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notify.go
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notify.go
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/*
* Copyright The Dragonfly 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 common
import (
"fmt"
"sync"
"github.com/dragonflyoss/Dragonfly/dfget/corev2/basic"
)
// NewNotify creates Notify which implements basic.Notify.
func NewNotify() *Notify {
return &Notify{}
}
// Notify is an implementation of basic.Notify.
type Notify struct {
sync.RWMutex
done chan struct{}
result basic.NotifyResult
}
func (notify *Notify) Done() <-chan struct{} {
return notify.done
}
// Result returns the NotifyResult and only valid after Done channel is closed.
func (notify *Notify) Result() basic.NotifyResult {
notify.RLock()
defer notify.RUnlock()
return notify.result
}
// Finish sets result and close done channel to notify work done.
func (notify *Notify) Finish(result basic.NotifyResult) error {
notify.Lock()
defer notify.Unlock()
if notify.result != nil {
return fmt.Errorf("result have been set once")
}
notify.result = result
close(notify.done)
return nil
}
// NotifyResult is an implementation of basic.NotifyResult.
type notifyResult struct {
success bool
err error
data interface{}
}
func NewNotifyResult(success bool, err error, data interface{}) basic.NotifyResult {
return ¬ifyResult{
success: success,
err: err,
data: data,
}
}
func (nr notifyResult) Success() bool {
return nr.success
}
func (nr notifyResult) Error() error {
return nr.err
}
func (nr notifyResult) Data() interface{} {
return nr.data
}