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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&lt;<span class="prelude-ty">Option</span>&lt;Box&lt;<span class="kw">dyn </span>Fruit&gt;&gt;&gt;,
}
<span class="kw">pub struct </span>CollectorWrapper&lt;TCollector: Collector&gt;(TCollector);
<span class="kw">impl</span>&lt;TCollector: Collector&gt; Collector <span class="kw">for </span>CollectorWrapper&lt;TCollector&gt; {
<span class="kw">type </span>Fruit = Box&lt;<span class="kw">dyn </span>Fruit&gt;;
<span class="kw">type </span>Child = Box&lt;<span class="kw">dyn </span>BoxableSegmentCollector&gt;;
<span class="kw">fn </span>for_segment(
<span class="kw-2">&amp;</span><span class="self">self</span>,
segment_local_id: u32,
reader: <span class="kw-2">&amp;</span>SegmentReader,
) -&gt; <span class="kw">crate</span>::Result&lt;Box&lt;<span class="kw">dyn </span>BoxableSegmentCollector&gt;&gt; {
<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">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.<span class="number">0</span>.requires_scoring()
}
<span class="kw">fn </span>merge_fruits(
<span class="kw-2">&amp;</span><span class="self">self</span>,
children: Vec&lt;&lt;<span class="self">Self</span>::Child <span class="kw">as </span>SegmentCollector&gt;::Fruit&gt;,
) -&gt; <span class="kw">crate</span>::Result&lt;Box&lt;<span class="kw">dyn </span>Fruit&gt;&gt; {
<span class="kw">let </span>typed_fruit: Vec&lt;&lt;TCollector::Child <span class="kw">as </span>SegmentCollector&gt;::Fruit&gt; = children
.into_iter()
.map(|untyped_fruit| {
untyped_fruit
.downcast::&lt;&lt;TCollector::Child <span class="kw">as </span>SegmentCollector&gt;::Fruit&gt;()
.map(|boxed_but_typed| <span class="kw-2">*</span>boxed_but_typed)
.map_err(|<span class="kw">_</span>| {
TantivyError::InvalidArgument(<span class="string">&quot;Failed to cast child fruit.&quot;</span>.to_string())
})
})
.collect::&lt;<span class="kw">crate</span>::Result&lt;<span class="kw">_</span>&gt;&gt;()<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&lt;<span class="kw">dyn </span>BoxableSegmentCollector&gt; {
<span class="kw">type </span>Fruit = Box&lt;<span class="kw">dyn </span>Fruit&gt;;
<span class="kw">fn </span>collect(<span class="kw-2">&amp;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>) -&gt; Box&lt;<span class="kw">dyn </span>Fruit&gt; {
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">&amp;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&lt;<span class="self">Self</span>&gt;) -&gt; Box&lt;<span class="kw">dyn </span>Fruit&gt;;
}
<span class="kw">pub struct </span>SegmentCollectorWrapper&lt;TSegmentCollector: SegmentCollector&gt;(TSegmentCollector);
<span class="kw">impl</span>&lt;TSegmentCollector: SegmentCollector&gt; BoxableSegmentCollector
<span class="kw">for </span>SegmentCollectorWrapper&lt;TSegmentCollector&gt;
{
<span class="kw">fn </span>collect(<span class="kw-2">&amp;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&lt;<span class="self">Self</span>&gt;) -&gt; Box&lt;<span class="kw">dyn </span>Fruit&gt; {
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&lt;TFruit: Fruit&gt; {
pos: usize,
_phantom: PhantomData&lt;TFruit&gt;,
}
<span class="kw">impl</span>&lt;TFruit: Fruit&gt; FruitHandle&lt;TFruit&gt; {
<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">&amp;mut </span>MultiFruit) -&gt; TFruit {
<span class="kw">let </span>boxed_fruit = fruits.sub_fruits[<span class="self">self</span>.pos].take().expect(<span class="string">&quot;&quot;</span>);
<span class="kw-2">*</span>boxed_fruit
.downcast::&lt;TFruit&gt;()
.map_err(|<span class="kw">_</span>| ())
.expect(<span class="string">&quot;Failed to downcast collector fruit.&quot;</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() -&gt; tantivy::Result&lt;()&gt; {
/// let mut schema_builder = Schema::builder();
/// let title = schema_builder.add_text_field(&quot;title&quot;, 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 =&gt; &quot;The Name of the Wind&quot;))?;
/// index_writer.add_document(doc!(title =&gt; &quot;The Diary of Muadib&quot;))?;
/// index_writer.add_document(doc!(title =&gt; &quot;A Dairy Cow&quot;))?;
/// index_writer.add_document(doc!(title =&gt; &quot;The Diary of a Young Girl&quot;))?;
/// 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(&amp;index, vec![title]);
/// let query = query_parser.parse_query(&quot;diary&quot;).unwrap();
/// let mut multi_fruit = searcher.search(&amp;query, &amp;collectors).unwrap();
///
/// let count = count_handle.extract(&amp;mut multi_fruit);
/// let top_docs = top_docs_handle.extract(&amp;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&lt;<span class="lifetime">&#39;a</span>&gt; {
collector_wrappers: Vec&lt;
Box&lt;<span class="kw">dyn </span>Collector&lt;Child = Box&lt;<span class="kw">dyn </span>BoxableSegmentCollector&gt;, Fruit = Box&lt;<span class="kw">dyn </span>Fruit&gt;&gt; + <span class="lifetime">&#39;a</span>&gt;,
&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; MultiCollector&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="doccomment">/// Create a new `MultiCollector`
</span><span class="kw">pub fn </span>new() -&gt; <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&lt;<span class="lifetime">&#39;b</span>: <span class="lifetime">&#39;a</span>, TCollector: Collector + <span class="lifetime">&#39;b</span>&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
collector: TCollector,
) -&gt; FruitHandle&lt;TCollector::Fruit&gt; {
<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>&lt;<span class="lifetime">&#39;a</span>&gt; Collector <span class="kw">for </span>MultiCollector&lt;<span class="lifetime">&#39;a</span>&gt; {
<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">&amp;</span><span class="self">self</span>,
segment_local_id: SegmentOrdinal,
segment: <span class="kw-2">&amp;</span>SegmentReader,
) -&gt; <span class="kw">crate</span>::Result&lt;MultiCollectorChild&gt; {
<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::&lt;<span class="kw">crate</span>::Result&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;&gt;()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(MultiCollectorChild { children })
}
<span class="kw">fn </span>requires_scoring(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; 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">&amp;</span><span class="self">self</span>, segments_multifruits: Vec&lt;MultiFruit&gt;) -&gt; <span class="kw">crate</span>::Result&lt;MultiFruit&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>segment_fruits_list: Vec&lt;Vec&lt;Box&lt;<span class="kw">dyn </span>Fruit&gt;&gt;&gt; = (<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::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<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::&lt;<span class="kw">crate</span>::Result&lt;<span class="kw">_</span>&gt;&gt;()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(MultiFruit { sub_fruits })
}
}
<span class="kw">pub struct </span>MultiCollectorChild {
children: Vec&lt;Box&lt;<span class="kw">dyn </span>BoxableSegmentCollector&gt;&gt;,
}
<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">&amp;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">&amp;mut </span><span class="self">self</span>.children {
child.collect(doc, score);
}
}
<span class="kw">fn </span>harvest(<span class="self">self</span>) -&gt; 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() -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
<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">&quot;text&quot;</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=&gt;<span class="string">&quot;abc&quot;</span>))<span class="question-mark">?</span>;
index_writer.add_document(<span class="macro">doc!</span>(text=&gt;<span class="string">&quot;abc abc abc&quot;</span>))<span class="question-mark">?</span>;
index_writer.add_document(<span class="macro">doc!</span>(text=&gt;<span class="string">&quot;abc abc&quot;</span>))<span class="question-mark">?</span>;
index_writer.commit()<span class="question-mark">?</span>;
index_writer.add_document(<span class="macro">doc!</span>(text=&gt;<span class="string">&quot;&quot;</span>))<span class="question-mark">?</span>;
index_writer.add_document(<span class="macro">doc!</span>(text=&gt;<span class="string">&quot;abc abc abc abc&quot;</span>))<span class="question-mark">?</span>;
index_writer.add_document(<span class="macro">doc!</span>(text=&gt;<span class="string">&quot;abc&quot;</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">&quot;abc&quot;</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">&amp;</span>query, <span class="kw-2">&amp;</span>collectors).unwrap();
<span class="macro">assert_eq!</span>(count_handler.extract(<span class="kw-2">&amp;mut </span>multifruits), <span class="number">5</span>);
<span class="macro">assert_eq!</span>(topdocs_handler.extract(<span class="kw-2">&amp;mut </span>multifruits).len(), <span class="number">2</span>);
<span class="prelude-val">Ok</span>(())
}
}
</code></pre></div>
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