import ramos

ramos.configure(pools={
    'backend_type': [
        'path.to.backend_a',
        'path.to.backend_b',
    ]
})

POOL_OF_RAMOS = {
    'backend_type': [
        'path.to.backend_a',
        'path.to.backend_b',
    ]
}

from ramos.mixins import ThreadSafeCreateMixin


class BackendA(ThreadSafeCreateMixin):
    id = 'backend_a'
    def say(self):
        return 'A'


class BackendB(ThreadSafeCreateMixin):
    id = 'backend_b'
    def say(self):
        return 'B'

from ramos.pool import BackendPool


class BackendTypePool(BackendPool)
    backend_type = 'backend_type'


backends = BackendTypePool.all()

for backend in backends:
    print(backend.say())


# backend_a = BackendTypePool.get('backend_a')
# backend_b = BackendTypePool.get('backend_b')