Subsystem

Construction of SubSystems

A SubSystem consists of connected components. Thus, to construct a SubSystem, we first construct components, connect them and specify the input and output of SubSystem. See the basic constructor.

SubSystem(components, input, output)

Basic Operation of SubSystems

The operation of a SubSystem is very similar to that of a StaticSystem. The only difference is that when a SubSystem is triggered from its trigger link, it distributes the trigger to the trigger links of its components. Then, each of the components of the SubSystem takes steps individually.

Let us construct a subsystem consisting of a generator and an adder.

julia> using Jusdl # hide

julia> gen = ConstantGenerator()
ConstantGenerator(amp:1.0)

julia> adder = Adder(Bus(2))
Adder(signs:(+, +), input:Bus(nlinks:2, eltype:Link{Float64}, isreadable:false, iswritable:false), output:Bus(nlinks:1, eltype:Link{Float64}, isreadable:false, iswritable:false))

Connect the generator and adder.

julia> connect(gen.output, adder.input[1])

We are ready to construct a SubSystem.

julia> sub = SubSystem([gen, adder], [adder.input[2]], adder.output)
SubSystem{Bus{Link{Float64}},Bus{Link{Float64}},Link{Float64},Link{Bool},Array{AbstractComponent,1}}(Bus(nlinks:1, eltype:Link{Float64}, isreadable:false, iswritable:false), Bus(nlinks:1, eltype:Link{Float64}, isreadable:false, iswritable:false), Link(state:open, eltype:Float64, hasmaster:false, numslaves:0, isreadable:false, iswritable:false), Link(state:open, eltype:Bool, hasmaster:false, numslaves:0, isreadable:false, iswritable:false), Callback[], UUID("ef7bf30f-14a5-4753-b7a8-3b8840677646"), AbstractComponent[ConstantGenerator(amp:1.0), Adder(signs:(+, +), input:Bus(nlinks:2, eltype:Link{Float64}, isreadable:false, iswritable:false), output:Bus(nlinks:1, eltype:Link{Float64}, isreadable:false, iswritable:false))])

To trigger the sub, we need to launch it,

julia> t = launch(sub)
2-element Array{Tuple{Task,Task},1}:
 (Task (runnable) @0x00007fd8ce82a230, Task (runnable) @0x00007fd8ce829870)
 (Task (runnable) @0x00007fd8cedb9fc0, Task (runnable) @0x00007fd8cedb9d50)

sub is ready to be triggered,

julia> drive(sub, 1.)

Put some data to the input of sub.

julia> put!(sub.input, [1.])
1-element Array{Float64,1}:
 1.0

The step needs to be approved.

julia> approve(sub)
true

Now print the data written to the outputs of the components of sub.

julia> sub.components[1].output[1].buffer.data[1]
1.0

julia> sub.components[2].output[1].buffer.data[1]
2.0

Note that when sub is triggered, sub transfer the trigger to all its internal components.