thin-provisioning-tools/caching/hint_array.h
Joe Thornber a7c96c0e1e [everything] Fix circular shared pointer references.
We had a cycle from transaction_manager <-> space_map, and also from
the ref_counters back up to the tm.

This prevented objects being destroyed when various programs exited.

From now on we'll try and only use a shared ptr if ownership is
implied.  Otherwise a reference will be used (eg, for up pointers).
2014-08-26 11:14:49 +01:00

87 lines
1.9 KiB
C++

#ifndef CACHE_HINT_ARRAY_H
#define CACHE_HINT_ARRAY_H
#include "persistent-data/data-structures/array.h"
#include <string>
//----------------------------------------------------------------
namespace caching {
namespace hint_array_damage {
class damage_visitor;
class damage {
public:
damage(std::string const &desc)
: desc_(desc) {
}
virtual ~damage() {}
virtual void visit(damage_visitor &v) const = 0;
std::string get_desc() const {
return desc_;
}
private:
std::string desc_;
};
struct missing_hints : public damage {
missing_hints(std::string const desc, run<uint32_t> const &keys);
virtual void visit(damage_visitor &v) const;
run<uint32_t> keys_;
};
class damage_visitor {
public:
virtual ~damage_visitor() {}
void visit(damage const &d) {
d.visit(*this);
}
virtual void visit(missing_hints const &d) = 0;
};
}
class hint_visitor {
public:
virtual ~hint_visitor() {}
virtual void visit(block_address cblock, std::vector<unsigned char> const &data) = 0;
};
class hint_array {
public:
typedef boost::shared_ptr<hint_array> ptr;
hint_array(transaction_manager &tm, unsigned width);
hint_array(transaction_manager &tm, unsigned width, block_address root, unsigned nr_entries);
unsigned get_nr_entries() const;
void grow(unsigned new_nr_entries, void const *v);
block_address get_root() const;
void get_hint(unsigned index, vector<unsigned char> &data) const;
void set_hint(unsigned index, vector<unsigned char> const &data);
void grow(unsigned new_nr_entries, vector<unsigned char> const &value);
void walk(hint_visitor &hv, hint_array_damage::damage_visitor &dv);
void check(hint_array_damage::damage_visitor &visitor);
private:
static uint32_t check_width(uint32_t width);
unsigned width_;
boost::shared_ptr<persistent_data::array_base> impl_;
};
}
//----------------------------------------------------------------
#endif