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https://github.com/gravitational/teleport.git
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50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package utils
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import "sync/atomic"
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// RoundRobin is a helper for distributing load across multiple resources in a round-robin
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// fashion.
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type RoundRobin[T any] struct {
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ct atomic.Uint64
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items []T
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}
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// NewRoundRobin creates a new round-robin inst
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func NewRoundRobin[T any](items []T) *RoundRobin[T] {
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return &RoundRobin[T]{
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items: items,
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}
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}
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// Next gets the next item that is up for use.
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func (r *RoundRobin[T]) Next() T {
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n := r.ct.Add(1) - 1
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l := uint64(len(r.items))
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return r.items[int(n%l)]
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}
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// ForEach applies the supplied closure to each item.
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func (r *RoundRobin[T]) ForEach(fn func(T)) {
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for _, item := range r.items {
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fn(item)
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}
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}
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