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nginx-sso/vendor/google.golang.org/grpc/balancer/xds/edsbalancer/util.go
Knut Ahlers 9b3c895c04
Update dependencies
Signed-off-by: Knut Ahlers <knut@ahlers.me>
2019-04-22 06:44:07 +02:00

58 lines
1.2 KiB
Go

// +build go1.12
/*
* Copyright 2019 gRPC authors.
*
* 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 edsbalancer
import (
"sync"
)
type dropper struct {
// Drop rate will be numerator/denominator.
numerator uint32
denominator uint32
mu sync.Mutex
i uint32
}
func newDropper(numerator, denominator uint32) *dropper {
return &dropper{
numerator: numerator,
denominator: denominator,
}
}
func (d *dropper) drop() (ret bool) {
d.mu.Lock()
defer d.mu.Unlock()
// TODO: the drop algorithm needs a design.
// Currently, for drop rate 3/5:
// 0 1 2 3 4
// d d d n n
if d.i < d.numerator {
ret = true
}
d.i++
if d.i >= d.denominator {
d.i = 0
}
return
}