165
159
"""Extension point for subclasses to check during serialisation.
167
161
:param inv: An inventory about to be serialised, to be checked.
168
:raises: AssertionError if an error has occurred.
170
if inv.revision_id is None:
171
raise AssertionError("inv.revision_id is None")
172
if inv.root.revision is None:
173
raise AssertionError("inv.root.revision is None")
175
def _check_cache_size(self, inv_size, entry_cache):
176
"""Check that the entry_cache is large enough.
178
We want the cache to be ~2x the size of an inventory. The reason is
179
because we use a FIFO cache, and how Inventory records are likely to
180
change. In general, you have a small number of records which change
181
often, and a lot of records which do not change at all. So when the
182
cache gets full, you actually flush out a lot of the records you are
183
interested in, which means you need to recreate all of those records.
184
An LRU Cache would be better, but the overhead negates the cache
187
One way to look at it, only the size of the cache > len(inv) is your
188
'working' set. And in general, it shouldn't be a problem to hold 2
189
inventories in memory anyway.
191
:param inv_size: The number of entries in an inventory.
193
if entry_cache is None:
195
# 1.5 times might also be reasonable.
196
recommended_min_cache_size = inv_size * 1.5
197
if entry_cache.cache_size() < recommended_min_cache_size:
198
recommended_cache_size = inv_size * 2
199
trace.mutter('Resizing the inventory entry cache from %d to %d',
200
entry_cache.cache_size(), recommended_cache_size)
201
entry_cache.resize(recommended_cache_size)
162
:raises: AssertionError if an error has occured.
164
assert inv.revision_id is not None
165
assert inv.root.revision is not None
203
167
def write_inventory_to_lines(self, inv):
204
168
"""Return a list of lines with the encoded inventory."""
365
330
def _pack_revision_properties(self, rev, under_element):
366
331
top_elt = SubElement(under_element, 'properties')
367
332
for prop_name, prop_value in sorted(rev.properties.items()):
333
assert isinstance(prop_name, basestring)
334
assert isinstance(prop_value, basestring)
368
335
prop_elt = SubElement(top_elt, 'property')
369
336
prop_elt.set('name', prop_name)
370
337
prop_elt.text = prop_value
371
338
prop_elt.tail = '\n'
372
339
top_elt.tail = '\n'
374
def _unpack_inventory(self, elt, revision_id=None, entry_cache=None,
375
return_from_cache=False):
341
def _unpack_inventory(self, elt, revision_id=None):
376
342
"""Construct from XML Element"""
377
343
if elt.tag != 'inventory':
378
344
raise errors.UnexpectedInventoryFormat('Root tag is %r' % elt.tag)
385
351
revision_id = cache_utf8.encode(revision_id)
386
352
inv = inventory.Inventory(root_id=None, revision_id=revision_id)
388
ie = self._unpack_entry(e, entry_cache=entry_cache,
389
return_from_cache=return_from_cache)
354
ie = self._unpack_entry(e)
391
self._check_cache_size(len(inv), entry_cache)
356
assert inv.root.revision is not None
394
def _unpack_entry(self, elt, entry_cache=None, return_from_cache=False):
396
file_id = elt_get('file_id')
397
revision = elt_get('revision')
398
# Check and see if we have already unpacked this exact entry
399
# Some timings for "repo.revision_trees(last_100_revs)"
401
# unmodified 4.1s 40.8s
403
# using fifo 2.83s 29.1s
407
# no_copy 2.00s 20.5s
408
# no_c,dict 1.95s 18.0s
409
# Note that a cache of 10k nodes is more than sufficient to hold all of
410
# the inventory for the last 100 revs for bzr, but not for mysql (20k
411
# is enough for mysql, which saves the same 2s as using a dict)
413
# Breakdown of mysql using time.clock()
414
# 4.1s 2 calls to element.get for file_id, revision_id
415
# 4.5s cache_hit lookup
416
# 7.1s InventoryFile.copy()
417
# 2.4s InventoryDirectory.copy()
418
# 0.4s decoding unique entries
419
# 1.6s decoding entries after FIFO fills up
420
# 0.8s Adding nodes to FIFO (including flushes)
421
# 0.1s cache miss lookups
423
# 4.1s 2 calls to element.get for file_id, revision_id
424
# 9.9s cache_hit lookup
425
# 10.8s InventoryEntry.copy()
426
# 0.3s cache miss lookus
427
# 1.2s decoding entries
428
# 1.0s adding nodes to LRU
429
if entry_cache is not None and revision is not None:
430
key = (file_id, revision)
432
# We copy it, because some operations may mutate it
433
cached_ie = entry_cache[key]
437
# Only copying directory entries drops us 2.85s => 2.35s
438
if return_from_cache:
439
if cached_ie.kind == 'directory':
440
return cached_ie.copy()
442
return cached_ie.copy()
359
def _unpack_entry(self, elt):
445
361
if not InventoryEntry.versionable_kind(kind):
446
362
raise AssertionError('unsupported entry kind %s' % kind)
448
364
get_cached = _get_utf8_or_ascii
450
file_id = get_cached(file_id)
451
if revision is not None:
452
revision = get_cached(revision)
453
parent_id = elt_get('parent_id')
366
parent_id = elt.get('parent_id')
454
367
if parent_id is not None:
455
368
parent_id = get_cached(parent_id)
369
file_id = get_cached(elt.get('file_id'))
457
371
if kind == 'directory':
458
372
ie = inventory.InventoryDirectory(file_id,
461
375
elif kind == 'file':
462
376
ie = inventory.InventoryFile(file_id,
465
ie.text_sha1 = elt_get('text_sha1')
466
if elt_get('executable') == 'yes':
379
ie.text_sha1 = elt.get('text_sha1')
380
if elt.get('executable') == 'yes':
467
381
ie.executable = True
468
v = elt_get('text_size')
382
v = elt.get('text_size')
469
383
ie.text_size = v and int(v)
470
384
elif kind == 'symlink':
471
385
ie = inventory.InventoryLink(file_id,
474
ie.symlink_target = elt_get('symlink_target')
388
ie.symlink_target = elt.get('symlink_target')
476
390
raise errors.UnsupportedInventoryKind(kind)
391
revision = elt.get('revision')
392
if revision is not None:
393
revision = get_cached(revision)
477
394
ie.revision = revision
478
if revision is not None and entry_cache is not None:
479
# We cache a copy() because callers like to mutate objects, and
480
# that would cause the item in cache to mutate as well.
481
# This has a small effect on many-inventory performance, because
482
# the majority fraction is spent in cache hits, not misses.
483
entry_cache[key] = ie.copy()
487
398
def _unpack_revision(self, elt):
488
399
"""XML Element -> Revision object"""
400
assert elt.tag == 'revision'
489
401
format = elt.get('format')
490
402
format_num = self.format_num
491
403
if self.revision_format_num is not None:
515
429
def _unpack_revision_properties(self, elt, rev):
516
430
"""Unpack properties onto a revision."""
517
431
props_elt = elt.find('properties')
432
assert len(rev.properties) == 0
518
433
if not props_elt:
520
435
for prop_elt in props_elt:
521
if prop_elt.tag != 'property':
522
raise AssertionError(
523
"bad tag under properties list: %r" % prop_elt.tag)
436
assert prop_elt.tag == 'property', \
437
"bad tag under properties list: %r" % prop_elt.tag
524
438
name = prop_elt.get('name')
525
439
value = prop_elt.text
526
440
# If a property had an empty value ('') cElementTree reads