StrategyServiceNoop

class sigtech.framework.services.strategy_service.proxy.StrategyServiceNoop

No-Op Strategy service implements all of StrategyServiceInterface, however, the methods simple return None(s). This is used primarily when strategy service is inactive

cache_strategy(strategies: Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, Sequence[Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument]]]) → Union[str, None, Sequence[Optional[str]]]

Persist strategies into cache.

Parameters

strategies – single or a list of Strategy object(s) to be persisted.

Returns

single or a list of CacheKey generated and used for caching.

get_strategy_by_key(keys: Union[str, Sequence[str]]) → Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue, None, Sequence[Optional[Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue]]]]

Returns a single cached object or list of objects of the given key(s)

Some lite validation is performed, to compare the current environment dates and the environment dates stored in the metadata. Warnings are logged to stdout.

Parameters

keys – Key(s) to retrieve.

Returns

Strategy object(s) (value or a list), object is set to None if not found, or UnknownSerialisedValue

remove_strategy_by_key(keys: Union[str, Sequence[str]]) → Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue, None, Sequence[Optional[Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue]]]]

Removes strategy from the persistence of the given key(s)

Parameters

keys – Key(s) to remove.

Returns

None

get_strategy_by_name(strategy_names: Union[str, Sequence[str]]) → Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue, None, Sequence[Optional[Union[sigtech.framework.strategies.strategy.Strategy, sigtech.framework.internal.strategies.base.StrategyInstrument, sigtech.framework.internal.infra.cache.api.UnknownSerialisedValue]]]]

Return cached strategy(ies), given strategy name(s). Keys are first constructed from the name, together with the current environment, the cache is then queried for the cached object(s)

Parameters

strategy_names – multiple or single Strategy names.

Returns

(single or a list of) cached Strategy object; object is None if not found, or UnknownSerialisedValue

remove_strategy_by_name(strategy_names: Union[str, Sequence[str]]) → None

Removes strategy from the persistence of the given names(s)

Parameters

strategy_names – multiple or single Strategy names.

Returns

None

get_keys_by_prefix(prefix: str) → Sequence[str]

Return a list of keys which starts with the provided prefix :param prefix: prefix to search for :return: list of keys

list_keys(filter_by_environment: bool = True) → Sequence[str]

Return a list of all keys :param filter_by_environment: filter keys to those generated in the same environment :return: list of keys

list_strategies(filter_by_environment: bool = True) → Sequence[str]

Return a list of all strategy names :param filter_by_environment: filter keys to those generated in the same environment :return: list of strategy names