bufferpool/controller_scheduler_policy.go at main · arcoris/bufferpool · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
/*
  Copyright 2026 The ARCORIS Authors

  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 bufferpool

import "time"

// controller_scheduler_policy.go owns the small internal diff vocabulary used
// by PoolPartition and PoolGroup policy publication. It describes whether an
// already-validated scheduler policy needs owner-local runtime reconfiguration;
// it does not start or stop schedulers by itself.

type schedulerPolicyChangeKind uint8

const (
	schedulerPolicyChangeNone schedulerPolicyChangeKind = iota
	schedulerPolicyChangeEnable
	schedulerPolicyChangeDisable
	schedulerPolicyChangeRetime
)

const (
	schedulerPolicyChangeLabelNone    = "none"
	schedulerPolicyChangeLabelEnable  = "enable"
	schedulerPolicyChangeLabelDisable = "disable"
	schedulerPolicyChangeLabelRetime  = "retime"
)

type schedulerPolicyChange struct {
	Kind schedulerPolicyChangeKind

	PreviousEnabled  bool
	PreviousInterval time.Duration
	NextEnabled      bool
	NextInterval     time.Duration
}

func (c schedulerPolicyChange) label() string {
	switch c.Kind {
	case schedulerPolicyChangeEnable:
		return schedulerPolicyChangeLabelEnable
	case schedulerPolicyChangeDisable:
		return schedulerPolicyChangeLabelDisable
	case schedulerPolicyChangeRetime:
		return schedulerPolicyChangeLabelRetime
	default:
		return schedulerPolicyChangeLabelNone
	}
}

func classifyControllerSchedulerPolicyChange(
	previousEnabled bool,
	previousInterval time.Duration,
	nextEnabled bool,
	nextInterval time.Duration,
) schedulerPolicyChange {
	change := schedulerPolicyChange{
		PreviousEnabled:  previousEnabled,
		PreviousInterval: previousInterval,
		NextEnabled:      nextEnabled,
		NextInterval:     nextInterval,
	}

	switch {
	case !previousEnabled && nextEnabled:
		change.Kind = schedulerPolicyChangeEnable
	case previousEnabled && !nextEnabled:
		change.Kind = schedulerPolicyChangeDisable
	case previousEnabled && nextEnabled && previousInterval != nextInterval:
		change.Kind = schedulerPolicyChangeRetime
	default:
		change.Kind = schedulerPolicyChangeNone
	}

	return change
}

func classifyPartitionSchedulerPolicyChange(
	previous PartitionControllerPolicy,
	next PartitionControllerPolicy,
) schedulerPolicyChange {
	previous = PartitionPolicy{Controller: previous}.Normalize().Controller
	next = PartitionPolicy{Controller: next}.Normalize().Controller

	return classifyControllerSchedulerPolicyChange(
		previous.Enabled,
		previous.TickInterval,
		next.Enabled,
		next.TickInterval,
	)
}

func classifyGroupSchedulerPolicyChange(
	previous PoolGroupCoordinatorPolicy,
	next PoolGroupCoordinatorPolicy,
) schedulerPolicyChange {
	previous = PoolGroupPolicy{Coordinator: previous}.Normalize().Coordinator
	next = PoolGroupPolicy{Coordinator: next}.Normalize().Coordinator

	return classifyControllerSchedulerPolicyChange(
		previous.Enabled,
		previous.TickInterval,
		next.Enabled,
		next.TickInterval,
	)
}

func (c schedulerPolicyChange) needsPreparedStart() bool {
	return c.Kind == schedulerPolicyChangeEnable || c.Kind == schedulerPolicyChangeRetime
}