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timestamps.go
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/
timestamps.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// 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 udp
import (
"sync"
"time"
)
type timestamps struct {
position int
mu sync.RWMutex
items []time.Time
}
func newTimestamps(count int) *timestamps {
return ×tamps{
items: make([]time.Time, count),
}
}
// Append adds new timestamp and returns oldest.
func (i *timestamps) Append(val time.Time) time.Time {
i.mu.Lock()
defer i.mu.Unlock()
result := i.items[i.position]
i.items[i.position] = val
i.position = (i.position + 1) % len(i.items)
return result
}