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How to use _lock_backing_file method in autotest

Best Python code snippet using autotest_python

file_store.py

Source:file_store.py

...38    def __str__(self):39        return '%s[%s]' % (type(self).__name__, self._store_file)40    def _refresh_impl(self):41        """See parent class docstring."""42        with self._lock_backing_file():43            return self._refresh_impl_locked()44    def _commit_impl(self, info):45        """See parent class docstring."""46        with self._lock_backing_file():47            return self._commit_impl_locked(info)48    def _refresh_impl_locked(self):49        """Same as _refresh_impl, but assumes relevant files are locked."""50        try:51            with open(self._store_file, 'r') as fp:52                return host_info.json_deserialize(fp)53        except IOError as e:54            if e.errno == errno.ENOENT:55                raise host_info.StoreError(56                        'No backing file. You must commit to the store before '57                        'trying to read a value from it.')58            raise host_info.StoreError('Failed to read backing file (%s) : %r'59                                       % (self._store_file, e))60        except host_info.DeserializationError as e:61            raise host_info.StoreError(62                    'Failed to desrialize backing file %s: %r' %63                    (self._store_file, e))64    def _commit_impl_locked(self, info):65        """Same as _commit_impl, but assumes relevant files are locked."""66        try:67            with open(self._store_file, 'w') as fp:68                host_info.json_serialize(info, fp)69        except IOError as e:70            raise host_info.StoreError('Failed to write backing file (%s) : %r'71                                       % (self._store_file, e))72    @contextlib.contextmanager73    def _lock_backing_file(self):74        """Context to lock the backing store file.75        @raises StoreError if the backing file can not be locked.76        """77        def _retry_locking_failures(exc):78            return isinstance(exc, locking.LockNotAcquiredError)79        try:80            retry_util.GenericRetry(81                    handler=_retry_locking_failures,82                    functor=self._lock.write_lock,83                    max_retry=self._lock_max_retry,84                    sleep=self._lock_sleep)85        # If self._lock fails to write the locking file, it'll leak an OSError86        except (locking.LockNotAcquiredError, OSError) as e:87            raise host_info.StoreError(e)...

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