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limiter.go
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limiter.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 limiter
import (
"fmt"
)
var ErrReachLimitation = fmt.Errorf("reach limitation")
var (
Verbose = false
)
const (
HillClimbingLimiter = iota
)
type Limiter interface {
Inflight() uint64
Remaining() uint64
// Acquire inspects the current status of the system:
// - if reaches the limitation, reject the request immediately.
// - if not, grant this request and return an Updater defined below.
Acquire() (Updater, error)
}
type Updater interface {
// DoUpdate is called once an invocation is finished, it tells Updater that the invocation is finished, and please
// update the Remaining, Inflight parameters of the Limiter.
DoUpdate() error
}