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