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use crate::{ffi, ColumnFamily, DBIterator, DBRawIterator, Error, IteratorMode, ReadOptions, DB};
pub struct Snapshot<'a> {
db: &'a DB,
pub(crate) inner: *const ffi::rocksdb_snapshot_t,
}
impl<'a> Snapshot<'a> {
pub fn new(db: &DB) -> Snapshot {
let snapshot = unsafe { ffi::rocksdb_create_snapshot(db.inner) };
Snapshot {
db,
inner: snapshot,
}
}
pub fn iterator(&self, mode: IteratorMode) -> DBIterator<'a> {
let readopts = ReadOptions::default();
self.iterator_opt(mode, readopts)
}
pub fn iterator_cf(&self, cf_handle: &ColumnFamily, mode: IteratorMode) -> DBIterator {
let readopts = ReadOptions::default();
self.iterator_cf_opt(cf_handle, readopts, mode)
}
pub fn iterator_opt(&self, mode: IteratorMode, mut readopts: ReadOptions) -> DBIterator<'a> {
readopts.set_snapshot(self);
DBIterator::new(self.db, readopts, mode)
}
pub fn iterator_cf_opt(
&self,
cf_handle: &ColumnFamily,
mut readopts: ReadOptions,
mode: IteratorMode,
) -> DBIterator {
readopts.set_snapshot(self);
DBIterator::new_cf(self.db, cf_handle, readopts, mode)
}
pub fn raw_iterator(&self) -> DBRawIterator {
let readopts = ReadOptions::default();
self.raw_iterator_opt(readopts)
}
pub fn raw_iterator_cf(&self, cf_handle: &ColumnFamily) -> DBRawIterator {
let readopts = ReadOptions::default();
self.raw_iterator_cf_opt(cf_handle, readopts)
}
pub fn raw_iterator_opt(&self, mut readopts: ReadOptions) -> DBRawIterator {
readopts.set_snapshot(self);
DBRawIterator::new(self.db, readopts)
}
pub fn raw_iterator_cf_opt(
&self,
cf_handle: &ColumnFamily,
mut readopts: ReadOptions,
) -> DBRawIterator {
readopts.set_snapshot(self);
DBRawIterator::new_cf(self.db, cf_handle, readopts)
}
pub fn get<K: AsRef<[u8]>>(&self, key: K) -> Result<Option<Vec<u8>>, Error> {
let readopts = ReadOptions::default();
self.get_opt(key, readopts)
}
pub fn get_cf<K: AsRef<[u8]>>(
&self,
cf: &ColumnFamily,
key: K,
) -> Result<Option<Vec<u8>>, Error> {
let readopts = ReadOptions::default();
self.get_cf_opt(cf, key.as_ref(), readopts)
}
pub fn get_opt<K: AsRef<[u8]>>(
&self,
key: K,
mut readopts: ReadOptions,
) -> Result<Option<Vec<u8>>, Error> {
readopts.set_snapshot(self);
self.db.get_opt(key.as_ref(), &readopts)
}
pub fn get_cf_opt<K: AsRef<[u8]>>(
&self,
cf: &ColumnFamily,
key: K,
mut readopts: ReadOptions,
) -> Result<Option<Vec<u8>>, Error> {
readopts.set_snapshot(self);
self.db.get_cf_opt(cf, key.as_ref(), &readopts)
}
}
impl<'a> Drop for Snapshot<'a> {
fn drop(&mut self) {
unsafe {
ffi::rocksdb_release_snapshot(self.db.inner, self.inner);
}
}
}
unsafe impl<'a> Send for Snapshot<'a> {}
unsafe impl<'a> Sync for Snapshot<'a> {}