mirror of
https://github.com/cubefs/cubefs.git
synced 2026-08-02 10:06:14 +00:00
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
// Copyright 2023 The CubeFS Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package flowctrl
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import (
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"sync"
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)
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type ctrlWrapper struct {
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c *Controller
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refCount int
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}
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func newCtrlWrapper(rate int) *ctrlWrapper {
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return &ctrlWrapper{
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c: NewController(rate),
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refCount: 0,
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}
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}
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type KeyFlowCtrl struct {
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mutex sync.RWMutex
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current map[string]*ctrlWrapper // uid -> controller
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}
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func NewKeyFlowCtrl() *KeyFlowCtrl {
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return &KeyFlowCtrl{current: make(map[string]*ctrlWrapper)}
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}
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func (k *KeyFlowCtrl) Acquire(key string, rate int) *Controller {
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k.mutex.Lock()
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ctrl, ok := k.current[key]
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if !ok {
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ctrl = newCtrlWrapper(rate)
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k.current[key] = ctrl
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}
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ctrl.refCount++
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k.mutex.Unlock()
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return ctrl.c
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}
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func (k *KeyFlowCtrl) Release(key string) {
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k.mutex.Lock()
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defer k.mutex.Unlock()
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ctrl, ok := k.current[key]
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if !ok {
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panic("key not in map. Possible reason: Release without Acquire.")
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}
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ctrl.refCount--
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if ctrl.refCount < 0 {
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panic("internal error: refs < 0")
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}
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if ctrl.refCount == 0 {
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ctrl.c.Close() // avoid goroutine leak
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delete(k.current, key)
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}
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}
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