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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root 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.
#include "rocksdb/cache.h"
#include "cache/lru_cache.h"
#include "rocksdb/secondary_cache.h"
#include "rocksdb/utilities/customizable_util.h"
#include "rocksdb/utilities/options_type.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
const Cache::CacheItemHelper kNoopCacheItemHelper{};
static std::unordered_map<std::string, OptionTypeInfo>
lru_cache_options_type_info = {
{"capacity",
{offsetof(struct LRUCacheOptions, capacity), OptionType::kSizeT,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"num_shard_bits",
{offsetof(struct LRUCacheOptions, num_shard_bits), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"strict_capacity_limit",
{offsetof(struct LRUCacheOptions, strict_capacity_limit),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"high_pri_pool_ratio",
{offsetof(struct LRUCacheOptions, high_pri_pool_ratio),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"low_pri_pool_ratio",
{offsetof(struct LRUCacheOptions, low_pri_pool_ratio),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
};
static std::unordered_map<std::string, OptionTypeInfo>
comp_sec_cache_options_type_info = {
{"capacity",
{offsetof(struct CompressedSecondaryCacheOptions, capacity),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"num_shard_bits",
{offsetof(struct CompressedSecondaryCacheOptions, num_shard_bits),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"compression_type",
{offsetof(struct CompressedSecondaryCacheOptions, compression_type),
OptionType::kCompressionType, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"compress_format_version",
{offsetof(struct CompressedSecondaryCacheOptions,
compress_format_version),
OptionType::kUInt32T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"enable_custom_split_merge",
{offsetof(struct CompressedSecondaryCacheOptions,
enable_custom_split_merge),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
};
namespace {
static void NoopDelete(Cache::ObjectPtr /*obj*/,
MemoryAllocator* /*allocator*/) {
assert(false);
}
static size_t SliceSize(Cache::ObjectPtr obj) {
return static_cast<Slice*>(obj)->size();
}
static Status SliceSaveTo(Cache::ObjectPtr from_obj, size_t from_offset,
size_t length, char* out) {
const Slice& slice = *static_cast<Slice*>(from_obj);
std::memcpy(out, slice.data() + from_offset, length);
return Status::OK();
}
static Status NoopCreate(const Slice& /*data*/, CompressionType /*type*/,
CacheTier /*source*/, Cache::CreateContext* /*ctx*/,
MemoryAllocator* /*allocator*/,
Cache::ObjectPtr* /*out_obj*/,
size_t* /*out_charge*/) {
assert(false);
return Status::NotSupported();
}
static Cache::CacheItemHelper kBasicCacheItemHelper(CacheEntryRole::kMisc,
&NoopDelete);
} // namespace
const Cache::CacheItemHelper kSliceCacheItemHelper{
CacheEntryRole::kMisc, &NoopDelete, &SliceSize,
&SliceSaveTo, &NoopCreate, &kBasicCacheItemHelper,
};
Status SecondaryCache::CreateFromString(
const ConfigOptions& config_options, const std::string& value,
std::shared_ptr<SecondaryCache>* result) {
if (value.find("compressed_secondary_cache://") == 0) {
std::string args = value;
args.erase(0, std::strlen("compressed_secondary_cache://"));
Status status;
std::shared_ptr<SecondaryCache> sec_cache;
CompressedSecondaryCacheOptions sec_cache_opts;
status = OptionTypeInfo::ParseStruct(config_options, "",
&comp_sec_cache_options_type_info, "",
args, &sec_cache_opts);
if (status.ok()) {
sec_cache = NewCompressedSecondaryCache(sec_cache_opts);
}
if (status.ok()) {
result->swap(sec_cache);
}
return status;
} else {
return LoadSharedObject<SecondaryCache>(config_options, value, result);
}
}
Status Cache::CreateFromString(const ConfigOptions& config_options,
const std::string& value,
std::shared_ptr<Cache>* result) {
Status status;
std::shared_ptr<Cache> cache;
if (StartsWith(value, "null")) {
cache = nullptr;
} else if (value.find("://") == std::string::npos) {
if (value.find('=') == std::string::npos) {
cache = NewLRUCache(ParseSizeT(value));
} else {
LRUCacheOptions cache_opts;
status = OptionTypeInfo::ParseStruct(config_options, "",
&lru_cache_options_type_info, "",
value, &cache_opts);
if (status.ok()) {
cache = NewLRUCache(cache_opts);
}
}
if (status.ok()) {
result->swap(cache);
}
} else {
status = LoadSharedObject<Cache>(config_options, value, result);
}
return status;
}
bool Cache::AsyncLookupHandle::IsReady() {
return pending_handle == nullptr || pending_handle->IsReady();
}
bool Cache::AsyncLookupHandle::IsPending() { return pending_handle != nullptr; }
Cache::Handle* Cache::AsyncLookupHandle::Result() {
assert(!IsPending());
return result_handle;
}
void Cache::StartAsyncLookup(AsyncLookupHandle& async_handle) {
async_handle.found_dummy_entry = false; // in case re-used
assert(!async_handle.IsPending());
async_handle.result_handle =
Lookup(async_handle.key, async_handle.helper, async_handle.create_context,
async_handle.priority, async_handle.stats);
}
Cache::Handle* Cache::Wait(AsyncLookupHandle& async_handle) {
WaitAll(&async_handle, 1);
return async_handle.Result();
}
void Cache::WaitAll(AsyncLookupHandle* async_handles, size_t count) {
for (size_t i = 0; i < count; ++i) {
if (async_handles[i].IsPending()) {
// If a pending handle gets here, it should be marked at "to be handled
// by a caller" by that caller erasing the pending_cache on it.
assert(async_handles[i].pending_cache == nullptr);
}
}
}
void Cache::SetEvictionCallback(EvictionCallback&& fn) {
// Overwriting non-empty with non-empty could indicate a bug
assert(!eviction_callback_ || !fn);
eviction_callback_ = std::move(fn);
}
} // namespace ROCKSDB_NAMESPACE
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