rocksdb/util/dynamic_bloom.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include "dynamic_bloom.h"
#include "rocksdb/slice.h"
#include "util/hash.h"
namespace rocksdb {
namespace {
static uint32_t BloomHash(const Slice& key) {
return Hash(key.data(), key.size(), 0xbc9f1d34);
}
}
DynamicBloom::DynamicBloom(uint32_t total_bits,
uint32_t (*hash_func)(const Slice& key),
uint32_t num_probes)
: hash_func_(hash_func),
kTotalBits((total_bits + 7) / 8 * 8),
kNumProbes(num_probes) {
assert(hash_func_);
assert(kNumProbes > 0);
assert(kTotalBits > 0);
data_.reset(new unsigned char[kTotalBits / 8]());
}
DynamicBloom::DynamicBloom(uint32_t total_bits,
uint32_t num_probes)
: DynamicBloom(total_bits, &BloomHash, num_probes) {
}
} // rocksdb