/
fifo.go
61 lines (51 loc) · 1.25 KB
/
fifo.go
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// Copyright 2019 Yunion
//
// 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 lockman
import (
"container/list"
"yunion.io/x/log"
)
type FIFO struct {
fifo *list.List
}
func NewFIFO() *FIFO {
return &FIFO{fifo: list.New()}
}
func (f *FIFO) Push(ele interface{}) {
f.fifo.PushBack(ele)
}
func (f *FIFO) Pop(ele interface{}) interface{} {
e := f.fifo.Front()
for e != nil && e.Value != ele {
e = e.Next()
}
if e != nil {
v := f.fifo.Remove(e)
if v != ele {
log.Fatalf("remove element not identical!!")
}
}
return nil
}
func (f *FIFO) Len() int {
return f.fifo.Len()
}
type ElementInspectFunc func(ele interface{})
func (f *FIFO) Enum(eif ElementInspectFunc) {
e := f.fifo.Front()
for e != nil {
eif(e.Value)
e = e.Next()
}
}