<filename>yadage/backends/__init__.py
from packtivity.backendutils import proxyloader, load_proxy
from yadage.backends.trivialbackend import TrivialProxy


class CachedProxy(object):
    def __init__(self, proxy, cacheid):
        self.proxy = proxy
        self.cacheid = cacheid

    def details(self):
        return {}

    def json(self):
        return {
            "proxyname": "CachedProxy",
            "proxy": self.proxy.json(),
            "cacheid": self.cacheid,
        }

    @classmethod
    def fromJSON(cls, data, deserialization_opts=None):
        deserialization_opts = deserialization_opts or {}
        p = load_proxy(data["proxy"], deserialization_opts, best_effort_backend=False)
        return cls(p, data["cacheid"])


@proxyloader("CachedProxy")
def cache_loader(jsondata, deserialization_opts=None, best_effort_backend=False):
    proxy = CachedProxy.fromJSON(jsondata, deserialization_opts)
    if best_effort_backend:
        raise NotImplementedError("nope")
    return proxy


@proxyloader("TrivialProxy")
def trivial_loader(jsondata, deserialization_opts=None, best_effort_backend=False):
    proxy = TrivialProxy.fromJSON(jsondata)
    if best_effort_backend:
        raise NotImplementedError("nope")
    return proxy

<filename>yadage/backends/__init__.py
from packtivity.backendutils import proxyloader, load_proxy
from yadage.backends.trivialbackend import TrivialProxy


class CachedProxy(object):
    def __init__(self, proxy, cacheid):
        self.proxy = proxy
        self.cacheid = cacheid

    def details(self):
        return {}

    def json(self):
        return {
            "proxyname": "CachedProxy",
            "proxy": self.proxy.json(),
            "cacheid": self.cacheid,
        }

    @classmethod
    def fromJSON(cls, data, deserialization_opts=None):
        deserialization_opts = deserialization_opts or {}
        p = load_proxy(data["proxy"], deserialization_opts, best_effort_backend=False)
        return cls(p, data["cacheid"])


@proxyloader("CachedProxy")
def cache_loader(jsondata, deserialization_opts=None, best_effort_backend=False):
    proxy = CachedProxy.fromJSON(jsondata, deserialization_opts)
    if best_effort_backend:
        raise NotImplementedError("nope")
    return proxy


@proxyloader("TrivialProxy")
def trivial_loader(jsondata, deserialization_opts=None, best_effort_backend=False):
    proxy = TrivialProxy.fromJSON(jsondata)
    if best_effort_backend:
        raise NotImplementedError("nope")
    return proxy
