Upstart to Systemd porting

I have this line in an upstart conf file:

start on starting service1 or stopped service2
stop on stopping service1

How can this be translated to systemd unit target? I've searched for any kind of disjunction support but I couldn't find one.

Solution

When service2 is started, service1 should also be started. This relation can be implemented using Requires In service2's unit config file, add

Requires=service1.service

But this will start both services in parallel when you run a command to start service2. To control the order in which the services start, you need to use Before or After