114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
#include "era/restore_emitter.h"
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#include "era/superblock.h"
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using namespace era;
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using namespace persistent_data;
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//----------------------------------------------------------------
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namespace {
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class restorer : public emitter {
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public:
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restorer(metadata &md)
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: md_(md),
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in_superblock_(false),
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in_writeset_(false),
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in_era_array_(false) {
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}
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virtual void begin_superblock(std::string const &uuid,
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uint32_t data_block_size,
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pd::block_address nr_blocks,
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uint32_t current_era) {
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superblock &sb = md_.sb_;
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memcpy(sb.uuid, reinterpret_cast<__u8 const *>(uuid.c_str()),
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min<size_t>(sizeof(sb.uuid), uuid.length()));
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sb.data_block_size = data_block_size;
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sb.nr_blocks = nr_blocks;
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sb.current_era = current_era;
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md_.era_array_->grow(nr_blocks, 0);
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in_superblock_ = true;
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}
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virtual void end_superblock() {
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if (!in_superblock_)
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throw runtime_error("xml missing superblock");
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md_.commit();
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}
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virtual void begin_writeset(uint32_t era, uint32_t nr_bits) {
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if (!in_superblock_)
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throw runtime_error("missing superblock");
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if (in_writeset_)
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throw runtime_error("attempt to begin writeset when already in one");
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in_writeset_ = true;
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era_ = era;
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bits_.reset(new persistent_data::bitset(*md_.tm_));
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bits_->grow(nr_bits, false);
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}
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virtual void writeset_bit(uint32_t bit, bool value) {
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bits_->set(bit, value);
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}
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virtual void end_writeset() {
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in_writeset_ = false;
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bits_->flush();
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era_detail e;
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e.nr_bits = bits_->get_nr_bits();
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e.writeset_root = bits_->get_root();
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uint64_t key[1] = {era_};
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md_.writeset_tree_->insert(key, e);
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}
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virtual void begin_era_array() {
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if (!in_superblock_)
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throw runtime_error("missing superblock");
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in_era_array_ = true;
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}
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virtual void era(pd::block_address block, uint32_t era) {
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if (!in_era_array_)
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throw runtime_error("missing era array");
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md_.era_array_->set(block, era);
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}
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virtual void end_era_array() {
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in_era_array_ = false;
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}
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private:
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metadata &md_;
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bool in_superblock_;
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bool in_writeset_;
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uint32_t era_;
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pd::bitset::ptr bits_;
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bool in_era_array_;
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};
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}
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//----------------------------------------------------------------
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emitter::ptr
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era::create_restore_emitter(metadata &md)
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{
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return emitter::ptr(new restorer(md));
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}
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//----------------------------------------------------------------
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