abaf26266d
Summary: Some changes to PlainTable format: (1) support variable key length (2) use user defined slice transformer to extract prefixes (3) Run some test cases against PlainTable in db_test and table_test Test Plan: test db_test Reviewers: haobo, kailiu CC: dhruba, igor, leveldb, nkg- Differential Revision: https://reviews.facebook.net/D14457
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include <atomic>
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#include <memory>
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namespace rocksdb {
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class Slice;
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class DynamicBloom {
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public:
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// total_bits: fixed total bits for the bloom
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// hash_func: customized hash function
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// num_probes: number of hash probes for a single key
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DynamicBloom(uint32_t total_bits,
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uint32_t (*hash_func)(const Slice& key),
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uint32_t num_probes = 6);
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explicit DynamicBloom(uint32_t total_bits, uint32_t num_probes = 6);
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// Assuming single threaded access to Add
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void Add(const Slice& key);
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// Assuming single threaded access to Add
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void AddHash(uint32_t hash);
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// Multithreaded access to MayContain is OK
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bool MayContain(const Slice& key);
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// Multithreaded access to MayContain is OK
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bool MayContainHash(uint32_t hash);
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private:
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uint32_t (*hash_func_)(const Slice& key);
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uint32_t total_bits_;
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uint32_t num_probes_;
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std::unique_ptr<unsigned char[]> data_;
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};
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}
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