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+# -*- coding: utf-8 -*-
+
+# daemon/pidfile.py
+# Part of ‘python-daemon’, an implementation of PEP 3143.
+#
+# Copyright © 2008–2015 Ben Finney <ben+python@benfinney.id.au>
+#
+# This is free software: you may copy, modify, and/or distribute this work
+# under the terms of the Apache License, version 2.0 as published by the
+# Apache Software Foundation.
+# No warranty expressed or implied. See the file ‘LICENSE.ASF-2’ for details.
+
+""" Lockfile behaviour implemented via Unix PID files.
+ """
+
+from __future__ import (absolute_import, unicode_literals)
+
+from lockfile.pidlockfile import PIDLockFile
+
+
+class TimeoutPIDLockFile(PIDLockFile, object):
+ """ Lockfile with default timeout, implemented as a Unix PID file.
+
+ This uses the ``PIDLockFile`` implementation, with the
+ following changes:
+
+ * The `acquire_timeout` parameter to the initialiser will be
+ used as the default `timeout` parameter for the `acquire`
+ method.
+
+ """
+
+ def __init__(self, path, acquire_timeout=None, *args, **kwargs):
+ """ Set up the parameters of a TimeoutPIDLockFile.
+
+ :param path: Filesystem path to the PID file.
+ :param acquire_timeout: Value to use by default for the
+ `acquire` call.
+ :return: ``None``.
+
+ """
+ self.acquire_timeout = acquire_timeout
+ super(TimeoutPIDLockFile, self).__init__(path, *args, **kwargs)
+
+ def acquire(self, timeout=None, *args, **kwargs):
+ """ Acquire the lock.
+
+ :param timeout: Specifies the timeout; see below for valid
+ values.
+ :return: ``None``.
+
+ The `timeout` defaults to the value set during
+ initialisation with the `acquire_timeout` parameter. It is
+ passed to `PIDLockFile.acquire`; see that method for
+ details.
+
+ """
+ if timeout is None:
+ timeout = self.acquire_timeout
+ super(TimeoutPIDLockFile, self).acquire(timeout, *args, **kwargs)
+
+
+# Local variables:
+# coding: utf-8
+# mode: python
+# End:
+# vim: fileencoding=utf-8 filetype=python :