private async Task <BaseObject> OnAfterDelivery(ActivityDeliveryContext ctx)
{
ctx.IsReading = false;
ctx.IsWriting = true;
ctx.HasWritten = true;
return(await GetPipe().Pipe(ctx));
}
public async Task <BaseObject> Pipe(ActivityDeliveryContext ctx)
{
if (ctx.IsReading || (ctx.IsWriting && !ctx.HasWritten))
{
foreach (var handler in this)
{
var objTask = handler.Pipe(ctx);
var obj = await(objTask ?? throw new Exception($"{handler.GetType().FullName}.Pipe() returned null task"));
if (ctx.item == null)
{
return(null);
}
else if (obj != null)
{
return(obj);
}
}
}
else
{
for (int i = this.Count - 1; i >= 0; i--)
{
var obj = await this[i].Pipe(ctx);
if (ctx.item == null)
{
return(null);
}
else if (obj != null)
{
return(obj);
}
}
}
return(null);
}
public override async Task <BaseObject> Set(ActivityObject item, ActivityStreamFilter filter)
{
var box = GetBox(filter);
var ctx = new ActivityDeliveryContext {
context = this, box = box, item = item, Filter = filter
};
var ret = await OnBeforeDelivery(ctx);
if (ret == null)
{
ret = await box.Write(item);
if (ret == null)
{
throw new Exception("Box returned null");
}
else if (ret is Error err)
{
return(ret);
}
else if (ret is ActivityObject activity)
{
ctx.item = activity;
ret = await OnAfterDelivery(ctx);
}
else
{
throw new ArgumentException($"Box returned invalid type {ret.type ?? ret.GetType().FullName}");
}
}
return(ret);
}