beiwei30 commented on a change in pull request #708:
URL: https://github.com/apache/dubbo-go/pull/708#discussion_r471946477
##########
File path: cluster/router/chain/chain.go
##########
@@ -79,6 +105,104 @@ func (c *RouterChain) AddRouters(routers
[]router.PriorityRouter) {
c.routers = newRouters
}
+// SetInvokers receives updated invokers from registry center. If the times of
notification exceeds countThreshold and
+// time interval exceeds timeThreshold since last cache update, then notify to
update the cache.
+func (c *RouterChain) SetInvokers(invokers []protocol.Invoker) {
+ c.mutex.Lock()
+ c.invokers = invokers
+ c.mutex.Unlock()
+
+ c.count++
+ now := time.Now()
+ if c.count >= countThreshold && now.Sub(c.last) >= timeThreshold {
+ c.last = now
+ c.count = 0
+ go func() {
+ c.notify <- struct{}{}
+ }()
+ }
+}
+
+// loop listens on events to update the address cache when it's necessary,
either when it receives notification
+// from address update, or when timeInterval exceeds.
+func (c *RouterChain) loop() {
+ for {
+ select {
+ case <-time.Tick(timeInterval):
+ c.buildCache()
+ case <-c.notify:
+ c.buildCache()
+ }
+ }
+}
+
+// copyRouters make a snapshot copy from RouterChain's router list.
+func (c *RouterChain) copyRouters() []router.PriorityRouter {
+ c.mutex.RLock()
+ defer c.mutex.RUnlock()
+ ret := copySlice(c.routers)
+ return ret.([]router.PriorityRouter)
+}
+
+// copyInvokers copies a snapshot of the received invokers.
+func (c *RouterChain) copyInvokers() []protocol.Invoker {
+ c.mutex.RLock()
+ defer c.mutex.RUnlock()
+ if c.invokers == nil || len(c.invokers) == 0 {
+ return nil
+ }
+ ret := copySlice(c.invokers)
+ return ret.([]protocol.Invoker)
+}
+
+func copySlice(s interface{}) interface{} {
Review comment:
done.
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