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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <stdio.h>
#include "gtest/gtest.h"
#include "common/intrusive_lru.h"
template <typename TestLRUItem>
struct item_to_unsigned {
using type = unsigned;
const type &operator()(const TestLRUItem &item) {
return item.key;
}
};
struct TestLRUItem : public ceph::common::intrusive_lru_base<
ceph::common::intrusive_lru_config<
unsigned, TestLRUItem, item_to_unsigned<TestLRUItem>>> {
unsigned key = 0;
int value = 0;
TestLRUItem(unsigned key) : key(key) {}
};
class LRUTest : public TestLRUItem::lru_t {
public:
auto add(unsigned int key, int value) {
auto [ref, key_existed] = get_or_create(key);
if (!key_existed) {
ref->value = value;
}
return std::pair(ref, key_existed);
}
};
TEST(LRU, add_immediate_evict) {
LRUTest cache;
unsigned int key = 1;
int value1 = 2;
int value2 = 3;
{
auto [ref, existed] = cache.add(key, value1);
ASSERT_TRUE(ref);
ASSERT_EQ(value1, ref->value);
ASSERT_FALSE(existed);
}
{
auto [ref2, existed] = cache.add(key, value2);
ASSERT_EQ(value2, ref2->value);
ASSERT_FALSE(existed);
}
}
TEST(LRU, lookup_lru_size) {
LRUTest cache;
int key = 1;
int value = 1;
cache.set_target_size(1);
{
auto [ref, existed] = cache.add(key, value);
ASSERT_TRUE(ref);
ASSERT_FALSE(existed);
}
{
auto [ref, existed] = cache.add(key, value);
ASSERT_TRUE(ref);
ASSERT_TRUE(existed);
}
cache.set_target_size(0);
auto [ref2, existed2] = cache.add(key, value);
ASSERT_TRUE(ref2);
ASSERT_FALSE(existed2);
{
auto [ref, existed] = cache.add(key, value);
ASSERT_TRUE(ref);
ASSERT_TRUE(existed);
}
}
TEST(LRU, eviction) {
const unsigned SIZE = 3;
LRUTest cache;
cache.set_target_size(SIZE);
for (unsigned i = 0; i < SIZE; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref && !existed);
}
{
auto [ref, existed] = cache.add(0, 0);
ASSERT_TRUE(ref && existed);
}
for (unsigned i = SIZE; i < (2*SIZE) - 1; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref && !existed);
}
{
auto [ref, existed] = cache.add(0, 0);
ASSERT_TRUE(ref && existed);
}
for (unsigned i = 1; i < SIZE; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref && !existed);
}
}
TEST(LRU, eviction_live_ref) {
const unsigned SIZE = 3;
LRUTest cache;
cache.set_target_size(SIZE);
auto [live_ref, existed2] = cache.add(1, 1);
ASSERT_TRUE(live_ref && !existed2);
for (unsigned i = 0; i < SIZE; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref);
if (i == 1) {
ASSERT_TRUE(existed);
} else {
ASSERT_FALSE(existed);
}
}
{
auto [ref, existed] = cache.add(0, 0);
ASSERT_TRUE(ref && existed);
}
for (unsigned i = SIZE; i < (2*SIZE) - 1; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref && !existed);
}
for (unsigned i = 0; i < SIZE; ++i) {
auto [ref, existed] = cache.add(i, i);
ASSERT_TRUE(ref);
if (i == 1) {
ASSERT_TRUE(existed);
} else {
ASSERT_FALSE(existed);
}
}
}
TEST(LRU, clear_range) {
LRUTest cache;
const unsigned SIZE = 10;
cache.set_target_size(SIZE);
{
auto [ref, existed] = cache.add(1, 4);
ASSERT_FALSE(existed);
}
{
auto [ref, existed] = cache.add(2, 4);
ASSERT_FALSE(existed);
}
{
auto [ref, existed] = cache.add(3, 4);
ASSERT_FALSE(existed);
}
// Unlike above, the reference is not being destroyed
auto [live_ref1, existed1] = cache.add(4, 4);
ASSERT_FALSE(existed1);
auto [live_ref2, existed2] = cache.add(5, 4);
ASSERT_FALSE(existed2);
cache.clear_range(0,4);
// Should not exists (Unreferenced):
{
auto [ref, existed] = cache.add(1, 4);
ASSERT_FALSE(existed);
}
{
auto [ref, existed] = cache.add(2, 4);
ASSERT_FALSE(existed);
}
{
auto [ref, existed] = cache.add(3, 4);
ASSERT_FALSE(existed);
}
// Should exist (Still being referenced):
{
auto [ref, existed] = cache.add(4, 4);
ASSERT_TRUE(existed);
}
// Should exists (Still being referenced and wasn't removed)
{
auto [ref, existed] = cache.add(5, 4);
ASSERT_TRUE(existed);
}
// Test out of bound deletion:
{
cache.clear_range(3,8);
auto [ref, existed] = cache.add(4, 4);
ASSERT_TRUE(existed);
}
{
auto [ref, existed] = cache.add(3, 4);
ASSERT_FALSE(existed);
}
}
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