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import logging
from typing import List
from ..engines._DatabaseEngine import _DatabaseEngine
from .context.Context import Context
LOGGER = logging.getLogger(__name__)
class Database:
def __init__(self, database_engine : _DatabaseEngine):
if not isinstance(database_engine, _DatabaseEngine):
raise Exception('database_engine must inherit from _DatabaseEngine')
self._database_engine = database_engine
self._acquired = False
self._owner_key = None
def __enter__(self) -> '_DatabaseEngine':
self._acquired, self._owner_key = self._database_engine.lock()
if not self._acquired: raise Exception('Unable to acquire database lock')
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self._database_engine.unlock(self._owner_key)
def clear_all(self, keep_keys=set()):
LOGGER.info('Cleaning up...')
keys = self._database_engine.keys()
LOGGER.info(' keys before = {}'.format(str(keys)))
for key in keys:
if(key in keep_keys): continue
self._database_engine.delete(key)
LOGGER.info(' keys after = {}'.format(str(self._database_engine.keys())))
def dump(self) -> List[str]:
entries = self._database_engine.dump()
entries.sort()
return ['[{:>4s}] {:100s} :: {}'.format(k_type, k_name, k_value) for k_name,k_type,k_value in entries]
def context(self, context_uuid : str) -> Context: return Context(context_uuid, self._database_engine)