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ring_manager.go
68 lines (59 loc) · 1.17 KB
/
ring_manager.go
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package anet
import (
"errors"
"sync/atomic"
)
func newDefaultRingManager(n int) *manager {
ringmanager := &manager{}
ringmanager.numLoops = n
ringmanager.balance = &roundRobinLB{}
err := ringmanager.Run()
if err != nil {
panic("should't failed here")
}
return ringmanager
}
type roundRobinLB struct {
rings []Ring
lastpicked int32
}
func (b *roundRobinLB) Pick() (ring Ring) {
if len(b.rings) == 0 {
return nil
}
index := int(atomic.AddInt32(&b.lastpicked, 1)) % len(b.rings)
return b.rings[index]
}
func (b *roundRobinLB) Rebalance(rings []Ring) {
b.rings = rings
b.lastpicked = 0
}
var RingManager *manager
type manager struct {
numLoops int
rings []Ring
balance LoadBalance
}
func (m *manager) Pick() Ring {
return m.balance.Pick()
}
func (m *manager) Run() error {
var errs []error
var rings []Ring
for index := 0; index < m.numLoops; index++ {
ring, err := newDefaultRing()
if err != nil {
errs = append(errs, err)
log.Warnf("error occurred while open ring")
} else {
go func() {
_ = ring.Wait()
}()
rings = append(rings, ring)
}
}
m.rings = rings
m.balance.Rebalance(m.rings)
err := errors.Join(errs...)
return err
}