type CgroupConfig struct {

	// Fully qualified name
	Name string
	// ResourceParameters contains various cgroups settings to apply.
	ResourceParameters *ResourceConfig
}

type CgroupManager interface {
	// Create creates and applies the cgroup configurations on the cgroup.
	// It just creates the leaf cgroups.
	// It expects the parent cgroup to already exist.
	Create(*CgroupConfig) error
	// Destroys the cgroup.
	Destroy(*CgroupConfig) error
	// Update cgroup configuration.
	Update(*CgroupConfig) error
	// Exists checks if the cgroup already exists
	Exists(string) bool
}

type CgroupSubsystems struct {
	Mounts      []interface{}
	MountPoints map[string]string
}

type ContainerManager interface {
	// Runs the container manager's housekeeping.
	// - Ensures that the Docker daemon is in a container.
	// - Creates the system container where all non-containerized processes run.
	Start(*api.Node) error

	// Returns resources allocated to system cgroups in the machine.
	// These cgroups include the system and Kubernetes services.
	SystemCgroupsLimit() api.ResourceList

	// Returns a NodeConfig that is being used by the container manager.
	GetNodeConfig() NodeConfig

	// Returns internal Status.
	Status() Status

	// NewPodContainerManager is a factory method which returns a podContainerManager object
	// Returns a noop implementation if qos cgroup hierarchy is not enabled
	NewPodContainerManager() PodContainerManager

	// GetMountedSubsystems returns the mounted cgroup subsytems on the node
	GetMountedSubsystems() *CgroupSubsystems

	// GetQOSContainersInfo returns the names of top level QoS containers
	GetQOSContainersInfo() QOSContainersInfo
}

type NodeConfig struct {
	RuntimeCgroupsName    string
	SystemCgroupsName     string
	KubeletCgroupsName    string
	ContainerRuntime      string
	CgroupsPerQOS         bool
	CgroupRoot            string
	ProtectKernelDefaults bool
}

type PodContainerManager interface {
	// getPodContainerName returns the pod container's absolute name
	GetPodContainerName(*api.Pod) string

	// EnsureExists takes a pod as argument and makes sure that
	// pod cgroup exists if qos cgroup hierarchy flag is enabled.
	// If the pod cgroup doesen't already exist this method creates it.
	EnsureExists(*api.Pod) error

	Exists(*api.Pod) bool

	//Destroy takes a pod as argument and destroys the pod's container.
	Destroy(string) error
}

type QOSContainersInfo struct {
	Guaranteed string
	BestEffort string
	Burstable  string
}

type ResourceConfig struct {
	// Memory limit (in bytes).
	Memory *int64
	// CPU shares (relative weight vs. other containers).
	CpuShares *int64
	// CPU hardcap limit (in usecs). Allowed cpu time in a given period.
	CpuQuota *int64
}

type Status struct {
	// Any soft requirements that were unsatisfied.
	SoftRequirements error
}