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tick.go
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tick.go
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// Copyright 2019 Anapaya Systems
//
// 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 beaconing
import (
"time"
)
// Tick keeps track whether the period has passed compared to the last time.
//
// If the Tick's clock has never been set, its value is the default Go time.Time.
type Tick struct {
now time.Time
last time.Time
period time.Duration
}
func NewTick(period time.Duration) Tick {
return Tick{period: period}
}
func (t *Tick) SetNow(now time.Time) {
t.now = now
}
func (t *Tick) Now() time.Time {
return t.now
}
// Overdue returns true if the Tick's period has elapsed since timestamp in the
// past up to the Tick's Now time.
func (t *Tick) Overdue(timestamp time.Time) bool {
return t.now.Sub(timestamp) > t.period
}
func (t *Tick) Period() time.Duration {
return t.period
}
// UpdateLast updates the last time to the current time, if the period has
// passed since last.
func (t *Tick) UpdateLast() {
if t.Passed() {
t.last = t.now
}
}
// Passed returns true if the Tick's period has elapsed since the last UpdateLast call up to
// the Tick's Now time.
func (t *Tick) Passed() bool {
return t.now.Sub(t.last) >= t.period
}