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add key abstraction and prepare for MVCC (#28)

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* add key abstraction and prepare for MVCC

Signed-off-by: Alex Chi <iskyzh@gmail.com>

* a little bit type exercise

Signed-off-by: Alex Chi <iskyzh@gmail.com>

* refactor tests

Signed-off-by: Alex Chi <iskyzh@gmail.com>

* fix clippy warnings

Signed-off-by: Alex Chi <iskyzh@gmail.com>

* refactor starter code

Signed-off-by: Alex Chi <iskyzh@gmail.com>

* final touch docs

Signed-off-by: Alex Chi <iskyzh@gmail.com>

---------

Signed-off-by: Alex Chi <iskyzh@gmail.com>
This commit is contained in:
Alex Chi Z
2024-01-25 10:59:08 +08:00
committed by GitHub
parent 2fefe3e505
commit a3a92359e1
42 changed files with 824 additions and 281 deletions
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12
mini-lsm-starter/src/iterators/merge_iterator.rs
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@@ -6,6 +6,8 @@ use std::collections::BinaryHeap;
use anyhow::Result;
use crate::key::KeySlice;
use super::StorageIterator;
struct HeapWrapper<I: StorageIterator>(pub usize, pub Box<I>);
@@ -21,7 +23,7 @@ impl<I: StorageIterator> Eq for HeapWrapper<I> {}
impl<I: StorageIterator> PartialOrd for HeapWrapper<I> {
#[allow(clippy::non_canonical_partial_ord_impl)]
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
match self.1.key().cmp(other.1.key()) {
match self.1.key().cmp(&other.1.key()) {
cmp::Ordering::Greater => Some(cmp::Ordering::Greater),
cmp::Ordering::Less => Some(cmp::Ordering::Less),
cmp::Ordering::Equal => self.0.partial_cmp(&other.0),
@@ -49,8 +51,12 @@ impl<I: StorageIterator> MergeIterator<I> {
}
}
impl<I: StorageIterator> StorageIterator for MergeIterator<I> {
fn key(&self) -> &[u8] {
impl<I: 'static + for<'a> StorageIterator<KeyType<'a> = KeySlice<'a>>> StorageIterator
for MergeIterator<I>
{
type KeyType<'a> = KeySlice<'a>;
fn key(&self) -> KeySlice {
unimplemented!()
}