class_docstr: Implement a generic protocol to allow Orion to communicate using
  different storage backend
class_docstr_tok: ["Implement","a","generic","protocol","to","allow","Orion","to","communicate","using","different","storage","backend"]
docstr: Select a pending trial and reserve it for the worker
  
  Returns
  -------
  Returns the reserved trial or None if no trials were found
docstr_tok: ["Select","a","pending","trial","and","reserve","it","for","the","worker","Returns","--","--","--","-","Returns","the","reserved","trial","or","None","if","no","trials","were","found"]
code: def reserve_trial(self, experiment: Experiment) -> Trial | None:
      """Select a pending trial and reserve it for the worker
  
      Returns
      -------
      Returns the reserved trial or None if no trials were found
  
      """
      raise NotImplementedError()
  
imports: from __future__ import annotations
  import contextlib
  import copy
  import logging
  import typing
  from datetime import datetime
  from typing import Literal
  import orion.core
  from orion.core.io import resolve_config
  from orion.core.utils import GenericFactory
label_desc: Use image node_id 10 for calling the BaseStorageProtocol obj's underlying member method code with example usage: obj.reserve_trial(experiment) without return types