+ def cancel(cascade: false, need_transaction: true)
+ if need_transaction
+ ActiveRecord::Base.transaction do
+ cancel(cascade: cascade, need_transaction: false)
+ end
+ return
+ end
+
+ if self.state.in?([Queued, Running])
+ self.state = Cancelled
+ self.save!
+ elsif self.state != Cancelled
+ raise InvalidStateTransitionError
+ end
+
+ return if !cascade
+
+ # cancel all children; they could be jobs or pipeline instances
+ children = self.components.andand.collect{|_, u| u}.compact
+
+ return if children.empty?
+
+ # cancel any child jobs
+ Job.where(uuid: children, state: [Queued, Running]).each do |job|
+ job.cancel(cascade: cascade, need_transaction: false)
+ end
+
+ # cancel any child pipelines
+ PipelineInstance.where(uuid: children, state: [PipelineInstance::RunningOnServer, PipelineInstance::RunningOnClient]).each do |pi|
+ pi.cancel(cascade: cascade, need_transaction: false)
+ end
+ end
+