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# Copyright (C) 2009 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""A manager of caches."""
from bzrlib import lru_cache
class CacheManager(object):
def __init__(self, info, verbose=False, inventory_cache_size=10):
"""Create a manager of caches.
:param info: a ConfigObj holding the output from
the --info processor, or None if no hints are available
"""
self.verbose = verbose
# dataref -> data. datref is either :mark or the sha-1.
# Sticky blobs aren't removed after being referenced.
self._blobs = {}
self._sticky_blobs = {}
# revision-id -> Inventory cache
# these are large and we probably don't need too many as
# most parents are recent in history
self.inventories = lru_cache.LRUCache(inventory_cache_size)
# import commmit-ids -> revision-id lookup table
# we need to keep all of these but they are small
self.revision_ids = {}
# path -> file-ids - as generated
self.file_ids = {}
# Head tracking: last ref, last id per ref & map of commit ids to ref*s*
self.last_ref = None
self.last_ids = {}
self.heads = {}
# Work out the blobs to make sticky - None means all
self._blobs_to_keep = None
if info is not None:
try:
self._blobs_to_keep = info['Blob usage tracking']['multi']
except KeyError:
# info not in file - possible when no blobs used
pass
def store_blob(self, id, data):
"""Store a blob of data."""
if (self._blobs_to_keep is None or data == '' or
id in self._blobs_to_keep):
self._sticky_blobs[id] = data
else:
self._blobs[id] = data
def fetch_blob(self, id):
"""Fetch a blob of data."""
try:
return self._sticky_blobs[id]
except KeyError:
return self._blobs.pop(id)
def delete_path(self, path):
"""Remove a path from caches."""
# we actually want to remember what file-id we gave a path,
# even when that file is deleted, so doing nothing is correct
pass
def rename_path(self, old_path, new_path):
"""Rename a path in the caches."""
# In this case, we need to forget the file-id we gave a path,
# otherwise, we'll get duplicate file-ids in the repository.
self.file_ids[new_path] = self.file_ids[old_path]
del self.file_ids[old_path]
def track_heads_for_ref(self, cmd_ref, cmd_id, parents=None):
if parents is not None:
for parent in parents:
refs = self.heads.get(parent)
if refs:
refs.discard(cmd_ref)
if not refs:
del self.heads[parent]
self.heads.setdefault(cmd_id, set()).add(cmd_ref)
self.last_ids[cmd_ref] = cmd_id
self.last_ref = cmd_ref
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