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Improved cache documentation (#4067)

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This commit is contained in:
Arkadiy Paronyan
2019-11-09 12:36:47 +01:00
committed by Gavin Wood
parent 38ac53434c
commit 4e54dfac14
1 changed files with 6 additions and 6 deletions
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substrate/core/client/db/src/storage_cache.rs
+6 -6
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@@ -155,13 +155,12 @@ impl<B: BlockT, H: Hasher> Cache<B, H> {
/// Synchronize the shared cache with the best block state.
/// This function updates the shared cache by removing entries
/// that are invalidated by chain reorganization. It should be
/// be called when chain reorg happens without importing a new block.
/// that are invalidated by chain reorganization. It should be called
/// externally when chain reorg happens without importing a new block.
pub fn sync(&mut self, enacted: &[B::Hash], retracted: &[B::Hash]) {
trace!("Syncing shared cache, enacted = {:?}, retracted = {:?}", enacted, retracted);
// Purge changes from re-enacted and retracted blocks.
// Filter out commiting block if any.
let mut clear = false;
for block in enacted {
clear = clear || {
@@ -313,6 +312,7 @@ impl<H: Hasher, B: BlockT> CacheChanges<H, B> {
let is_best = is_best();
trace!("Syncing cache, id = (#{:?}, {:?}), parent={:?}, best={}", commit_number, commit_hash, self.parent_hash, is_best);
let cache = &mut *cache;
// Filter out commiting block if any.
let enacted: Vec<_> = enacted
.iter()
.filter(|h| commit_hash.as_ref().map_or(true, |p| *h != p))
@@ -370,7 +370,7 @@ impl<H: Hasher, B: BlockT> CacheChanges<H, B> {
modifications.insert(k);
}
// Save modified storage. These are ordered by the block number.
// Save modified storage. These are ordered by the block number in reverse.
let block_changes = BlockChanges {
storage: modifications,
child_storage: child_modifications,
@@ -427,10 +427,10 @@ impl<H: Hasher, S: StateBackend<H>, B: BlockT> CachingState<H, S, B> {
}
Some(ref parent) => parent,
};
// Ignore all storage modified in later blocks
// Ignore all storage entries modified in later blocks.
// Modifications contains block ordered by the number
// We search for our parent in that list first and then for
// all its parent until we hit the canonical block,
// all its parents until we hit the canonical block,
// checking against all the intermediate modifications.
for m in modifications {
if &m.hash == parent {