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| </pre><pre class="rust"><code><span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::ops::Deref; |
| |
| <span class="kw">use super</span>::{Collector, SegmentCollector}; |
| <span class="kw">use </span><span class="kw">crate</span>::collector::Fruit; |
| <span class="kw">use crate</span>::{DocId, Score, SegmentOrdinal, SegmentReader, TantivyError}; |
| |
| <span class="doccomment">/// MultiFruit keeps Fruits from every nested Collector |
| </span><span class="kw">pub struct </span>MultiFruit { |
| sub_fruits: Vec<<span class="prelude-ty">Option</span><Box<<span class="kw">dyn </span>Fruit>>>, |
| } |
| |
| <span class="kw">pub struct </span>CollectorWrapper<TCollector: Collector>(TCollector); |
| |
| <span class="kw">impl</span><TCollector: Collector> Collector <span class="kw">for </span>CollectorWrapper<TCollector> { |
| <span class="kw">type </span>Fruit = Box<<span class="kw">dyn </span>Fruit>; |
| <span class="kw">type </span>Child = Box<<span class="kw">dyn </span>BoxableSegmentCollector>; |
| |
| <span class="kw">fn </span>for_segment( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| segment_local_id: u32, |
| reader: <span class="kw-2">&</span>SegmentReader, |
| ) -> <span class="kw">crate</span>::Result<Box<<span class="kw">dyn </span>BoxableSegmentCollector>> { |
| <span class="kw">let </span>child = <span class="self">self</span>.<span class="number">0</span>.for_segment(segment_local_id, reader)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Box::new(SegmentCollectorWrapper(child))) |
| } |
| |
| <span class="kw">fn </span>requires_scoring(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.requires_scoring() |
| } |
| |
| <span class="kw">fn </span>merge_fruits( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| children: Vec<<<span class="self">Self</span>::Child <span class="kw">as </span>SegmentCollector>::Fruit>, |
| ) -> <span class="kw">crate</span>::Result<Box<<span class="kw">dyn </span>Fruit>> { |
| <span class="kw">let </span>typed_fruit: Vec<<TCollector::Child <span class="kw">as </span>SegmentCollector>::Fruit> = children |
| .into_iter() |
| .map(|untyped_fruit| { |
| untyped_fruit |
| .downcast::<<TCollector::Child <span class="kw">as </span>SegmentCollector>::Fruit>() |
| .map(|boxed_but_typed| <span class="kw-2">*</span>boxed_but_typed) |
| .map_err(|<span class="kw">_</span>| { |
| TantivyError::InvalidArgument(<span class="string">"Failed to cast child fruit."</span>.to_string()) |
| }) |
| }) |
| .collect::<<span class="kw">crate</span>::Result<<span class="kw">_</span>>>()<span class="question-mark">?</span>; |
| <span class="kw">let </span>merged_fruit = <span class="self">self</span>.<span class="number">0</span>.merge_fruits(typed_fruit)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Box::new(merged_fruit)) |
| } |
| } |
| |
| <span class="kw">impl </span>SegmentCollector <span class="kw">for </span>Box<<span class="kw">dyn </span>BoxableSegmentCollector> { |
| <span class="kw">type </span>Fruit = Box<<span class="kw">dyn </span>Fruit>; |
| |
| <span class="kw">fn </span>collect(<span class="kw-2">&mut </span><span class="self">self</span>, doc: u32, score: Score) { |
| <span class="self">self</span>.as_mut().collect(doc, score); |
| } |
| |
| <span class="kw">fn </span>harvest(<span class="self">self</span>) -> Box<<span class="kw">dyn </span>Fruit> { |
| BoxableSegmentCollector::harvest_from_box(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">pub trait </span>BoxableSegmentCollector { |
| <span class="kw">fn </span>collect(<span class="kw-2">&mut </span><span class="self">self</span>, doc: u32, score: Score); |
| <span class="kw">fn </span>harvest_from_box(<span class="self">self</span>: Box<<span class="self">Self</span>>) -> Box<<span class="kw">dyn </span>Fruit>; |
| } |
| |
| <span class="kw">pub struct </span>SegmentCollectorWrapper<TSegmentCollector: SegmentCollector>(TSegmentCollector); |
| |
| <span class="kw">impl</span><TSegmentCollector: SegmentCollector> BoxableSegmentCollector |
| <span class="kw">for </span>SegmentCollectorWrapper<TSegmentCollector> |
| { |
| <span class="kw">fn </span>collect(<span class="kw-2">&mut </span><span class="self">self</span>, doc: u32, score: Score) { |
| <span class="self">self</span>.<span class="number">0</span>.collect(doc, score); |
| } |
| |
| <span class="kw">fn </span>harvest_from_box(<span class="self">self</span>: Box<<span class="self">Self</span>>) -> Box<<span class="kw">dyn </span>Fruit> { |
| Box::new(<span class="self">self</span>.<span class="number">0</span>.harvest()) |
| } |
| } |
| |
| <span class="doccomment">/// FruitHandle stores reference to the corresponding collector inside MultiCollector |
| </span><span class="kw">pub struct </span>FruitHandle<TFruit: Fruit> { |
| pos: usize, |
| _phantom: PhantomData<TFruit>, |
| } |
| |
| <span class="kw">impl</span><TFruit: Fruit> FruitHandle<TFruit> { |
| <span class="doccomment">/// Extract a typed fruit off a multifruit. |
| /// |
| /// This function involves downcasting and can panic if the multifruit was |
| /// created using faulty code. |
| </span><span class="kw">pub fn </span>extract(<span class="self">self</span>, fruits: <span class="kw-2">&mut </span>MultiFruit) -> TFruit { |
| <span class="kw">let </span>boxed_fruit = fruits.sub_fruits[<span class="self">self</span>.pos].take().expect(<span class="string">""</span>); |
| <span class="kw-2">*</span>boxed_fruit |
| .downcast::<TFruit>() |
| .map_err(|<span class="kw">_</span>| ()) |
| .expect(<span class="string">"Failed to downcast collector fruit."</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Multicollector makes it possible to collect on more than one collector. |
| /// It should only be used for use cases where the Collector types is unknown |
| /// at compile time. |
| /// |
| /// If the type of the collectors is known, you can just group yours collectors |
| /// in a tuple. See the |
| /// [Combining several collectors section of the collector |
| /// documentation](./index.html#combining-several-collectors). |
| /// |
| /// ```rust |
| /// use tantivy::collector::{Count, TopDocs, MultiCollector}; |
| /// use tantivy::query::QueryParser; |
| /// use tantivy::schema::{Schema, TEXT}; |
| /// use tantivy::{doc, Index}; |
| /// |
| /// # fn main() -> tantivy::Result<()> { |
| /// let mut schema_builder = Schema::builder(); |
| /// let title = schema_builder.add_text_field("title", TEXT); |
| /// let schema = schema_builder.build(); |
| /// let index = Index::create_in_ram(schema); |
| /// let mut index_writer = index.writer(3_000_000)?; |
| /// index_writer.add_document(doc!(title => "The Name of the Wind"))?; |
| /// index_writer.add_document(doc!(title => "The Diary of Muadib"))?; |
| /// index_writer.add_document(doc!(title => "A Dairy Cow"))?; |
| /// index_writer.add_document(doc!(title => "The Diary of a Young Girl"))?; |
| /// index_writer.commit()?; |
| /// |
| /// let reader = index.reader()?; |
| /// let searcher = reader.searcher(); |
| /// |
| /// let mut collectors = MultiCollector::new(); |
| /// let top_docs_handle = collectors.add_collector(TopDocs::with_limit(2)); |
| /// let count_handle = collectors.add_collector(Count); |
| /// let query_parser = QueryParser::for_index(&index, vec![title]); |
| /// let query = query_parser.parse_query("diary").unwrap(); |
| /// let mut multi_fruit = searcher.search(&query, &collectors).unwrap(); |
| /// |
| /// let count = count_handle.extract(&mut multi_fruit); |
| /// let top_docs = top_docs_handle.extract(&mut multi_fruit); |
| /// |
| /// assert_eq!(count, 2); |
| /// assert_eq!(top_docs.len(), 2); |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[allow(clippy::type_complexity)] |
| #[derive(Default)] |
| </span><span class="kw">pub struct </span>MultiCollector<<span class="lifetime">'a</span>> { |
| collector_wrappers: Vec< |
| Box<<span class="kw">dyn </span>Collector<Child = Box<<span class="kw">dyn </span>BoxableSegmentCollector>, Fruit = Box<<span class="kw">dyn </span>Fruit>> + <span class="lifetime">'a</span>>, |
| >, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> MultiCollector<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Create a new `MultiCollector` |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| Default::default() |
| } |
| |
| <span class="doccomment">/// Add a new collector to our `MultiCollector`. |
| </span><span class="kw">pub fn </span>add_collector<<span class="lifetime">'b</span>: <span class="lifetime">'a</span>, TCollector: Collector + <span class="lifetime">'b</span>>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| collector: TCollector, |
| ) -> FruitHandle<TCollector::Fruit> { |
| <span class="kw">let </span>pos = <span class="self">self</span>.collector_wrappers.len(); |
| <span class="self">self</span>.collector_wrappers |
| .push(Box::new(CollectorWrapper(collector))); |
| FruitHandle { |
| pos, |
| _phantom: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Collector <span class="kw">for </span>MultiCollector<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Fruit = MultiFruit; |
| <span class="kw">type </span>Child = MultiCollectorChild; |
| |
| <span class="kw">fn </span>for_segment( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| segment_local_id: SegmentOrdinal, |
| segment: <span class="kw-2">&</span>SegmentReader, |
| ) -> <span class="kw">crate</span>::Result<MultiCollectorChild> { |
| <span class="kw">let </span>children = <span class="self">self |
| </span>.collector_wrappers |
| .iter() |
| .map(|collector_wrapper| collector_wrapper.for_segment(segment_local_id, segment)) |
| .collect::<<span class="kw">crate</span>::Result<Vec<<span class="kw">_</span>>>>()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(MultiCollectorChild { children }) |
| } |
| |
| <span class="kw">fn </span>requires_scoring(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.collector_wrappers |
| .iter() |
| .map(Deref::deref) |
| .any(Collector::requires_scoring) |
| } |
| |
| <span class="kw">fn </span>merge_fruits(<span class="kw-2">&</span><span class="self">self</span>, segments_multifruits: Vec<MultiFruit>) -> <span class="kw">crate</span>::Result<MultiFruit> { |
| <span class="kw">let </span><span class="kw-2">mut </span>segment_fruits_list: Vec<Vec<Box<<span class="kw">dyn </span>Fruit>>> = (<span class="number">0</span>..<span class="self">self</span>.collector_wrappers.len()) |
| .map(|<span class="kw">_</span>| Vec::with_capacity(segments_multifruits.len())) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">for </span>segment_multifruit <span class="kw">in </span>segments_multifruits { |
| <span class="kw">for </span>(idx, segment_fruit_opt) <span class="kw">in </span>segment_multifruit.sub_fruits.into_iter().enumerate() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(segment_fruit) = segment_fruit_opt { |
| segment_fruits_list[idx].push(segment_fruit); |
| } |
| } |
| } |
| <span class="kw">let </span>sub_fruits = <span class="self">self |
| </span>.collector_wrappers |
| .iter() |
| .zip(segment_fruits_list) |
| .map(|(child_collector, segment_fruits)| { |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(child_collector.merge_fruits(segment_fruits)<span class="question-mark">?</span>)) |
| }) |
| .collect::<<span class="kw">crate</span>::Result<<span class="kw">_</span>>>()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(MultiFruit { sub_fruits }) |
| } |
| } |
| |
| <span class="kw">pub struct </span>MultiCollectorChild { |
| children: Vec<Box<<span class="kw">dyn </span>BoxableSegmentCollector>>, |
| } |
| |
| <span class="kw">impl </span>SegmentCollector <span class="kw">for </span>MultiCollectorChild { |
| <span class="kw">type </span>Fruit = MultiFruit; |
| |
| <span class="kw">fn </span>collect(<span class="kw-2">&mut </span><span class="self">self</span>, doc: DocId, score: Score) { |
| <span class="kw">for </span>child <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.children { |
| child.collect(doc, score); |
| } |
| } |
| |
| <span class="kw">fn </span>harvest(<span class="self">self</span>) -> MultiFruit { |
| MultiFruit { |
| sub_fruits: <span class="self">self |
| </span>.children |
| .into_iter() |
| .map(|child| <span class="prelude-val">Some</span>(child.harvest())) |
| .collect(), |
| } |
| } |
| } |
| |
| <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>::collector::{Count, TopDocs}; |
| <span class="kw">use </span><span class="kw">crate</span>::query::TermQuery; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::{IndexRecordOption, Schema, TEXT}; |
| <span class="kw">use crate</span>::{Index, Term}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_multi_collector() -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>schema_builder = Schema::builder(); |
| <span class="kw">let </span>text = schema_builder.add_text_field(<span class="string">"text"</span>, TEXT); |
| <span class="kw">let </span>schema = schema_builder.build(); |
| |
| <span class="kw">let </span>index = Index::create_in_ram(schema); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>index_writer = index.writer_for_tests()<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">"abc"</span>))<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">"abc abc abc"</span>))<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">"abc abc"</span>))<span class="question-mark">?</span>; |
| index_writer.commit()<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">""</span>))<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">"abc abc abc abc"</span>))<span class="question-mark">?</span>; |
| index_writer.add_document(<span class="macro">doc!</span>(text=><span class="string">"abc"</span>))<span class="question-mark">?</span>; |
| index_writer.commit()<span class="question-mark">?</span>; |
| } |
| <span class="kw">let </span>searcher = index.reader()<span class="question-mark">?</span>.searcher(); |
| <span class="kw">let </span>term = Term::from_field_text(text, <span class="string">"abc"</span>); |
| <span class="kw">let </span>query = TermQuery::new(term, IndexRecordOption::Basic); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>collectors = MultiCollector::new(); |
| <span class="kw">let </span>topdocs_handler = collectors.add_collector(TopDocs::with_limit(<span class="number">2</span>)); |
| <span class="kw">let </span>count_handler = collectors.add_collector(Count); |
| <span class="kw">let </span><span class="kw-2">mut </span>multifruits = searcher.search(<span class="kw-2">&</span>query, <span class="kw-2">&</span>collectors).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(count_handler.extract(<span class="kw-2">&mut </span>multifruits), <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(topdocs_handler.extract(<span class="kw-2">&mut </span>multifruits).len(), <span class="number">2</span>); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |