cache: introduce an abstract class for cache we can upgrade incrementally
Right now each class implements their own mechanism for validation, and
update. We start introducing abstract class to ultimately allow more
unification of the cache code.
The end goal of this series is to introduce a cache for some obsolescence
property, not to actually implement the cache. However, taking advantage of
adding a new cache to introduce the abstract class seems like a win.
This code was headed for core during the 4.3 cycle but never made it there. So
we starts with a copy in the evolve repository.
$ cat >> $HGRCPATH <<EOF
> [defaults]
> amend=-d "0 0"
> [web]
> push_ssl = false
> allow_push = *
> [phases]
> publish = False
> [alias]
> qlog = log --template='{rev} - {node|short} {desc} ({phase})\n'
> [diff]
> git = 1
> unified = 0
> [extensions]
> EOF
$ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
$ mkcommit() {
> echo "$1" >> "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ hg init local
$ hg init other
$ cd local
$ touch 1 2 3 4 5 6 7 8 9 0
$ hg add 1 2 3 4 5 6 7 8 9 0
$ mkcommit A
$ mkcommit B
$ mkcommit C
$ hg log -G
@ changeset: 2:829b19580856
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add C
|
o changeset: 1:97b8f02ab29e
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add B
|
o changeset: 0:5d8dabd3961b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add A
$ hg push ../other
pushing to ../other
searching for changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 13 changes to 13 files
$ hg -R ../other verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
13 files, 3 changesets, 13 total revisions
$ mkcommit D
$ mkcommit E
$ hg up -q .^^
$ hg revert -r tip -a -q
$ hg ci -m 'coin' -q
$ hg log -G
@ changeset: 5:8313a6afebbb
| tag: tip
| parent: 2:829b19580856
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: coin
|
| o changeset: 4:076ec8ade1ac
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: add E
| |
| o changeset: 3:824d9bb109f6
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add D
|
o changeset: 2:829b19580856
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add C
|
o changeset: 1:97b8f02ab29e
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add B
|
o changeset: 0:5d8dabd3961b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add A
$ hg prune --fold -n -1 -- -2 -3
2 changesets pruned
$ hg push ../other
pushing to ../other
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 2 changes to 2 files
2 new obsolescence markers
$ hg -R ../other verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
15 files, 4 changesets, 15 total revisions