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// Copyright (c) 2013, 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).
//
#include "utilities/persistent_cache/hash_table.h"
#include <cstdlib>
#include <iostream>
#include <set>
#include <string>
#include "db/db_test_util.h"
#include "memory/arena.h"
#include "test_util/testharness.h"
#include "util/random.h"
#include "utilities/persistent_cache/hash_table_evictable.h"
namespace ROCKSDB_NAMESPACE {
struct HashTableTest : public testing::Test {
~HashTableTest() override { map_.Clear(&HashTableTest::ClearNode); }
struct Node {
Node() = default;
explicit Node(const uint64_t key, const std::string& val = std::string())
: key_(key), val_(val) {}
uint64_t key_ = 0;
std::string val_;
};
struct Equal {
bool operator()(const Node& lhs, const Node& rhs) {
return lhs.key_ == rhs.key_;
}
};
struct Hash {
uint64_t operator()(const Node& node) {
return std::hash<uint64_t>()(node.key_);
}
};
static void ClearNode(Node /*node*/) {}
HashTable<Node, Hash, Equal> map_;
};
struct EvictableHashTableTest : public testing::Test {
~EvictableHashTableTest() override {
map_.Clear(&EvictableHashTableTest::ClearNode);
}
struct Node : LRUElement<Node> {
Node() = default;
explicit Node(const uint64_t key, const std::string& val = std::string())
: key_(key), val_(val) {}
uint64_t key_ = 0;
std::string val_;
std::atomic<uint32_t> refs_{0};
};
struct Equal {
bool operator()(const Node* lhs, const Node* rhs) {
return lhs->key_ == rhs->key_;
}
};
struct Hash {
uint64_t operator()(const Node* node) {
return std::hash<uint64_t>()(node->key_);
}
};
static void ClearNode(Node* /*node*/) {}
EvictableHashTable<Node, Hash, Equal> map_;
};
TEST_F(HashTableTest, TestInsert) {
const uint64_t max_keys = 1024 * 1024;
// insert
for (uint64_t k = 0; k < max_keys; ++k) {
map_.Insert(Node(k, std::string(1000, k % 255)));
}
// verify
for (uint64_t k = 0; k < max_keys; ++k) {
Node val;
port::RWMutex* rlock = nullptr;
assert(map_.Find(Node(k), &val, &rlock));
rlock->ReadUnlock();
assert(val.val_ == std::string(1000, k % 255));
}
}
TEST_F(HashTableTest, TestErase) {
const uint64_t max_keys = 1024 * 1024;
// insert
for (uint64_t k = 0; k < max_keys; ++k) {
map_.Insert(Node(k, std::string(1000, k % 255)));
}
auto rand = Random64(time(nullptr));
// erase a few keys randomly
std::set<uint64_t> erased;
for (int i = 0; i < 1024; ++i) {
uint64_t k = rand.Next() % max_keys;
if (erased.find(k) != erased.end()) {
continue;
}
assert(map_.Erase(Node(k), /*ret=*/nullptr));
erased.insert(k);
}
// verify
for (uint64_t k = 0; k < max_keys; ++k) {
Node val;
port::RWMutex* rlock = nullptr;
bool status = map_.Find(Node(k), &val, &rlock);
if (erased.find(k) == erased.end()) {
assert(status);
rlock->ReadUnlock();
assert(val.val_ == std::string(1000, k % 255));
} else {
assert(!status);
}
}
}
TEST_F(EvictableHashTableTest, TestEvict) {
const uint64_t max_keys = 1024 * 1024;
// insert
for (uint64_t k = 0; k < max_keys; ++k) {
map_.Insert(new Node(k, std::string(1000, k % 255)));
}
// verify
for (uint64_t k = 0; k < max_keys; ++k) {
Node* val = map_.Evict();
// unfortunately we can't predict eviction value since it is from any one of
// the lock stripe
assert(val);
assert(val->val_ == std::string(1000, val->key_ % 255));
delete val;
}
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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