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Bases: ABC

Base file limit interface.

Limits used by several onETL components, including :ref:file-downloader and :ref:file-mover, to determine if internal loop should be stopped.

Unlike file filters, limits have internal state which can be updated or reset.

.. versionadded:: 0.8.0

Source code in onetl/base/base_file_limit.py 
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class BaseFileLimit(ABC):
    """
    Base file limit interface.

    Limits used by several onETL components, including :ref:`file-downloader` and :ref:`file-mover`,
    to determine if internal loop should be stopped.

    Unlike file filters, limits have internal state which can be updated or reset.

    .. versionadded:: 0.8.0
    """

    @abstractmethod
    def reset(self) -> Self:
        """
        Resets the internal limit state.

        .. versionadded:: 0.8.0

        Returns
        -------
        Returns a filter of the same type, but with non-reached state.

        It could be the same filter or a new one, this is an implementation detail.

        Examples
        --------

        >>> limit.is_reached
        True
        >>> new_limit = limit.reset()
        >>> new_limit.is_reached
        False
        """

    @abstractmethod
    def stops_at(self, path: PathProtocol) -> bool:
        """
        Update internal state and return current state.

        .. versionadded:: 0.8.0

        Parameters
        ----------
        path : :obj:`onetl.base.path_protocol.PathProtocol`
            Path to check

        Returns
        -------
        ``True`` if limit is reached, ``False`` otherwise.

        Examples
        --------

        >>> from onetl.impl import LocalPath
        >>> # limit is not reached yet
        >>> limit.stops_at(LocalPath("/path/to/file.csv"))
        False
        >>> # after limit is reached
        >>> limit.stops_at(LocalPath("/path/to/another.csv"))
        True
        >>> # at this point, .stops_at() and .is_reached will always return True,
        >>> # even on inputs that returned False before.
        >>> # it will be in the same state until .reset() is called
        >>> limit.stops_at(LocalPath("/path/to/file.csv"))
        True
        """

    @property
    @abstractmethod
    def is_reached(self) -> bool:
        """
        Check if limit is reached.

        .. versionadded:: 0.8.0

        Returns
        -------
        ``True`` if limit is reached, ``False`` otherwise.

        Examples
        --------

        >>> from onetl.impl import LocalPath
        >>> limit.is_reached
        False
        >>> limit.stops_at(LocalPath("/path/to/file.csv"))
        False
        >>> limit.is_reached
        False
        >>> # after limit is reached
        >>> limit.stops_at(LocalPath("/path/to/file.csv"))
        True
        >>> limit.is_reached
        True
        """

is_reached abstractmethod property

Check if limit is reached.

.. versionadded:: 0.8.0

Returns

True if limit is reached, False otherwise.

Examples

from onetl.impl import LocalPath limit.is_reached False limit.stops_at(LocalPath("/path/to/file.csv")) False limit.is_reached False

after limit is reached

limit.stops_at(LocalPath("/path/to/file.csv")) True limit.is_reached True

reset() abstractmethod

Resets the internal limit state.

.. versionadded:: 0.8.0

Returns

Returns a filter of the same type, but with non-reached state.

It could be the same filter or a new one, this is an implementation detail.

Examples

limit.is_reached True new_limit = limit.reset() new_limit.is_reached False

Source code in onetl/base/base_file_limit.py 
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@abstractmethod
def reset(self) -> Self:
    """
    Resets the internal limit state.

    .. versionadded:: 0.8.0

    Returns
    -------
    Returns a filter of the same type, but with non-reached state.

    It could be the same filter or a new one, this is an implementation detail.

    Examples
    --------

    >>> limit.is_reached
    True
    >>> new_limit = limit.reset()
    >>> new_limit.is_reached
    False
    """

stops_at(path) abstractmethod

Update internal state and return current state.

.. versionadded:: 0.8.0

Parameters

path : :obj:onetl.base.path_protocol.PathProtocol Path to check

Returns

True if limit is reached, False otherwise.

Examples

from onetl.impl import LocalPath

limit is not reached yet

limit.stops_at(LocalPath("/path/to/file.csv")) False

after limit is reached

limit.stops_at(LocalPath("/path/to/another.csv")) True

at this point, .stops_at() and .is_reached will always return True,

even on inputs that returned False before.

it will be in the same state until .reset() is called

limit.stops_at(LocalPath("/path/to/file.csv")) True

Source code in onetl/base/base_file_limit.py 
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@abstractmethod
def stops_at(self, path: PathProtocol) -> bool:
    """
    Update internal state and return current state.

    .. versionadded:: 0.8.0

    Parameters
    ----------
    path : :obj:`onetl.base.path_protocol.PathProtocol`
        Path to check

    Returns
    -------
    ``True`` if limit is reached, ``False`` otherwise.

    Examples
    --------

    >>> from onetl.impl import LocalPath
    >>> # limit is not reached yet
    >>> limit.stops_at(LocalPath("/path/to/file.csv"))
    False
    >>> # after limit is reached
    >>> limit.stops_at(LocalPath("/path/to/another.csv"))
    True
    >>> # at this point, .stops_at() and .is_reached will always return True,
    >>> # even on inputs that returned False before.
    >>> # it will be in the same state until .reset() is called
    >>> limit.stops_at(LocalPath("/path/to/file.csv"))
    True
    """