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| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::{HashMap, HashSet}; |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Debug, Display, Formatter}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::core::{SegmentId, SegmentMeta}; |
| <span class="kw">use </span><span class="kw">crate</span>::indexer::delete_queue::DeleteCursor; |
| <span class="kw">use </span><span class="kw">crate</span>::indexer::segment_entry::SegmentEntry; |
| |
| <span class="doccomment">/// The segment register keeps track |
| /// of the list of segment, their size as well |
| /// as the state they are in. |
| /// |
| /// It is consumed by indexes to get the list of |
| /// segments that are currently searchable, |
| /// and by the index merger to identify |
| /// merge candidates. |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub struct </span>SegmentRegister { |
| segment_states: HashMap<SegmentId, SegmentEntry>, |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>SegmentRegister { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>Formatter<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><(), fmt::Error> { |
| <span class="macro">write!</span>(f, <span class="string">"SegmentRegister("</span>)<span class="question-mark">?</span>; |
| <span class="kw">for </span>k <span class="kw">in </span><span class="self">self</span>.segment_states.keys() { |
| <span class="macro">write!</span>(f, <span class="string">"{}, "</span>, k.short_uuid_string())<span class="question-mark">?</span>; |
| } |
| <span class="macro">write!</span>(f, <span class="string">")"</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| <span class="kw">impl </span>Display <span class="kw">for </span>SegmentRegister { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>Formatter<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><(), fmt::Error> { |
| <span class="macro">write!</span>(f, <span class="string">"SegmentRegister("</span>)<span class="question-mark">?</span>; |
| <span class="kw">for </span>k <span class="kw">in </span><span class="self">self</span>.segment_states.keys() { |
| <span class="macro">write!</span>(f, <span class="string">"{}, "</span>, k.short_uuid_string())<span class="question-mark">?</span>; |
| } |
| <span class="macro">write!</span>(f, <span class="string">")"</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>SegmentRegister { |
| <span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.segment_states.clear(); |
| } |
| |
| <span class="kw">pub fn </span>get_mergeable_segments( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| in_merge_segment_ids: <span class="kw-2">&</span>HashSet<SegmentId>, |
| ) -> Vec<SegmentMeta> { |
| <span class="self">self</span>.segment_states |
| .values() |
| .filter(|segment_entry| !in_merge_segment_ids.contains(<span class="kw-2">&</span>segment_entry.segment_id())) |
| .map(|segment_entry| segment_entry.meta().clone()) |
| .collect() |
| } |
| |
| <span class="kw">pub fn </span>segment_ids(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<SegmentId> { |
| <span class="self">self</span>.segment_states.keys().cloned().collect() |
| } |
| |
| <span class="kw">pub fn </span>segment_entries(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<SegmentEntry> { |
| <span class="self">self</span>.segment_states.values().cloned().collect() |
| } |
| |
| <span class="kw">pub fn </span>segment_metas(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<SegmentMeta> { |
| <span class="self">self</span>.segment_states |
| .values() |
| .map(|segment_entry| segment_entry.meta().clone()) |
| .collect() |
| } |
| |
| <span class="kw">pub fn </span>contains_all(<span class="kw-2">&</span><span class="self">self</span>, segment_ids: <span class="kw-2">&</span>[SegmentId]) -> bool { |
| segment_ids |
| .iter() |
| .all(|segment_id| <span class="self">self</span>.segment_states.contains_key(segment_id)) |
| } |
| |
| <span class="kw">pub fn </span>add_segment_entry(<span class="kw-2">&mut </span><span class="self">self</span>, segment_entry: SegmentEntry) { |
| <span class="kw">let </span>segment_id = segment_entry.segment_id(); |
| <span class="self">self</span>.segment_states.insert(segment_id, segment_entry); |
| } |
| |
| <span class="kw">pub fn </span>remove_segment(<span class="kw-2">&mut </span><span class="self">self</span>, segment_id: <span class="kw-2">&</span>SegmentId) { |
| <span class="self">self</span>.segment_states.remove(segment_id); |
| } |
| |
| <span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, segment_id: <span class="kw-2">&</span>SegmentId) -> <span class="prelude-ty">Option</span><SegmentEntry> { |
| <span class="self">self</span>.segment_states.get(segment_id).cloned() |
| } |
| |
| <span class="kw">pub fn </span>new(segment_metas: Vec<SegmentMeta>, delete_cursor: <span class="kw-2">&</span>DeleteCursor) -> SegmentRegister { |
| <span class="kw">let </span><span class="kw-2">mut </span>segment_states = HashMap::new(); |
| <span class="kw">for </span>segment_meta <span class="kw">in </span>segment_metas { |
| <span class="kw">let </span>segment_id = segment_meta.id(); |
| <span class="kw">let </span>segment_entry = SegmentEntry::new(segment_meta, delete_cursor.clone(), <span class="prelude-val">None</span>); |
| segment_states.insert(segment_id, segment_entry); |
| } |
| SegmentRegister { segment_states } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::core::{SegmentId, SegmentMetaInventory}; |
| <span class="kw">use </span><span class="kw">crate</span>::indexer::delete_queue::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn </span>segment_ids(segment_register: <span class="kw-2">&</span>SegmentRegister) -> Vec<SegmentId> { |
| segment_register |
| .segment_metas() |
| .into_iter() |
| .map(|segment_meta| segment_meta.id()) |
| .collect() |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_segment_register() { |
| <span class="kw">let </span>inventory = SegmentMetaInventory::default(); |
| <span class="kw">let </span>delete_queue = DeleteQueue::new(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>segment_register = SegmentRegister::default(); |
| <span class="kw">let </span>segment_id_a = SegmentId::generate_random(); |
| <span class="kw">let </span>segment_id_b = SegmentId::generate_random(); |
| <span class="kw">let </span>segment_id_merged = SegmentId::generate_random(); |
| |
| { |
| <span class="kw">let </span>segment_meta = inventory.new_segment_meta(segment_id_a, <span class="number">0u32</span>); |
| <span class="kw">let </span>segment_entry = SegmentEntry::new(segment_meta, delete_queue.cursor(), <span class="prelude-val">None</span>); |
| segment_register.add_segment_entry(segment_entry); |
| } |
| <span class="macro">assert_eq!</span>(segment_ids(<span class="kw-2">&</span>segment_register), <span class="macro">vec!</span>[segment_id_a]); |
| { |
| <span class="kw">let </span>segment_meta = inventory.new_segment_meta(segment_id_b, <span class="number">0u32</span>); |
| <span class="kw">let </span>segment_entry = SegmentEntry::new(segment_meta, delete_queue.cursor(), <span class="prelude-val">None</span>); |
| segment_register.add_segment_entry(segment_entry); |
| } |
| segment_register.remove_segment(<span class="kw-2">&</span>segment_id_a); |
| segment_register.remove_segment(<span class="kw-2">&</span>segment_id_b); |
| { |
| <span class="kw">let </span>segment_meta_merged = inventory.new_segment_meta(segment_id_merged, <span class="number">0u32</span>); |
| <span class="kw">let </span>segment_entry = SegmentEntry::new(segment_meta_merged, delete_queue.cursor(), <span class="prelude-val">None</span>); |
| segment_register.add_segment_entry(segment_entry); |
| } |
| <span class="macro">assert_eq!</span>(segment_ids(<span class="kw-2">&</span>segment_register), <span class="macro">vec!</span>[segment_id_merged]); |
| } |
| } |
| </code></pre></div> |
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