fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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128 lines
3.6 KiB
128 lines
3.6 KiB
// Copyright (c) 2012 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "table/filter_block.h"
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#include "leveldb/filter_policy.h"
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#include "util/coding.h"
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#include "util/hash.h"
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#include "util/logging.h"
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#include "util/testharness.h"
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#include "util/testutil.h"
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namespace leveldb {
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// For testing: emit an array with one hash value per key
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class TestHashFilter : public FilterPolicy {
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public:
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virtual const char* Name() const {
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return "TestHashFilter";
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}
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virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const {
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for (int i = 0; i < n; i++) {
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uint32_t h = Hash(keys[i].data(), keys[i].size(), 1);
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PutFixed32(dst, h);
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}
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}
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virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const {
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uint32_t h = Hash(key.data(), key.size(), 1);
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for (int i = 0; i + 4 <= filter.size(); i += 4) {
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if (h == DecodeFixed32(filter.data() + i)) {
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return true;
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}
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}
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return false;
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}
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};
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class FilterBlockTest {
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public:
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TestHashFilter policy_;
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};
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TEST(FilterBlockTest, EmptyBuilder) {
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FilterBlockBuilder builder(&policy_);
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Slice block = builder.Finish();
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ASSERT_EQ("\\x00\\x00\\x00\\x00\\x0b", EscapeString(block));
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FilterBlockReader reader(&policy_, block);
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ASSERT_TRUE(reader.KeyMayMatch(0, "foo"));
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ASSERT_TRUE(reader.KeyMayMatch(100000, "foo"));
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}
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TEST(FilterBlockTest, SingleChunk) {
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FilterBlockBuilder builder(&policy_);
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builder.StartBlock(100);
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builder.AddKey("foo");
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builder.AddKey("bar");
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builder.AddKey("box");
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builder.StartBlock(200);
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builder.AddKey("box");
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builder.StartBlock(300);
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builder.AddKey("hello");
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Slice block = builder.Finish();
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FilterBlockReader reader(&policy_, block);
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ASSERT_TRUE(reader.KeyMayMatch(100, "foo"));
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ASSERT_TRUE(reader.KeyMayMatch(100, "bar"));
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ASSERT_TRUE(reader.KeyMayMatch(100, "box"));
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ASSERT_TRUE(reader.KeyMayMatch(100, "hello"));
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ASSERT_TRUE(reader.KeyMayMatch(100, "foo"));
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ASSERT_TRUE(! reader.KeyMayMatch(100, "missing"));
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ASSERT_TRUE(! reader.KeyMayMatch(100, "other"));
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}
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TEST(FilterBlockTest, MultiChunk) {
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FilterBlockBuilder builder(&policy_);
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// First filter
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builder.StartBlock(0);
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builder.AddKey("foo");
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builder.StartBlock(2000);
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builder.AddKey("bar");
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// Second filter
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builder.StartBlock(3100);
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builder.AddKey("box");
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// Third filter is empty
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// Last filter
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builder.StartBlock(9000);
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builder.AddKey("box");
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builder.AddKey("hello");
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Slice block = builder.Finish();
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FilterBlockReader reader(&policy_, block);
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// Check first filter
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ASSERT_TRUE(reader.KeyMayMatch(0, "foo"));
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ASSERT_TRUE(reader.KeyMayMatch(2000, "bar"));
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ASSERT_TRUE(! reader.KeyMayMatch(0, "box"));
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ASSERT_TRUE(! reader.KeyMayMatch(0, "hello"));
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// Check second filter
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ASSERT_TRUE(reader.KeyMayMatch(3100, "box"));
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ASSERT_TRUE(! reader.KeyMayMatch(3100, "foo"));
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ASSERT_TRUE(! reader.KeyMayMatch(3100, "bar"));
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ASSERT_TRUE(! reader.KeyMayMatch(3100, "hello"));
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// Check third filter (empty)
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ASSERT_TRUE(! reader.KeyMayMatch(4100, "foo"));
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ASSERT_TRUE(! reader.KeyMayMatch(4100, "bar"));
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ASSERT_TRUE(! reader.KeyMayMatch(4100, "box"));
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ASSERT_TRUE(! reader.KeyMayMatch(4100, "hello"));
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// Check last filter
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ASSERT_TRUE(reader.KeyMayMatch(9000, "box"));
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ASSERT_TRUE(reader.KeyMayMatch(9000, "hello"));
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ASSERT_TRUE(! reader.KeyMayMatch(9000, "foo"));
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ASSERT_TRUE(! reader.KeyMayMatch(9000, "bar"));
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}
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} // namespace leveldb
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int main(int argc, char** argv) {
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return leveldb::test::RunAllTests();
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}
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