerDescriptor.GetCustomAttributes(typeof(CacheableAttribute), true).Any())
{
return(null);
}
ControllerCachePolicyProvider provider = GetControllerProvider(MvcEnvironment.GetAreaName(context), action.ControllerDescriptor.ControllerName);
if (provider != null)
{
var policy = provider.CreateCachePolicy(context, action, parameters);
if (policy != null)
{
return(policy);
}
}
return(MvcEnvironment.CreateCachePolicy(context, action, parameters));
}
/// <summary>
/// 注册控制器缓存策略提供程序
/// </summary>
/// <param name="provider">缓存策略提供程序</param>
public void RegisterCacheProvider( ControllerCachePolicyProvider provider, string controllerName, string areaName = null )
{
lock ( _providersSync )
{
var name = areaName + "." + controllerName;
if ( _providers.ContainsKey( name ) )
{
if ( string.IsNullOrEmpty( areaName ) )
throw new InvalidOperationException( string.Format( "已经为控制器 \"{0}\" 注册了缓存策略提供程序", controllerName ) );
else
throw new InvalidOperationException( string.Format( "已经为区域 \"{1}\" 的控制器 \"{0}\" 注册了缓存策略提供程序", controllerName, areaName ) );
}
_providers.Add( name, provider );
}
}
/// <summary>
/// 注册控制器缓存策略提供程序
/// </summary>
/// <param name="provider">缓存策略提供程序</param>
public void RegisterCacheProvider(ControllerCachePolicyProvider provider, string controllerName, string areaName = null)
{
lock ( _providersSync )
{
var name = areaName + "." + controllerName;
if (_providers.ContainsKey(name))
{
if (string.IsNullOrEmpty(areaName))
{
throw new InvalidOperationException(string.Format("已经为控制器 \"{0}\" 注册了缓存策略提供程序", controllerName));
}
else
{
throw new InvalidOperationException(string.Format("已经为区域 \"{1}\" 的控制器 \"{0}\" 注册了缓存策略提供程序", controllerName, areaName));
}
}
_providers.Add(name, provider);
}
}
