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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
module ActiveRecord
module ConnectionAdapters
class TransactionState
attr_reader :parent
VALID_STATES = Set.new([:committed, :rolledback, nil])
def initialize(state = nil)
@state = state
@parent = nil
end
def finalized?
@state
end
def committed?
@state == :committed
end
def rolledback?
@state == :rolledback
end
def set_state(state)
if !VALID_STATES.include?(state)
raise ArgumentError, "Invalid transaction state: #{state}"
end
@state = state
end
end
class Transaction #:nodoc:
attr_reader :connection, :state
def initialize(connection)
@connection = connection
@state = TransactionState.new
end
def savepoint_name
nil
end
end
class ClosedTransaction < Transaction #:nodoc:
def initialize; super(nil); end
def closed?; true; end
def open?; false; end
def joinable?; false; end
# This is a noop when there are no open transactions
def add_record(record); end
end
class OpenTransaction < Transaction #:nodoc:
attr_reader :records
attr_writer :joinable
def initialize(connection, options = {})
super connection
@records = []
@joinable = options.fetch(:joinable, true)
end
def joinable?
@joinable
end
def rollback
perform_rollback
end
def commit
perform_commit
end
def add_record(record)
if record.has_transactional_callbacks?
records << record
else
record.set_transaction_state(@state)
end
end
def rollback_records
@state.set_state(:rolledback)
records.uniq.each do |record|
begin
record.rolledback!(self.is_a?(RealTransaction))
rescue => e
record.logger.error(e) if record.respond_to?(:logger) && record.logger
end
end
end
def commit_records
@state.set_state(:committed)
records.uniq.each do |record|
begin
record.committed!
rescue => e
record.logger.error(e) if record.respond_to?(:logger) && record.logger
end
end
end
def closed?
false
end
def open?
true
end
end
class RealTransaction < OpenTransaction #:nodoc:
def initialize(connection, _, options = {})
super(connection, options)
if options[:isolation]
connection.begin_isolated_db_transaction(options[:isolation])
else
connection.begin_db_transaction
end
end
def perform_rollback
connection.rollback_db_transaction
rollback_records
end
def perform_commit
connection.commit_db_transaction
commit_records
end
end
class SavepointTransaction < OpenTransaction #:nodoc:
attr_reader :savepoint_name
def initialize(connection, savepoint_name, options = {})
if options[:isolation]
raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
end
super(connection, options)
connection.create_savepoint(@savepoint_name = savepoint_name)
end
def perform_rollback
connection.rollback_to_savepoint(savepoint_name)
rollback_records
end
def perform_commit
@state.set_state(:committed)
connection.release_savepoint(savepoint_name)
end
end
class TransactionManager #:nodoc:
def initialize(connection)
@stack = []
@connection = connection
end
def begin_transaction(options = {})
transaction_class = @stack.empty? ? RealTransaction : SavepointTransaction
transaction = transaction_class.new(@connection, "active_record_#{@stack.size}", options)
@stack.push(transaction)
transaction
end
def commit_transaction
@stack.pop.commit
end
def rollback_transaction
@stack.pop.rollback
end
def within_new_transaction(options = {})
transaction = begin_transaction options
yield
rescue Exception => error
transaction.rollback if transaction
raise
ensure
begin
transaction.commit unless error
rescue Exception
transaction.rollback
raise
ensure
@stack.pop if transaction
end
end
def open_transactions
@stack.size
end
def current_transaction
@stack.last || closed_transaction
end
private
def closed_transaction
@closed_transaction ||= ClosedTransaction.new
end
end
end
end
|