manager

type Backend interface {
	Controllers() (map[string]controller.Controller, error)
	Groups() (map[group.ID]group.Plugin, error)
	Metadata() (map[string]metadata.Plugin, error)

	Manager
	Start() (<-chan struct{}, error)
	Stop()
}

type Leadership interface {
	// IsLeader returns true only if for certain this is a leader. False if not or unknown.
	IsLeader() (bool, error)

	// LeaderLocation returns the location of the leader
	LeaderLocation() (*url.URL, error)
}

type Manager interface {
	Leadership

	// Enforce enforces infrastructure state to match that of the specs
	Enforce(specs []types.Spec) error

	// Inspect returns the current state of the infrastructure
	Inspect() ([]types.Object, error)

	// Terminate destroys all resources associated with the specs
	Terminate(specs []types.Spec) error
}

type Options struct {

	// Name the manager runs as
	Name plugin.Name

	// Name of the Group plugin
	Group plugin.Name

	// Name of the Metadata plugin. Must be pointing to Updatable
	Metadata plugin.Name

	// Plugins for plugin lookup
	Plugins func() discovery.Plugins `json:"-" yaml:"-"`

	// Leader is the leader detector
	Leader leader.Detector `json:"-" yaml:"-"`

	// LeaderStore persists leadership information
	LeaderStore leader.Store `json:"-" yaml:"-"`

	// SpecStore persists user specs
	SpecStore store.Snapshot `json:"-" yaml:"-"`

	// MetadataStore persists var information
	MetadataStore store.Snapshot `json:"-" yaml:"-"`

	// MetadataRefreshInterval is the interval to check for updates to metadata
	MetadataRefreshInterval types.Duration
}