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require "cases/helper"
require "support/connection_helper"
require "concurrent/atomic/cyclic_barrier"
module ActiveRecord
class PostgresqlTransactionTest < ActiveRecord::PostgreSQLTestCase
self.use_transactional_tests = false
class Sample < ActiveRecord::Base
self.table_name = "samples"
end
setup do
@connection = ActiveRecord::Base.connection
@connection.transaction do
@connection.drop_table "samples", if_exists: true
@connection.create_table("samples") do |t|
t.integer "value"
end
end
Sample.reset_column_information
end
teardown do
@connection.drop_table "samples", if_exists: true
end
test "raises SerializationFailure when a serialization failure occurs" do
assert_raises(ActiveRecord::SerializationFailure) do
before = Concurrent::CyclicBarrier.new(2)
after = Concurrent::CyclicBarrier.new(2)
thread = Thread.new do
with_warning_suppression do
Sample.transaction isolation: :serializable do
before.wait
Sample.create value: Sample.sum(:value)
after.wait
end
end
end
begin
with_warning_suppression do
Sample.transaction isolation: :serializable do
before.wait
Sample.create value: Sample.sum(:value)
after.wait
end
end
ensure
thread.join
end
end
end
test "raises Deadlocked when a deadlock is encountered" do
with_warning_suppression do
assert_raises(ActiveRecord::Deadlocked) do
barrier = Concurrent::CyclicBarrier.new(2)
s1 = Sample.create value: 1
s2 = Sample.create value: 2
thread = Thread.new do
Sample.transaction do
s1.lock!
barrier.wait
s2.update_attributes value: 1
end
end
begin
Sample.transaction do
s2.lock!
barrier.wait
s1.update_attributes value: 2
end
ensure
thread.join
end
end
end
end
protected
def with_warning_suppression
log_level = ActiveRecord::Base.connection.client_min_messages
ActiveRecord::Base.connection.client_min_messages = "error"
yield
ensure
ActiveRecord::Base.connection.client_min_messages = log_level
end
end
end
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