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# Copyright (C) 2006 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
"""Tests for tree transform performance"""
import os
import sys
from bzrlib.benchmarks import Benchmark
from bzrlib.log import log_formatter, show_log
from bzrlib.osutils import pathjoin
from cStringIO import StringIO
from bzrlib.transform import TreeTransform
from bzrlib.workingtree import WorkingTree
class LinesDone(Exception):
"""Raised when `LineConsumer` reaches the required number of lines."""
pass
class LineConsumer(object):
"""Count lines that are produced.
When the required number of lines have been reached, raise `LinesDone`.
"""
def __init__(self, required_lines):
"""Create a new consumer.
:param required_lines: How many lines must be produced.
:type required_lines: integer
"""
self.required_lines = required_lines
def write(self, text):
"""Write some text to the black hole.
But count how many lines have been written.
:param text: A string that would be written.
:raise LinesDone: when the required number of lines has been reached.
:return: None
"""
self.required_lines -= text.count('\n')
if self.required_lines < 0:
raise LinesDone()
class LogBenchmark(Benchmark):
"""Benchmarks for ``'bzr log'`` performance."""
def test_log(self):
"""Run log in a many-commit tree."""
tree = self.make_many_commit_tree(hardlink=True)
lf = log_formatter('long', to_file=StringIO())
self.time(show_log, tree.branch, lf, direction='reverse')
def test_merge_log(self):
"""Run log in a tree with many merges"""
tree = self.make_heavily_merged_tree(hardlink=True)
lf = log_formatter('short', to_file=StringIO())
self.time(show_log, tree.branch, lf, direction='reverse')
def test_log_screenful(self):
"""Simulate log --long|less"""
self.screenful_tester('long')
def test_log_screenful_line(self):
"""Simulate log --line|less"""
self.screenful_tester('line')
def test_log_screenful_short(self):
"""Simulate log --short|less"""
self.screenful_tester('short')
def screenful_tester(self, formatter):
"""Run show_log, but stop after 25 lines are generated"""
tree = self.make_many_commit_tree(hardlink=True)
def log_screenful():
lf = log_formatter(formatter, to_file=LineConsumer(25))
try:
show_log(tree.branch, lf, direction='reverse')
except LinesDone:
pass
else:
raise Exception, "LinesDone not raised"
self.time(log_screenful)
def test_cmd_log(self):
"""Test execution of the log command."""
tree = self.make_many_commit_tree(hardlink=True)
self.time(self.run_bzr, 'log', '-r', '-4..')
def test_cmd_log_subprocess(self):
"""Text startup and execution of the log command."""
tree = self.make_many_commit_tree(hardlink=True)
self.time(self.run_bzr_subprocess, 'log', '-r', '-4..')
def test_log_verbose(self):
"""'verbose' log -- shows file changes"""
tree = self.make_many_commit_tree(hardlink=True)
lf = log_formatter('long', to_file=StringIO())
self.time(show_log, tree.branch, lf, direction='reverse', verbose=True)
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