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require 'abstract_unit'
require 'fixtures/person'
require 'fixtures/legacy_thing'
class LockWithoutDefault < ActiveRecord::Base; end
class LockWithCustomColumnWithoutDefault < ActiveRecord::Base
set_table_name :lock_without_defaults_cust
set_locking_column :custom_lock_version
end
class OptimisticLockingTest < Test::Unit::TestCase
fixtures :people, :legacy_things
def test_lock_existing
p1 = Person.find(1)
p2 = Person.find(1)
assert_equal 0, p1.lock_version
assert_equal 0, p2.lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal 0, p2.lock_version
assert_raises(ActiveRecord::StaleObjectError) { p2.save! }
end
def test_lock_new
p1 = Person.new(:first_name => 'anika')
assert_equal 0, p1.lock_version
p1.save!
p2 = Person.find(p1.id)
assert_equal 0, p1.lock_version
assert_equal 0, p2.lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal 0, p2.lock_version
assert_raises(ActiveRecord::StaleObjectError) { p2.save! }
end
def test_lock_column_name_existing
t1 = LegacyThing.find(1)
t2 = LegacyThing.find(1)
assert_equal 0, t1.version
assert_equal 0, t2.version
t1.save!
assert_equal 1, t1.version
assert_equal 0, t2.version
assert_raises(ActiveRecord::StaleObjectError) { t2.save! }
end
def test_lock_column_is_mass_assignable
p1 = Person.create(:first_name => 'bianca')
assert_equal 0, p1.lock_version
assert_equal p1.lock_version, Person.new(p1.attributes).lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal p1.lock_version, Person.new(p1.attributes).lock_version
end
def test_lock_without_default_sets_version_to_zero
t1 = LockWithoutDefault.new
assert_equal 0, t1.lock_version
end
def test_lock_with_custom_column_without_default_sets_version_to_zero
t1 = LockWithCustomColumnWithoutDefault.new
assert_equal 0, t1.custom_lock_version
end
end
# TODO: test against the generated SQL since testing locking behavior itself
# is so cumbersome. Will deadlock Ruby threads if the underlying db.execute
# blocks, so separate script called by Kernel#system is needed.
# (See exec vs. async_exec in the PostgreSQL adapter.)
# TODO: The SQL Server adapter currently has no support for pessimistic locking
unless current_adapter?(:SQLServerAdapter)
class PessimisticLockingTest < Test::Unit::TestCase
self.use_transactional_fixtures = false
fixtures :people
def setup
@allow_concurrency = ActiveRecord::Base.allow_concurrency
ActiveRecord::Base.allow_concurrency = true
end
def teardown
ActiveRecord::Base.allow_concurrency = @allow_concurrency
end
# Test typical find.
def test_sane_find_with_lock
assert_nothing_raised do
Person.transaction do
Person.find 1, :lock => true
end
end
end
# Test scoped lock.
def test_sane_find_with_scoped_lock
assert_nothing_raised do
Person.transaction do
Person.with_scope(:find => { :lock => true }) do
Person.find 1
end
end
end
end
# PostgreSQL protests SELECT ... FOR UPDATE on an outer join.
unless current_adapter?(:PostgreSQLAdapter)
# Test locked eager find.
def test_eager_find_with_lock
assert_nothing_raised do
Person.transaction do
Reader.find 1, :include => :person, :lock => true
end
end
end
end
# Locking a record reloads it.
def test_sane_lock_method
assert_nothing_raised do
Person.transaction do
person = Person.find 1
old, person.first_name = person.first_name, 'fooman'
person.lock!
assert_equal old, person.first_name
end
end
end
if current_adapter?(:PostgreSQLAdapter, :OracleAdapter)
def test_no_locks_no_wait
first, second = duel { Person.find 1 }
assert first.end > second.end
end
def test_second_lock_waits
assert [0.2, 1, 5].any? { |zzz|
first, second = duel(zzz) { Person.find 1, :lock => true }
second.end > first.end
}
end
protected
def duel(zzz = 5)
t0, t1, t2, t3 = nil, nil, nil, nil
a = Thread.new do
t0 = Time.now
Person.transaction do
yield
sleep zzz # block thread 2 for zzz seconds
end
t1 = Time.now
end
b = Thread.new do
sleep zzz / 2.0 # ensure thread 1 tx starts first
t2 = Time.now
Person.transaction { yield }
t3 = Time.now
end
a.join
b.join
assert t1 > t0 + zzz
assert t2 > t0
assert t3 > t2
[t0.to_f..t1.to_f, t2.to_f..t3.to_f]
end
end
end
end
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