upstream/mercurial-mirror Files · mercurial/interfaces/util.py

transaction: change list of journal entries into a dictionary...

transaction: change list of journal entries into a dictionary The transaction object used to keep a mapping table of path names to journal entries and a list of journal entries consisting of path and file offset to truncate on rollback. The offsets are used in three cases. repair.strip and rollback process all of them in one go, but they care about the order. For them, it is perfectly reasonable to read the journal back from disk as both operations already involve at least one system call per journal entry. The other consumer is the revlog logic for moving from inline to external data storage. It doesn't care about the order of the journal and just needs to original offset stored. Further optimisations are possible here to move the in-memory journal to a set(), but without memoisation of the original revlog size this could turn it into O(n^2) behavior in worst case when many revlogs need to migrated. Differential Revision: https://phab.mercurial-scm.org/D9277

Augie Fackler - - Load All Authors

File last commit:

r43347:687b865b default


                r46475:5b1214c1

default

Download file

             util.py
        
                    38 lines
            
             | 1.0 KiB
            
                | text/x-python
            
             |
                PythonLexer
            
             / mercurial / interfaces / util.py
          
                    History
                
                 |
                  Annotation
                 | Raw
                 |Copy content
                 |Copy permalink

      # util.py - Utilities for declaring interfaces.

      #

      # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      # zope.interface imposes a run-time cost due to module import overhead and

      # bookkeeping for declaring interfaces. So, we use stubs for various

      # zope.interface primitives unless instructed otherwise.

      from __future__ import absolute_import

      from .. import encoding

      if encoding.environ.get(b'HGREALINTERFACES'):

          from ..thirdparty.zope import interface as zi

          Attribute = zi.Attribute

          Interface = zi.Interface

          implementer = zi.implementer

      else:

          class Attribute(object):

              def __init__(self, __name__, __doc__=b''):

                  pass

          class Interface(object):

              def __init__(

                  self, name, bases=(), attrs=None, __doc__=None, __module__=None

              ):

                  pass

          def implementer(*ifaces):

              def wrapper(cls):

                  return cls

              return wrapper

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				# util.py - Utilities for declaring interfaces.
				#
				# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				# zope.interface imposes a run-time cost due to module import overhead and
				# bookkeeping for declaring interfaces. So, we use stubs for various
				# zope.interface primitives unless instructed otherwise.

				from __future__ import absolute_import

				from .. import encoding

				if encoding.environ.get(b'HGREALINTERFACES'):
				from ..thirdparty.zope import interface as zi

				Attribute = zi.Attribute
				Interface = zi.Interface
				implementer = zi.implementer
				else:

				class Attribute(object):
				def __init__(self, __name__, __doc__=b''):
				pass

				class Interface(object):
				def __init__(
				self, name, bases=(), attrs=None, __doc__=None, __module__=None
				):
				pass

				def implementer(*ifaces):
				def wrapper(cls):
				return cls

				return wrapper