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How to use _unlock_backing_file method in autotest

Best Python code snippet using autotest_python

base_job.py

Source:base_job.py

...115        try:116            return method(self, *args, **dargs)117        finally:118            if not already_have_lock:119                self._unlock_backing_file()120    wrapped_method.__name__ = method.__name__121    wrapped_method.__doc__ = method.__doc__122    return wrapped_method123# decorator for use with job_state methods124def with_backing_file(method):125    """A decorator to perform a lock-read-*-write-unlock cycle.126    When applied to a method, this decorator will automatically wrap127    calls to the method in a lock-and-read before the call followed by a128    write-and-unlock. Any operation that is reading or writing state129    should be decorated with this method to ensure that backing file130    state is consistently maintained.131    """132    @with_backing_lock133    def wrapped_method(self, *args, **dargs):134        self._read_from_backing_file()135        try:136            return method(self, *args, **dargs)137        finally:138            self._write_to_backing_file()139    wrapped_method.__name__ = method.__name__140    wrapped_method.__doc__ = method.__doc__141    return wrapped_method142class job_state(object):143    """A class for managing explicit job and user state, optionally persistent.144    The class allows you to save state by name (like a dictionary). Any state145    stored in this class should be picklable and deep copyable. While this is146    not enforced it is recommended that only valid python identifiers be used147    as names. Additionally, the namespace 'stateful_property' is used for148    storing the valued associated with properties constructed using the149    property_factory method.150    """151    NO_DEFAULT = object()152    PICKLE_PROTOCOL = 2  # highest protocol available in python 2.4153    def __init__(self):154        """Initialize the job state."""155        self._state = {}156        self._backing_file = None157        self._backing_file_initialized = False158        self._backing_file_lock = None159    def _lock_backing_file(self):160        """Acquire a lock on the backing file."""161        if self._backing_file:162            self._backing_file_lock = open(self._backing_file, 'a')163            fcntl.flock(self._backing_file_lock, fcntl.LOCK_EX)164    def _unlock_backing_file(self):165        """Release a lock on the backing file."""166        if self._backing_file_lock:167            fcntl.flock(self._backing_file_lock, fcntl.LOCK_UN)168            self._backing_file_lock.close()169            self._backing_file_lock = None170    def read_from_file(self, file_path, merge=True):171        """Read in any state from the file at file_path.172        When merge=True, any state specified only in-memory will be preserved.173        Any state specified on-disk will be set in-memory, even if an in-memory174        setting already exists.175        @param file_path: The path where the state should be read from. It must176            exist but it can be empty.177        @param merge: If true, merge the on-disk state with the in-memory178            state. If false, replace the in-memory state with the on-disk...

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