71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
#ifndef TRANSACTION_MANAGER_H
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#define TRANSACTION_MANAGER_H
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#include "block.h"
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#include "space_map.h"
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#include <set>
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#include <boost/shared_ptr.hpp>
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//----------------------------------------------------------------
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namespace persistent_data {
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class transaction_manager : boost::noncopyable {
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public:
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typedef boost::shared_ptr<transaction_manager> ptr;
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typedef block_manager<>::read_ref read_ref;
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typedef block_manager<>::write_ref write_ref;
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typedef block_manager<>::validator::ptr validator;
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// If the space map is persistent, then the caller should
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// hold onto a reference and remember to call sm_->commit()
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// and update the superblock before dropping the superblock
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// reference.
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transaction_manager(block_manager<>::ptr bm,
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space_map::ptr sm);
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~transaction_manager();
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// Drop the superblock reference to commit
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write_ref begin(block_address superblock);
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write_ref begin(block_address superblock, validator v);
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write_ref new_block();
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write_ref new_block(validator v);
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// shadowing returns a new write_ref, and a boolean which
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// indicates whether the children should be incremented.
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std::pair<write_ref, bool> shadow(block_address orig);
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std::pair<write_ref, bool> shadow(block_address orig, validator v);
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read_ref read_lock(block_address b);
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read_ref read_lock(block_address b, validator v);
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space_map::ptr get_sm() {
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return sm_;
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}
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void set_sm(space_map::ptr sm) {
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sm_ = sm;
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}
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block_manager<>::ptr get_bm() {
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return bm_;
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}
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private:
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void add_shadow(block_address b);
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void remove_shadow(block_address b);
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bool is_shadow(block_address b) const;
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void wipe_shadow_table();
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block_manager<>::ptr bm_;
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space_map::ptr sm_;
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std::set<block_address> shadows_;
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};
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}
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//----------------------------------------------------------------
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#endif
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