1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// 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 <stack>
#include <string>
#include <unordered_map>
#include <vector>
#include "db/write_callback.h"
#include "rocksdb/db.h"
#include "rocksdb/slice.h"
#include "rocksdb/snapshot.h"
#include "rocksdb/status.h"
#include "rocksdb/types.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/optimistic_transaction_db.h"
#include "rocksdb/utilities/write_batch_with_index.h"
#include "utilities/transactions/transaction_base.h"
#include "utilities/transactions/transaction_util.h"
namespace ROCKSDB_NAMESPACE {
class OptimisticTransaction : public TransactionBaseImpl {
public:
OptimisticTransaction(OptimisticTransactionDB* db,
const WriteOptions& write_options,
const OptimisticTransactionOptions& txn_options);
// No copying allowed
OptimisticTransaction(const OptimisticTransaction&) = delete;
void operator=(const OptimisticTransaction&) = delete;
virtual ~OptimisticTransaction();
void Reinitialize(OptimisticTransactionDB* txn_db,
const WriteOptions& write_options,
const OptimisticTransactionOptions& txn_options);
Status Prepare() override;
Status Commit() override;
Status Rollback() override;
Status SetName(const TransactionName& name) override;
protected:
Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
bool read_only, bool exclusive, const bool do_validate = true,
const bool assume_tracked = false) override;
private:
ROCKSDB_FIELD_UNUSED OptimisticTransactionDB* const txn_db_;
friend class OptimisticTransactionCallback;
void Initialize(const OptimisticTransactionOptions& txn_options);
// Returns OK if it is safe to commit this transaction. Returns Status::Busy
// if there are read or write conflicts that would prevent us from committing
// OR if we can not determine whether there would be any such conflicts.
//
// Should only be called on writer thread.
Status CheckTransactionForConflicts(DB* db);
void Clear() override;
void UnlockGetForUpdate(ColumnFamilyHandle* /* unused */,
const Slice& /* unused */) override {
// Nothing to unlock.
}
Status CommitWithSerialValidate();
Status CommitWithParallelValidate();
};
// Used at commit time to trigger transaction validation
class OptimisticTransactionCallback : public WriteCallback {
public:
explicit OptimisticTransactionCallback(OptimisticTransaction* txn)
: txn_(txn) {}
Status Callback(DB* db) override {
return txn_->CheckTransactionForConflicts(db);
}
bool AllowWriteBatching() override { return false; }
private:
OptimisticTransaction* txn_;
};
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE
|
