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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_CACHE_SIMPLE_POLICY_H
#define CEPH_CACHE_SIMPLE_POLICY_H
#include "common/ceph_context.h"
#include "common/ceph_mutex.h"
#include "include/lru.h"
#include "Policy.h"
#include <unordered_map>
#include <string>
namespace ceph {
namespace immutable_obj_cache {
class SimplePolicy : public Policy {
public:
SimplePolicy(CephContext *cct, uint64_t block_num, uint64_t max_inflight,
double watermark);
~SimplePolicy();
cache_status_t lookup_object(std::string file_name);
cache_status_t get_status(std::string file_name);
void update_status(std::string file_name,
cache_status_t new_status,
uint64_t size = 0);
int evict_entry(std::string file_name);
void get_evict_list(std::list<std::string>* obj_list);
uint64_t get_free_size();
uint64_t get_promoting_entry_num();
uint64_t get_promoted_entry_num();
std::string get_evict_entry();
private:
cache_status_t alloc_entry(std::string file_name);
class Entry : public LRUObject {
public:
cache_status_t status;
Entry() : status(OBJ_CACHE_NONE) {}
std::string file_name;
uint64_t size;
};
CephContext* cct;
double m_watermark;
uint64_t m_max_inflight_ops;
uint64_t m_max_cache_size;
std::atomic<uint64_t> inflight_ops = 0;
std::unordered_map<std::string, Entry*> m_cache_map;
ceph::shared_mutex m_cache_map_lock =
ceph::make_shared_mutex("rbd::cache::SimplePolicy::m_cache_map_lock");
std::atomic<uint64_t> m_cache_size;
LRU m_promoted_lru;
};
} // namespace immutable_obj_cache
} // namespace ceph
#endif // CEPH_CACHE_SIMPLE_POLICY_H
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