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Reduce Fragment size by not storing ReplicaId twice

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This commit is contained in:
Antonio Scandurra 2021-06-04 18:03:44 +02:00
parent 8f8c6c8add
commit 5d1afaf484
1 changed files with 65 additions and 54 deletions
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119
zed/src/editor/buffer.rs
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@ -169,7 +169,7 @@ impl History {
}
fn push(&mut self, op: EditOperation) {
self.ops.insert(op.id, op);
self.ops.insert(op.timestamp.local(), op);
}
fn start_transaction(
@ -326,12 +326,34 @@ struct Diff {
changes: Vec<(ChangeTag, usize)>,
}
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
struct InsertionTimestamp {
replica_id: ReplicaId,
local: time::Seq,
lamport: time::Seq,
}
impl InsertionTimestamp {
fn local(&self) -> time::Local {
time::Local {
replica_id: self.replica_id,
value: self.local,
}
}
fn lamport(&self) -> time::Lamport {
time::Lamport {
replica_id: self.replica_id,
value: self.lamport,
}
}
}
#[derive(Eq, PartialEq, Clone, Debug)]
struct Fragment {
timestamp: InsertionTimestamp,
len: usize,
visible: bool,
insertion_id: time::Local,
lamport_timestamp: time::Lamport,
deletions: HashSet<time::Local>,
max_undos: time::Global,
}
@ -359,10 +381,7 @@ impl<'a> sum_tree::Dimension<'a, FragmentSummary> for FragmentTextSummary {
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Operation {
Edit {
edit: EditOperation,
lamport_timestamp: time::Lamport,
},
Edit(EditOperation),
Undo {
undo: UndoOperation,
lamport_timestamp: time::Lamport,
@ -376,7 +395,7 @@ pub enum Operation {
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct EditOperation {
id: time::Local,
timestamp: InsertionTimestamp,
version: time::Global,
ranges: Vec<Range<usize>>,
new_text: Option<String>,
@ -457,12 +476,11 @@ impl Buffer {
if visible_text.len() > 0 {
fragments.push(
Fragment {
insertion_id: Default::default(),
lamport_timestamp: Default::default(),
timestamp: Default::default(),
len: visible_text.len(),
visible: true,
deletions: Default::default(),
max_undos: Default::default(),
visible: true,
},
&None,
);
@ -932,21 +950,21 @@ impl Buffer {
None
} else {
self.start_transaction_at(None, Instant::now()).unwrap();
let edit_id = self.local_clock.tick();
let lamport_timestamp = self.lamport_clock.tick();
let edit = self.apply_local_edit(&ranges, new_text, edit_id, lamport_timestamp);
let timestamp = InsertionTimestamp {
replica_id: self.replica_id,
local: self.local_clock.tick().value,
lamport: self.lamport_clock.tick().value,
};
let edit = self.apply_local_edit(&ranges, new_text, timestamp);
self.history.push(edit.clone());
self.history.push_undo(edit.id);
self.last_edit = edit.id;
self.version.observe(edit.id);
self.history.push_undo(edit.timestamp.local());
self.last_edit = edit.timestamp.local();
self.version.observe(edit.timestamp.local());
self.end_transaction_at(None, Instant::now(), cx).unwrap();
Some(Operation::Edit {
edit,
lamport_timestamp,
})
Some(Operation::Edit(edit))
}
}
@ -1067,20 +1085,15 @@ impl Buffer {
fn apply_op(&mut self, op: Operation) -> Result<()> {
match op {
Operation::Edit {
edit,
lamport_timestamp,
..
} => {
if !self.version.observed(edit.id) {
Operation::Edit(edit) => {
if !self.version.observed(edit.timestamp.local()) {
self.apply_remote_edit(
&edit.version,
&edit.ranges,
edit.new_text.as_deref(),
edit.id,
lamport_timestamp,
edit.timestamp,
);
self.version.observe(edit.id);
self.version.observe(edit.timestamp.local());
self.history.push(edit);
}
}
@ -1116,8 +1129,7 @@ impl Buffer {
version: &time::Global,
ranges: &[Range<usize>],
new_text: Option<&str>,
local_timestamp: time::Local,
lamport_timestamp: time::Lamport,
timestamp: InsertionTimestamp,
) {
if ranges.is_empty() {
return;
@ -1171,7 +1183,9 @@ impl Buffer {
// Skip over insertions that are concurrent to this edit, but have a lower lamport
// timestamp.
while let Some(fragment) = old_fragments.item() {
if fragment_start == range.start && fragment.lamport_timestamp > lamport_timestamp {
if fragment_start == range.start
&& fragment.timestamp.lamport() > timestamp.lamport()
{
new_ropes.push_fragment(fragment, fragment.visible);
new_fragments.push(fragment.clone(), &None);
old_fragments.next(&cx);
@ -1196,8 +1210,7 @@ impl Buffer {
new_ropes.push_str(new_text);
new_fragments.push(
Fragment {
insertion_id: local_timestamp,
lamport_timestamp,
timestamp,
len: new_text.len(),
deletions: Default::default(),
max_undos: Default::default(),
@ -1216,7 +1229,7 @@ impl Buffer {
let intersection_end = cmp::min(range.end, fragment_end);
if fragment.was_visible(version, &self.undo_map) {
intersection.len = intersection_end - fragment_start;
intersection.deletions.insert(local_timestamp);
intersection.deletions.insert(timestamp.local());
intersection.visible = false;
}
if intersection.len > 0 {
@ -1252,8 +1265,8 @@ impl Buffer {
self.fragments = new_fragments;
self.visible_text = visible_text;
self.deleted_text = deleted_text;
self.local_clock.observe(local_timestamp);
self.lamport_clock.observe(lamport_timestamp);
self.local_clock.observe(timestamp.local());
self.lamport_clock.observe(timestamp.lamport());
}
pub fn undo(&mut self, mut cx: Option<&mut ModelContext<Self>>) -> Vec<Operation> {
@ -1355,7 +1368,7 @@ impl Buffer {
let mut fragment = fragment.clone();
let fragment_was_visible = fragment.visible;
if fragment.was_visible(&edit.version, &self.undo_map)
|| fragment.insertion_id == edit.id
|| fragment.timestamp.local() == edit.timestamp.local()
{
fragment.visible = fragment.is_visible(&self.undo_map);
fragment.max_undos.observe(undo.id);
@ -1403,7 +1416,7 @@ impl Buffer {
false
} else {
match op {
Operation::Edit { edit, .. } => self.version >= edit.version,
Operation::Edit(edit) => self.version >= edit.version,
Operation::Undo { undo, .. } => self.version.observed(undo.edit_id),
Operation::UpdateSelections { selections, .. } => {
if let Some(selections) = selections {
@ -1430,11 +1443,10 @@ impl Buffer {
&mut self,
ranges: &[Range<usize>],
new_text: Option<String>,
local_timestamp: time::Local,
lamport_timestamp: time::Lamport,
timestamp: InsertionTimestamp,
) -> EditOperation {
let mut edit = EditOperation {
id: local_timestamp,
timestamp,
version: self.version(),
ranges: Vec::with_capacity(ranges.len()),
new_text: None,
@ -1487,8 +1499,7 @@ impl Buffer {
new_ropes.push_str(new_text);
new_fragments.push(
Fragment {
insertion_id: local_timestamp,
lamport_timestamp,
timestamp,
len: new_text.len(),
deletions: Default::default(),
max_undos: Default::default(),
@ -1507,7 +1518,7 @@ impl Buffer {
let intersection_end = cmp::min(range.end, fragment_end);
if fragment.visible {
intersection.len = intersection_end - fragment_start;
intersection.deletions.insert(local_timestamp);
intersection.deletions.insert(timestamp.local());
intersection.visible = false;
}
if intersection.len > 0 {
@ -1987,11 +1998,13 @@ impl<'a> Iterator for HighlightedChunks<'a> {
impl Fragment {
fn is_visible(&self, undos: &UndoMap) -> bool {
!undos.is_undone(self.insertion_id) && self.deletions.iter().all(|d| undos.is_undone(*d))
!undos.is_undone(self.timestamp.local())
&& self.deletions.iter().all(|d| undos.is_undone(*d))
}
fn was_visible(&self, version: &time::Global, undos: &UndoMap) -> bool {
(version.observed(self.insertion_id) && !undos.was_undone(self.insertion_id, version))
(version.observed(self.timestamp.local())
&& !undos.was_undone(self.timestamp.local(), version))
&& self
.deletions
.iter()
@ -2004,14 +2017,14 @@ impl sum_tree::Item for Fragment {
fn summary(&self) -> Self::Summary {
let mut max_version = time::Global::new();
max_version.observe(self.insertion_id);
max_version.observe(self.timestamp.local());
for deletion in &self.deletions {
max_version.observe(*deletion);
}
max_version.join(&self.max_undos);
let mut min_insertion_version = time::Global::new();
min_insertion_version.observe(self.insertion_id);
min_insertion_version.observe(self.timestamp.local());
let max_insertion_version = min_insertion_version.clone();
if self.visible {
FragmentSummary {
@ -2124,9 +2137,7 @@ impl Operation {
fn lamport_timestamp(&self) -> time::Lamport {
match self {
Operation::Edit {
lamport_timestamp, ..
} => *lamport_timestamp,
Operation::Edit(edit) => edit.timestamp.lamport(),
Operation::Undo {
lamport_timestamp, ..
} => *lamport_timestamp,
@ -3474,7 +3485,7 @@ mod tests {
impl Operation {
fn edit_id(&self) -> Option<time::Local> {
match self {
Operation::Edit { edit, .. } => Some(edit.id),
Operation::Edit(edit) => Some(edit.timestamp.local()),
Operation::Undo { undo, .. } => Some(undo.edit_id),
Operation::UpdateSelections { .. } => None,
}