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inotify: server: new data structure to keep track of changes....
inotify: server: new data structure to keep track of changes. == Rationale for the new structure == Current structure was a dictionary tree. One directory was tracked as a dictionary: - keys: file/subdir name - values: - for a file, the status (a/r/m/...) - for a subdir, the directory representing the subdir It allowed efficient lookups, no matter of the type of the terminal leaf: for part in path.split('/'): tree = tree[part] However, there is no way to represent a directory and a file with the same name because keys are conflicting in the dictionary. Concrete example: Initial state: root dir |- foo (file) |- bar (file) # data state is: {'foo': 'n', 'bar': 'n'} Remove foo: root dir |- bar (file) # Data becomes {'foo': 'r'} until next commit. Add foo, as a directory, and foo/barbar file: root dir |- bar (file) |-> foo (dir) |- barbar (file) # New state should be represented as: {'foo': {'barbar': 'a'}, 'bar': 'n'} however, the key "foo" is already used and represents the old file. The dirstate: D foo A foo/barbar cannot be represented, hence the need for a new structure. == The new structure == 'directory' class. Represents one directory level. * Notable attributes: Two dictionaries: - 'files' Maps filename -> status for the current dir. - 'dirs' Maps subdir's name -> directory object representing the subdir * methods - walk(), formerly server.walk - lookup(), old server.lookup - dir(), old server.dir This new class allows embedding all the tree walks/lookups in its own class, instead of having everything mixed together in server. Incidently, since files and directories are not stored in the same dictionaries, we are solving the previous key conflict problem. The small drawback is that lookup operation is a bit more complex: for a path a/b/c/d/e we have to check twice the leaf, if e is a directory or a file.
Dirkjan Ochtman - - Load All Authors

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test-excessive-merge.out
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
created new head
changeset: 4:f6c172c6198c
tag: tip
parent: 1:448a8c5e42f1
parent: 2:7c5dc2e857f2
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: merge a/b -> blah
changeset: 3:13d875a22764
parent: 2:7c5dc2e857f2
parent: 1:448a8c5e42f1
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: merge b/a -> blah
changeset: 2:7c5dc2e857f2
parent: 0:dc1751ec2e9d
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: branch b
changeset: 1:448a8c5e42f1
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: branch a
changeset: 0:dc1751ec2e9d
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: test
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