// startProvisionerWorker kicks off a provisioner task responsible for creating containers
// of the specified type on the machine.
func startProvisionerWorker(runner worker.Runner, containerType instance.ContainerType,
	provisioner *apiprovisioner.State, config agent.Config, broker environs.InstanceBroker) error {

	workerName := fmt.Sprintf("%s-provisioner", containerType)
	// The provisioner task is created after a container record has already been added to the machine.
	// It will see that the container does not have an instance yet and create one.
	return runner.StartWorker(workerName, func() (worker.Worker, error) {
		return NewContainerProvisioner(containerType, provisioner, config, broker), nil
	})
}
Exemple #2
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// startWorkerAfterUpgrade starts a worker to run the specified child worker
// but only after waiting for upgrades to complete.
func (a *MachineAgent) startWorkerAfterUpgrade(runner worker.Runner, name string, start func() (worker.Worker, error)) {
	runner.StartWorker(name, func() (worker.Worker, error) {
		return a.upgradeWaiterWorker(start), nil
	})
}