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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/RWLock.h"
#include "common/Mutex.h"
#include "common/debug.h"
#include "include/lru.h"
#include "Policy.h"
#include <vector>
#include <unordered_map>
#include <string>
namespace ceph {
namespace immutable_obj_cache {
class SimplePolicy : public Policy {
public:
SimplePolicy(CephContext *cct, uint64_t block_num, float 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);
int evict_entry(std::string file_name);
void get_evict_list(std::list<std::string>* obj_list);
uint64_t get_free_entry_num();
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;
};
CephContext* cct;
float m_watermark;
uint64_t m_entry_count;
uint64_t m_max_inflight_ops;
std::atomic<uint64_t> inflight_ops = 0;
std::unordered_map<std::string, Entry*> m_cache_map;
RWLock m_cache_map_lock;
std::deque<Entry*> m_free_list;
Mutex m_free_list_lock;
LRU m_promoted_lru;
};
} // namespace immutable_obj_cache
} // namespace ceph
#endif // CEPH_CACHE_SIMPLE_POLICY_H
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