Simultaneous action of 3 switches

Setup, Configuration and Use Items & Sitemaps
5

In openHAB 4, there’s also triggeringGroup which is handy in this situation

rule "Sync switches"
when
    Member of SwitchGroup changed
then
    triggeringGroup.members
                   .filter[ item | item.state != newState ]
                   .forEach[ item | item.sendCommand(newState) ])
end

in JRuby, triggeringGroup is available as event.group

rule "Sync Switches" do
  changed SwitchGroup.members
  run do |event|
    event.group.members.ensure.command(event.state)
  end
end

Or in one line:

changed(SwitchGroup.members) { |event| event.group.members.ensure.command(event.state) }

It’s very useful when you have multiple groups, so you can use one rule

rule "Sync Switches" do
  changed SwitchGroup1.members
  changed HallwayGroup.members
  changed LivingRoomGroup.members
  run do |event|
    event.group.members.ensure.command(event.state)
  end
end

Or you can also write it as:

rule "Sync Switches" do
  changed SwitchGroup1.members, HallwayGroup.members, LivingRoomGroup.members
  run do |event|
    event.group.members.ensure.command(event.state)
  end
end
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