text: # --------------------------------------------------------------------------
  #
  # Copyright (c) Microsoft Corporation. All rights reserved.
  #
  # The MIT License (MIT)
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the ""Software""), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  # --------------------------------------------------------------------------
  """Common functions shared by both the sync and the async decorators."""
  from contextlib import contextmanager
  import warnings
  
  from ._abstract_span import AbstractSpan
  from ..settings import settings
  
  
  try:
      from typing import TYPE_CHECKING
  except ImportError:
      TYPE_CHECKING = False
  
  if TYPE_CHECKING:
      from typing import Any, Optional, Union, Callable, List, Type, Generator
  
  
  def get_function_and_class_name(func, *args):
      # type: (Callable, List[Any]) -> str
      """
      Given a function and its unamed arguments, returns class_name.function_name. It assumes the first argument
      is `self`. If there are no arguments then it only returns the function name.
  
      :param func: the function passed in
      :type func: callable
      :param args: List of arguments passed into the function
      """
      try:
          return func.__qualname__
      except AttributeError:
          if args:
              return "{}.{}".format(args[0].__class__.__name__, func.__name__)  # pylint: disable=protected-access
          return func.__name__
  
  @contextmanager
  def change_context(span):
      # type: (Optional[AbstractSpan]) -> Generator
      """Execute this block inside the given context and restore it afterwards.
  
      This does not start and ends the span, but just make sure all code is executed within
      that span.
  
      If span is None, no-op.
  
      :param span: A span
      :type span: AbstractSpan
      :rtype: contextmanager
      """
      span_impl_type = settings.tracing_implementation()  # type: Type[AbstractSpan]
      if span_impl_type is None or span is None:
          yield
      else:
          try:
              with span_impl_type.change_context(span):
                  yield
          except AttributeError:
              # This plugin does not support "change_context"
              warnings.warn('Your tracing plugin should be updated to support "change_context"', DeprecationWarning)
              original_span = span_impl_type.get_current_span()
              try:
                  span_impl_type.set_current_span(span)
                  yield
              finally:
                  span_impl_type.set_current_span(original_span)
  
  
  def with_current_context(func):
      # type: (Callable) -> Any
      """Passes the current spans to the new context the function will be run in.
  
      :param func: The function that will be run in the new context
      :return: The func wrapped with correct context
      :rtype: callable
      """
      span_impl_type = settings.tracing_implementation()  # type: Type[AbstractSpan]
      if span_impl_type is None:
          return func
  
      return span_impl_type.with_current_context(func)
  