// Responsehandler provides generic response handling
func GetResponse(msg gotocol.Message, name string, listener chan gotocol.Message, requestor *map[string]gotocol.Routetype) {
	ctr := msg.Ctx.Route()
	r := (*requestor)[ctr]
	if r.ResponseChan != nil {
		outmsg := gotocol.Message{gotocol.GetResponse, listener, time.Now(), r.Ctx, msg.Intention}
		flow.AnnotateSend(outmsg, name)
		outmsg.GoSend(r.ResponseChan)
		delete(*requestor, ctr)
	}
}

func Put(msg gotocol.Message, name string, listener chan gotocol.Message, requestor *map[string]gotocol.Routetype, microservices *map[string]chan gotocol.Message, microindex *map[int]chan gotocol.Message) {
	if len(*microservices) > 0 {
		if len(*microindex) != len(*microservices) {
			// rebuild index
			i := 0
			for _, ch := range *microservices {
				(*microindex)[i] = ch
				i++
			}
		}
		m := rand.Intn(len(*microservices))
		// pass on request to a random service - client send
		outmsg := gotocol.Message{gotocol.Put, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
		flow.AnnotateSend(outmsg, name)
		outmsg.GoSend((*microindex)[m])
	}
}

func GetRequest(msg gotocol.Message, name string, listener chan gotocol.Message, requestor *map[string]gotocol.Routetype, microservices *map[string]chan gotocol.Message, microindex *map[int]chan gotocol.Message) {
	if len(*microservices) > 0 {
		if len(*microindex) != len(*microservices) {
			// rebuild index
			i := 0
			for _, ch := range *microservices {
				(*microindex)[i] = ch
				i++
			}
		}
		m := rand.Intn(len(*microservices))
		// pass on request to a random service - client send
		outmsg := gotocol.Message{gotocol.GetRequest, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
		flow.AnnotateSend(outmsg, name)
		(*requestor)[outmsg.Ctx.Route()] = msg.Route() // remember where to respond to when this span comes back
		outmsg.GoSend((*microindex)[m])
	}
}

// Start store, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message)
	dependencies := make(map[string]time.Time) // dependent services and time last updated
	store := make(map[string]string, 4)        // key value store
	store["why?"] = "because..."
	var netflixoss chan gotocol.Message                // remember creator and how to talk back to incoming requests
	var name string                                    // remember my name
	eureka := make(map[string]chan gotocol.Message, 3) // service registry per zone
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	for {
		select {
		case msg := <-listener:
			flow.Instrument(msg, name, hist)
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					netflixoss = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention          // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				eureka[msg.Intention] = handlers.Inform(msg, name, listener)
			case gotocol.NameDrop: // cross zone = true
				handlers.NameDrop(&dependencies, &microservices, msg, name, listener, eureka, true)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, &microservices, msg)
			case gotocol.GetRequest:
				// return any stored value for this key
				outmsg := gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx, store[msg.Intention]}
				flow.AnnotateSend(outmsg, name)
				outmsg.GoSend(msg.ResponseChan)
			case gotocol.GetResponse:
				// return path from a request, send payload back up (not currently used)
			case gotocol.Put:
				// set a key value pair and replicate globally
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				if key != "" && value != "" {
					store[key] = value
					// duplicate the request on to all connected store nodes
					if len(microservices) > 0 {
						// replicate request
						for _, c := range microservices {
							outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
							flow.AnnotateSend(outmsg, name)
							outmsg.GoSend(c)
						}
					}
				}
			case gotocol.Replicate:
				// Replicate is only used between store nodes
				// end point for a request
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				// log.Printf("store: %v:%v", key, value)
				if key != "" && value != "" {
					store[key] = value
				}
				// name looks like: netflixoss.us-east-1.zoneC.mysql.store.mysql1
				myregion := names.Region(name)
				//log.Printf("%v: %v\n", name, myregion)
				// find if this was a cross region Replicate
				for n, c := range microservices {
					// find the name matching incoming request channel
					if c == msg.ResponseChan {
						if myregion != names.Region(n) {
							// Replicate from out of region needs to be Replicated only to other zones in this Region
							for nz, cz := range microservices {
								if myregion == names.Region(nz) {
									//log.Printf("%v rep to: %v\n", name, nz)
									outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
									flow.AnnotateSend(outmsg, name)
									outmsg.GoSend(cz)
								}
							}
						}
					}
				}
			case gotocol.Goodbye:
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(netflixoss)
				return
			}
		case <-eurekaTicker.C: // check to see if any new dependencies have appeared
			for dep, _ := range dependencies {
				for _, ch := range eureka {
					ch <- gotocol.Message{gotocol.GetRequest, listener, time.Now(), gotocol.NilContext, dep}
				}
			}
		}
	}
}

// Start priamCassandra, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message)
	// track the hash values owned by each node in the ring
	var ring ByToken
	dependencies := make(map[string]time.Time) // dependent services and time last updated
	store := make(map[string]string, 4)        // key value store
	store["why?"] = "because..."
	var parent chan gotocol.Message                                          // remember how to talk back to creator
	var name string                                                          // remember my name
	eureka := make(map[string]chan gotocol.Message, 3*archaius.Conf.Regions) // service registry per zone and region
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	for {
		select {
		case msg := <-listener:
			flow.Instrument(msg, name, hist)
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					parent = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention      // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				eureka[msg.Intention] = handlers.Inform(msg, name, listener)
			case gotocol.NameDrop: // cross zone = true
				handlers.NameDrop(&dependencies, &microservices, msg, name, listener, eureka, true)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, &microservices, msg)
			case gotocol.Chat:
				// Gossip setup notification of hash values for nodes, cass1:123,cass2:456
				ring = RingConfig(msg.Intention)
			case gotocol.GetRequest:
				// see if the data is stored on this node
				i := ring.Find(ringHash(msg.Intention))
				//log.Printf("%v: %v %v\n", name, i, ringHash(msg.Intention))
				if len(ring) == 0 || ring[i].name == name { // ring is setup so only respond if this is the right place
					// return any stored value for this key (Cassandra READ.ONE behavior)
					outmsg := gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx, store[msg.Intention]}
					flow.AnnotateSend(outmsg, name)
					outmsg.GoSend(msg.ResponseChan)
				} else {
					// forward the message to the right place, but don't change the ResponseChan or span
					outmsg := gotocol.Message{gotocol.GetRequest, msg.ResponseChan, time.Now(), msg.Ctx.AddSpan(), msg.Intention}
					flow.AnnotateSend(outmsg, name)
					outmsg.GoSend(microservices[ring[i].name])
				}
			case gotocol.GetResponse:
				// return path from a request, send payload back up, not used by priamCassandra currently
			case gotocol.Put:
				// set a key value pair and replicate globally
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				if key != "" && value != "" {
					i := ring.Find(ringHash(key))
					if len(ring) == 0 || ring[i].name == name { // ring is setup so only store if this is the right place
						store[key] = value
					} else {
						// forward the message to the right place, but don't change the ResponseChan or context parent
						outmsg := gotocol.Message{gotocol.Put, msg.ResponseChan, time.Now(), msg.Ctx.AddSpan(), msg.Intention}
						flow.AnnotateSend(outmsg, name)
						outmsg.GoSend(microservices[ring[i].name])
					}
					// duplicate the request on to priamCassandra nodes in each zone and one in each region
					for _, z := range names.OtherZones(name, archaius.Conf.ZoneNames) {
						// replicate request
						for n, c := range microservices {
							if names.Region(n) == names.Region(name) && names.Zone(n) == z {
								outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
								flow.AnnotateSend(outmsg, name)
								outmsg.GoSend(c)
								break // only need to send it to one node in each zone
							}
						}
					}
					for _, r := range names.OtherRegions(name, archaius.Conf.RegionNames[0:archaius.Conf.Regions]) {
						for n, c := range microservices {
							if names.Region(n) == r {
								outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
								flow.AnnotateSend(outmsg, name)
								outmsg.GoSend(c)
								break // only need to send it to one node in each region
							}
						}
					}
				}
			case gotocol.Replicate:
				// Replicate is only used between priamCassandra nodes
				// end point for a request
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				// log.Printf("priamCassandra: %v:%v", key, value)
				if key != "" && value != "" {
					i := ring.Find(ringHash(key))
					if len(ring) == 0 || ring[i].name == name { // ring is setup so only store if this is the right place
//.........这里部分代码省略.........

// Start the denominator, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 6 // starting point for how many nodes to remember
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message, dunbar)
	microindex := make([]chan gotocol.Message, dunbar)
	dependencies := make(map[string]time.Time, dunbar)                       // dependent services and time last updated
	var parent chan gotocol.Message                                          // remember how to talk back to creator
	var name string                                                          // remember my name
	hist := collect.NewHist("")                                              // don't know name yet
	eureka := make(map[string]chan gotocol.Message, 3*archaius.Conf.Regions) // service registry per zone and region
	var chatrate time.Duration
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	w := 1 // counter for random messages
	for {
		select {
		case msg := <-listener:
			flow.Instrument(msg, name, hist)
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					parent = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention      // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				eureka[msg.Intention] = gotocol.InformHandler(msg, name, listener)
			case gotocol.NameDrop:
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka)
			case gotocol.Forget:
				// forget a buddy
				gotocol.ForgetHandler(&dependencies, &microservices, msg)
			case gotocol.Chat:
				// setup the ticker to run at the specified rate
				d, e := time.ParseDuration(msg.Intention)
				if e == nil && d >= time.Millisecond && d <= time.Hour {
					chatrate = d
					chatTicker = time.NewTicker(chatrate)
				}
			case gotocol.GetResponse:
				// return path from a request, terminate and log
				flow.End(msg.Ctx)
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, was chatting every %v\n", name, chatrate)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(parent)
				return
			}
		case <-eurekaTicker.C: // check to see if any new dependencies have appeared
			for dep, _ := range dependencies {
				for _, ch := range eureka {
					ch <- gotocol.Message{gotocol.GetRequest, listener, time.Now(), gotocol.NilContext, dep}
				}
			}
		case <-chatTicker.C:
			if len(microservices) > 0 {
				// build index if needed
				if len(microindex) != len(microservices) {
					i := 0
					for _, ch := range microservices {
						microindex[i] = ch
						i++
					}
				}
				m := rand.Intn(len(microservices))
				// start a request to a random member of this denominator
				ctx := gotocol.NewTrace()
				now := time.Now()
				var sm gotocol.Message
				switch rand.Intn(3) {
				case 0:
					sm = gotocol.Message{gotocol.GetRequest, listener, now, ctx, "why?"}
				case 1:
					q := rand.Intn(w) // pick a random key that has already been put
					sm = gotocol.Message{gotocol.GetRequest, listener, now, ctx, fmt.Sprintf("Why%v%v", q, q*q)}
				case 2:
					sm = gotocol.Message{gotocol.Put, listener, now, ctx, fmt.Sprintf("Why%v%v me", w, w*w)}
					w++ // put a new key each time
				}
				flow.Annotate(sm, "ss", name, now) // service send logs creation time for this flow
				sm.GoSend(microindex[m])
			}
		}
	}
}