public ExecutionPipelineContext(ExecutionContext context, ExecutionPipeline pipeline, object parameter) : base(context.Executor, parameter)
{
if(pipeline == null)
throw new ArgumentNullException("pipeline");
_context = context;
_pipeline = pipeline;
}
protected override ExecutionPipelineContext CreatePipelineContext(ExecutionContext context, ExecutionPipeline pipeline, object parameter)
{
var channelContext = context as IChannelContext;
if(channelContext != null)
return new ChannelPipelineContext(context, pipeline, parameter, channelContext.Channel);
return base.CreatePipelineContext(context, pipeline, parameter);
}
public ChannelPipelineContext(ExecutionContext context, ExecutionPipeline pipeline, object data, IChannel channel) : base(context, pipeline, data)
{
_channel = channel;
}
protected virtual ExecutionPipelineContext CreatePipelineContext(ExecutionContext context, ExecutionPipeline pipeline, object parameter)
{
return new ExecutionPipelineContext(context, pipeline, parameter);
}
protected ExecutionResult Execute(ExecutionContext context)
{
if(context == null)
throw new ArgumentNullException("context");
//创建“Executing”事件的调用参数
ExecutingEventArgs executingArgs = new ExecutingEventArgs(context);
//激发“Executing”事件
this.OnExecuting(executingArgs);
if(executingArgs.Cancel)
return new ExecutionResult(context);
//通过选择器获取当前请求对应的管道集
var pipelines = this.SelectPipelines(context, _pipelines);
//如果当前执行的处理管道数为零则退出
if(pipelines == null || pipelines.Count() < 1)
return null;
//调用执行器过滤器的前半截
var stack = ExecutionUtility.InvokeFiltersExecuting(context.Executor.Filters, filter => this.OnFilterExecuting(filter, context));
//执行管道集，并将其执行的最终结果保存到执行器上下文的Result属性中
context.Result = this.InvokePipelines(pipelines, p => this.CreatePipelineContext(context, p, context.Parameter));
//调用执行器过滤器的后半截
ExecutionUtility.InvokeFiltersExecuted(stack, filter => this.OnFilterExecuted(filter, context));
//激发“Executed”事件
this.OnExecuted(new ExecutedEventArgs(context));
return new ExecutionResult(context);
}
