alpcentaur
/
basabuuka_prototyp


								========

								queuelib

								========


								.. image:: https://secure.travis-ci.org/scrapy/queuelib.png?branch=master

								   :target: http://travis-ci.org/scrapy/queuelib


								.. image:: https://img.shields.io/codecov/c/github/scrapy/queuelib/master.svg

								   :target: http://codecov.io/github/scrapy/queuelib?branch=master

								   :alt: Coverage report


								Queuelib is a collection of persistent (disk-based) queues for Python.


								Queuelib goals are speed and simplicity. It was originally part of the `Scrapy

								framework`_ and stripped out on its own library.


								Note: Queuelib isn't thread-safe.


								Requirements

								============


								* Python 2.7 or Python 3.3

								* no external library requirements


								Installation

								============


								You can install Queuelib either via the Python Package Index (PyPI) or from

								source.


								To install using pip::


								    $ pip install queuelib


								To install using easy_install::


								    $ easy_install queuelib


								If you have downloaded a source tarball you can install it by running the

								following (as root)::


								    # python setup.py install


								FIFO/LIFO disk queues

								=====================


								Queuelib provides FIFO and LIFO queue implementations.


								Here is an example usage of the FIFO queue::


								    >>> from queuelib import FifoDiskQueue

								    >>> q = FifoDiskQueue("queuefile")

								    >>> q.push(b'a')

								    >>> q.push(b'b')

								    >>> q.push(b'c')

								    >>> q.pop()

								    b'a'

								    >>> q.close()

								    >>> q = FifoDiskQueue("queuefile")

								    >>> q.pop()

								    b'b'

								    >>> q.pop()

								    b'c'

								    >>> q.pop()

								    >>>


								The LIFO queue is identical (API-wise), but importing ``LifoDiskQueue``

								instead.


								PriorityQueue

								=============


								A discrete-priority queue implemented by combining multiple FIFO/LIFO queues

								(one per priority).


								First, select the type of queue to be used per priority (FIFO or LIFO)::


								    >>> from queuelib import FifoDiskQueue

								    >>> qfactory = lambda priority: FifoDiskQueue('queue-dir-%s' % priority)


								Then instantiate the Priority Queue with it::


								    >>> from queuelib import PriorityQueue

								    >>> pq = PriorityQueue(qfactory)


								And use it::


								    >>> pq.push(b'a', 3)

								    >>> pq.push(b'b', 1)

								    >>> pq.push(b'c', 2)

								    >>> pq.push(b'd', 2)

								    >>> pq.pop()

								    b'b'

								    >>> pq.pop()

								    b'c'

								    >>> pq.pop()

								    b'd'

								    >>> pq.pop()

								    b'a'


								RoundRobinQueue

								===============


								Has nearly the same interface and implementation as a Priority Queue except

								that each element must be pushed with a (mandatory) key.  Popping from the

								queue cycles through the keys "round robin".


								Instantiate the Round Robin Queue similarly to the Priority Queue::


								    >>> from queuelib import RoundRobinQueue

								    >>> rr = RoundRobinQueue(qfactory)


								And use it::


								    >>> rr.push(b'a', '1')

								    >>> rr.push(b'b', '1')

								    >>> rr.push(b'c', '2')

								    >>> rr.push(b'd', '2')

								    >>> rr.pop()

								    b'a'

								    >>> rr.pop()

								    b'c'

								    >>> rr.pop()

								    b'b'

								    >>> rr.pop()

								    b'd'


								Mailing list

								============


								Use the `scrapy-users`_ mailing list for questions about Queuelib.


								Bug tracker

								===========


								If you have any suggestions, bug reports or annoyances please report them to

								our issue tracker at: http://github.com/scrapy/queuelib/issues/


								Contributing

								============


								Development of Queuelib happens at GitHub: http://github.com/scrapy/queuelib


								You are highly encouraged to participate in the development. If you don't like

								GitHub (for some reason) you're welcome to send regular patches.


								All changes require tests to be merged.


								Tests

								=====


								Tests are located in `queuelib/tests` directory. They can be run using

								`nosetests`_ with the following command::


								    nosetests


								The output should be something like the following::


								    $ nosetests

								    .............................................................................

								    ----------------------------------------------------------------------

								    Ran 77 tests in 0.145s


								    OK


								License

								=======


								This software is licensed under the BSD License. See the LICENSE file in the

								top distribution directory for the full license text.


								Versioning

								==========


								This software follows `Semantic Versioning`_


								.. _Scrapy framework: http://scrapy.org

								.. _scrapy-users: http://groups.google.com/group/scrapy-users

								.. _Semantic Versioning: http://semver.org/

								.. _nosetests: https://nose.readthedocs.org/en/latest/