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transaction: add factory function to MutableRepo

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This helps finish the encapsulate of the `evolution` field.
This commit is contained in:
Martin von Zweigbergk 2021-01-31 17:12:40 -08:00
parent 5604303954
commit bf53c6c506
1 changed files with 25 additions and 18 deletions
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43
lib/src/transaction.rs
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@ -47,27 +47,13 @@ impl<'r> Transaction<'r> {
evolution: &ReadonlyEvolution<'r>,
description: &str,
) -> Transaction<'r> {
let mut_view = view.start_modification();
let internal = Arc::new(MutableRepo {
repo,
view: Some(mut_view),
evolution: None,
});
let repo_ref: &MutableRepo = internal.as_ref();
let static_lifetime_repo: &'static MutableRepo = unsafe { std::mem::transmute(repo_ref) };
let mut tx = Transaction {
repo: Some(internal),
let mut_repo = MutableRepo::new(repo, view, evolution);
Transaction {
repo: Some(mut_repo),
description: description.to_owned(),
start_time: Timestamp::now(),
closed: false,
};
let mut_evolution: MutableEvolution<'_, '_> =
evolution.start_modification(static_lifetime_repo);
let static_lifetime_mut_evolution: MutableEvolution<'static, 'static> =
unsafe { std::mem::transmute(mut_evolution) };
Arc::get_mut(tx.repo.as_mut().unwrap()).unwrap().evolution =
Some(static_lifetime_mut_evolution);
tx
}
}
pub fn base_repo(&self) -> &'r ReadonlyRepo {
@ -224,6 +210,27 @@ impl<'r> Repo for MutableRepo<'r> {
}
impl<'r> MutableRepo<'r> {
pub fn new(
repo: &'r ReadonlyRepo,
view: &ReadonlyView,
evolution: &ReadonlyEvolution<'r>,
) -> Arc<MutableRepo<'r>> {
let mut_view = view.start_modification();
let mut mut_repo = Arc::new(MutableRepo {
repo,
view: Some(mut_view),
evolution: None,
});
let repo_ref: &MutableRepo = mut_repo.as_ref();
let static_lifetime_repo: &'static MutableRepo = unsafe { std::mem::transmute(repo_ref) };
let mut_evolution: MutableEvolution<'_, '_> =
evolution.start_modification(static_lifetime_repo);
let static_lifetime_mut_evolution: MutableEvolution<'static, 'static> =
unsafe { std::mem::transmute(mut_evolution) };
Arc::get_mut(&mut mut_repo).unwrap().evolution = Some(static_lifetime_mut_evolution);
mut_repo
}
pub fn base_repo(&self) -> &'r ReadonlyRepo {
self.repo
}