fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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108 lines
3.9 KiB
108 lines
3.9 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#ifndef ROCKSDB_LITE
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#include "utilities/transactions/write_prepared_txn.h"
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#include <map>
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#include "db/column_family.h"
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#include "db/db_impl.h"
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#include "rocksdb/db.h"
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#include "rocksdb/status.h"
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#include "rocksdb/utilities/transaction_db.h"
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#include "utilities/transactions/pessimistic_transaction.h"
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#include "utilities/transactions/pessimistic_transaction_db.h"
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namespace rocksdb {
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struct WriteOptions;
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WritePreparedTxn::WritePreparedTxn(WritePreparedTxnDB* txn_db,
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const WriteOptions& write_options,
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const TransactionOptions& txn_options)
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: PessimisticTransaction(txn_db, write_options, txn_options),
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wpt_db_(txn_db) {
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PessimisticTransaction::Initialize(txn_options);
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}
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Status WritePreparedTxn::Get(const ReadOptions& read_options,
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ColumnFamilyHandle* column_family,
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const Slice& key, PinnableSlice* pinnable_val) {
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auto snapshot = GetSnapshot();
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auto snap_seq =
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snapshot != nullptr ? snapshot->GetSequenceNumber() : kMaxSequenceNumber;
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WritePreparedTxnReadCallback callback(wpt_db_, snap_seq);
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return write_batch_.GetFromBatchAndDB(db_, read_options, column_family, key,
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pinnable_val, &callback);
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}
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Status WritePreparedTxn::PrepareInternal() {
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WriteOptions write_options = write_options_;
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write_options.disableWAL = false;
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WriteBatchInternal::MarkEndPrepare(GetWriteBatch()->GetWriteBatch(), name_);
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const bool disable_memtable = true;
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uint64_t seq_used;
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Status s =
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db_impl_->WriteImpl(write_options, GetWriteBatch()->GetWriteBatch(),
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/*callback*/ nullptr, &log_number_, /*log ref*/ 0,
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!disable_memtable, &seq_used);
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prepare_seq_ = seq_used;
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wpt_db_->AddPrepared(prepare_seq_);
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return s;
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}
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Status WritePreparedTxn::CommitWithoutPrepareInternal() {
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return CommitBatchInternal(GetWriteBatch()->GetWriteBatch());
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}
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Status WritePreparedTxn::CommitBatchInternal(WriteBatch* batch) {
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const bool disable_memtable = true;
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const uint64_t no_log_ref = 0;
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uint64_t seq_used;
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auto s = db_impl_->WriteImpl(write_options_, batch, nullptr, nullptr,
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no_log_ref, !disable_memtable, &seq_used);
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uint64_t& prepare_seq = seq_used;
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uint64_t& commit_seq = seq_used;
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// TODO(myabandeh): skip AddPrepared
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wpt_db_->AddPrepared(prepare_seq);
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wpt_db_->AddCommitted(prepare_seq, commit_seq);
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return s;
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}
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Status WritePreparedTxn::CommitInternal() {
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// We take the commit-time batch and append the Commit marker.
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// The Memtable will ignore the Commit marker in non-recovery mode
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WriteBatch* working_batch = GetCommitTimeWriteBatch();
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// TODO(myabandeh): prevent the users from writing to txn after the prepare
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// phase
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assert(working_batch->Count() == 0);
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WriteBatchInternal::MarkCommit(working_batch, name_);
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// any operations appended to this working_batch will be ignored from WAL
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working_batch->MarkWalTerminationPoint();
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const bool disable_memtable = true;
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uint64_t seq_used;
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auto s = db_impl_->WriteImpl(write_options_, working_batch, nullptr, nullptr,
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log_number_, disable_memtable, &seq_used);
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uint64_t& commit_seq = seq_used;
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// TODO(myabandeh): Reject a commit request if AddCommitted cannot encode
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// commit_seq. This happens if prep_seq <<< commit_seq.
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wpt_db_->AddCommitted(prepare_seq_, commit_seq);
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return s;
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}
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Status WritePreparedTxn::Rollback() {
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// TODO(myabandeh) Implement this
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throw std::runtime_error("Rollback not Implemented");
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return Status::OK();
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}
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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