/// <summary>
/// 生成异步拦截器，即before、targetFn、after、error会按顺序执行但仅before函数阻塞当前线程，后续函数均在另一个线程中执行。
/// </summary>
/// <param name="targetFn">原函数</param>
/// <param name="before">前置拦截器</param>
/// <param name="after">后置拦截器</param>
/// <param name="error">异常处理</param>
/// <param name="must">无论before、targeFn、after和error函数执行结果如何都必须执行的函数</param>
/// <returns>加工后带拦截器的函数</returns>
public static FnWithInterceptor CreateAsyncInterceptor(TargetFn targetFn, Before before = null, After after = null, Error error = null, Must must = null)
{
return(() =>
{
PipingItemReturnValue returnValue = new PipingItemReturnValue();
if (null != before)
{
returnValue = before();
}
if (null != targetFn)
{
ThreadPool.QueueUserWorkItem((state) =>
{
try
{
returnValue = targetFn(returnValue);
if (null != after)
{
after(returnValue);
}
}
catch (Exception ex)
{
if (null != error)
{
returnValue.Ex = ex;
error(returnValue);
}
}
finally
{
if (null != must)
{
must(returnValue);
}
}
});
}
else if (null != must)
{
must(returnValue);
}
});
}
/// <summary>
/// 管道流，当管道流中的其中一个模块返回false时则跳出管道并执行回调函数
/// </summary>
/// <param name="pipingItems">管道</param>
/// <param name="state">管道流域参数</param>
/// <param name="pipingCallback">跳出管道时的回调函数</param>
public static void Piping(PipingItem[] pipingItems, IDictionary <string, object> state = null, PipingCallback pipingCallback = null, Interrupter interrupter = null)
{
PipingItemReturnValue curPipingItemReturnValue = null;
if (state == null)
{
state = new Dictionary <string, object>();
}
if (interrupter != null)
{
state["Interrupt"] = interrupter.Interrupt;
}
for (int i = 0, len = pipingItems.Length; i < len && (curPipingItemReturnValue == null || curPipingItemReturnValue.IsSuccess); i++)
{
curPipingItemReturnValue = pipingItems[i](state, (curPipingItemReturnValue == null ? null : curPipingItemReturnValue.Objs));
}
if (pipingCallback == null)
{
return;
}
pipingCallback(curPipingItemReturnValue);
}