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grab.go
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grab.go
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package periodic
import (
"bytes"
"container/list"
"fmt"
"sync"
)
type grabItem struct {
w *worker
msgID []byte
}
func (item grabItem) has(Func string) bool {
for _, F := range item.w.funcs {
if F == Func {
return true
}
}
return false
}
func (item grabItem) equal(item1 grabItem) bool {
if item1.w == item.w && bytes.Equal(item.msgID, item1.msgID) {
return true
}
return false
}
type grabQueue struct {
list *list.List
locker *sync.Mutex
}
func (g *grabQueue) push(item grabItem) {
defer g.locker.Unlock()
g.locker.Lock()
g.list.PushBack(item)
}
func (g *grabQueue) get(Func string) (item grabItem, err error) {
defer g.locker.Unlock()
g.locker.Lock()
for e := g.list.Front(); e != nil; e = e.Next() {
item = e.Value.(grabItem)
if item.has(Func) {
return
}
}
err = fmt.Errorf("func name: %s not found", Func)
return
}
func (g *grabQueue) remove(item grabItem) {
defer g.locker.Unlock()
g.locker.Lock()
for e := g.list.Front(); e != nil; e = e.Next() {
item1 := e.Value.(grabItem)
if item.equal(item1) {
g.list.Remove(e)
}
}
}
func (g *grabQueue) removeWorker(w *worker) {
defer g.locker.Unlock()
g.locker.Lock()
for e := g.list.Front(); e != nil; e = e.Next() {
item := e.Value.(grabItem)
if item.w == w {
g.list.Remove(e)
}
}
}
func (g grabQueue) len() int {
defer g.locker.Unlock()
g.locker.Lock()
return g.list.Len()
}
func newGrabQueue() *grabQueue {
g := new(grabQueue)
g.list = list.New()
g.locker = new(sync.Mutex)
return g
}