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fillmethod.go
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fillmethod.go
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// Copyright 2022 Intel Corporation. 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 balloons
import (
"bytes"
"encoding/json"
"fmt"
)
// FillMethod specifies the order in which balloon instances should be filled.
type FillMethod int
const (
FillUnspecified FillMethod = iota
// FillBalanced: put a container into the balloon with most
// free CPU without changing the size of the balloon.
FillBalanced
// FillBalancedInflate: put a container into the balloon with
// most free CPU when the balloon is inflated to the maximum
// size.
FillBalancedInflate
// FillPacked: put a container into a balloon so that it
// minimizes the amount of currently unused CPUs in the
// balloon.
FillPacked
// FillPackedInflate: put a container into a balloon so that
// it minimizes the amount of unused CPUs if the balloon is
// inflated to the maximum size.
FillPackedInflate
// FillSameGroup: put a container into a balloon with other
// containers that share the same evaluated GroupBy expression
// result, that is, the same group.
FillSameGroup
// FillSameNamespace: put a container into a balloon that already
// includes another container from the same namespace
FillSameNamespace
// FillSamePod: put a container into a balloon that already
// includes another container from the same pod.
FillSamePod
// FillNewBalloon: create a new balloon, if possible, and put
// a container into it.
FillNewBalloon
// FillNewBalloonMust: create a new balloon for a container,
// but refuse to run the container if the balloon cannot be
// created.
FillNewBalloonMust
)
var fillMethodNames = map[FillMethod]string{
FillUnspecified: "unspecified",
FillBalanced: "balanced",
FillBalancedInflate: "balanced-inflate",
FillPacked: "packed",
FillPackedInflate: "packed-inflate",
FillSameGroup: "same-group",
FillSameNamespace: "same-namespace",
FillSamePod: "same-pod",
FillNewBalloon: "new-balloon",
FillNewBalloonMust: "new-balloon-must",
}
// String stringifies a FillMethod
func (fm FillMethod) String() string {
if fmn, ok := fillMethodNames[fm]; ok {
return fmn
}
return fmt.Sprintf("#UNNAMED-FILLMETHOD(%d)", int(fm))
}
// MarshalJSON marshals a FillMethod as a quoted json string
func (fm FillMethod) MarshalJSON() ([]byte, error) {
buffer := bytes.NewBufferString(fmt.Sprintf("%q", fm))
return buffer.Bytes(), nil
}
// UnmarshalJSON unmarshals a FillMethod quoted json string to the enum value
func (fm *FillMethod) UnmarshalJSON(b []byte) error {
var fillMethodName string
err := json.Unmarshal(b, &fillMethodName)
if err != nil {
return err
}
for fmID, fmName := range fillMethodNames {
if fmName == fillMethodName {
*fm = fmID
return nil
}
}
return balloonsError("invalid fill method %q", fillMethodName)
}