app engine -- structure

1.Frame object
Looper object
Container object
Instruction object
Param object
Param object

Setup Frame
Looper.Start(Frame)
Get Container
Get Instruction
Get Param
Get Param
do_work with them
Generate Container
Gen Instr
Gen param
Gen param
Make Frame
PushFrame
Make Frame 1
Push Frame 1
Looper.Stop

Looper.start(Frame)
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Ideally in do_work function if there is a next layer call and new buffer...its candidate for frame

2.A change
if do_work has to call multiple layer routines within the same context then both the calls should
be encapsulated in the frame and taken out in FIFO

Flexibility
The container object can be of different types ....inherited
similarly I,P,P also

In case of protocol ,Container closely resembles layer in protocol,I layer entry point, P,P buffers

3.If multiple threads are accessing this engine ..then each thread will have a context in which the frame will be stotred and each context will have a looper or one looper for all