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comparison mercurial/branchmap.py @ 20181:b9515fb9e72a

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branchmap: add documentation on the branchcache on-disk format
author Brodie Rao <brodie@sf.io>
date Fri, 15 Nov 2013 23:18:08 -0500
parents 175c6fd8cacc
children 7d4219512823
comparison
equal deleted inserted replaced
20180:969148b49fc6 20181:b9515fb9e72a
92 partial.write(repo) 92 partial.write(repo)
93 assert partial.validfor(repo), filtername 93 assert partial.validfor(repo), filtername
94 repo._branchcaches[repo.filtername] = partial 94 repo._branchcaches[repo.filtername] = partial
95 95
96 class branchcache(dict): 96 class branchcache(dict):
97 """A dict like object that hold branches heads cache""" 97 """A dict like object that hold branches heads cache.
98
99 This cache is used to avoid costly computations to determine all the
100 branch heads of a repo.
101
102 The cache is serialized on disk in the following format:
103
104 <tip hex node> <tip rev number> [optional filtered repo hex hash]
105 <branch head hex node> <branch name>
106 <branch head hex node> <branch name>
107 ...
108
109 The first line is used to check if the cache is still valid. If the
110 branch cache is for a filtered repo view, an optional third hash is
111 included that hashes the hashes of all filtered revisions.
112 """
98 113
99 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, 114 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
100 filteredhash=None): 115 filteredhash=None):
101 super(branchcache, self).__init__(entries) 116 super(branchcache, self).__init__(entries)
102 self.tipnode = tipnode 117 self.tipnode = tipnode