Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/branchmap.py @ 18124:79db6d40bced

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branchmap: store branchcache in a dedicated object Value and key of branchcache would benefit from being hold by the same object. Moreover some logic (update, write, validation) could be move on such object. The creation of this object is the first step toward this move. The result will clarify branchcache related code and hide most of the detail in the class itself. This encapsulation will greatly helps implementation of branchcache for filtered view of the repo.
author Pierre-Yves David <pierre-yves.david@logilab.fr>
date Sat, 22 Dec 2012 01:44:42 +0100
parents f8a13f061a8a
children ad194a8ab5c1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # branchmap.py - logic to computes, maintain and stores branchmap for local repo
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from node import bin, hex, nullid, nullrev
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9 import encoding
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10
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11 def read(repo):
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12 partial = branchcache()
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13 try:
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14 f = repo.opener("cache/branchheads")
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15 lines = f.read().split('\n')
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16 f.close()
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17 except (IOError, OSError):
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18 return branchcache(), nullid, nullrev
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19
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20 try:
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21 last, lrev = lines.pop(0).split(" ", 1)
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22 last, lrev = bin(last), int(lrev)
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23 if lrev >= len(repo) or repo[lrev].node() != last:
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24 # invalidate the cache
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25 raise ValueError('invalidating branch cache (tip differs)')
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26 for l in lines:
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27 if not l:
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28 continue
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29 node, label = l.split(" ", 1)
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30 label = encoding.tolocal(label.strip())
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31 if not node in repo:
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32 raise ValueError('invalidating branch cache because node '+
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33 '%s does not exist' % node)
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34 partial.setdefault(label, []).append(bin(node))
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35 except KeyboardInterrupt:
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36 raise
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37 except Exception, inst:
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38 if repo.ui.debugflag:
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39 repo.ui.warn(str(inst), '\n')
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40 partial, last, lrev = branchcache(), nullid, nullrev
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41 return partial, last, lrev
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42
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43 def write(repo, branches, tip, tiprev):
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44 try:
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45 f = repo.opener("cache/branchheads", "w", atomictemp=True)
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46 f.write("%s %s\n" % (hex(tip), tiprev))
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47 for label, nodes in branches.iteritems():
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48 for node in nodes:
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49 f.write("%s %s\n" % (hex(node), encoding.fromlocal(label)))
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50 f.close()
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51 except (IOError, OSError):
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52 pass
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53
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54 def update(repo, partial, ctxgen):
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55 """Given a branchhead cache, partial, that may have extra nodes or be
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56 missing heads, and a generator of nodes that are at least a superset of
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57 heads missing, this function updates partial to be correct.
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58 """
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59 # collect new branch entries
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60 newbranches = {}
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61 for c in ctxgen:
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62 newbranches.setdefault(c.branch(), []).append(c.node())
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63 # if older branchheads are reachable from new ones, they aren't
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64 # really branchheads. Note checking parents is insufficient:
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65 # 1 (branch a) -> 2 (branch b) -> 3 (branch a)
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66 for branch, newnodes in newbranches.iteritems():
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67 bheads = partial.setdefault(branch, [])
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68 # Remove candidate heads that no longer are in the repo (e.g., as
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69 # the result of a strip that just happened). Avoid using 'node in
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70 # self' here because that dives down into branchcache code somewhat
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71 # recursively.
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72 bheadrevs = [repo.changelog.rev(node) for node in bheads
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73 if repo.changelog.hasnode(node)]
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74 newheadrevs = [repo.changelog.rev(node) for node in newnodes
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75 if repo.changelog.hasnode(node)]
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76 ctxisnew = bheadrevs and min(newheadrevs) > max(bheadrevs)
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77 # Remove duplicates - nodes that are in newheadrevs and are already
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78 # in bheadrevs. This can happen if you strip a node whose parent
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79 # was already a head (because they're on different branches).
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80 bheadrevs = sorted(set(bheadrevs).union(newheadrevs))
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81
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82 # Starting from tip means fewer passes over reachable. If we know
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83 # the new candidates are not ancestors of existing heads, we don't
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84 # have to examine ancestors of existing heads
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85 if ctxisnew:
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86 iterrevs = sorted(newheadrevs)
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87 else:
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88 iterrevs = list(bheadrevs)
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89
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90 # This loop prunes out two kinds of heads - heads that are
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91 # superseded by a head in newheadrevs, and newheadrevs that are not
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92 # heads because an existing head is their descendant.
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93 while iterrevs:
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94 latest = iterrevs.pop()
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95 if latest not in bheadrevs:
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96 continue
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97 ancestors = set(repo.changelog.ancestors([latest],
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98 bheadrevs[0]))
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99 if ancestors:
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100 bheadrevs = [b for b in bheadrevs if b not in ancestors]
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101 partial[branch] = [repo.changelog.node(rev) for rev in bheadrevs]
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102
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103 # There may be branches that cease to exist when the last commit in the
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104 # branch was stripped. This code filters them out. Note that the
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105 # branch that ceased to exist may not be in newbranches because
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106 # newbranches is the set of candidate heads, which when you strip the
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107 # last commit in a branch will be the parent branch.
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108 for branch in partial.keys():
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109 nodes = [head for head in partial[branch]
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110 if repo.changelog.hasnode(head)]
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111 if not nodes:
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112 del partial[branch]
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113
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114 def updatecache(repo):
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115 repo = repo.unfiltered() # Until we get a smarter cache management
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116 cl = repo.changelog
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117 tip = cl.tip()
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118 if repo._branchcache is not None and repo._branchcachetip == tip:
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119 return
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120
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121 oldtip = repo._branchcachetip
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122 if oldtip is None or oldtip not in cl.nodemap:
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123 partial, last, lrev = read(repo)
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124 else:
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125 lrev = cl.rev(oldtip)
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126 partial = repo._branchcache
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127
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128 catip = repo._cacheabletip()
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129 # if lrev == catip: cache is already up to date
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130 # if lrev > catip: we have uncachable element in `partial` can't write
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131 # on disk
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132 if lrev < catip:
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133 ctxgen = (repo[r] for r in cl.revs(lrev + 1, catip))
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134 update(repo, partial, ctxgen)
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135 write(repo, partial, cl.node(catip), catip)
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136 lrev = catip
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137 # If cacheable tip were lower than actual tip, we need to update the
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138 # cache up to tip. This update (from cacheable to actual tip) is not
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139 # written to disk since it's not cacheable.
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140 tiprev = len(repo) - 1
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141 if lrev < tiprev:
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142 ctxgen = (repo[r] for r in cl.revs(lrev + 1, tiprev))
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143 update(repo, partial, ctxgen)
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144 repo._branchcache = partial
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145 repo._branchcachetip = tip
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146
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147 class branchcache(dict):
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148 """A dict like object that hold branches heads cache"""
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149