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|
module ActiveRecord
module ConnectionAdapters
class Transaction #:nodoc:
attr_reader :connection
def initialize(connection)
@connection = connection
@state = TransactionState.new
end
def state
@state
end
end
class TransactionState
attr_accessor :parent
VALID_STATES = Set.new([:committed, :rolledback, nil])
def initialize(state = nil)
@state = state
@parent = nil
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 = []
@finishing = false
@joinable = options.fetch(:joinable, true)
end
# This state is necesarry so that we correctly handle stuff that might
# happen in a commit/rollback. But it's kinda distasteful. Maybe we can
# find a better way to structure it in the future.
def finishing?
@finishing
end
def joinable?
@joinable && !finishing?
end
def number
if finishing?
parent.number
else
parent.number + 1
end
end
def begin(options = {})
if finishing?
parent.begin
else
SavepointTransaction.new(connection, self, options)
end
end
def rollback
@finishing = true
perform_rollback
parent
end
def commit
@finishing = true
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:
def initialize(connection, parent, options = {})
if options[:isolation]
raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
end
super
connection.create_savepoint
end
def perform_rollback
connection.rollback_to_savepoint
rollback_records
end
def perform_commit
@state.set_state(:committed)
@state.parent = parent.state
connection.release_savepoint
end
end
end
end
|
