Conditional inheritance

[nikitinvv]

@MarkRivers @decarlof I see huge code duplication with the current inheritance scheme. For instance, we have 3 classes tomoscan2bm, tomoscan2bm_step, and tomoscan2b_stream inherited from tomoscan_pso, tomoscan_step, and tomoscan_stream, respectively. However, functionality of these inherited classes is very similar (or even just 100% copy). I suggest to employ dynamic conditional inheritance implemented like this:

class TomoscanPSO():
    def __init__(self):
        print(f'inheritance from class Pso')


class TomoscanSTEP():
    def __init__(self):
        print(f'inheritance from class Step')


class TomoscanStream():
    def __init__(self):
        print(f'inheritance from class Stream')

mdict = {'STEP': TomoscanSTEP,
         'PSO': TomoscanPSO,
         'STREAM': TomoscanStream
         }

def makeclass(type):
    class Tomoscan2BM(mdict[type]):
            def __init__(self):
                super().__init__()
                print(f'class 2BM')
    return Tomoscan2BM()


a = makeclass('STEP')

In this case, there will be only one class Tomoscan2BM instead of 3, variable 'type' can be taken from the command line.

[decarlof]

@nikitinvv this is a good idea and will eliminate python code duplication but we need also to propagate the conditional inheritance to the IOC/medm screens. Now for example when we run the fly, step or stream we have customized IOC Pvs and associated medm screens.