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 </pre><pre class="rust"><code><span class="kw">use </span>std::io::Write;
 <span class="kw">use </span>std::sync::mpsc::{sync_channel, Receiver, SyncSender};
 <span class="kw">use </span>std::thread::JoinHandle;
 <span class="kw">use </span>std::{io, thread};

 <span class="kw">use </span>common::{BinarySerializable, CountingWriter, TerminatingWrite};

 <span class="kw">use </span><span class="kw">crate</span>::directory::WritePtr;
 <span class="kw">use </span><span class="kw">crate</span>::store::footer::DocStoreFooter;
 <span class="kw">use </span><span class="kw">crate</span>::store::index::{Checkpoint, SkipIndexBuilder};
 <span class="kw">use </span><span class="kw">crate</span>::store::{Compressor, Decompressor, StoreReader};
 <span class="kw">use </span><span class="kw">crate</span>::DocId;

 <span class="kw">pub struct </span>BlockCompressor(BlockCompressorVariants);

 <span class="comment">// The struct wrapping an enum is just here to keep the
 // impls private.
 </span><span class="kw">enum </span>BlockCompressorVariants {
     SameThread(BlockCompressorImpl),
     DedicatedThread(DedicatedThreadBlockCompressorImpl),
 }

 <span class="kw">impl </span>BlockCompressor {
     <span class="kw">pub fn </span>new(compressor: Compressor, wrt: WritePtr, dedicated_thread: bool) -&gt; io::Result&lt;<span class="self">Self</span>&gt; {
         <span class="kw">let </span>block_compressor_impl = BlockCompressorImpl::new(compressor, wrt);
         <span class="kw">if </span>dedicated_thread {
             <span class="kw">let </span>dedicated_thread_compressor =
                 DedicatedThreadBlockCompressorImpl::new(block_compressor_impl)<span class="question-mark">?</span>;
             <span class="prelude-val">Ok</span>(BlockCompressor(BlockCompressorVariants::DedicatedThread(
                 dedicated_thread_compressor,
             )))
         } <span class="kw">else </span>{
             <span class="prelude-val">Ok</span>(BlockCompressor(BlockCompressorVariants::SameThread(
                 block_compressor_impl,
             )))
         }
     }

     <span class="kw">pub fn </span>compress_block_and_write(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         bytes: <span class="kw-2">&amp;</span>[u8],
         num_docs_in_block: u32,
     ) -&gt; io::Result&lt;()&gt; {
         <span class="kw">match </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.<span class="number">0 </span>{
             BlockCompressorVariants::SameThread(block_compressor) =&gt; {
                 block_compressor.compress_block_and_write(bytes, num_docs_in_block)<span class="question-mark">?</span>;
             }
             BlockCompressorVariants::DedicatedThread(different_thread_block_compressor) =&gt; {
                 different_thread_block_compressor
                     .compress_block_and_write(bytes, num_docs_in_block)<span class="question-mark">?</span>;
             }
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>stack_reader(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store_reader: StoreReader) -&gt; io::Result&lt;()&gt; {
         <span class="kw">match </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.<span class="number">0 </span>{
             BlockCompressorVariants::SameThread(block_compressor) =&gt; {
                 block_compressor.stack(store_reader)<span class="question-mark">?</span>;
             }
             BlockCompressorVariants::DedicatedThread(different_thread_block_compressor) =&gt; {
                 different_thread_block_compressor.stack_reader(store_reader)<span class="question-mark">?</span>;
             }
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">pub fn </span>close(<span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>imp = <span class="self">self</span>.<span class="number">0</span>;
         <span class="kw">match </span>imp {
             BlockCompressorVariants::SameThread(block_compressor) =&gt; block_compressor.close(),
             BlockCompressorVariants::DedicatedThread(different_thread_block_compressor) =&gt; {
                 different_thread_block_compressor.close()
             }
         }
     }
 }

 <span class="kw">struct </span>BlockCompressorImpl {
     compressor: Compressor,
     first_doc_in_block: DocId,
     offset_index_writer: SkipIndexBuilder,
     intermediary_buffer: Vec&lt;u8&gt;,
     writer: CountingWriter&lt;WritePtr&gt;,
 }

 <span class="kw">impl </span>BlockCompressorImpl {
     <span class="kw">fn </span>new(compressor: Compressor, writer: WritePtr) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             compressor,
             first_doc_in_block: <span class="number">0</span>,
             offset_index_writer: SkipIndexBuilder::new(),
             intermediary_buffer: Vec::new(),
             writer: CountingWriter::wrap(writer),
         }
     }

     <span class="kw">fn </span>compress_block_and_write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8], num_docs_in_block: u32) -&gt; io::Result&lt;()&gt; {
         <span class="macro">assert!</span>(num_docs_in_block &gt; <span class="number">0</span>);
         <span class="self">self</span>.intermediary_buffer.clear();
         <span class="self">self</span>.compressor
             .compress_into(data, <span class="kw-2">&amp;mut </span><span class="self">self</span>.intermediary_buffer)<span class="question-mark">?</span>;

         <span class="kw">let </span>start_offset = <span class="self">self</span>.writer.written_bytes() <span class="kw">as </span>usize;
         <span class="self">self</span>.writer.write_all(<span class="kw-2">&amp;</span><span class="self">self</span>.intermediary_buffer)<span class="question-mark">?</span>;
         <span class="kw">let </span>end_offset = <span class="self">self</span>.writer.written_bytes() <span class="kw">as </span>usize;

         <span class="self">self</span>.register_checkpoint(Checkpoint {
             doc_range: <span class="self">self</span>.first_doc_in_block..<span class="self">self</span>.first_doc_in_block + num_docs_in_block,
             byte_range: start_offset..end_offset,
         });
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>register_checkpoint(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: Checkpoint) {
         <span class="self">self</span>.offset_index_writer.insert(checkpoint.clone());
         <span class="self">self</span>.first_doc_in_block = checkpoint.doc_range.end;
     }

     <span class="doccomment">/// Stacks a store reader on top of the documents written so far.
     /// This method is an optimization compared to iterating over the documents
     /// in the store and adding them one by one, as the store&#39;s data will
     /// not be decompressed and then recompressed.
     </span><span class="kw">fn </span>stack(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store_reader: StoreReader) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>doc_shift = <span class="self">self</span>.first_doc_in_block;
         <span class="kw">let </span>start_shift = <span class="self">self</span>.writer.written_bytes() <span class="kw">as </span>usize;

         <span class="comment">// just bulk write all of the block of the given reader.
         </span><span class="self">self</span>.writer
             .write_all(store_reader.block_data()<span class="question-mark">?</span>.as_slice())<span class="question-mark">?</span>;

         <span class="comment">// concatenate the index of the `store_reader`, after translating
         // its start doc id and its start file offset.
         </span><span class="kw">for </span><span class="kw-2">mut </span>checkpoint <span class="kw">in </span>store_reader.block_checkpoints() {
             checkpoint.doc_range.start += doc_shift;
             checkpoint.doc_range.end += doc_shift;
             checkpoint.byte_range.start += start_shift;
             checkpoint.byte_range.end += start_shift;
             <span class="self">self</span>.register_checkpoint(checkpoint);
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>close(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>header_offset: u64 = <span class="self">self</span>.writer.written_bytes() <span class="kw">as </span>u64;
         <span class="kw">let </span>docstore_footer =
             DocStoreFooter::new(header_offset, Decompressor::from(<span class="self">self</span>.compressor));
         <span class="self">self</span>.offset_index_writer.serialize_into(<span class="kw-2">&amp;mut </span><span class="self">self</span>.writer)<span class="question-mark">?</span>;
         docstore_footer.serialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.writer)<span class="question-mark">?</span>;
         <span class="self">self</span>.writer.terminate()
     }
 }

 <span class="comment">// ---------------------------------
 </span><span class="kw">enum </span>BlockCompressorMessage {
     CompressBlockAndWrite {
         block_data: Vec&lt;u8&gt;,
         num_docs_in_block: u32,
     },
     Stack(StoreReader),
 }

 <span class="kw">struct </span>DedicatedThreadBlockCompressorImpl {
     join_handle: <span class="prelude-ty">Option</span>&lt;JoinHandle&lt;io::Result&lt;()&gt;&gt;&gt;,
     tx: SyncSender&lt;BlockCompressorMessage&gt;,
 }

 <span class="kw">impl </span>DedicatedThreadBlockCompressorImpl {
     <span class="kw">fn </span>new(<span class="kw-2">mut </span>block_compressor: BlockCompressorImpl) -&gt; io::Result&lt;<span class="self">Self</span>&gt; {
         <span class="kw">let </span>(tx, rx): (
             SyncSender&lt;BlockCompressorMessage&gt;,
             Receiver&lt;BlockCompressorMessage&gt;,
         ) = sync_channel(<span class="number">3</span>);
         <span class="kw">let </span>join_handle = thread::Builder::new()
             .name(<span class="string">&quot;docstore-compressor-thread&quot;</span>.to_string())
             .spawn(<span class="kw">move </span>|| {
                 <span class="kw">while let </span><span class="prelude-val">Ok</span>(packet) = rx.recv() {
                     <span class="kw">match </span>packet {
                         BlockCompressorMessage::CompressBlockAndWrite {
                             block_data,
                             num_docs_in_block,
                         } =&gt; {
                             block_compressor
                                 .compress_block_and_write(<span class="kw-2">&amp;</span>block_data[..], num_docs_in_block)<span class="question-mark">?</span>;
                         }
                         BlockCompressorMessage::Stack(store_reader) =&gt; {
                             block_compressor.stack(store_reader)<span class="question-mark">?</span>;
                         }
                     }
                 }
                 block_compressor.close()<span class="question-mark">?</span>;
                 <span class="prelude-val">Ok</span>(())
             })<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(DedicatedThreadBlockCompressorImpl {
             join_handle: <span class="prelude-val">Some</span>(join_handle),
             tx,
         })
     }

     <span class="kw">fn </span>compress_block_and_write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8], num_docs_in_block: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.send(BlockCompressorMessage::CompressBlockAndWrite {
             block_data: bytes.to_vec(),
             num_docs_in_block,
         })
     }

     <span class="kw">fn </span>stack_reader(<span class="kw-2">&amp;mut </span><span class="self">self</span>, store_reader: StoreReader) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.send(BlockCompressorMessage::Stack(store_reader))
     }

     <span class="kw">fn </span>send(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: BlockCompressorMessage) -&gt; io::Result&lt;()&gt; {
         <span class="kw">if </span><span class="self">self</span>.tx.send(msg).is_err() {
             harvest_thread_result(<span class="self">self</span>.join_handle.take())<span class="question-mark">?</span>;
             <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::new(io::ErrorKind::Other, <span class="string">&quot;Unidentified error.&quot;</span>));
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>close(<span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
         drop(<span class="self">self</span>.tx);
         harvest_thread_result(<span class="self">self</span>.join_handle)
     }
 }

 <span class="doccomment">/// Wait for the thread result to terminate and returns its result.
 ///
 /// If the thread panicked, or if the result has already been harvested,
 /// returns an explicit error.
 </span><span class="kw">fn </span>harvest_thread_result(join_handle_opt: <span class="prelude-ty">Option</span>&lt;JoinHandle&lt;io::Result&lt;()&gt;&gt;&gt;) -&gt; io::Result&lt;()&gt; {
     <span class="kw">let </span>join_handle = join_handle_opt
         .ok_or_else(|| io::Error::new(io::ErrorKind::Other, <span class="string">&quot;Thread already joined.&quot;</span>))<span class="question-mark">?</span>;
     join_handle
         .join()
         .map_err(|_err| io::Error::new(io::ErrorKind::Other, <span class="string">&quot;Compressing thread panicked.&quot;</span>))<span class="question-mark">?
 </span>}

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span>std::io;
     <span class="kw">use </span>std::path::Path;

     <span class="kw">use </span><span class="kw">crate</span>::directory::RamDirectory;
     <span class="kw">use </span><span class="kw">crate</span>::store::store_compressor::BlockCompressor;
     <span class="kw">use </span><span class="kw">crate</span>::store::Compressor;
     <span class="kw">use </span><span class="kw">crate</span>::Directory;

     <span class="kw">fn </span>populate_block_compressor(<span class="kw-2">mut </span>block_compressor: BlockCompressor) -&gt; io::Result&lt;()&gt; {
         block_compressor.compress_block_and_write(<span class="string">b&quot;hello&quot;</span>, <span class="number">1</span>)<span class="question-mark">?</span>;
         block_compressor.compress_block_and_write(<span class="string">b&quot;happy&quot;</span>, <span class="number">1</span>)<span class="question-mark">?</span>;
         block_compressor.close()<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_block_store_compressor_impls_yield_the_same_result() {
         <span class="kw">let </span>ram_directory = RamDirectory::default();
         <span class="kw">let </span>path1 = Path::new(<span class="string">&quot;path1&quot;</span>);
         <span class="kw">let </span>path2 = Path::new(<span class="string">&quot;path2&quot;</span>);
         <span class="kw">let </span>wrt1 = ram_directory.open_write(path1).unwrap();
         <span class="kw">let </span>wrt2 = ram_directory.open_write(path2).unwrap();
         <span class="kw">let </span>block_compressor1 = BlockCompressor::new(Compressor::None, wrt1, <span class="bool-val">true</span>).unwrap();
         <span class="kw">let </span>block_compressor2 = BlockCompressor::new(Compressor::None, wrt2, <span class="bool-val">false</span>).unwrap();
         populate_block_compressor(block_compressor1).unwrap();
         populate_block_compressor(block_compressor2).unwrap();
         <span class="kw">let </span>data1 = ram_directory.open_read(path1).unwrap();
         <span class="kw">let </span>data2 = ram_directory.open_read(path2).unwrap();
         <span class="macro">assert_eq!</span>(data1.read_bytes().unwrap(), data2.read_bytes().unwrap());
     }
 }
 </code></pre></div>
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