/
multi_reservation_impl.go
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/
multi_reservation_impl.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package quotas
import (
"time"
)
type (
MultiReservationImpl struct {
ok bool
reservations []Reservation
}
)
var _ Reservation = (*MultiReservationImpl)(nil)
func NewMultiReservation(
ok bool,
reservations []Reservation,
) *MultiReservationImpl {
if ok && len(reservations) == 0 {
panic("expect at least one reservation")
}
return &MultiReservationImpl{
ok: ok,
reservations: reservations,
}
}
// OK returns whether the limiter can provide the requested number of tokens
func (r *MultiReservationImpl) OK() bool {
return r.ok
}
// Cancel indicates that the reservation holder will not perform the reserved action
// and reverses the effects of this Reservation on the rate limit as much as possible
func (r *MultiReservationImpl) Cancel() {
r.CancelAt(time.Now())
}
// CancelAt indicates that the reservation holder will not perform the reserved action
// and reverses the effects of this Reservation on the rate limit as much as possible
func (r *MultiReservationImpl) CancelAt(now time.Time) {
if !r.ok {
return
}
for _, reservation := range r.reservations {
reservation.CancelAt(now)
}
}
// Delay returns the duration for which the reservation holder must wait
// before taking the reserved action. Zero duration means act immediately.
func (r *MultiReservationImpl) Delay() time.Duration {
return r.DelayFrom(time.Now())
}
// DelayFrom returns the duration for which the reservation holder must wait
// before taking the reserved action. Zero duration means act immediately.
func (r *MultiReservationImpl) DelayFrom(now time.Time) time.Duration {
if !r.ok {
return InfDuration
}
result := r.reservations[0].DelayFrom(now)
for _, reservation := range r.reservations {
duration := reservation.DelayFrom(now)
if result < duration {
result = duration
}
}
return result
}