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# Copyright (C) 2020 Breezy Developers
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""MemoryBranch object.
"""
from __future__ import absolute_import
from . import config as _mod_config, errors, osutils
from .branch import Branch
from .lock import LogicalLockResult, _RelockDebugMixin
from .revision import NULL_REVISION
from .tag import DisabledTags, MemoryTags
class MemoryBranch(Branch, _RelockDebugMixin):
def __init__(self, repository, last_revision_info, tags=None):
self.repository = repository
self._last_revision_info = last_revision_info
self._revision_history_cache = None
if tags is not None:
self.tags = MemoryTags(tags)
else:
self.tags = DisabledTags(self)
self._partial_revision_history_cache = []
self._last_revision_info_cache = None
self._revision_id_to_revno_cache = None
self._partial_revision_id_to_revno_cache = {}
self.base = 'memory://' + osutils.rand_chars(10)
def get_config(self):
return _mod_config.Config()
def lock_read(self):
self.repository.lock_read()
return LogicalLockResult(self.unlock)
def lock_write(self, token=None):
self.repository.lock_write()
return BranchWriteLockResult(self.unlock, None)
def unlock(self):
self.repository.unlock()
def last_revision_info(self):
return self._last_revision_info
def _gen_revision_history(self):
"""Generate the revision history from last revision
"""
last_revno, last_revision = self.last_revision_info()
with self.lock_read():
self._extend_partial_history()
return list(reversed(self._partial_revision_history_cache))
def get_rev_id(self, revno, history=None):
"""Find the revision id of the specified revno."""
with self.lock_read():
if revno == 0:
return NULL_REVISION
last_revno, last_revid = self.last_revision_info()
if revno == last_revno:
return last_revid
if last_revno is None:
self._extend_partial_history()
return self._partial_revision_history_cache[
len(self._partial_revision_history_cache) - revno]
else:
if revno <= 0 or revno > last_revno:
raise errors.NoSuchRevision(self, revno)
distance_from_last = last_revno - revno
if len(self._partial_revision_history_cache) <= \
distance_from_last:
self._extend_partial_history(distance_from_last)
return self._partial_revision_history_cache[distance_from_last]
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