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|
module ActiveRecord
module ConnectionAdapters
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, current_transaction, 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(@connection)
end
end
class Transaction #:nodoc:
attr_reader :connection
def initialize(connection)
@connection = connection
@state = TransactionState.new
end
def state
@state
end
def savepoint_name
nil
end
end
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 ClosedTransaction < Transaction #:nodoc:
def number
0
end
def begin(options = {})
RealTransaction.new(connection, self, options)
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 :parent, :records
attr_writer :joinable
def initialize(connection, parent, options = {})
super connection
@parent = parent
@records = []
@joinable = options.fetch(:joinable, true)
end
def joinable?
@joinable
end
def number
parent.number + 1
end
def begin(options = {})
SavepointTransaction.new(connection, self, options)
end
def rollback
perform_rollback
parent
end
def commit
perform_commit
parent
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!(parent.closed?)
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, parent, options = {})
super
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, parent, options = {})
if options[:isolation]
raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
end
super
# Savepoint name only counts the Savepoint transactions, so we need to subtract 1
@savepoint_name = "active_record_#{number - 1}"
connection.create_savepoint(@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
end
end
|
