libcryfs/implementations/caching/cache/CacheEntry.h

45 lines
942 B
C++

#pragma once
#ifndef MESSMER_BLOCKSTORE_IMPLEMENTATIONS_CACHING_CACHEENTRY_H_
#define MESSMER_BLOCKSTORE_IMPLEMENTATIONS_CACHING_CACHEENTRY_H_
#include <ctime>
#include <memory>
#include <messmer/cpp-utils/macros.h>
#include <boost/date_time/posix_time/posix_time_types.hpp>
namespace blockstore {
namespace caching {
template<class Key, class Value>
class CacheEntry {
public:
explicit CacheEntry(Value value): _lastAccess(currentTime()), _value(std::move(value)) {
}
CacheEntry(CacheEntry &&) = default;
double ageSeconds() const {
return ((double)(currentTime() - _lastAccess).total_nanoseconds()) / ((double)1000000000);
}
Value releaseValue() {
return std::move(_value);
}
private:
boost::posix_time::ptime _lastAccess;
Value _value;
static boost::posix_time::ptime currentTime() {
return boost::posix_time::microsec_clock::local_time();
}
DISALLOW_COPY_AND_ASSIGN(CacheEntry);
};
}
}
#endif