rocksdb/util/sharded_cache.h

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// Copyright (c) 2011-present, 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.
//
// Copyright (c) 2011 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.
#pragma once
#include <atomic>
#include "port/port.h"
#include "rocksdb/cache.h"
#include "util/hash.h"
namespace rocksdb {
// Single cache shard interface.
class CacheShard {
public:
CacheShard() = default;
virtual ~CacheShard() = default;
virtual Status Insert(const Slice& key, uint32_t hash, void* value,
size_t charge,
void (*deleter)(const Slice& key, void* value),
Cache::Handle** handle, Cache::Priority priority) = 0;
virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash) = 0;
virtual void Release(Cache::Handle* handle) = 0;
virtual void Erase(const Slice& key, uint32_t hash) = 0;
virtual void SetCapacity(size_t capacity) = 0;
virtual void SetStrictCapacityLimit(bool strict_capacity_limit) = 0;
virtual size_t GetUsage() const = 0;
virtual size_t GetPinnedUsage() const = 0;
virtual void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
bool thread_safe) = 0;
virtual void EraseUnRefEntries() = 0;
};
// Generic cache interface which shards cache by hash of keys. 2^num_shard_bits
// shards will be created, with capacity split evenly to each of the shards.
// Keys are sharded by the highest num_shard_bits bits of hash value.
class ShardedCache : public Cache {
public:
ShardedCache(size_t capacity, int num_shard_bits, bool strict_capacity_limit);
virtual ~ShardedCache() = default;
virtual const char* Name() const override = 0;
virtual CacheShard* GetShard(int shard) = 0;
virtual const CacheShard* GetShard(int shard) const = 0;
virtual void* Value(Handle* handle) override = 0;
virtual size_t GetCharge(Handle* handle) const = 0;
virtual uint32_t GetHash(Handle* handle) const = 0;
virtual void DisownData() override = 0;
virtual void SetCapacity(size_t capacity) override;
virtual void SetStrictCapacityLimit(bool strict_capacity_limit) override;
virtual Status Insert(const Slice& key, void* value, size_t charge,
void (*deleter)(const Slice& key, void* value),
Handle** handle, Priority priority) override;
virtual Handle* Lookup(const Slice& key, Statistics* stats) override;
virtual void Release(Handle* handle) override;
virtual void Erase(const Slice& key) override;
virtual uint64_t NewId() override;
virtual size_t GetCapacity() const override;
virtual bool HasStrictCapacityLimit() const override;
virtual size_t GetUsage() const override;
virtual size_t GetUsage(Handle* handle) const override;
virtual size_t GetPinnedUsage() const override;
virtual void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
bool thread_safe) override;
virtual void EraseUnRefEntries() override;
private:
static inline uint32_t HashSlice(const Slice& s) {
return Hash(s.data(), s.size(), 0);
}
uint32_t Shard(uint32_t hash) {
// Note, hash >> 32 yields hash in gcc, not the zero we expect!
return (num_shard_bits_ > 0) ? (hash >> (32 - num_shard_bits_)) : 0;
}
int num_shard_bits_;
mutable port::Mutex capacity_mutex_;
size_t capacity_;
bool strict_capacity_limit_;
std::atomic<uint64_t> last_id_;
};
} // namespace rocksdb