// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package container

import (
	"fmt"

	"github.com/google/cadvisor/info"
)

// Listing types.
const (
	LIST_SELF = iota
	LIST_RECURSIVE
)

type ListType int

// Interface for container operation handlers.
type ContainerHandler interface {
	ContainerReference() (info.ContainerReference, error)
	GetSpec() (*info.ContainerSpec, error)
	GetStats() (*info.ContainerStats, error)
	ListContainers(listType ListType) ([]info.ContainerReference, error)
	ListThreads(listType ListType) ([]int, error)
	ListProcesses(listType ListType) ([]int, error)
	StatsPercentiles() (*info.ContainerStatsPercentiles, error)
}

type NoStatsSummary struct {
}

func (self *NoStatsSummary) StatsPercentiles() (*info.ContainerStatsPercentiles, error) {
	return nil, fmt.Errorf("This method (StatsSummary) should never be called")
}