text: import asyncio
  import uuid
  from typing import (
      Any,
      cast,
      Dict,
      Hashable,
      Iterator,
      List,
      Optional,
      Tuple,
      Type,
      TypeVar,
  )
  
  from .typedefs import Item
  from .ws import ClientWebSocketResponse
  
  
  class DataStore:
      _KEYS = []
      _MAXLEN = 9999
  
      def __init__(self, keys: List[str] = [], data: List[Item] = []) -> None:
          self._data: Dict[uuid.UUID, Item] = {}
          self._index: Dict[int, uuid.UUID] = {}
          self._keys: Tuple[str, ...] = tuple(keys if keys else self._KEYS)
          self._events: Dict[asyncio.Event, List[Item]] = {}
          self._insert(data)
          if hasattr(self, '_init'):
              getattr(self, '_init')()
  
      def __len__(self) -> int:
          return len(self._data)
  
      def __iter__(self) -> Iterator[Item]:
          return iter(self._data.values())
  
      @staticmethod
      def _hash(item: Dict[str, Hashable]) -> int:
          return hash(tuple(item.items()))
  
      def _insert(self, data: List[Item]) -> None:
          if self._keys:
              for item in data:
                  try:
                      keyitem = {k: item[k] for k in self._keys}
                  except KeyError:
                      pass
                  else:
                      keyhash = self._hash(keyitem)
                      if keyhash not in self._index:
                          _id = uuid.uuid4()
                          self._data[_id] = item
                          self._index[keyhash] = _id
                      else:
                          self._data[self._index[keyhash]] = item
              self._sweep_with_key()
          else:
              for item in data:
                  _id = uuid.uuid4()
                  self._data[_id] = item
              self._sweep_without_key()
          # !TODO! This behaviour might be undesirable.
          self._set(data)
  
      def _update(self, data: List[Item]) -> None:
          if self._keys:
              for item in data:
                  try:
                      keyitem = {k: item[k] for k in self._keys}
                  except KeyError:
                      pass
                  else:
                      keyhash = self._hash(keyitem)
                      if keyhash in self._index:
                          self._data[self._index[keyhash]].update(item)
                      else:
                          _id = uuid.uuid4()
                          self._data[_id] = item
                          self._index[keyhash] = _id
              self._sweep_with_key()
          else:
              for item in data:
                  _id = uuid.uuid4()
                  self._data[_id] = item
              self._sweep_without_key()
          # !TODO! This behaviour might be undesirable.
          self._set(data)
  
      def _delete(self, data: List[Item]) -> None:
          if self._keys:
              for item in data:
                  try:
                      keyitem = {k: item[k] for k in self._keys}
                  except KeyError:
                      pass
                  else:
                      keyhash = self._hash(keyitem)
                      if keyhash in self._index:
                          del self._data[self._index[keyhash]]
                          del self._index[keyhash]
          # !TODO! This behaviour might be undesirable.
          self._set(data)
  
      def _clear(self) -> None:
          self._data.clear()
          self._index.clear()
          self._set([])
  
      def _sweep_with_key(self) -> None:
          if len(self._data) > self._MAXLEN:
              over = len(self._data) - self._MAXLEN
              _iter = iter(self._index)
              keys = [next(_iter) for _ in range(over)]
              for k in keys:
                  del self._data[self._index[k]]
                  del self._index[k]
  
      def _sweep_without_key(self) -> None:
          if len(self._data) > self._MAXLEN:
              over = len(self._data) - self._MAXLEN
              _iter = iter(self._data)
              keys = [next(_iter) for _ in range(over)]
              for k in keys:
                  del self._data[k]
  
      def get(self, item: Item) -> Optional[Item]:
          if self._keys:
              try:
                  keyitem = {k: item[k] for k in self._keys}
              except KeyError:
                  pass
              else:
                  keyhash = self._hash(keyitem)
                  if keyhash in self._index:
                      return self._data[self._index[keyhash]]
  
      def _pop(self, item: Item) -> Optional[Item]:
          if self._keys:
              try:
                  keyitem = {k: item[k] for k in self._keys}
              except KeyError:
                  pass
              else:
                  keyhash = self._hash(keyitem)
                  if keyhash in self._index:
                      ret = self._data[self._index[keyhash]]
                      del self._data[self._index[keyhash]]
                      del self._index[keyhash]
                      return ret
  
      def find(self, query: Item = {}) -> List[Item]:
          if query:
              return [
                  item
                  for item in self
                  if all(k in item and query[k] == item[k] for k in query)
              ]
          else:
              return list(self)
  
      def _find_and_delete(self, query: Item = {}) -> List[Item]:
          if query:
              ret = [
                  item
                  for item in self
                  if all(k in item and query[k] == item[k] for k in query)
              ]
              self._delete(ret)
              return ret
          else:
              ret = list(self)
              self._clear()
              return ret
  
      def _set(self, data: List[Item] = None) -> None:
          for event in self._events:
              event.set()
              self._events[event].extend(data)
  
      async def wait(self) -> List[Item]:
          event = asyncio.Event()
          ret = []
          self._events[event] = ret
          await event.wait()
          del self._events[event]
          return ret
  
  
  TDataStore = TypeVar('TDataStore', bound=DataStore)
  
  
  class DataStoreManager:
      def __init__(self) -> None:
          self._stores: Dict[str, DataStore] = {}
          self._events: List[asyncio.Event] = []
          self._iscorofunc = asyncio.iscoroutinefunction(self._onmessage)
          if hasattr(self, '_init'):
              getattr(self, '_init')()
  
      def __getitem__(self, name: str) -> Optional['DataStore']:
          return self._stores[name]
  
      def __contains__(self, name: str) -> bool:
          return name in self._stores
  
      def create(
          self,
          name: str,
          *,
          keys: List[str] = [],
          data: List[Item] = [],
          datastore_class: Type[DataStore] = DataStore,
      ) -> None:
          self._stores[name] = datastore_class(keys, data)
  
      def get(self, name: str, type: Type[TDataStore]) -> TDataStore:
          return cast(type, self._stores.get(name))
  
      def _onmessage(self, msg: Any, ws: ClientWebSocketResponse) -> None:
          print(msg)
  
      def onmessage(self, msg: Any, ws: ClientWebSocketResponse) -> None:
          self._onmessage(msg, ws)
          self._set()
  
      def _set(self) -> None:
          for event in self._events:
              event.set()
          self._events.clear()
  
      async def wait(self) -> None:
          event = asyncio.Event()
          self._events.append(event)
          await event.wait()
  