blob: a8e893213cc47f0cbc6a346dcb20c59af0ffb13f [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/basictypes.h"
#include "base/containers/mru_cache.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
int cached_item_live_count = 0;
struct CachedItem {
CachedItem() : value(0) {
cached_item_live_count++;
}
explicit CachedItem(int new_value) : value(new_value) {
cached_item_live_count++;
}
explicit CachedItem(const CachedItem& other) : value(other.value) {
cached_item_live_count++;
}
~CachedItem() {
cached_item_live_count--;
}
int value;
};
} // namespace
TEST(MRUCacheTest, Basic) {
typedef base::MRUCache<int, CachedItem> Cache;
Cache cache(Cache::NO_AUTO_EVICT);
// Check failure conditions
{
CachedItem test_item;
EXPECT_TRUE(cache.Get(0) == cache.end());
EXPECT_TRUE(cache.Peek(0) == cache.end());
}
static const int kItem1Key = 5;
CachedItem item1(10);
Cache::iterator inserted_item = cache.Put(kItem1Key, item1);
EXPECT_EQ(1U, cache.size());
// Check that item1 was properly inserted.
{
Cache::iterator found = cache.Get(kItem1Key);
EXPECT_TRUE(inserted_item == cache.begin());
EXPECT_TRUE(found != cache.end());
found = cache.Peek(kItem1Key);
EXPECT_TRUE(found != cache.end());
EXPECT_EQ(kItem1Key, found->first);
EXPECT_EQ(item1.value, found->second.value);
}
static const int kItem2Key = 7;
CachedItem item2(12);
cache.Put(kItem2Key, item2);
EXPECT_EQ(2U, cache.size());
// Check that item1 is the oldest since item2 was added afterwards.
{
Cache::reverse_iterator oldest = cache.rbegin();
ASSERT_TRUE(oldest != cache.rend());
EXPECT_EQ(kItem1Key, oldest->first);
EXPECT_EQ(item1.value, oldest->second.value);
}
// Check that item1 is still accessible by key.
{
Cache::iterator test_item = cache.Get(kItem1Key);
ASSERT_TRUE(test_item != cache.end());
EXPECT_EQ(kItem1Key, test_item->first);
EXPECT_EQ(item1.value, test_item->second.value);
}
// Check that retrieving item1 pushed item2 to oldest.
{
Cache::reverse_iterator oldest = cache.rbegin();
ASSERT_TRUE(oldest != cache.rend());
EXPECT_EQ(kItem2Key, oldest->first);
EXPECT_EQ(item2.value, oldest->second.value);
}
// Remove the oldest item and check that item1 is now the only member.
{
Cache::reverse_iterator next = cache.Erase(cache.rbegin());
EXPECT_EQ(1U, cache.size());
EXPECT_TRUE(next == cache.rbegin());
EXPECT_EQ(kItem1Key, next->first);
EXPECT_EQ(item1.value, next->second.value);
cache.Erase(cache.begin());
EXPECT_EQ(0U, cache.size());
}
// Check that Clear() works properly.
cache.Put(kItem1Key, item1);
cache.Put(kItem2Key, item2);
EXPECT_EQ(2U, cache.size());
cache.Clear();
EXPECT_EQ(0U, cache.size());
}
TEST(MRUCacheTest, GetVsPeek) {
typedef base::MRUCache<int, CachedItem> Cache;
Cache cache(Cache::NO_AUTO_EVICT);
static const int kItem1Key = 1;
CachedItem item1(10);
cache.Put(kItem1Key, item1);
static const int kItem2Key = 2;
CachedItem item2(20);
cache.Put(kItem2Key, item2);
// This should do nothing since the size is bigger than the number of items.
cache.ShrinkToSize(100);
// Check that item1 starts out as oldest
{
Cache::reverse_iterator iter = cache.rbegin();
ASSERT_TRUE(iter != cache.rend());
EXPECT_EQ(kItem1Key, iter->first);
EXPECT_EQ(item1.value, iter->second.value);
}
// Check that Peek doesn't change ordering
{
Cache::iterator peekiter = cache.Peek(kItem1Key);
ASSERT_TRUE(peekiter != cache.end());
Cache::reverse_iterator iter = cache.rbegin();
ASSERT_TRUE(iter != cache.rend());
EXPECT_EQ(kItem1Key, iter->first);
EXPECT_EQ(item1.value, iter->second.value);
}
}
TEST(MRUCacheTest, KeyReplacement) {
typedef base::MRUCache<int, CachedItem> Cache;
Cache cache(Cache::NO_AUTO_EVICT);
static const int kItem1Key = 1;
CachedItem item1(10);
cache.Put(kItem1Key, item1);
static const int kItem2Key = 2;
CachedItem item2(20);
cache.Put(kItem2Key, item2);
static const int kItem3Key = 3;
CachedItem item3(30);
cache.Put(kItem3Key, item3);
static const int kItem4Key = 4;
CachedItem item4(40);
cache.Put(kItem4Key, item4);
CachedItem item5(50);
cache.Put(kItem3Key, item5);
EXPECT_EQ(4U, cache.size());
for (int i = 0; i < 3; ++i) {
Cache::reverse_iterator iter = cache.rbegin();
ASSERT_TRUE(iter != cache.rend());
}
// Make it so only the most important element is there.
cache.ShrinkToSize(1);
Cache::iterator iter = cache.begin();
EXPECT_EQ(kItem3Key, iter->first);
EXPECT_EQ(item5.value, iter->second.value);
}
// Make sure that the owning version release its pointers properly.
TEST(MRUCacheTest, Owning) {
typedef base::OwningMRUCache<int, CachedItem*> Cache;
Cache cache(Cache::NO_AUTO_EVICT);
int initial_count = cached_item_live_count;
// First insert and item and then overwrite it.
static const int kItem1Key = 1;
cache.Put(kItem1Key, new CachedItem(20));
cache.Put(kItem1Key, new CachedItem(22));
// There should still be one item, and one extra live item.
Cache::iterator iter = cache.Get(kItem1Key);
EXPECT_EQ(1U, cache.size());
EXPECT_TRUE(iter != cache.end());
EXPECT_EQ(initial_count + 1, cached_item_live_count);
// Now remove it.
cache.Erase(cache.begin());
EXPECT_EQ(initial_count, cached_item_live_count);
// Now try another cache that goes out of scope to make sure its pointers
// go away.
{
Cache cache2(Cache::NO_AUTO_EVICT);
cache2.Put(1, new CachedItem(20));
cache2.Put(2, new CachedItem(20));
}
// There should be no objects leaked.
EXPECT_EQ(initial_count, cached_item_live_count);
// Check that Clear() also frees things correctly.
{
Cache cache2(Cache::NO_AUTO_EVICT);
cache2.Put(1, new CachedItem(20));
cache2.Put(2, new CachedItem(20));
EXPECT_EQ(initial_count + 2, cached_item_live_count);
cache2.Clear();
EXPECT_EQ(initial_count, cached_item_live_count);
}
}
TEST(MRUCacheTest, AutoEvict) {
typedef base::OwningMRUCache<int, CachedItem*> Cache;
static const Cache::size_type kMaxSize = 3;
int initial_count = cached_item_live_count;
{
Cache cache(kMaxSize);
static const int kItem1Key = 1, kItem2Key = 2, kItem3Key = 3, kItem4Key = 4;
cache.Put(kItem1Key, new CachedItem(20));
cache.Put(kItem2Key, new CachedItem(21));
cache.Put(kItem3Key, new CachedItem(22));
cache.Put(kItem4Key, new CachedItem(23));
// The cache should only have kMaxSize items in it even though we inserted
// more.
EXPECT_EQ(kMaxSize, cache.size());
}
// There should be no objects leaked.
EXPECT_EQ(initial_count, cached_item_live_count);
}
TEST(MRUCacheTest, HashingMRUCache) {
// Very simple test to make sure that the hashing cache works correctly.
typedef base::HashingMRUCache<std::string, CachedItem> Cache;
Cache cache(Cache::NO_AUTO_EVICT);
CachedItem one(1);
cache.Put("First", one);
CachedItem two(2);
cache.Put("Second", two);
EXPECT_EQ(one.value, cache.Get("First")->second.value);
EXPECT_EQ(two.value, cache.Get("Second")->second.value);
cache.ShrinkToSize(1);
EXPECT_EQ(two.value, cache.Get("Second")->second.value);
EXPECT_TRUE(cache.Get("First") == cache.end());
}