ruby - Redis流水线执行顺序

Question

我正在使用 rub redis gem。想知道我是否这样做:

redis.pipelined do
    REDIS.del("users:#{current_user_id}:i-unread")
    REDIS.lpush("users:#{current_user_id}:i-read", items)
    REDIS.ltrim("users:#{current_user_id}:i-read", 0, Interaction::MAX_INTERACTIONS)
end

这个执行顺序有保证吗？

Answer 1

当然顺序是有保证的，不然流水线就没用了。您可以随时查看代码。例如，此测试明确假定命令按顺序执行:https://github.com/redis/redis-rb/blob/master/test/pipelining_commands_test.rb#L32

def test_bulk_and_multi_bulk_commands_mixed
  r.pipelined do
    r.lpush "foo", "s1"
    r.lpush "foo", "s2"
    r.mset("baz", "s3", "qux", "s4")
  end

  assert_equal 2, r.llen("foo")
  assert_equal "s2", r.lpop("foo")
  assert_equal "s1", r.lpop("foo")
  assert_equal "s3", r.get("baz")
  assert_equal "s4", r.get("qux")
end