105 lines
2.1 KiB
C++
105 lines
2.1 KiB
C++
#include "transaction_manager.h"
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#include <string.h>
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using namespace boost;
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using namespace persistent_data;
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using namespace std;
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//----------------------------------------------------------------
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transaction_manager::transaction_manager(block_manager<>::ptr bm,
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space_map::ptr sm)
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: bm_(bm),
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sm_(sm)
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{
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}
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transaction_manager::~transaction_manager()
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{
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}
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transaction_manager::write_ref
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transaction_manager::begin(block_address superblock, validator v)
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{
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write_ref wr = bm_->superblock(superblock, v);
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wipe_shadow_table();
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return wr;
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}
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transaction_manager::write_ref
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transaction_manager::new_block(validator v)
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{
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optional<block_address> mb = sm_->new_block();
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if (!mb)
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throw runtime_error("couldn't allocate new block");
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sm_decrementer decrementer(sm_, *mb);
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write_ref wr = bm_->write_lock_zero(*mb, v);
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add_shadow(*mb);
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decrementer.dont_bother();
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return wr;
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}
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pair<transaction_manager::write_ref, bool>
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transaction_manager::shadow(block_address orig, validator v)
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{
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if (is_shadow(orig) &&
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!sm_->count_possibly_greater_than_one(orig))
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return make_pair(bm_->write_lock(orig, v), false);
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read_ref src = bm_->read_lock(orig, v);
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optional<block_address> mb = sm_->new_block();
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if (!mb)
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throw runtime_error("couldn't allocate new block");
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write_ref dest = bm_->write_lock_zero(*mb, v);
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::memcpy(dest.data(), src.data(), MD_BLOCK_SIZE);
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ref_t count = sm_->get_count(orig);
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if (count == 0)
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throw runtime_error("shadowing free block");
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sm_->dec(orig);
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add_shadow(dest.get_location());
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return make_pair(dest, count > 1);
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}
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transaction_manager::read_ref
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transaction_manager::read_lock(block_address b)
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{
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return bm_->read_lock(b);
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}
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transaction_manager::read_ref
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transaction_manager::read_lock(block_address b, validator v)
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{
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return bm_->read_lock(b, v);
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}
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void
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transaction_manager::add_shadow(block_address b)
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{
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shadows_.insert(b);
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}
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void
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transaction_manager::remove_shadow(block_address b)
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{
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shadows_.erase(b);
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}
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bool
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transaction_manager::is_shadow(block_address b) const
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{
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return shadows_.count(b) > 0;
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}
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void
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transaction_manager::wipe_shadow_table()
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{
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shadows_.clear();
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}
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//----------------------------------------------------------------
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