beiwei30 commented on a change in pull request #708:
URL: https://github.com/apache/dubbo-go/pull/708#discussion_r472222779
##########
File path: cluster/router/chain/chain.go
##########
@@ -79,6 +104,100 @@ 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 {
+ ticker := time.NewTicker(timeInterval)
+ select {
+ case <-ticker.C:
+ 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 := make([]router.PriorityRouter, 0, len(c.routers))
+ ret = append(ret, c.routers...)
+ return ret
+}
+
+// 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 := make([]protocol.Invoker, 0, len(c.invokers))
+ ret = append(ret, c.invokers...)
+ return ret
+}
+
+// loadCache loads cache from sync.Value to guarantee the visibility
+func (c *RouterChain) loadCache() *InvokerCache {
+ v := c.cache.Load()
+ if v == nil {
+ return nil
+ }
+
+ return v.(*InvokerCache)
+}
+
+// buildCache builds address cache with the new invokers for all poolable
routers.
+func (c *RouterChain) buildCache() {
+ invokers := c.copyInvokers()
+ if invokers == nil || len(c.invokers) == 0 {
+ return
+ }
+
+ cache := BuildCache(invokers)
+ origin := c.loadCache()
+
+ var mutex sync.Mutex
+ var wg sync.WaitGroup
Review comment:
done.
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