package interfaces

import (
	"github.com/hashicorp/nomad/client/allocrunner/state"
	cstructs "github.com/hashicorp/nomad/client/structs"
)

// AllocRunner is the interface for an allocation runner.
type AllocRunner interface {
	// ID returns the ID of the allocation being run.
	ID() string

	// Run starts the runner and begins executing all the tasks as part of the
	// allocation.
	Run()

	// State returns a copy of the runners state object
	State() *state.State

	TaskStateHandler
}

// TaskStateHandler exposes a handler to be called when a task's state changes
type TaskStateHandler interface {
	// TaskStateUpdated is used to notify the alloc runner about task state
	// changes.
	TaskStateUpdated()
}

// AllocStatsReporter gives access to the latest resource usage from the
// allocation
type AllocStatsReporter interface {
	LatestAllocStats(taskFilter string) (*cstructs.AllocResourceUsage, error)
}