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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_THUMBNAIL_CC_SCOPED_PTR_EXPIRING_CACHE_H_
#define CHROME_BROWSER_THUMBNAIL_CC_SCOPED_PTR_EXPIRING_CACHE_H_
#include <stddef.h>
#include <memory>
#include "net/third_party/quiche/src/quiche/common/quiche_linked_hash_map.h"
namespace thumbnail {
template <class Key, class Value>
class ScopedPtrExpiringCache {
private:
typedef quiche::QuicheLinkedHashMap<Key, Value*> LinkedHashMap;
public:
typedef typename LinkedHashMap::iterator iterator;
explicit ScopedPtrExpiringCache(size_t max_cache_size)
: max_cache_size_(max_cache_size) {}
ScopedPtrExpiringCache(const ScopedPtrExpiringCache&) = delete;
ScopedPtrExpiringCache& operator=(const ScopedPtrExpiringCache&) = delete;
~ScopedPtrExpiringCache() = default;
void Put(const Key& key, std::unique_ptr<Value> value) {
Remove(key);
map_[key] = value.release();
EvictIfFull();
}
Value* Get(const Key& key) {
iterator iter = map_.find(key);
if (iter != map_.end()) {
return iter->second;
}
return nullptr;
}
std::unique_ptr<Value> Remove(const Key& key) {
iterator iter = map_.find(key);
std::unique_ptr<Value> value;
if (iter != map_.end()) {
value.reset(iter->second);
map_.erase(key);
}
return std::move(value);
}
void Clear() {
for (iterator iter = map_.begin(); iter != map_.end(); iter++) {
delete iter->second;
}
map_.clear();
}
iterator begin() { return map_.begin(); }
iterator end() { return map_.end(); }
size_t MaximumCacheSize() const { return max_cache_size_; }
size_t size() const { return map_.size(); }
private:
void EvictIfFull() {
while (map_.size() > max_cache_size_) {
iterator it = map_.begin();
delete it->second;
map_.erase(it);
}
}
size_t max_cache_size_;
LinkedHashMap map_;
};
} // namespace thumbnail
#endif // CHROME_BROWSER_THUMBNAIL_CC_SCOPED_PTR_EXPIRING_CACHE_H_
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