/// <summary>
/// 找出当前的命令信息
/// </summary>
/// <typeparam name="TCommand">信息类型</typeparam>
/// <param name="command">信息</param>
/// <param name="communication">上下文通讯</param>
/// <returns></returns>
protected CommandExcutingElement FindCommandExcutingElement <TCommand>(TCommand command, HandlerCommunication communication) where TCommand : ICommand
{
var provider = new CommandHandlerProvider(this.serviceLocator.BeginLifetimeScope());
var element = CommandBusExcutingHelper.FindCommandExcutingElement(provider, command, communication);
communication["BeginLifetimeScope"] = provider.Scope;
return(element);
}
/// <summary>
/// 找出当前的命令信息
/// </summary>
/// <typeparam name="TCommand">信息类型</typeparam>
/// <param name="provider"></param>
/// <param name="command">信息</param>
/// <param name="communication">上下文通讯</param>
/// <returns></returns>
internal static CommandExcutingElement FindCommandExcutingElement <TCommand>(CommandHandlerProvider provider, TCommand command, HandlerCommunication communication) where TCommand : ICommand
{
/*查找事件监听者*/
var commandListeners = provider.FindCommandHandler <TCommand>();
if (commandListeners == null || commandListeners.Length <= 0)
{
return(new CommandExcutingElement());
}
if (commandListeners.Length >= 2)
{
throw new InvalidException(string.Format("the command {0} has more handler", typeof(TCommand).Name));
}
var helper = new CommandExcutingElement();
/*命令上下文*/
var commandContext = provider.FindCommandContext();
var defaultContext = commandContext as ICommandContextInitable;
if (defaultContext != null)
{
defaultContext.OnInit(communication, command);
}
helper.CommandContext = commandContext;
/*发布命令*/
var handler = commandListeners[0];
var handlerType = handler.GetType();
helper.CommandHandler = commandListeners[0];
helper.CommandHandlerType = handler.GetType();
/*handler所有属性*/
var handlerAttributes = HandlerBehaviorStorager.Default.GetAttributes(handlerType);
var excuteAttributes = HandlerBehaviorStorager.Default.GetAttributes(handlerType, command.GetType());
var handlerFilters = ObjectExtension.GetAttributes <CommandHandlerFilterAttribute>(handlerAttributes) ?? new CommandHandlerFilterAttribute[] { };
var excuteFilters = ObjectExtension.GetAttributes <CommandHandlerFilterAttribute>(excuteAttributes) ?? new CommandHandlerFilterAttribute[] { };
helper.HandlerFilters = handlerFilters;
helper.ExcuteFilters = excuteFilters;
/*全局命令过滤器*/
var authorizeAttributes = ObjectExtension.GetAttributes <CommandHandlerAuthorizeAttribute>(handlerAttributes) ?? new CommandHandlerAuthorizeAttribute[] { };
helper.AuthorizeFilters = authorizeAttributes;
/*日志预留接口*/
var loggerAttribute = ObjectExtension.GetAttribute <LoggerAttribute>(handlerAttributes);
if (loggerAttribute != null)
{
helper.LoggerAttribute = loggerAttribute;
try
{
var loggerBuilder = loggerAttribute.RegisterKey.IsNotNullOrEmpty() ? provider.Scope.Resolve <ILoggerBuilder>(loggerAttribute.RegisterKey) : provider.Scope.ResolveOptional <ILoggerBuilder>();
helper.LoggerBuilder = loggerBuilder ?? LoggerBuilder.Empty;
}
catch
{
}
}
return(helper);
}
