175 lines
3.7 KiB
C++
175 lines
3.7 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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//----------------------------------------------------------------
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template <uint32_t BlockSize>
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transaction_manager<BlockSize>::transaction_manager(typename block_manager<BlockSize>::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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template <uint32_t BlockSize>
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transaction_manager<BlockSize>::~transaction_manager()
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{
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::reserve_block(block_address location)
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{
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sm_->inc_block(location);
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::begin()
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{
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::pre_commit()
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{
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sm_->commit();
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::commit(write_ref superblock)
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{
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bm_->flush(superblock);
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wipe_shadow_table();
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}
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template <uint32_t BlockSize>
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block_address
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transaction_manager<BlockSize>::alloc_block()
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{
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return sm_->new_block();
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}
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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::write_ref
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transaction_manager<BlockSize>::new_block()
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{
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block_address b = sm_->new_block();
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add_shadow(b);
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return bm_->write_lock_zero(b);
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}
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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::write_ref
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transaction_manager<BlockSize>::new_block(block_validator const &v)
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{
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block_address b = sm_->new_block();
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add_shadow(b);
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return bm_->write_lock_zero(b, v);
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}
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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::write_ref
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transaction_manager<BlockSize>::shadow(block_address orig, bool &inc_children)
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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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inc_children = false;
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return bm_->write_lock(orig);
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}
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auto src = bm_->read_lock(orig);
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auto dest = bm_->write_lock_zero(sm_->new_block());
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::memcpy(dest->data_, src->data_, BlockSize);
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ref_t count = sm_->get_count(orig);
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sm_->dec_block(orig);
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inc_children = count > 1;
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add_shadow(dest->location_);
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return dest;
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}
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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::write_ref
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transaction_manager<BlockSize>::shadow(block_address orig, block_validator const &v, bool &inc_children)
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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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inc_children = false;
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return bm_->write_lock(orig);
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}
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auto src = bm_->read_lock(orig, v);
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auto dest = bm_->write_lock_zero(sm_->new_block(), v);
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::memcpy(dest->data_, src->data_, BlockSize);
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ref_t count = sm_->get_count(orig);
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sm_->dec_block(orig);
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inc_children = count > 1;
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add_shadow(dest->location_);
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return dest;
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}
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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::read_ref
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transaction_manager<BlockSize>::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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template <uint32_t BlockSize>
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typename transaction_manager<BlockSize>::read_ref
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transaction_manager<BlockSize>::read_lock(block_address b, block_validator const &v)
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{
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return bm_->read_lock(b, v);
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::inc(block_address b)
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{
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sm_->inc_block(b);
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::dec(block_address b)
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{
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sm_->dec_block(b);
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}
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template <uint32_t BlockSize>
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uint32_t
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transaction_manager<BlockSize>::ref_count(block_address b) const
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{
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return sm_->get_count(b);
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::add_shadow(block_address b)
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{
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shadows_.insert(b);
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}
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template <uint32_t BlockSize>
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bool
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transaction_manager<BlockSize>::is_shadow(block_address b)
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{
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return shadows_.count(b) > 0;
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}
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template <uint32_t BlockSize>
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void
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transaction_manager<BlockSize>::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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