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comparison mercurial/revlog.py @ 38636:25534e0cf0d9

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revlog: _segmentspan computes the byte span of a segment Refactor out this code to be used somewhere else in a next changeset
author Paul Morelle <paul.morelle@octobus.net>
date Thu, 17 May 2018 15:10:36 +0200
parents d083ae26c325
children e33f784f2a44
comparison
equal deleted inserted replaced
38635:d083ae26c325 38636:25534e0cf0d9
208 while endidx > 1 and endidx > startidx and length(revs[endidx - 1]) == 0: 208 while endidx > 1 and endidx > startidx and length(revs[endidx - 1]) == 0:
209 endidx -= 1 209 endidx -= 1
210 210
211 return revs[startidx:endidx] 211 return revs[startidx:endidx]
212 212
213 def _segmentspan(revlog, revs):
214 """Get the byte span of a segment of revisions
215
216 revs is a sorted array of revision numbers
217 """
218 if not revs:
219 return 0
220 return revlog.end(revs[-1]) - revlog.start(revs[0])
221
213 def _slicechunk(revlog, revs): 222 def _slicechunk(revlog, revs):
214 """slice revs to reduce the amount of unrelated data to be read from disk. 223 """slice revs to reduce the amount of unrelated data to be read from disk.
215 224
216 ``revs`` is sliced into groups that should be read in one time. 225 ``revs`` is sliced into groups that should be read in one time.
217 Assume that revs are sorted. 226 Assume that revs are sorted.
221 230
222 if len(revs) <= 1: 231 if len(revs) <= 1:
223 yield revs 232 yield revs
224 return 233 return
225 234
226 startbyte = start(revs[0]) 235 readdata = deltachainspan = _segmentspan(revlog, revs)
227 endbyte = start(revs[-1]) + length(revs[-1])
228 readdata = deltachainspan = endbyte - startbyte
229 236
230 if deltachainspan < revlog._srmingapsize: 237 if deltachainspan < revlog._srmingapsize:
231 yield revs 238 yield revs
232 return 239 return
233 240