[Updated] [+- ] D11837: rhg: Make Repo::dirstate_parents a LazyCell
SimonSapin
phabricator at mercurial-scm.org
Mon Dec 6 10:03:26 UTC 2021
SimonSapin updated this revision to Diff 31318.
REPOSITORY
rHG Mercurial
CHANGES SINCE LAST UPDATE
https://phab.mercurial-scm.org/D11837?vs=31266&id=31318
BRANCH
default
CHANGES SINCE LAST ACTION
https://phab.mercurial-scm.org/D11837/new/
REVISION DETAIL
https://phab.mercurial-scm.org/D11837
AFFECTED FILES
rust/hg-core/src/repo.rs
CHANGE DETAILS
diff --git a/rust/hg-core/src/repo.rs b/rust/hg-core/src/repo.rs
--- a/rust/hg-core/src/repo.rs
+++ b/rust/hg-core/src/repo.rs
@@ -16,7 +16,7 @@
use crate::vfs::{is_dir, is_file, Vfs};
use crate::{requirements, NodePrefix};
use crate::{DirstateError, Revision};
-use std::cell::{Cell, Ref, RefCell, RefMut};
+use std::cell::{Ref, RefCell, RefMut};
use std::collections::HashSet;
use std::path::{Path, PathBuf};
@@ -27,8 +27,7 @@
store: PathBuf,
requirements: HashSet<String>,
config: Config,
- // None means not known/initialized yet
- dirstate_parents: Cell<Option<DirstateParents>>,
+ dirstate_parents: LazyCell<DirstateParents, HgError>,
dirstate_map: LazyCell<OwningDirstateMap, DirstateError>,
changelog: LazyCell<Changelog, HgError>,
manifestlog: LazyCell<Manifestlog, HgError>,
@@ -203,7 +202,7 @@
store: store_path,
dot_hg,
config: repo_config,
- dirstate_parents: Cell::new(None),
+ dirstate_parents: LazyCell::new(Self::read_dirstate_parents),
dirstate_map: LazyCell::new(Self::new_dirstate_map),
changelog: LazyCell::new(Changelog::open),
manifestlog: LazyCell::new(Manifestlog::open),
@@ -273,9 +272,10 @@
}
pub fn dirstate_parents(&self) -> Result<DirstateParents, HgError> {
- if let Some(parents) = self.dirstate_parents.get() {
- return Ok(parents);
- }
+ Ok(*self.dirstate_parents.get_or_init(self)?)
+ }
+
+ fn read_dirstate_parents(&self) -> Result<DirstateParents, HgError> {
let dirstate = self.dirstate_file_contents()?;
let parents = if dirstate.is_empty() {
DirstateParents::NULL
@@ -285,20 +285,20 @@
crate::dirstate::parsers::parse_dirstate_parents(&dirstate)?
.clone()
};
- self.dirstate_parents.set(Some(parents));
+ self.dirstate_parents.set(parents);
Ok(parents)
}
fn new_dirstate_map(&self) -> Result<OwningDirstateMap, DirstateError> {
let dirstate_file_contents = self.dirstate_file_contents()?;
if dirstate_file_contents.is_empty() {
- self.dirstate_parents.set(Some(DirstateParents::NULL));
+ self.dirstate_parents.set(DirstateParents::NULL);
Ok(OwningDirstateMap::new_empty(Vec::new()))
} else if self.has_dirstate_v2() {
let docket = crate::dirstate_tree::on_disk::read_docket(
&dirstate_file_contents,
)?;
- self.dirstate_parents.set(Some(docket.parents()));
+ self.dirstate_parents.set(docket.parents());
let data_size = docket.data_size();
let metadata = docket.tree_metadata();
let mut map = if let Some(data_mmap) = self
@@ -318,7 +318,7 @@
let (on_disk, placeholder) = map.get_pair_mut();
let (inner, parents) = DirstateMap::new_v1(on_disk)?;
self.dirstate_parents
- .set(Some(parents.unwrap_or(DirstateParents::NULL)));
+ .set(parents.unwrap_or(DirstateParents::NULL));
*placeholder = inner;
Ok(map)
}
@@ -402,6 +402,10 @@
}
}
+ fn set(&self, value: T) {
+ *self.value.borrow_mut() = Some(value)
+ }
+
fn get_or_init(&self, repo: &Repo) -> Result<Ref<T>, E> {
let mut borrowed = self.value.borrow();
if borrowed.is_none() {
@@ -415,7 +419,7 @@
Ok(Ref::map(borrowed, |option| option.as_ref().unwrap()))
}
- pub fn get_mut_or_init(&self, repo: &Repo) -> Result<RefMut<T>, E> {
+ fn get_mut_or_init(&self, repo: &Repo) -> Result<RefMut<T>, E> {
let mut borrowed = self.value.borrow_mut();
if borrowed.is_none() {
*borrowed = Some((self.init)(repo)?);
To: SimonSapin, #hg-reviewers, Alphare
Cc: mercurial-patches
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