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| </pre><pre class="rust"><code><span class="kw">use </span>std::ops::DerefMut; |
| <span class="kw">use </span>std::sync::{Arc, RwLock, Weak}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::operation::DeleteOperation; |
| <span class="kw">use </span><span class="kw">crate</span>::Opstamp; |
| |
| <span class="comment">// The DeleteQueue is similar in conceptually to a multiple |
| // consumer single producer broadcast channel. |
| // |
| // All consumer will receive all messages. |
| // |
| // Consumer of the delete queue are holding a `DeleteCursor`, |
| // which points to a specific place of the `DeleteQueue`. |
| // |
| // New consumer can be created in two ways |
| // - calling `delete_queue.cursor()` returns a cursor, that will include all future delete operation |
| // (and some or none of the past operations... The client is in charge of checking the opstamps.). |
| // - cloning an existing cursor returns a new cursor, that is at the exact same position, and can |
| // now advance independently from the original cursor. |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">struct </span>InnerDeleteQueue { |
| writer: Vec<DeleteOperation>, |
| last_block: Weak<Block>, |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>DeleteQueue { |
| inner: Arc<RwLock<InnerDeleteQueue>>, |
| } |
| |
| <span class="kw">impl </span>DeleteQueue { |
| <span class="comment">// Creates a new delete queue. |
| </span><span class="kw">pub fn </span>new() -> DeleteQueue { |
| DeleteQueue { |
| inner: Arc::default(), |
| } |
| } |
| |
| <span class="kw">fn </span>get_last_block(<span class="kw-2">&</span><span class="self">self</span>) -> Arc<Block> { |
| { |
| <span class="comment">// try get the last block with simply acquiring the read lock. |
| </span><span class="kw">let </span>rlock = <span class="self">self</span>.inner.read().unwrap(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(block) = rlock.last_block.upgrade() { |
| <span class="kw">return </span>block; |
| } |
| } |
| <span class="comment">// It failed. Let's double check after acquiring the write, as someone could have called |
| // `get_last_block` right after we released the rlock. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>wlock = <span class="self">self</span>.inner.write().unwrap(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(block) = wlock.last_block.upgrade() { |
| <span class="kw">return </span>block; |
| } |
| <span class="kw">let </span>block = Arc::new(Block { |
| operations: Arc::new([]), |
| next: NextBlock::from(<span class="self">self</span>.clone()), |
| }); |
| wlock.last_block = Arc::downgrade(<span class="kw-2">&</span>block); |
| block |
| } |
| |
| <span class="comment">// Creates a new cursor that makes it possible to |
| // consume future delete operations. |
| // |
| // Past delete operations are not accessible. |
| </span><span class="kw">pub fn </span>cursor(<span class="kw-2">&</span><span class="self">self</span>) -> DeleteCursor { |
| <span class="kw">let </span>last_block = <span class="self">self</span>.get_last_block(); |
| <span class="kw">let </span>operations_len = last_block.operations.len(); |
| DeleteCursor { |
| block: last_block, |
| pos: operations_len, |
| } |
| } |
| |
| <span class="comment">// Appends a new delete operations. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&</span><span class="self">self</span>, delete_operation: DeleteOperation) { |
| <span class="self">self</span>.inner |
| .write() |
| .expect(<span class="string">"Failed to acquire write lock on delete queue writer"</span>) |
| .writer |
| .push(delete_operation); |
| } |
| |
| <span class="comment">// DeleteQueue is a linked list of blocks of |
| // delete operations. |
| // |
| // Writing happens by simply appending to a vec. |
| // `.flush()` takes this pending delete operations vec |
| // creates a new read-only block from it, |
| // and appends it to the linked list. |
| // |
| // `.flush()` happens when, for instance, |
| // a consumer reaches the last read-only operations. |
| // It then ask the delete queue if there happen to |
| // be some unflushed operations. |
| // |
| </span><span class="kw">fn </span>flush(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Arc<Block>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>self_wlock = <span class="self">self |
| </span>.inner |
| .write() |
| .expect(<span class="string">"Failed to acquire write lock on delete queue writer"</span>); |
| |
| <span class="kw">if </span>self_wlock.writer.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>delete_operations = std::mem::take(<span class="kw-2">&mut </span>self_wlock.writer); |
| |
| <span class="kw">let </span>new_block = Arc::new(Block { |
| operations: Arc::from(delete_operations.into_boxed_slice()), |
| next: NextBlock::from(<span class="self">self</span>.clone()), |
| }); |
| |
| self_wlock.last_block = Arc::downgrade(<span class="kw-2">&</span>new_block); |
| <span class="prelude-val">Some</span>(new_block) |
| } |
| } |
| |
| <span class="kw">enum </span>InnerNextBlock { |
| Writer(DeleteQueue), |
| Closed(Arc<Block>), |
| } |
| |
| <span class="kw">struct </span>NextBlock(RwLock<InnerNextBlock>); |
| |
| <span class="kw">impl </span>From<DeleteQueue> <span class="kw">for </span>NextBlock { |
| <span class="kw">fn </span>from(delete_queue: DeleteQueue) -> NextBlock { |
| NextBlock(RwLock::new(InnerNextBlock::Writer(delete_queue))) |
| } |
| } |
| |
| <span class="kw">impl </span>NextBlock { |
| <span class="kw">fn </span>next_block(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Arc<Block>> { |
| { |
| <span class="kw">let </span>next_read_lock = <span class="self">self |
| </span>.<span class="number">0 |
| </span>.read() |
| .expect(<span class="string">"Failed to acquire write lock in delete queue"</span>); |
| <span class="kw">if let </span>InnerNextBlock::Closed(<span class="kw-2">ref </span>block) = <span class="kw-2">*</span>next_read_lock { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Arc::clone(block)); |
| } |
| } |
| <span class="kw">let </span>next_block; |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>next_write_lock = <span class="self">self |
| </span>.<span class="number">0 |
| </span>.write() |
| .expect(<span class="string">"Failed to acquire write lock in delete queue"</span>); |
| <span class="kw">match </span><span class="kw-2">*</span>next_write_lock { |
| InnerNextBlock::Closed(<span class="kw-2">ref </span>block) => { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Arc::clone(block)); |
| } |
| InnerNextBlock::Writer(<span class="kw-2">ref </span>writer) => <span class="kw">match </span>writer.flush() { |
| <span class="prelude-val">Some</span>(flushed_next_block) => { |
| next_block = flushed_next_block; |
| } |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| }, |
| } |
| <span class="kw-2">*</span>next_write_lock.deref_mut() = InnerNextBlock::Closed(Arc::clone(<span class="kw-2">&</span>next_block)); |
| <span class="prelude-val">Some</span>(next_block) |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>Block { |
| operations: Arc<[DeleteOperation]>, |
| next: NextBlock, |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>DeleteCursor { |
| block: Arc<Block>, |
| pos: usize, |
| } |
| |
| <span class="kw">impl </span>DeleteCursor { |
| <span class="doccomment">/// Skips operations and position it so that |
| /// - either all of the delete operation currently in the queue are consume and the next get |
| /// will return `None`. |
| /// - the next get will return the first operation with an |
| /// `opstamp >= target_opstamp`. |
| </span><span class="kw">pub fn </span>skip_to(<span class="kw-2">&mut </span><span class="self">self</span>, target_opstamp: Opstamp) { |
| <span class="comment">// TODO Can be optimize as we work with block. |
| </span><span class="kw">while </span><span class="self">self</span>.is_behind_opstamp(target_opstamp) { |
| <span class="self">self</span>.advance(); |
| } |
| } |
| |
| <span class="attribute">#[allow(clippy::wrong_self_convention)] |
| </span><span class="kw">fn </span>is_behind_opstamp(<span class="kw-2">&mut </span><span class="self">self</span>, target_opstamp: Opstamp) -> bool { |
| <span class="self">self</span>.get() |
| .map(|operation| operation.opstamp < target_opstamp) |
| .unwrap_or(<span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// If the current block has been entirely |
| /// consumed, try to load the next one. |
| /// |
| /// Return `true`, if after this attempt, |
| /// the cursor is on a block that has not |
| /// been entirely consumed. |
| /// Return `false`, if we have reached the end of the queue. |
| </span><span class="kw">fn </span>load_block_if_required(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.pos >= <span class="self">self</span>.block.operations.len() { |
| <span class="comment">// we have consumed our operations entirely. |
| // let's ask our writer if he has more for us. |
| // self.go_next_block(); |
| </span><span class="kw">match </span><span class="self">self</span>.block.next.next_block() { |
| <span class="prelude-val">Some</span>(block) => { |
| <span class="self">self</span>.block = block; |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| <span class="bool-val">true |
| </span>} |
| <span class="prelude-val">None </span>=> <span class="bool-val">false</span>, |
| } |
| } <span class="kw">else </span>{ |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="doccomment">/// Advance to the next delete operation. |
| /// Returns true if and only if there is such an operation. |
| </span><span class="kw">pub fn </span>advance(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.load_block_if_required() { |
| <span class="self">self</span>.pos += <span class="number">1</span>; |
| <span class="bool-val">true |
| </span>} <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="doccomment">/// Get the current delete operation. |
| /// Calling `.get` does not advance the cursor. |
| </span><span class="kw">pub fn </span>get(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>DeleteOperation> { |
| <span class="kw">if </span><span class="self">self</span>.load_block_if_required() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.block.operations[<span class="self">self</span>.pos]) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| |
| <span class="kw">use super</span>::{DeleteOperation, DeleteQueue}; |
| <span class="kw">use </span><span class="kw">crate</span>::query::{Explanation, Scorer, Weight}; |
| <span class="kw">use crate</span>::{DocId, Score, SegmentReader}; |
| |
| <span class="kw">struct </span>DummyWeight; |
| <span class="kw">impl </span>Weight <span class="kw">for </span>DummyWeight { |
| <span class="kw">fn </span>scorer(<span class="kw-2">&</span><span class="self">self</span>, _reader: <span class="kw-2">&</span>SegmentReader, _boost: Score) -> <span class="kw">crate</span>::Result<Box<<span class="kw">dyn </span>Scorer>> { |
| <span class="prelude-val">Err</span>(<span class="kw">crate</span>::TantivyError::InternalError(<span class="string">"dummy impl"</span>.to_owned())) |
| } |
| |
| <span class="kw">fn </span>explain(<span class="kw-2">&</span><span class="self">self</span>, _reader: <span class="kw-2">&</span>SegmentReader, _doc: DocId) -> <span class="kw">crate</span>::Result<Explanation> { |
| <span class="prelude-val">Err</span>(<span class="kw">crate</span>::TantivyError::InternalError(<span class="string">"dummy impl"</span>.to_owned())) |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_deletequeue() { |
| <span class="kw">let </span>delete_queue = DeleteQueue::new(); |
| |
| <span class="kw">let </span>make_op = |i: usize| DeleteOperation { |
| opstamp: i <span class="kw">as </span>u64, |
| target: Box::new(DummyWeight), |
| }; |
| |
| delete_queue.push(make_op(<span class="number">1</span>)); |
| delete_queue.push(make_op(<span class="number">2</span>)); |
| |
| <span class="kw">let </span>snapshot = delete_queue.cursor(); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>operations_it = snapshot.clone(); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">1</span>); |
| operations_it.advance(); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">2</span>); |
| operations_it.advance(); |
| <span class="macro">assert!</span>(operations_it.get().is_none()); |
| operations_it.advance(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>snapshot2 = delete_queue.cursor(); |
| <span class="macro">assert!</span>(snapshot2.get().is_none()); |
| delete_queue.push(make_op(<span class="number">3</span>)); |
| <span class="macro">assert_eq!</span>(snapshot2.get().unwrap().opstamp, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">3</span>); |
| operations_it.advance(); |
| <span class="macro">assert!</span>(operations_it.get().is_none()); |
| operations_it.advance(); |
| } |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>operations_it = snapshot; |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">1</span>); |
| operations_it.advance(); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">2</span>); |
| operations_it.advance(); |
| <span class="macro">assert_eq!</span>(operations_it.get().unwrap().opstamp, <span class="number">3</span>); |
| operations_it.advance(); |
| <span class="macro">assert!</span>(operations_it.get().is_none()); |
| } |
| } |
| } |
| </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> |