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-rw-r--r--src/db/lib.rs7
-rw-r--r--src/db/lmdb_adapter.rs4
-rw-r--r--src/db/sqlite_adapter.rs4
3 files changed, 15 insertions, 0 deletions
diff --git a/src/db/lib.rs b/src/db/lib.rs
index d96586be..11cae4e3 100644
--- a/src/db/lib.rs
+++ b/src/db/lib.rs
@@ -181,6 +181,10 @@ impl Tree {
pub fn len(&self) -> Result<usize> {
self.0.len(self.1)
}
+ #[inline]
+ pub fn fast_len(&self) -> Result<Option<usize>> {
+ self.0.fast_len(self.1)
+ }
#[inline]
pub fn first(&self) -> Result<Option<(Value, Value)>> {
@@ -323,6 +327,9 @@ pub(crate) trait IDb: Send + Sync {
fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>>;
fn len(&self, tree: usize) -> Result<usize>;
+ fn fast_len(&self, _tree: usize) -> Result<Option<usize>> {
+ Ok(None)
+ }
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>>;
fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>>;
diff --git a/src/db/lmdb_adapter.rs b/src/db/lmdb_adapter.rs
index c036c990..31956612 100644
--- a/src/db/lmdb_adapter.rs
+++ b/src/db/lmdb_adapter.rs
@@ -121,6 +121,10 @@ impl IDb for LmdbDb {
Ok(tree.len(&tx)?.try_into().unwrap())
}
+ fn fast_len(&self, tree: usize) -> Result<Option<usize>> {
+ Ok(Some(self.len(tree)?))
+ }
+
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
let tree = self.get_tree(tree)?;
let mut tx = self.db.write_txn()?;
diff --git a/src/db/sqlite_adapter.rs b/src/db/sqlite_adapter.rs
index 886fda6e..63b4506e 100644
--- a/src/db/sqlite_adapter.rs
+++ b/src/db/sqlite_adapter.rs
@@ -144,6 +144,10 @@ impl IDb for SqliteDb {
}
}
+ fn fast_len(&self, tree: usize) -> Result<Option<usize>> {
+ Ok(Some(self.len(tree)?))
+ }
+
fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
trace!("insert {}: lock db", tree);
let this = self.0.lock().unwrap();