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unary_snowball.go
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unary_snowball.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package snowball
import (
"fmt"
"slices"
)
var _ Unary = (*unarySnowball)(nil)
func newUnarySnowball(alphaPreference int, terminationConditions []terminationCondition) unarySnowball {
return unarySnowball{
unarySnowflake: newUnarySnowflake(alphaPreference, terminationConditions),
}
}
// unarySnowball is the implementation of a unary snowball instance
type unarySnowball struct {
// wrap the unary snowflake logic
unarySnowflake
// preferenceStrength tracks the total number of polls with a preference
preferenceStrength int
}
func (sb *unarySnowball) RecordPoll(count int) {
if count >= sb.alphaPreference {
sb.preferenceStrength++
}
sb.unarySnowflake.RecordPoll(count)
}
func (sb *unarySnowball) Extend(choice int) Binary {
bs := &binarySnowball{
binarySnowflake: binarySnowflake{
binarySlush: binarySlush{preference: choice},
confidence: slices.Clone(sb.confidence),
alphaPreference: sb.alphaPreference,
terminationConditions: sb.terminationConditions,
finalized: sb.Finalized(),
},
preference: choice,
}
bs.preferenceStrength[choice] = sb.preferenceStrength
return bs
}
func (sb *unarySnowball) Clone() Unary {
newSnowball := *sb
newSnowball.confidence = slices.Clone(sb.confidence)
return &newSnowball
}
func (sb *unarySnowball) String() string {
return fmt.Sprintf("SB(PreferenceStrength = %d, %s)",
sb.preferenceStrength,
&sb.unarySnowflake)
}