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control.go
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control.go
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// Copyright 2022 iLogtail 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 ilogtail
import "sync"
// AsyncControl is an asynchronous execution control that can be canceled.
type AsyncControl struct {
cancelToken chan struct{}
wg sync.WaitGroup
}
// CancelToken returns a readonly channel that can be subscribed to as a cancel token
func (p *AsyncControl) CancelToken() <-chan struct{} {
return p.cancelToken
}
func (p *AsyncControl) Notify() {
p.cancelToken <- struct{}{}
}
// Reset cancel channal
func (p *AsyncControl) Reset() {
if p.cancelToken == nil {
p.cancelToken = make(chan struct{}, 1)
}
}
// Run function as a Task
func (p *AsyncControl) Run(task func(*AsyncControl)) {
p.wg.Add(1)
go func(cc *AsyncControl, fn func(*AsyncControl)) {
defer cc.wg.Done()
fn(cc)
}(p, task)
}
// Waiting for executing task to be canceled
func (p *AsyncControl) WaitCancel() {
close(p.cancelToken)
p.wg.Wait()
p.cancelToken = nil
}
func NewAsyncControl() *AsyncControl {
return &AsyncControl{
cancelToken: make(chan struct{}, 1),
}
}