cvs2svn_lib/changeset_database.py

   1 # (Be in -*- python -*- mode.)
   2 #
   3 # ====================================================================
   4 # Copyright (c) 2006-2008 CollabNet.  All rights reserved.
   5 #
   6 # This software is licensed as described in the file COPYING, which
   7 # you should have received as part of this distribution.  The terms
   8 # are also available at http://subversion.tigris.org/license-1.html.
   9 # If newer versions of this license are posted there, you may use a
  10 # newer version instead, at your option.
  11 #
  12 # This software consists of voluntary contributions made by many
  13 # individuals.  For exact contribution history, see the revision
  14 # history and logs, available at http://cvs2svn.tigris.org/.
  15 # ====================================================================
  16
  17 """This module contains classes to store changesets."""
  18
  19
  20 from cvs2svn_lib.changeset import Changeset
  21 from cvs2svn_lib.changeset import RevisionChangeset
  22 from cvs2svn_lib.changeset import OrderedChangeset
  23 from cvs2svn_lib.changeset import SymbolChangeset
  24 from cvs2svn_lib.changeset import BranchChangeset
  25 from cvs2svn_lib.changeset import TagChangeset
  26 from cvs2svn_lib.record_table import UnsignedIntegerPacker
  27 from cvs2svn_lib.record_table import MmapRecordTable
  28 from cvs2svn_lib.record_table import RecordTable
  29 from cvs2svn_lib.database import IndexedStore
  30 from cvs2svn_lib.serializer import PrimedPickleSerializer
  31
  32
  33 # Should the CVSItemToChangesetTable database files be memory mapped?
  34 # This speeds up the converstion but can cause the computer's virtual
  35 # address space to be exhausted.  This option can be changed
  36 # externally, affecting any CVSItemToChangesetTables opened subsequent
  37 # to the change:
  38 use_mmap_for_cvs_item_to_changeset_table = False
  39
  40
  41 def CVSItemToChangesetTable(filename, mode):
  42   if use_mmap_for_cvs_item_to_changeset_table:
  43     return MmapRecordTable(filename, mode, UnsignedIntegerPacker())
  44   else:
  45     return RecordTable(filename, mode, UnsignedIntegerPacker())
  46
  47
  48 class ChangesetDatabase(IndexedStore):
  49   def __init__(self, filename, index_filename, mode):
  50     primer = (
  51         Changeset,
  52         RevisionChangeset,
  53         OrderedChangeset,
  54         SymbolChangeset,
  55         BranchChangeset,
  56         TagChangeset,
  57         )
  58     IndexedStore.__init__(
  59         self, filename, index_filename, mode, PrimedPickleSerializer(primer))
  60
  61   def store(self, changeset):
  62     self.add(changeset)
  63
  64   def keys(self):
  65     return list(self.iterkeys())
  66
  67   def close(self):
  68     IndexedStore.close(self)
  69
  70