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| </pre><pre class="rust"><code><span class="kw">use </span>common::{BinarySerializable, VInt}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::directory::OwnedBytes; |
| <span class="kw">use </span><span class="kw">crate</span>::store::index::block::CheckpointBlock; |
| <span class="kw">use </span><span class="kw">crate</span>::store::index::Checkpoint; |
| <span class="kw">use </span><span class="kw">crate</span>::DocId; |
| |
| <span class="kw">pub struct </span>LayerCursor<<span class="lifetime">'a</span>> { |
| remaining: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8], |
| block: CheckpointBlock, |
| cursor: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>LayerCursor<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = Checkpoint; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Checkpoint> { |
| <span class="kw">if </span><span class="self">self</span>.cursor == <span class="self">self</span>.block.len() { |
| <span class="kw">if </span><span class="self">self</span>.remaining.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>(block_mut, remaining_mut) = (<span class="kw-2">&mut </span><span class="self">self</span>.block, <span class="kw-2">&mut </span><span class="self">self</span>.remaining); |
| block_mut.deserialize(remaining_mut).ok()<span class="question-mark">?</span>; |
| <span class="self">self</span>.cursor = <span class="number">0</span>; |
| } |
| <span class="kw">let </span>res = <span class="prelude-val">Some</span>(<span class="self">self</span>.block.get(<span class="self">self</span>.cursor)); |
| <span class="self">self</span>.cursor += <span class="number">1</span>; |
| res |
| } |
| } |
| |
| <span class="kw">struct </span>Layer { |
| data: OwnedBytes, |
| } |
| |
| <span class="kw">impl </span>Layer { |
| <span class="kw">fn </span>cursor(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw">impl </span>Iterator<Item = Checkpoint> + <span class="lifetime">'_ </span>{ |
| <span class="self">self</span>.cursor_at_offset(<span class="number">0</span>) |
| } |
| |
| <span class="kw">fn </span>cursor_at_offset(<span class="kw-2">&</span><span class="self">self</span>, start_offset: usize) -> <span class="kw">impl </span>Iterator<Item = Checkpoint> + <span class="lifetime">'_ </span>{ |
| <span class="kw">let </span>data = <span class="kw-2">&</span><span class="self">self</span>.data.as_slice(); |
| LayerCursor { |
| remaining: <span class="kw-2">&</span>data[start_offset..], |
| block: CheckpointBlock::default(), |
| cursor: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>seek_start_at_offset(<span class="kw-2">&</span><span class="self">self</span>, target: DocId, offset: usize) -> <span class="prelude-ty">Option</span><Checkpoint> { |
| <span class="self">self</span>.cursor_at_offset(offset) |
| .find(|checkpoint| checkpoint.doc_range.end > target) |
| } |
| } |
| |
| <span class="kw">pub struct </span>SkipIndex { |
| layers: Vec<Layer>, |
| } |
| |
| <span class="kw">impl </span>SkipIndex { |
| <span class="kw">pub fn </span>open(<span class="kw-2">mut </span>data: OwnedBytes) -> SkipIndex { |
| <span class="kw">let </span>offsets: Vec<u64> = Vec::<VInt>::deserialize(<span class="kw-2">&mut </span>data) |
| .unwrap() |
| .into_iter() |
| .map(|el| el.<span class="number">0</span>) |
| .collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>start_offset = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>layers = Vec::new(); |
| <span class="kw">for </span>end_offset <span class="kw">in </span>offsets { |
| <span class="kw">let </span>layer = Layer { |
| data: data.slice(start_offset <span class="kw">as </span>usize..end_offset <span class="kw">as </span>usize), |
| }; |
| layers.push(layer); |
| start_offset = end_offset; |
| } |
| SkipIndex { layers } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>checkpoints(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw">impl </span>Iterator<Item = Checkpoint> + <span class="lifetime">'_ </span>{ |
| <span class="self">self</span>.layers |
| .last() |
| .into_iter() |
| .flat_map(|layer| layer.cursor()) |
| } |
| |
| <span class="kw">pub fn </span>seek(<span class="kw-2">&</span><span class="self">self</span>, target: DocId) -> <span class="prelude-ty">Option</span><Checkpoint> { |
| <span class="kw">let </span>first_layer_len = <span class="self">self |
| </span>.layers |
| .first() |
| .map(|layer| layer.data.len()) |
| .unwrap_or(<span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>cur_checkpoint = Checkpoint { |
| doc_range: <span class="number">0u32</span>..<span class="number">1u32</span>, |
| byte_range: <span class="number">0</span>..first_layer_len, |
| }; |
| <span class="kw">for </span>layer <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.layers { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(checkpoint) = |
| layer.seek_start_at_offset(target, cur_checkpoint.byte_range.start) |
| { |
| cur_checkpoint = checkpoint; |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| <span class="prelude-val">Some</span>(cur_checkpoint) |
| } |
| } |
| </code></pre></div> |
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