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This commit is contained in:
Tomasz Drwięga 2016-03-12 10:41:35 +01:00
parent d0f7555348
commit c6dc6c0c41
1 changed files with 17 additions and 17 deletions
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34
util/src/journaldb/overlay.rs
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@ -33,14 +33,14 @@ use super::JournalDB;
/// immediately. Rather some age (based on a linear but arbitrary metric) must pass before
/// the removals actually take effect.
///
/// There are two memory overlays:
/// - Transaction overlay contains current transaction data. It is merged with with history
/// There are two memory overlays:
/// - Transaction overlay contains current transaction data. It is merged with with history
/// overlay on each `commit()`
/// - History overlay contains all data inserted during the history period. When the node
/// - History overlay contains all data inserted during the history period. When the node
/// in the overlay becomes ancient it is written to disk on `commit()`
///
/// There is also a journal maintained in memory and on the disk as well which lists insertions
/// and removals for each commit during the history period. This is used to track
/// There is also a journal maintained in memory and on the disk as well which lists insertions
/// and removals for each commit during the history period. This is used to track
/// data nodes that go out of history scope and must be written to disk.
///
/// Commit workflow:
@ -50,12 +50,12 @@ use super::JournalDB;
/// 3. Clear the transaction overlay.
/// 4. For a canonical journal record that becomes ancient inserts its insertions into the disk DB
/// 5. For each journal record that goes out of the history scope (becomes ancient) remove its
/// insertions from the history overlay, decreasing the reference counter and removing entry if
/// insertions from the history overlay, decreasing the reference counter and removing entry if
/// if reaches zero.
/// 6. For a canonical journal record that becomes ancient delete its removals from the disk only if
/// 6. For a canonical journal record that becomes ancient delete its removals from the disk only if
/// the removed key is not present in the history overlay.
/// 7. Delete ancient record from memory and disk.
///
///
pub struct JournalOverlayDB {
transaction_overlay: MemoryDB,
backing: Arc<Database>,
@ -223,7 +223,7 @@ impl JournalDB for JournalOverlayDB {
let mut tx = self.transaction_overlay.drain();
let inserted_keys: Vec<_> = tx.iter().filter_map(|(k, &(_, c))| if c > 0 { Some(k.clone()) } else { None }).collect();
let removed_keys: Vec<_> = tx.iter().filter_map(|(k, &(_, c))| if c < 0 { Some(k.clone()) } else { None }).collect();
// Increase counter for each inserted key no matter if the block is canonical or not.
// Increase counter for each inserted key no matter if the block is canonical or not.
let insertions = tx.drain().filter_map(|(k, (v, c))| if c > 0 { Some((k, v)) } else { None });
r.append(id);
r.begin_list(inserted_keys.len());
@ -236,7 +236,7 @@ impl JournalDB for JournalOverlayDB {
r.append(&removed_keys);
let mut k = RlpStream::new_list(3);
let index = journal_overlay.journal.get(&now).map(|j| j.len()).unwrap_or(0);
let index = journal_overlay.journal.get(&now).map_or(0, |j| j.len());
k.append(&now);
k.append(&index);
k.append(&&PADDING[..]);
@ -345,14 +345,14 @@ impl HashDB for JournalOverlayDB {
self.lookup(key).is_some()
}
fn insert(&mut self, value: &[u8]) -> H256 {
fn insert(&mut self, value: &[u8]) -> H256 {
self.transaction_overlay.insert(value)
}
fn emplace(&mut self, key: H256, value: Bytes) {
self.transaction_overlay.emplace(key, value);
self.transaction_overlay.emplace(key, value);
}
fn kill(&mut self, key: &H256) {
self.transaction_overlay.kill(key);
fn kill(&mut self, key: &H256) {
self.transaction_overlay.kill(key);
}
}
@ -749,7 +749,7 @@ mod tests {
assert!(jdb.can_reconstruct_refs());
assert!(!jdb.exists(&foo));
}
#[test]
fn reopen_test() {
let mut dir = ::std::env::temp_dir();
@ -784,7 +784,7 @@ mod tests {
jdb.commit(7, &b"7".sha3(), Some((3, b"3".sha3()))).unwrap();
assert!(jdb.can_reconstruct_refs());
}
#[test]
fn reopen_remove_three() {
init_log();
@ -838,7 +838,7 @@ mod tests {
assert!(!jdb.exists(&foo));
}
}
#[test]
fn reopen_fork() {
let mut dir = ::std::env::temp_dir();