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Use the mmapped fileobj in more places and use slice access

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This commit is contained in:
René Stadler 2007-12-03 15:45:09 +02:00 committed by Stefan Sauer
parent 4424eb686f
commit c28059e36c
2 changed files with 15 additions and 17 deletions
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9
debug-viewer/GstDebugViewer/Data.py
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@ -171,9 +171,7 @@ class LineCache (Producer):
self.logger = logging.getLogger ("linecache")
self.dispatcher = dispatcher
import mmap
self.__fileobj = mmap.mmap (fileobj.fileno (), 0, prot = mmap.PROT_READ)
self.__fileobj = fileobj
self.__fileobj.seek (0, 2)
self.__file_size = self.__fileobj.tell ()
self.__fileobj.seek (0)
@ -342,12 +340,15 @@ class LogFile (Producer):
def __init__ (self, filename, dispatcher):
import mmap
Producer.__init__ (self)
self.logger = logging.getLogger ("logfile")
self.path = os.path.normpath (os.path.abspath (filename))
self.fileobj = file (filename, "rb")
self.__real_fileobj = file (filename, "rb")
self.fileobj = mmap.mmap (self.__real_fileobj.fileno (), 0, prot = mmap.PROT_READ)
self.line_cache = LineCache (self.fileobj, dispatcher)
self.line_cache.consumers.append (self)

23
debug-viewer/GstDebugViewer/GUI.py
View file

@ -208,7 +208,7 @@ class LogModelBase (gtk.GenericTreeModel):
def iter_rows_offset (self):
for i, offset in enumerate (self.line_offsets):
self.ensure_cached (offset)
self.ensure_cached (i)
row = self.line_cache[offset]
row[self.COL_LEVEL] = self.line_levels[i] # FIXME
yield (row, offset,)
@ -260,7 +260,7 @@ class LogModelBase (gtk.GenericTreeModel):
return self.line_levels[line_index]
line_offset = self.line_offsets[line_index]
self.ensure_cached (line_offset)
self.ensure_cached (line_index)
value = self.line_cache[line_offset][col_id]
if col_id == self.COL_MESSAGE:
@ -335,10 +335,13 @@ class LazyLogModel (LogModelBase):
def access_offset (self, offset):
# TODO: Implement using one slice access instead of seek+readline.
self.__fileobj.seek (offset)
return self.__fileobj.readline ()
def ensure_cached (self, line_offset):
def ensure_cached (self, line_index):
line_offset = self.line_offsets[line_index]
if line_offset in self.line_cache:
return
@ -346,18 +349,12 @@ class LazyLogModel (LogModelBase):
if len (self.line_cache) > 10000:
self.line_cache.clear ()
if line_offset == 0:
self.__fileobj.seek (0)
if line_index == len (self.line_offsets) - 1:
self.__fileobj.seek (line_offset)
line = self.__fileobj.readline ()
else:
# Seek a bit further backwards to verify that offset (still) points
# to the beginning of a line:
self.__fileobj.seek (line_offset - len (os.linesep))
line_start = (self.__fileobj.readline () == os.linesep)
if not line_start:
# FIXME: We should re-read the file instead!
raise ValueError ("file changed!")
line = self.__fileobj.readline ()
next_offset = self.line_offsets[line_index + 1]
line = self.__fileobj[line_offset:next_offset]
self.line_cache[line_offset] = Data.LogLine.parse_full (line)