1 files changed, 71 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/transactions/optimistic_transaction_db_impl.h b/src/rocksdb/utilities/transactions/optimistic_transaction_db_impl.h
new file mode 100644
index 000000000..d895d49b8
--- /dev/null
+++ b/src/rocksdb/utilities/transactions/optimistic_transaction_db_impl.h
@@ -0,0 +1,71 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#ifndef ROCKSDB_LITE
+
+#include <mutex>
+#include <vector>
+#include <algorithm>
+
+#include "rocksdb/db.h"
+#include "rocksdb/options.h"
+#include "rocksdb/utilities/optimistic_transaction_db.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class OptimisticTransactionDBImpl : public OptimisticTransactionDB {
+ public:
+  explicit OptimisticTransactionDBImpl(
+      DB* db, const OptimisticTransactionDBOptions& occ_options,
+      bool take_ownership = true)
+      : OptimisticTransactionDB(db),
+        db_owner_(take_ownership),
+        validate_policy_(occ_options.validate_policy) {
+    if (validate_policy_ == OccValidationPolicy::kValidateParallel) {
+      uint32_t bucket_size = std::max(16u, occ_options.occ_lock_buckets);
+      bucketed_locks_.reserve(bucket_size);
+      for (size_t i = 0; i < bucket_size; ++i) {
+        bucketed_locks_.emplace_back(
+            std::unique_ptr<std::mutex>(new std::mutex));
+      }
+    }
+  }
+
+  ~OptimisticTransactionDBImpl() {
+    // Prevent this stackable from destroying
+    // base db
+    if (!db_owner_) {
+      db_ = nullptr;
+    }
+  }
+
+  Transaction* BeginTransaction(const WriteOptions& write_options,
+                                const OptimisticTransactionOptions& txn_options,
+                                Transaction* old_txn) override;
+
+  size_t GetLockBucketsSize() const { return bucketed_locks_.size(); }
+
+  OccValidationPolicy GetValidatePolicy() const { return validate_policy_; }
+
+  std::unique_lock<std::mutex> LockBucket(size_t idx);
+
+ private:
+  // NOTE: used in validation phase. Each key is hashed into some
+  // bucket. We then take the lock in the hash value order to avoid deadlock.
+  std::vector<std::unique_ptr<std::mutex>> bucketed_locks_;
+
+  bool db_owner_;
+
+  const OccValidationPolicy validate_policy_;
+
+  void ReinitializeTransaction(Transaction* txn,
+                               const WriteOptions& write_options,
+                               const OptimisticTransactionOptions& txn_options =
+                                   OptimisticTransactionOptions());
+};
+
+}  // namespace ROCKSDB_NAMESPACE
+#endif  // ROCKSDB_LITE