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| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::ops::Range; |
| |
| <span class="kw">use </span>rustc_hash::FxHashMap; |
| |
| <span class="kw">use </span><span class="kw">super</span>::stacker::Addr; |
| <span class="kw">use </span><span class="kw">crate</span>::fastfield::MultiValuedFastFieldWriter; |
| <span class="kw">use </span><span class="kw">crate</span>::fieldnorm::FieldNormReaders; |
| <span class="kw">use </span><span class="kw">crate</span>::indexer::doc_id_mapping::DocIdMapping; |
| <span class="kw">use </span><span class="kw">crate</span>::postings::recorder::{BufferLender, Recorder}; |
| <span class="kw">use </span><span class="kw">crate</span>::postings::{ |
| FieldSerializer, IndexingContext, InvertedIndexSerializer, PerFieldPostingsWriter, |
| UnorderedTermId, |
| }; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::{Field, FieldType, Schema, Term}; |
| <span class="kw">use </span><span class="kw">crate</span>::termdict::TermOrdinal; |
| <span class="kw">use </span><span class="kw">crate</span>::tokenizer::{Token, TokenStream, MAX_TOKEN_LEN}; |
| <span class="kw">use </span><span class="kw">crate</span>::DocId; |
| |
| <span class="kw">const </span>POSITION_GAP: u32 = <span class="number">1</span>; |
| |
| <span class="kw">fn </span>make_field_partition( |
| term_offsets: <span class="kw-2">&</span>[(Term<<span class="kw-2">&</span>[u8]>, Addr, UnorderedTermId)], |
| ) -> Vec<(Field, Range<usize>)> { |
| <span class="kw">let </span>term_offsets_it = term_offsets |
| .iter() |
| .map(|(term, <span class="kw">_</span>, <span class="kw">_</span>)| term.field()) |
| .enumerate(); |
| <span class="kw">let </span><span class="kw-2">mut </span>prev_field_opt = <span class="prelude-val">None</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>fields = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>offsets = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>(offset, field) <span class="kw">in </span>term_offsets_it { |
| <span class="kw">if </span><span class="prelude-val">Some</span>(field) != prev_field_opt { |
| prev_field_opt = <span class="prelude-val">Some</span>(field); |
| fields.push(field); |
| offsets.push(offset); |
| } |
| } |
| offsets.push(term_offsets.len()); |
| <span class="kw">let </span><span class="kw-2">mut </span>field_offsets = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..fields.len() { |
| field_offsets.push((fields[i], offsets[i]..offsets[i + <span class="number">1</span>])); |
| } |
| field_offsets |
| } |
| |
| <span class="doccomment">/// Serialize the inverted index. |
| /// It pushes all term, one field at a time, towards the |
| /// postings serializer. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>serialize_postings( |
| ctx: IndexingContext, |
| per_field_postings_writers: <span class="kw-2">&</span>PerFieldPostingsWriter, |
| fieldnorm_readers: FieldNormReaders, |
| doc_id_map: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>DocIdMapping>, |
| schema: <span class="kw-2">&</span>Schema, |
| serializer: <span class="kw-2">&mut </span>InvertedIndexSerializer, |
| ) -> <span class="kw">crate</span>::Result<HashMap<Field, FxHashMap<UnorderedTermId, TermOrdinal>>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>term_offsets: Vec<(Term<<span class="kw-2">&</span>[u8]>, Addr, UnorderedTermId)> = |
| Vec::with_capacity(ctx.term_index.len()); |
| term_offsets.extend(ctx.term_index.iter()); |
| term_offsets.sort_unstable_by_key(|(k, <span class="kw">_</span>, <span class="kw">_</span>)| k.clone()); |
| <span class="kw">let </span><span class="kw-2">mut </span>unordered_term_mappings: HashMap<Field, FxHashMap<UnorderedTermId, TermOrdinal>> = |
| HashMap::new(); |
| |
| <span class="kw">let </span>field_offsets = make_field_partition(<span class="kw-2">&</span>term_offsets); |
| <span class="kw">for </span>(field, byte_offsets) <span class="kw">in </span>field_offsets { |
| <span class="kw">let </span>field_entry = schema.get_field_entry(field); |
| <span class="kw">match </span><span class="kw-2">*</span>field_entry.field_type() { |
| FieldType::Str(<span class="kw">_</span>) | FieldType::Facet(<span class="kw">_</span>) => { |
| <span class="comment">// populating the (unordered term ord) -> (ordered term ord) mapping |
| // for the field. |
| </span><span class="kw">let </span>unordered_term_ids = term_offsets[byte_offsets.clone()] |
| .iter() |
| .map(|<span class="kw-2">&</span>(<span class="kw">_</span>, <span class="kw">_</span>, bucket)| bucket); |
| <span class="kw">let </span>mapping: FxHashMap<UnorderedTermId, TermOrdinal> = unordered_term_ids |
| .enumerate() |
| .map(|(term_ord, unord_term_id)| { |
| (unord_term_id <span class="kw">as </span>UnorderedTermId, term_ord <span class="kw">as </span>TermOrdinal) |
| }) |
| .collect(); |
| unordered_term_mappings.insert(field, mapping); |
| } |
| FieldType::U64(<span class="kw">_</span>) |
| | FieldType::I64(<span class="kw">_</span>) |
| | FieldType::F64(<span class="kw">_</span>) |
| | FieldType::Date(<span class="kw">_</span>) |
| | FieldType::Bool(<span class="kw">_</span>) => {} |
| FieldType::Bytes(<span class="kw">_</span>) => {} |
| FieldType::JsonObject(<span class="kw">_</span>) => {} |
| FieldType::IpAddr(<span class="kw">_</span>) => {} |
| } |
| |
| <span class="kw">let </span>postings_writer = per_field_postings_writers.get_for_field(field); |
| <span class="kw">let </span>fieldnorm_reader = fieldnorm_readers.get_field(field)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>field_serializer = |
| serializer.new_field(field, postings_writer.total_num_tokens(), fieldnorm_reader)<span class="question-mark">?</span>; |
| postings_writer.serialize( |
| <span class="kw-2">&</span>term_offsets[byte_offsets], |
| doc_id_map, |
| <span class="kw-2">&</span>ctx, |
| <span class="kw-2">&mut </span>field_serializer, |
| )<span class="question-mark">?</span>; |
| field_serializer.close()<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(unordered_term_mappings) |
| } |
| |
| <span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>IndexingPosition { |
| <span class="kw">pub </span>num_tokens: u32, |
| <span class="kw">pub </span>end_position: u32, |
| } |
| |
| <span class="doccomment">/// The `PostingsWriter` is in charge of receiving documenting |
| /// and building a `Segment` in anonymous memory. |
| /// |
| /// `PostingsWriter` writes in a `MemoryArena`. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>PostingsWriter: Send + Sync { |
| <span class="doccomment">/// Record that a document contains a term at a given position. |
| /// |
| /// * doc - the document id |
| /// * pos - the term position (expressed in tokens) |
| /// * term - the term |
| /// * ctx - Contains a term hashmap and a memory arena to store all necessary posting list |
| /// information. |
| </span><span class="kw">fn </span>subscribe( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| doc: DocId, |
| pos: u32, |
| term: <span class="kw-2">&</span>Term, |
| ctx: <span class="kw-2">&mut </span>IndexingContext, |
| ) -> UnorderedTermId; |
| |
| <span class="doccomment">/// Serializes the postings on disk. |
| /// The actual serialization format is handled by the `PostingsSerializer`. |
| </span><span class="kw">fn </span>serialize( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| term_addrs: <span class="kw-2">&</span>[(Term<<span class="kw-2">&</span>[u8]>, Addr, UnorderedTermId)], |
| doc_id_map: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>DocIdMapping>, |
| ctx: <span class="kw-2">&</span>IndexingContext, |
| serializer: <span class="kw-2">&mut </span>FieldSerializer, |
| ) -> io::Result<()>; |
| |
| <span class="doccomment">/// Tokenize a text and subscribe all of its token. |
| </span><span class="kw">fn </span>index_text( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| doc_id: DocId, |
| token_stream: <span class="kw-2">&mut </span><span class="kw">dyn </span>TokenStream, |
| term_buffer: <span class="kw-2">&mut </span>Term, |
| ctx: <span class="kw-2">&mut </span>IndexingContext, |
| indexing_position: <span class="kw-2">&mut </span>IndexingPosition, |
| <span class="kw-2">mut </span>term_id_fast_field_writer_opt: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>MultiValuedFastFieldWriter>, |
| ) { |
| <span class="kw">let </span>end_of_path_idx = term_buffer.len_bytes(); |
| <span class="kw">let </span><span class="kw-2">mut </span>num_tokens = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>end_position = indexing_position.end_position; |
| token_stream.process(<span class="kw-2">&mut </span>|token: <span class="kw-2">&</span>Token| { |
| <span class="comment">// We skip all tokens with a len greater than u16. |
| </span><span class="kw">if </span>token.text.len() > MAX_TOKEN_LEN { |
| <span class="macro">warn!</span>( |
| <span class="string">"A token exceeding MAX_TOKEN_LEN ({}>{}) was dropped. Search for \ |
| MAX_TOKEN_LEN in the documentation for more information."</span>, |
| token.text.len(), |
| MAX_TOKEN_LEN |
| ); |
| <span class="kw">return</span>; |
| } |
| term_buffer.truncate_value_bytes(end_of_path_idx); |
| term_buffer.append_bytes(token.text.as_bytes()); |
| <span class="kw">let </span>start_position = indexing_position.end_position + token.position <span class="kw">as </span>u32; |
| end_position = end_position.max(start_position + token.position_length <span class="kw">as </span>u32); |
| <span class="kw">let </span>unordered_term_id = <span class="self">self</span>.subscribe(doc_id, start_position, term_buffer, ctx); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(term_id_fast_field_writer) = term_id_fast_field_writer_opt.as_mut() { |
| term_id_fast_field_writer.add_val(unordered_term_id); |
| } |
| |
| num_tokens += <span class="number">1</span>; |
| }); |
| |
| indexing_position.end_position = end_position + POSITION_GAP; |
| indexing_position.num_tokens += num_tokens; |
| term_buffer.truncate_value_bytes(end_of_path_idx); |
| } |
| |
| <span class="kw">fn </span>total_num_tokens(<span class="kw-2">&</span><span class="self">self</span>) -> u64; |
| } |
| |
| <span class="doccomment">/// The `SpecializedPostingsWriter` is just here to remove dynamic |
| /// dispatch to the recorder information. |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SpecializedPostingsWriter<Rec: Recorder> { |
| total_num_tokens: u64, |
| _recorder_type: PhantomData<Rec>, |
| } |
| |
| <span class="kw">impl</span><Rec: Recorder> From<SpecializedPostingsWriter<Rec>> <span class="kw">for </span>Box<<span class="kw">dyn </span>PostingsWriter> { |
| <span class="kw">fn </span>from( |
| specialized_postings_writer: SpecializedPostingsWriter<Rec>, |
| ) -> Box<<span class="kw">dyn </span>PostingsWriter> { |
| Box::new(specialized_postings_writer) |
| } |
| } |
| |
| <span class="kw">impl</span><Rec: Recorder> SpecializedPostingsWriter<Rec> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>serialize_one_term( |
| term: <span class="kw-2">&</span>Term<<span class="kw-2">&</span>[u8]>, |
| addr: Addr, |
| doc_id_map: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>DocIdMapping>, |
| buffer_lender: <span class="kw-2">&mut </span>BufferLender, |
| ctx: <span class="kw-2">&</span>IndexingContext, |
| serializer: <span class="kw-2">&mut </span>FieldSerializer, |
| ) -> io::Result<()> { |
| <span class="kw">let </span>recorder: Rec = ctx.term_index.read(addr); |
| <span class="kw">let </span>term_doc_freq = recorder.term_doc_freq().unwrap_or(<span class="number">0u32</span>); |
| serializer.new_term(term.value_bytes(), term_doc_freq)<span class="question-mark">?</span>; |
| recorder.serialize(<span class="kw-2">&</span>ctx.arena, doc_id_map, serializer, buffer_lender); |
| serializer.close_term()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><Rec: Recorder> PostingsWriter <span class="kw">for </span>SpecializedPostingsWriter<Rec> { |
| <span class="kw">fn </span>subscribe( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| doc: DocId, |
| position: u32, |
| term: <span class="kw-2">&</span>Term, |
| ctx: <span class="kw-2">&mut </span>IndexingContext, |
| ) -> UnorderedTermId { |
| <span class="macro">debug_assert!</span>(term.as_slice().len() >= <span class="number">4</span>); |
| <span class="self">self</span>.total_num_tokens += <span class="number">1</span>; |
| <span class="kw">let </span>(term_index, arena) = (<span class="kw-2">&mut </span>ctx.term_index, <span class="kw-2">&mut </span>ctx.arena); |
| term_index.mutate_or_create(term.as_slice(), |opt_recorder: <span class="prelude-ty">Option</span><Rec>| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>recorder) = opt_recorder { |
| <span class="kw">let </span>current_doc = recorder.current_doc(); |
| <span class="kw">if </span>current_doc != doc { |
| recorder.close_doc(arena); |
| recorder.new_doc(doc, arena); |
| } |
| recorder.record_position(position, arena); |
| recorder |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>recorder = Rec::default(); |
| recorder.new_doc(doc, arena); |
| recorder.record_position(position, arena); |
| recorder |
| } |
| }) <span class="kw">as </span>UnorderedTermId |
| } |
| |
| <span class="kw">fn </span>serialize( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| term_addrs: <span class="kw-2">&</span>[(Term<<span class="kw-2">&</span>[u8]>, Addr, UnorderedTermId)], |
| doc_id_map: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>DocIdMapping>, |
| ctx: <span class="kw-2">&</span>IndexingContext, |
| serializer: <span class="kw-2">&mut </span>FieldSerializer, |
| ) -> io::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer_lender = BufferLender::default(); |
| <span class="kw">for </span>(term, addr, <span class="kw">_</span>) <span class="kw">in </span>term_addrs { |
| <span class="self">Self</span>::serialize_one_term(term, <span class="kw-2">*</span>addr, doc_id_map, <span class="kw-2">&mut </span>buffer_lender, ctx, serializer)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>total_num_tokens(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.total_num_tokens |
| } |
| } |
| </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> |
