| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `common/rusty_leveldb_sgx/src/memtable.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>memtable.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../rusty_leveldb/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rusty_leveldb/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::cmp::{Cmp, MemtableKeyCmp}; |
| <span class="kw">use </span><span class="kw">crate</span>::key_types::{build_memtable_key, parse_internal_key, parse_memtable_key, ValueType}; |
| <span class="kw">use </span><span class="kw">crate</span>::key_types::{LookupKey, UserKey}; |
| <span class="kw">use </span><span class="kw">crate</span>::skipmap::{SkipMap, SkipMapIter}; |
| <span class="kw">use </span><span class="kw">crate</span>::types::{current_key_val, LdbIterator, SequenceNumber}; |
| |
| <span class="kw">use </span>std::rc::Rc; |
| |
| <span class="kw">use </span>integer_encoding::FixedInt; |
| |
| <span class="doccomment">/// Provides Insert/Get/Iterate, based on the SkipMap implementation. |
| /// MemTable uses MemtableKeys internally, that is, it stores key and value in the [Skipmap] key. |
| </span><span class="kw">pub struct </span>MemTable { |
| map: SkipMap, |
| } |
| |
| <span class="kw">impl </span>MemTable { |
| <span class="doccomment">/// Returns a new MemTable. |
| /// This wraps opt.cmp inside a MemtableKey-specific comparator. |
| </span><span class="kw">pub fn </span>new(cmp: Rc<Box<<span class="kw">dyn </span>Cmp>>) -> MemTable { |
| MemTable::new_raw(Rc::new(Box::new(MemtableKeyCmp(cmp)))) |
| } |
| |
| <span class="doccomment">/// Doesn't wrap the comparator in a MemtableKeyCmp. |
| </span><span class="kw">fn </span>new_raw(cmp: Rc<Box<<span class="kw">dyn </span>Cmp>>) -> MemTable { |
| MemTable { |
| map: SkipMap::new(cmp), |
| } |
| } |
| |
| <span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.map.len() |
| } |
| |
| <span class="kw">pub fn </span>approx_mem_usage(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.map.approx_memory() |
| } |
| |
| <span class="kw">pub fn </span>add<<span class="lifetime">'a</span>>(<span class="kw-2">&mut </span><span class="self">self</span>, seq: SequenceNumber, t: ValueType, key: UserKey<<span class="lifetime">'a</span>>, value: <span class="kw-2">&</span>[u8]) { |
| <span class="self">self</span>.map |
| .insert(build_memtable_key(key, value, t, seq), Vec::new()) |
| } |
| |
| <span class="doccomment">/// get returns the value for the given entry and whether the entry is marked as deleted. This |
| /// is to distinguish between not-found and found-deleted. |
| </span><span class="attribute">#[allow(unused_variables)] |
| </span><span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>LookupKey) -> (<span class="prelude-ty">Option</span><Vec<u8>>, bool) { |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = <span class="self">self</span>.map.iter(); |
| iter.seek(key.memtable_key()); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((foundkey, <span class="kw">_</span>)) = current_key_val(<span class="kw-2">&</span>iter) { |
| <span class="kw">let </span>(fkeylen, fkeyoff, tag, vallen, valoff) = parse_memtable_key(<span class="kw-2">&</span>foundkey); |
| |
| <span class="comment">// Compare user key -- if equal, proceed |
| // We only care about user key equality here |
| </span><span class="kw">if </span>key.user_key() == <span class="kw-2">&</span>foundkey[fkeyoff..fkeyoff + fkeylen] { |
| <span class="kw">if </span>tag & <span class="number">0xff </span>== ValueType::TypeValue <span class="kw">as </span>u64 { |
| <span class="kw">return </span>(<span class="prelude-val">Some</span>(foundkey[valoff..valoff + vallen].to_vec()), <span class="bool-val">false</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>(<span class="prelude-val">None</span>, <span class="bool-val">true</span>); |
| } |
| } |
| } |
| (<span class="prelude-val">None</span>, <span class="bool-val">false</span>) |
| } |
| |
| <span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> MemtableIterator { |
| MemtableIterator { |
| skipmapiter: <span class="self">self</span>.map.iter(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// MemtableIterator is an iterator over a MemTable. It is mostly concerned with converting to and |
| /// from the MemtableKey format used in the inner map; all key-taking or -returning methods deal |
| /// with InternalKeys. |
| /// |
| /// This iterator does not skip deleted entries. |
| </span><span class="kw">pub struct </span>MemtableIterator { |
| skipmapiter: SkipMapIter, |
| } |
| |
| <span class="kw">impl </span>LdbIterator <span class="kw">for </span>MemtableIterator { |
| <span class="kw">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>.skipmapiter.advance() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="self">self</span>.skipmapiter.valid() |
| } |
| <span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.skipmapiter.reset(); |
| } |
| <span class="kw">fn </span>prev(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="comment">// Make sure this is actually needed (skipping deleted values?). |
| </span><span class="kw">let </span>(<span class="kw-2">mut </span>key, <span class="kw-2">mut </span>val) = (<span class="macro">vec!</span>[], <span class="macro">vec!</span>[]); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="self">self</span>.skipmapiter.prev() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">if </span><span class="self">self</span>.skipmapiter.current(<span class="kw-2">&mut </span>key, <span class="kw-2">&mut </span>val) { |
| <span class="kw">let </span>(<span class="kw">_</span>, <span class="kw">_</span>, tag, <span class="kw">_</span>, <span class="kw">_</span>) = parse_memtable_key(<span class="kw-2">&</span>key); |
| |
| <span class="kw">if </span>tag & <span class="number">0xff </span>== ValueType::TypeValue <span class="kw">as </span>u64 { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">continue</span>; |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| } |
| <span class="kw">fn </span>valid(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.skipmapiter.valid() |
| } |
| <span class="doccomment">/// current places the current key (in InternalKey format) and value into the supplied vectors. |
| </span><span class="kw">fn </span>current(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&mut </span>Vec<u8>, val: <span class="kw-2">&mut </span>Vec<u8>) -> bool { |
| <span class="kw">if </span>!<span class="self">self</span>.valid() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.skipmapiter.current(key, val) { |
| <span class="kw">let </span>(keylen, keyoff, <span class="kw">_</span>, vallen, valoff) = parse_memtable_key(<span class="kw-2">&</span>key); |
| val.clear(); |
| val.extend_from_slice(<span class="kw-2">&</span>key[valoff..valoff + vallen]); |
| <span class="comment">// zero-allocation truncation. |
| </span>shift_left(key, keyoff); |
| <span class="comment">// Truncate key to key+tag. |
| </span>key.truncate(keylen + u64::required_space()); |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"should not happen"</span>); |
| } |
| } |
| <span class="doccomment">/// seek takes an InternalKey. |
| </span><span class="kw">fn </span>seek(<span class="kw-2">&mut </span><span class="self">self</span>, to: <span class="kw-2">&</span>[u8]) { |
| <span class="comment">// Assemble the correct memtable key from the supplied InternalKey. |
| </span><span class="kw">let </span>(<span class="kw">_</span>, seq, ukey) = parse_internal_key(to); |
| <span class="self">self</span>.skipmapiter |
| .seek(LookupKey::new(ukey, seq).memtable_key()); |
| } |
| } |
| |
| <span class="doccomment">/// shift_left moves s[mid..] to s[0..s.len()-mid]. The new size is s.len()-mid. |
| </span><span class="kw">fn </span>shift_left(s: <span class="kw-2">&mut </span>Vec<u8>, mid: usize) { |
| <span class="kw">for </span>i <span class="kw">in </span>mid..s.len() { |
| s.swap(i, i - mid); |
| } |
| <span class="kw">let </span>newlen = s.len() - mid; |
| s.truncate(newlen); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| #[allow(unused_variables)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::key_types::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::options; |
| <span class="kw">use </span><span class="kw">crate</span>::test_util::{test_iterator_properties, LdbIteratorIter}; |
| <span class="kw">use </span>teaclave_test_utils::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub fn </span>run_tests() -> bool { |
| <span class="macro">run_tests!</span>( |
| test_shift_left, |
| test_memtable_parse_tag, |
| test_memtable_add, |
| test_memtable_add_get, |
| test_memtable_iterator_init, |
| test_memtable_iterator_seek, |
| test_memtable_iterator_fwd, |
| test_memtable_iterator_reverse, |
| test_memtable_parse_key, |
| test_memtable_iterator_behavior, |
| ) |
| } |
| |
| <span class="kw">fn </span>test_shift_left() { |
| <span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]; |
| shift_left(<span class="kw-2">&mut </span>v, <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]; |
| shift_left(<span class="kw-2">&mut </span>v, <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="number">5</span>]); |
| } |
| |
| <span class="kw">fn </span>get_memtable() -> MemTable { |
| <span class="kw">let </span><span class="kw-2">mut </span>mt = MemTable::new(options::for_test().cmp); |
| <span class="kw">let </span>entries = <span class="macro">vec!</span>[ |
| (ValueType::TypeValue, <span class="number">115</span>, <span class="string">"abc"</span>, <span class="string">"122"</span>), |
| (ValueType::TypeValue, <span class="number">120</span>, <span class="string">"abc"</span>, <span class="string">"123"</span>), |
| (ValueType::TypeValue, <span class="number">121</span>, <span class="string">"abd"</span>, <span class="string">"124"</span>), |
| (ValueType::TypeDeletion, <span class="number">122</span>, <span class="string">"abe"</span>, <span class="string">"125"</span>), |
| (ValueType::TypeValue, <span class="number">123</span>, <span class="string">"abf"</span>, <span class="string">"126"</span>), |
| ]; |
| |
| <span class="kw">for </span>e <span class="kw">in </span>entries.iter() { |
| mt.add(e.<span class="number">1</span>, e.<span class="number">0</span>, e.<span class="number">2</span>.as_bytes(), e.<span class="number">3</span>.as_bytes()); |
| } |
| mt |
| } |
| |
| <span class="kw">fn </span>test_memtable_parse_tag() { |
| <span class="kw">let </span>tag = (<span class="number">12345 </span><< <span class="number">8</span>) | <span class="number">1</span>; |
| <span class="macro">assert_eq!</span>(parse_tag(tag), (ValueType::TypeValue, <span class="number">12345</span>)); |
| } |
| |
| <span class="kw">fn </span>test_memtable_add() { |
| <span class="kw">let </span><span class="kw-2">mut </span>mt = MemTable::new(options::for_test().cmp); |
| mt.add( |
| <span class="number">123</span>, |
| ValueType::TypeValue, |
| <span class="string">"abc"</span>.as_bytes(), |
| <span class="string">"123"</span>.as_bytes(), |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| mt.map.iter().next().unwrap().<span class="number">0</span>, |
| <span class="kw-2">&</span>[<span class="number">11</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">123</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">49</span>, <span class="number">50</span>, <span class="number">51</span>] |
| ); |
| <span class="macro">assert_eq!</span>( |
| mt.iter().next().unwrap().<span class="number">0</span>, |
| <span class="kw-2">&</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">123</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>] |
| ); |
| } |
| |
| <span class="kw">fn </span>test_memtable_add_get() { |
| <span class="kw">let </span>mt = get_memtable(); |
| |
| <span class="comment">// Smaller sequence number doesn't find entry |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(v) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">110</span>)).<span class="number">0 </span>{ |
| <span class="macro">println!</span>(<span class="string">"{:?}"</span>, v); |
| <span class="macro">panic!</span>(<span class="string">"found"</span>); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abf"</span>.as_bytes(), <span class="number">110</span>)).<span class="number">0 </span>{ |
| <span class="macro">println!</span>(<span class="string">"{:?}"</span>, v); |
| <span class="macro">panic!</span>(<span class="string">"found"</span>); |
| } |
| |
| <span class="comment">// Bigger sequence number falls back to next smaller |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(v) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">116</span>)).<span class="number">0 </span>{ |
| <span class="macro">assert_eq!</span>(v, <span class="string">"122"</span>.as_bytes()); |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"not found"</span>); |
| } |
| |
| <span class="comment">// Exact match works |
| </span><span class="kw">if let </span>(<span class="prelude-val">Some</span>(v), deleted) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">120</span>)) { |
| <span class="macro">assert_eq!</span>(v, <span class="string">"123"</span>.as_bytes()); |
| <span class="macro">assert!</span>(!deleted); |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"not found"</span>); |
| } |
| |
| <span class="kw">if let </span>(<span class="prelude-val">None</span>, deleted) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abe"</span>.as_bytes(), <span class="number">122</span>)) { |
| <span class="macro">assert!</span>(deleted); |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"found deleted"</span>); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = mt.get(<span class="kw-2">&</span>LookupKey::new(<span class="string">"abf"</span>.as_bytes(), <span class="number">129</span>)).<span class="number">0 </span>{ |
| <span class="macro">assert_eq!</span>(v, <span class="string">"126"</span>.as_bytes()); |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"not found"</span>); |
| } |
| } |
| |
| <span class="kw">fn </span>test_memtable_iterator_init() { |
| <span class="kw">let </span>mt = get_memtable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = mt.iter(); |
| |
| <span class="macro">assert!</span>(!iter.valid()); |
| iter.next(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">120</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| iter.reset(); |
| <span class="macro">assert!</span>(!iter.valid()); |
| } |
| |
| <span class="kw">fn </span>test_memtable_iterator_seek() { |
| <span class="kw">let </span>mt = get_memtable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = mt.iter(); |
| |
| <span class="macro">assert!</span>(!iter.valid()); |
| |
| iter.seek(LookupKey::new(<span class="string">"abc"</span>.as_bytes(), <span class="number">400</span>).internal_key()); |
| <span class="kw">let </span>(<span class="kw-2">mut </span>gotkey, gotval) = current_key_val(<span class="kw-2">&</span>iter).unwrap(); |
| truncate_to_userkey(<span class="kw-2">&mut </span>gotkey); |
| <span class="macro">assert_eq!</span>( |
| (<span class="string">"abc"</span>.as_bytes(), <span class="string">"123"</span>.as_bytes()), |
| (gotkey.as_slice(), gotval.as_slice()) |
| ); |
| |
| iter.seek(LookupKey::new(<span class="string">"xxx"</span>.as_bytes(), <span class="number">400</span>).internal_key()); |
| <span class="macro">assert!</span>(!iter.valid()); |
| |
| iter.seek(LookupKey::new(<span class="string">"abd"</span>.as_bytes(), <span class="number">400</span>).internal_key()); |
| <span class="kw">let </span>(<span class="kw-2">mut </span>gotkey, gotval) = current_key_val(<span class="kw-2">&</span>iter).unwrap(); |
| truncate_to_userkey(<span class="kw-2">&mut </span>gotkey); |
| <span class="macro">assert_eq!</span>( |
| (<span class="string">"abd"</span>.as_bytes(), <span class="string">"124"</span>.as_bytes()), |
| (gotkey.as_slice(), gotval.as_slice()) |
| ); |
| } |
| |
| <span class="kw">fn </span>test_memtable_iterator_fwd() { |
| <span class="kw">let </span>mt = get_memtable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = mt.iter(); |
| |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[ |
| <span class="string">"123"</span>.as_bytes(), <span class="comment">/* i.e., the abc entry with |
| * higher sequence number comes first */ |
| </span><span class="string">"122"</span>.as_bytes(), |
| <span class="string">"124"</span>.as_bytes(), |
| <span class="comment">// deleted entry: |
| </span><span class="string">"125"</span>.as_bytes(), |
| <span class="string">"126"</span>.as_bytes(), |
| ]; |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| |
| <span class="kw">for </span>(k, v) <span class="kw">in </span>LdbIteratorIter::wrap(<span class="kw-2">&mut </span>iter) { |
| <span class="macro">assert_eq!</span>(v, expected[i]); |
| i += <span class="number">1</span>; |
| } |
| } |
| |
| <span class="kw">fn </span>test_memtable_iterator_reverse() { |
| <span class="kw">let </span>mt = get_memtable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = mt.iter(); |
| |
| <span class="comment">// Bigger sequence number comes first |
| </span>iter.next(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">120</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| |
| iter.next(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">115</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| |
| iter.next(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">100</span>, <span class="number">1</span>, <span class="number">121</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| |
| iter.prev(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">115</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| |
| iter.prev(); |
| <span class="macro">assert!</span>(iter.valid()); |
| <span class="macro">assert_eq!</span>( |
| current_key_val(<span class="kw-2">&</span>iter).unwrap().<span class="number">0</span>, |
| <span class="macro">vec!</span>[<span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">120</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| |
| iter.prev(); |
| <span class="macro">assert!</span>(!iter.valid()); |
| } |
| |
| <span class="kw">fn </span>test_memtable_parse_key() { |
| <span class="kw">let </span>key = <span class="macro">vec!</span>[<span class="number">11</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">1</span>, <span class="number">123</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]; |
| <span class="kw">let </span>(keylen, keyoff, tag, vallen, valoff) = parse_memtable_key(<span class="kw-2">&</span>key); |
| <span class="macro">assert_eq!</span>(keylen, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>key[keyoff..keyoff + keylen], <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].as_slice()); |
| <span class="macro">assert_eq!</span>(tag, <span class="number">123 </span><< <span class="number">8 </span>| <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(vallen, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>key[valoff..valoff + vallen], <span class="macro">vec!</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>].as_slice()); |
| } |
| |
| <span class="kw">fn </span>test_memtable_iterator_behavior() { |
| <span class="kw">let </span><span class="kw-2">mut </span>mt = MemTable::new(options::for_test().cmp); |
| <span class="kw">let </span>entries = <span class="macro">vec!</span>[ |
| (<span class="number">115</span>, <span class="string">"abc"</span>, <span class="string">"122"</span>), |
| (<span class="number">120</span>, <span class="string">"abd"</span>, <span class="string">"123"</span>), |
| (<span class="number">121</span>, <span class="string">"abe"</span>, <span class="string">"124"</span>), |
| (<span class="number">123</span>, <span class="string">"abf"</span>, <span class="string">"126"</span>), |
| ]; |
| |
| <span class="kw">for </span>e <span class="kw">in </span>entries.iter() { |
| mt.add(e.<span class="number">0</span>, ValueType::TypeValue, e.<span class="number">1</span>.as_bytes(), e.<span class="number">2</span>.as_bytes()); |
| } |
| |
| test_iterator_properties(mt.iter()); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rusty_leveldb" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
