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Make sure that manifests in bundles are only called at install and deployment time, so it doesnt impact shell startup performance

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This commit is contained in:
Tomeu Vizoso 2008-10-17 15:29:35 +02:00
parent a13ca6d664
commit f5d45d6acd
1 changed files with 16 additions and 8 deletions
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24
src/sugar/bundle/activitybundle.py
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@ -21,12 +21,11 @@ from ConfigParser import ConfigParser
import locale
import os
import tempfile
import logging
from sugar.bundle.bundle import Bundle, \
MalformedBundleException, NotInstalledException
import logging
class ActivityBundle(Bundle):
"""A Sugar activity bundle
@ -52,6 +51,7 @@ class ActivityBundle(Bundle):
self._show_launcher = True
self._activity_version = 0
self._installation_time = os.stat(path).st_mtime
self._manifest = None
info_file = self.get_file('activity/activity.info')
if info_file is None:
@ -62,8 +62,15 @@ class ActivityBundle(Bundle):
if linfo_file:
self._parse_linfo(linfo_file)
self.manifest = None # This should be replaced by following function
self.read_manifest()
def _get_manifest(self):
if self._manifest is None:
self._manifest = self._read_manifest()
return self._manifest
manifest = property(_get_manifest, None, None,
"NOTICE: this property is potentially quite slow, so better make sure "
"that it's not called at performance-critical points like shell or "
"activity startup.")
def _raw_manifest(self):
f = self.get_file("MANIFEST")
@ -75,14 +82,15 @@ class ActivityBundle(Bundle):
f.close()
return ret
def read_manifest(self):
"""read_manifest: sets self.manifest to list of lines in MANIFEST,
with invalid lines replaced by empty lines.
def _read_manifest(self):
"""return a list with the lines in MANIFEST, with invalid lines replaced
by empty lines.
Since absolute order carries information on file history, it should
be preserved. For instance, when renaming a file, you should leave
the new name on the same line as the old one.
"""
logging.debug('STARTUP: Reading manifest')
lines = self._raw_manifest()
# Remove trailing newlines, they do not help keep absolute position.
@ -112,7 +120,7 @@ class ActivityBundle(Bundle):
logging.warning("Bundle %s: invalid entry in MANIFEST: %s"
% (self._name,line))
self.manifest = lines
return lines
def get_files(self, manifest = None):
files = [line for line in (manifest or self.manifest) if line]