Python port of CoalescingRingBuffer from LMAXCollections
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README.rst

coalringbuf

Build status

coalringbuf is Python port of CoalescingRingBuffer from LMAXCollections. coalringbuf works with:

  • CPython 2.x >= 2.5, 3.x >= 3.2
  • PyPy 1.9+

Supported platforms: platform independent.

Status

It's usable and it passes port of original test suite. It's currently based on LMAXCollections 1.1.0.

Usage

This port mimics original CoalescingRingBuffer API as closely as possible, however it was modified to make it more Pythonic.

Example intepreter session:

>>> from coalringbuf import CoalescingRingBuffer
>>> buffer = CoalescingRingBuffer(3)
>>> buffer.capacity
4
>>> buffer.empty
True
>>> buffer.offer('something')
True
>>> buffer.empty
False
>>> buffer.offer('something else')
True
>>> buffer.offer('quack')
True
>>> buffer.offer('id', 'value')
True
>>> buffer.size
4
>>> buffer.full
True
>>> buffer.offer('id', 'this will overwrite "value"')
True
>>> buffer.size
4
>>> buffer.offer('this will be rejected')
False
>>> buffer.size
4
>>> bucket = []
>>> buffer.poll(bucket)
4
>>> bucket
['something', 'something else', 'quack', 'this will overwrite "value"']
>>> buffer.empty
True

TODO

  • implement performance tests
  • provide more efficient bucket class if needed

Copyright

Original implementation (C) LMAX/Nick Zeeb.

Python implementation (C) 2013 Jakub Stasiak.

This project is licensed under MIT license, see LICENSE file for details.