diff options
Diffstat (limited to 'activerecord/test/cases/connection_pool_test.rb')
-rw-r--r-- | activerecord/test/cases/connection_pool_test.rb | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb index 2ada2c1fe1..5cecfa90e7 100644 --- a/activerecord/test/cases/connection_pool_test.rb +++ b/activerecord/test/cases/connection_pool_test.rb @@ -128,110 +128,6 @@ module ActiveRecord end - # The connection pool is "fair" if threads waiting for - # connections receive them the order in which they began - # waiting. This ensures that we don't timeout one HTTP request - # even while well under capacity in a multi-threaded environment - # such as a Java servlet container. - # - # We don't need strict fairness: if two connections become - # available at the same time, it's fine of two threads that were - # waiting acquire the connections out of order. - # - # Thus this test prepares waiting threads and then trickles in - # available connections slowly, ensuring the wakeup order is - # correct in this case. - def test_checkout_fairness - @pool.instance_variable_set(:@size, 10) - expected = (1..@pool.size).to_a.freeze - # check out all connections so our threads start out waiting - conns = expected.map { @pool.checkout } - mutex = Mutex.new - order = [] - errors = [] - - threads = expected.map do |i| - t = Thread.new { - begin - @pool.checkout # connection return value never checked back in - mutex.synchronize { order << i } - rescue => e - mutex.synchronize { errors << e } - end - } - Thread.pass until t.status == "sleep" - t - end - - # this should wake up the waiting threads one by one in order - conns.each { |conn| @pool.checkin(conn); sleep 0.1 } - - threads.each(&:join) - - raise errors.first if errors.any? - - assert_equal(expected, order) - end - - # As mentioned in #test_checkout_fairness, we don't care about - # strict fairness. This test creates two groups of threads: - # group1 whose members all start waiting before any thread in - # group2. Enough connections are checked in to wakeup all - # group1 threads, and the fact that only group1 and no group2 - # threads acquired a connection is enforced. - def test_checkout_fairness_by_group - @pool.instance_variable_set(:@size, 10) - # take all the connections - conns = (1..10).map { @pool.checkout } - mutex = Mutex.new - successes = [] # threads that successfully got a connection - errors = [] - - make_thread = proc do |i| - t = Thread.new { - begin - @pool.checkout # connection return value never checked back in - mutex.synchronize { successes << i } - rescue => e - mutex.synchronize { errors << e } - end - } - Thread.pass until t.status == "sleep" - t - end - - # all group1 threads start waiting before any in group2 - group1 = (1..5).map(&make_thread) - group2 = (6..10).map(&make_thread) - - # checkin n connections back to the pool - checkin = proc do |n| - n.times do - c = conns.pop - @pool.checkin(c) - end - end - - checkin.call(group1.size) # should wake up all group1 - - loop do - sleep 0.1 - break if mutex.synchronize { (successes.size + errors.size) == group1.size } - end - - winners = mutex.synchronize { successes.dup } - checkin.call(group2.size) # should wake up everyone remaining - - group1.each(&:join) - group2.each(&:join) - - assert_equal((1..group1.size).to_a, winners.sort) - - if errors.any? - raise errors.first - end - end - def test_automatic_reconnect= pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec assert pool.automatic_reconnect |