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mem_control.go
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/
mem_control.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// 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 msq
import (
"sync"
"time"
"github.com/secretflow/kuscia/pkg/utils/nlog"
"gitlab.com/jonas.jasas/condchan"
)
type MemControl struct {
totalByteSizeLimit uint64
totalByteSize uint64
sync.Mutex
notFull *condchan.CondChan
}
func NewMemControl(config *Config) *MemControl {
mc := &MemControl{
totalByteSizeLimit: config.TotalByteSizeLimit,
totalByteSize: 0,
Mutex: sync.Mutex{},
}
mc.notFull = condchan.New(&mc.Mutex)
return mc
}
func (mc *MemControl) Prefetch(byteSize uint64, timeout time.Duration) (bool, time.Duration) {
leftTimeout := timeout
mc.Lock()
available := mc.availableToPush(byteSize)
if !available {
if byteSize > mc.totalByteSizeLimit {
nlog.Warnf("input body size(%d) max than maxByteLimit(%d), so skip it", byteSize, mc.totalByteSizeLimit)
return false, leftTimeout
}
start := time.Now()
timeCh := time.After(timeout)
waitTimeout := false
for {
mc.notFull.Select(func(i <-chan struct{}) {
select {
case <-i:
case <-timeCh:
waitTimeout = true
}
})
if waitTimeout {
break
}
if available = mc.availableToPush(byteSize); available {
usedTime := time.Now().Sub(start)
if leftTimeout > usedTime {
leftTimeout -= usedTime
} else {
leftTimeout = 0
}
break
}
}
}
defer mc.Unlock()
if !available || leftTimeout == 0 {
return false, leftTimeout
}
mc.totalByteSize += byteSize
return true, leftTimeout
}
func (mc *MemControl) Release(byteSize uint64) {
mc.Lock()
mc.totalByteSize -= byteSize
mc.Unlock()
mc.notFull.Signal()
}
func (mc *MemControl) availableToPush(byteSize uint64) bool {
return mc.totalByteSize+byteSize <= mc.totalByteSizeLimit
}