// Terminate a flow, flushing output and freeing the request id to keep the map smaller
func End(msg gotocol.Message, resphist, servhist, rthist metrics.Histogram) {
	if !archaius.Conf.Collect {
		return
	}
	var cs, sr, ss, cr int64
	// find the annotations for the client send time and the client receive time
	for _, a := range flowmap[msg.Ctx.Trace] {
		if a.Value == CS.String() {
			cs = a.Timestamp
		}
		if a.Value == SR.String() {
			sr = a.Timestamp
		}
		if a.Value == SS.String() {
			ss = a.Timestamp
		}
		if a.Value == CR.String() {
			cr = a.Timestamp
		}
	}
	if cs > 0 && cr > 0 { // response time measured at the client
		collect.Measure(resphist, time.Unix(0, cr).Sub(time.Unix(0, cs)))
	}
	if ss > 0 && sr > 0 { // service time measured at the server
		collect.Measure(servhist, time.Unix(0, ss).Sub(time.Unix(0, sr)))
	}
	if cs > 0 && cr > 0 && ss > 0 && sr > 0 { // network time sum of each direction
		collect.Measure(rthist, time.Unix(0, sr).Sub(time.Unix(0, cs))+time.Unix(0, cr).Sub(time.Unix(0, ss)))
	}
}

// Shutdown fsm and pirates
func shutdown() {
	var msg gotocol.Message
	hist := collect.NewHist("fsm")
	// wait until the delay has finished
	if archaius.Conf.RunDuration >= time.Millisecond {
		time.Sleep(archaius.Conf.RunDuration)
	}
	log.Println("fsm: Shutdown")
	for _, noodle := range noodles {
		gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext(), "beer volcano"}.GoSend(noodle)
	}
	for len(noodles) > 0 {
		msg = <-listener
		collect.Measure(hist, time.Since(msg.Sent))
		if archaius.Conf.Msglog {
			log.Printf("fsm: %v\n", msg)
		}
		switch msg.Imposition {
		case gotocol.Goodbye:
			delete(noodles, msg.Intention)
			if archaius.Conf.Msglog {
				log.Printf("fsm: Pirate population: %v    \n", len(noodles))
			}
		}
	}
	collect.Save()
	log.Println("fsm: Exit")
}

// Start edda, to listen for logging data from services
func Start(name string) {
	// use a waitgroup so whoever starts edda can tell the logs have been flushed
	Wg.Add(1)
	defer Wg.Done()
	if Logchan == nil {
		return
	}
	var msg gotocol.Message
	microservices := make(map[string]bool, archaius.Conf.Dunbar)
	edges := make(map[string]bool, archaius.Conf.Dunbar)
	var ok bool
	hist := collect.NewHist(name)
	log.Println(name + ": starting")
	if archaius.Conf.GraphmlFile != "" {
		graphml.Setup(archaius.Conf.GraphmlFile)
	}
	if archaius.Conf.GraphjsonFile != "" {
		graphjson.Enabled = true
		graphjson.Setup(archaius.Conf.GraphjsonFile)
	}
	for {
		msg, ok = <-Logchan
		collect.Measure(hist, time.Since(msg.Sent))
		if !ok {
			break // channel was closed
		}
		if archaius.Conf.Msglog {
			log.Printf("%v(backlog %v): %v\n", name, len(Logchan), msg)
		}
		switch msg.Imposition {
		case gotocol.Inform:
			edge := names.FilterEdge(msg.Intention)
			if edges[edge] == false { // only log an edge once
				edges[edge] = true
				graphml.WriteEdge(edge)
				graphjson.WriteEdge(edge, msg.Sent)
			}
		case gotocol.Put:
			node := names.FilterNode(msg.Intention)
			if microservices[node] == false { // only log a node once
				microservices[node] = true
				graphml.WriteNode(node + " " + names.Package(msg.Intention))
				graphjson.WriteNode(node+" "+names.Package(msg.Intention), msg.Sent)
			}
		case gotocol.Forget: // forget the edge
			graphjson.WriteForget(msg.Intention, msg.Sent)
		case gotocol.Delete: // remove the node
			if microservices[msg.Intention] == true { // only remove nodes that exist, and only log it once
				microservices[msg.Intention] = false
				graphjson.WriteDone(msg.Intention, msg.Sent)
			}
		}
	}
	log.Println(name + ": closing")
	graphml.Close()
	graphjson.Close()
}

// common code for instrumenting requests
func Instrument(msg gotocol.Message, name string, hist metrics.Histogram) {
	received := time.Now()
	collect.Measure(hist, received.Sub(msg.Sent))
	if archaius.Conf.Msglog {
		log.Printf("%v: %v\n", name, msg)
	}
	if msg.Ctx != gotocol.NilContext {
		AnnotateReceive(msg, name, received) // store the annotation for this request
	}
}

// common code for instrumenting requests
func Instrument(msg gotocol.Message, name string, hist *metrics.Histogram) (ann *annotationtype, span gotocol.Context) {
	received := time.Now()
	collect.Measure(hist, received.Sub(msg.Sent))
	if archaius.Conf.Msglog {
		log.Printf("%v: %v\n", name, msg)
	}
	if msg.Ctx == gotocol.NilContext {
		ann = nil
		span = gotocol.NilContext
	} else {
		ann = Annotate(msg, "sr", name, received) // annotate this request
		if ann != nil {                           // flow is enabled
			span = msg.Ctx.NewParent() // make a new context for the outbound request
		} else {
			span = gotocol.NilContext
		}
	}
	return ann, span
}

// Start the pirate, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 10 // starting point for how many buddies to remember
	// remember the channel to talk to named buddies
	buddies := make(map[string]chan gotocol.Message, dunbar)
	// remember who sent GoldCoin and how much, to buy favors
	benefactors := make(map[string]int, dunbar)
	var booty int                   // current GoldCoin balance
	var fsm chan gotocol.Message    // remember how to talk back to creator
	var name string                 // remember my name
	var logger chan gotocol.Message // if set, send updates
	var chatrate time.Duration
	hist := collect.NewHist("")
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					fsm = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention   // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				// remember where to send updates
				logger = gotocol.InformHandler(msg, name, listener)
			case gotocol.NameDrop:
				// don't remember too many buddies and don't talk to myself
				buddy := msg.Intention // message body is buddy name
				if len(buddies) < dunbar && buddy != name {
					// remember how to talk to this buddy
					buddies[buddy] = msg.ResponseChan // message channel is buddy's listener
					if logger != nil {
						// if it's setup, tell the logger I have a new buddy to talk to
						logger <- gotocol.Message{gotocol.Inform, listener, time.Now(), gotocol.NilContext, name + " " + buddy}
					}
				}
			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)
					// assume we got paid before we started chatting
					rand.Seed(int64(booty))
				}
			case gotocol.GoldCoin:
				var coin int
				_, e := fmt.Sscanf(msg.Intention, "%d", &coin)
				if e == nil && coin > 0 {
					booty += coin
					for name, ch := range buddies {
						if ch == msg.ResponseChan {
							benefactors[name] += coin
						}
					}
				}
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away with %v gold coins, chatting every %v\n", name, booty, chatrate)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(fsm)
				return
			}
		case <-chatTicker.C:
			if rand.Intn(100) < 50 { // 50% of the time
				// use Namedrop to tell the last buddy about the first
				var firstBuddyName string
				var firstBuddyChan, lastBuddyChan chan gotocol.Message
				if len(buddies) >= 2 {
					for name, ch := range buddies {
						if firstBuddyName == "" {
							firstBuddyName = name
							firstBuddyChan = ch
						} else {
							lastBuddyChan = ch
						}
						gotocol.Message{gotocol.NameDrop, firstBuddyChan, time.Now(), gotocol.NewTrace(), firstBuddyName}.GoSend(lastBuddyChan)
					}
				}
			} else {
				// send a buddy some money
				if booty > 0 {
					donation := rand.Intn(booty)
					luckyNumber := rand.Intn(len(buddies))
					if donation > 0 {
						for _, ch := range buddies {
							if luckyNumber == 0 {
								gotocol.Message{gotocol.GoldCoin, listener, time.Now(), gotocol.NewTrace(), fmt.Sprintf("%d", donation)}.GoSend(ch)
								booty -= donation
								break
							} else {
								luckyNumber--
//.........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()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			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()
				flow.Begin(ctx, name)
				if rand.Intn(2) == 0 {
					gotocol.Message{gotocol.GetRequest, listener, time.Now(), ctx, "why?"}.GoSend(microindex[m])
				} else {
					gotocol.Message{gotocol.Put, listener, time.Now(), ctx, "remember me"}.GoSend(microindex[m])
				}
			}
		}
	}
}

// Start store, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 30 // starting point for how many nodes to remember
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message, dunbar)
	dependencies := make(map[string]time.Time, dunbar) // dependent services and time last updated
	store := make(map[string]string, 4)                // key value store
	store["why?"] = "because..."
	var netflixoss, requestor 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
	var chatrate time.Duration
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			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] = gotocol.InformHandler(msg, name, listener)
			case gotocol.NameDrop: // cross zone = true
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka, true)
			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.GetRequest:
				// return any stored value for this key (Cassandra READ.ONE behavior)
				gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx.NewSpan(), store[msg.Intention]}.GoSend(msg.ResponseChan)
			case gotocol.GetResponse:
				// return path from a request, send payload back up (not currently used)
				if requestor != nil {
					gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx.NewSpan(), msg.Intention}.GoSend(requestor)
				}
			case gotocol.Put:
				requestor = msg.ResponseChan
				// 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 {
							gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewSpan(), msg.Intention}.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.cassTurtle.store.cassTurtle11
				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)
									gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewSpan(), msg.Intention}.GoSend(cz)
								}
							}
						}
					}
				}
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, zone: %v\n", name, store["zone"])
				}
//.........这里部分代码省略.........

// Start priamCassandra, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := archaius.Conf.Population // starting point for how many nodes to remember
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message, dunbar)
	// track the hash values owned by each node in the ring
	var ring ByToken
	dependencies := make(map[string]time.Time, dunbar) // 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:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			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: // cross zone = true
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka, true)
			case gotocol.Forget:
				// forget a buddy
				gotocol.ForgetHandler(&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))
				span := msg.Ctx.NewSpan()
				flow.Update(span, name)
				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)
					gotocol.Message{gotocol.GetResponse, listener, time.Now(), span, store[msg.Intention]}.GoSend(msg.ResponseChan)
				} else {
					// send the message to the right place, but don't change the ResponseChan
					gotocol.Message{gotocol.GetRequest, msg.ResponseChan, time.Now(), span, msg.Intention}.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
				span := msg.Ctx.NewSpan()
				flow.Update(span, name)
				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 {
						// send the message to the right place, but don't change the ResponseChan
						gotocol.Message{gotocol.Put, msg.ResponseChan, time.Now(), span, msg.Intention}.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 {
								gotocol.Message{gotocol.Replicate, listener, time.Now(), span, msg.Intention}.GoSend(c)
								break // only need to send it to one node in each zone, no tokens yet
							}
						}
					}
					for _, r := range names.OtherRegions(name, archaius.Conf.RegionNames[0:archaius.Conf.Regions]) {
						for n, c := range microservices {
							if names.Region(n) == r {
								gotocol.Message{gotocol.Replicate, listener, time.Now(), span, msg.Intention}.GoSend(c)
								break // only need to send it to one node in each region, no tokens yet
							}
						}
					}
				}
			case gotocol.Replicate:
				// Replicate is only used between priamCassandra nodes
				// end point for a request
				var key, value string
				span := msg.Ctx.NewSpan()
				flow.Update(span, name)
				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 monolith, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 30 // 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 netflixoss, requestor 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, 1) // service registry
	var chatrate time.Duration
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			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] = gotocol.InformHandler(msg, name, listener)
			case gotocol.NameDrop: // monolith talks cross zones, only difference from karyon
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka, true)
			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.GetRequest:
				// route the request on to microservices
				requestor = msg.ResponseChan
				// Intention body indicates which service to route to or which key to get
				// need to lookup service by type rather than randomly call one day
				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))
					// start a request to a random service
					gotocol.Message{gotocol.GetRequest, listener, time.Now(), msg.Intention}.GoSend(microindex[m])
				}
			case gotocol.GetResponse:
				// return path from a request, send payload back up
				if requestor != nil {
					gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Intention}.GoSend(requestor)
				}
			case gotocol.Put:
				// route the request on to a random dependency
				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
					gotocol.Message{gotocol.Put, listener, time.Now(), msg.Intention}.GoSend(microindex[m])
				}
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away\n", name)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), 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(), dep}
				}
			}
		case <-chatTicker.C:
			if len(microservices) > 0 {
				if len(microservices) != len(microindex) {
					// rebuild index
//.........这里部分代码省略.........

// Start eureka discovery service and set name directly
func Start(listener chan gotocol.Message, name string) {
	// use a waitgroup so whoever starts eureka can tell it's ready and when stopping that the logs have been flushed
	Wg.Add(1)
	defer Wg.Done()
	var msg gotocol.Message
	var ok bool
	hist := collect.NewHist(name)
	microservices := make(map[string]chan gotocol.Message, archaius.Conf.Dunbar)
	eurekaservices := make(map[string]chan gotocol.Message, 2)
	metadata := make(map[string]meta, archaius.Conf.Dunbar)
	lastrequest := make(map[callback]time.Time) // remember time of last request for a service from this requestor
	log.Println(name + ": starting")
	for {
		msg, ok = <-listener
		collect.Measure(hist, time.Since(msg.Sent))
		if !ok {
			break // channel was closed
		}
		if archaius.Conf.Msglog {
			log.Printf("%v(backlog %v): %v\n", name, len(listener), msg)
		}
		switch msg.Imposition {
		// used to wire up connections to other eureka nodes only
		case gotocol.NameDrop:
			if msg.Intention != name { // don't talk to myself
				eurekaservices[msg.Intention] = msg.ResponseChan
			}
		// for new nodes record the data, replicate and maybe pass on to be logged
		case gotocol.Put:
			if microservices[msg.Intention] == nil { // ignore duplicate requests
				microservices[msg.Intention] = msg.ResponseChan
				metadata[msg.Intention] = meta{true, msg.Sent}
				// replicate request, everyone ends up with the same timestamp for state change of this service
				for _, c := range eurekaservices {
					gotocol.Message{gotocol.Replicate, msg.ResponseChan, msg.Sent, msg.Intention}.GoSend(c)
				}
				if edda.Logchan != nil {
					edda.Logchan <- msg
				}
			}
		case gotocol.Replicate:
			if microservices[msg.Intention] == nil { // ignore multiple requests
				microservices[msg.Intention] = msg.ResponseChan
				metadata[msg.Intention] = meta{true, msg.Sent}
			}
		case gotocol.Inform:
			// don't store edges in discovery but do log them
			if edda.Logchan != nil {
				edda.Logchan <- msg
			}
		case gotocol.GetRequest:
			if msg.Intention == "" {
				log.Fatal(name + ": empty GetRequest")
			}
			if microservices[msg.Intention] != nil { // matched a unique full name
				gotocol.Message{gotocol.NameDrop, microservices[msg.Intention], time.Now(), msg.Intention}.GoSend(msg.ResponseChan)
				break
			}
			for n, ch := range microservices { // respond with all the online names that match the service component
				if names.Service(n) == msg.Intention {
					// if there was an update for the looked up service since last check
					// log.Printf("%v: matching %v with %v, last: %v metadata: %v\n", name, n, msg.Intention, lastrequest[callback{n, msg.ResponseChan}], metadata[n].registered)
					if metadata[n].registered.After(lastrequest[callback{n, msg.ResponseChan}]) {
						if metadata[n].online {
							gotocol.Message{gotocol.NameDrop, ch, time.Now(), n}.GoSend(msg.ResponseChan)
						} else {
							log.Printf("%v:Forget %v\n", name, n)
							gotocol.Message{gotocol.Forget, ch, time.Now(), n}.GoSend(msg.ResponseChan)
						}
					}
					// remember for next time
					lastrequest[callback{n, msg.ResponseChan}] = msg.Sent
				}
			}
		case gotocol.Delete: // remove a node
			if microservices[msg.Intention] != nil { // matched a unique full name
				metadata[msg.Intention] = meta{false, time.Now()}
				// replicate request
				for _, c := range eurekaservices {
					gotocol.Message{gotocol.Replicate, nil, time.Now(), msg.Intention}.GoSend(c)
				}
				if edda.Logchan != nil {
					edda.Logchan <- msg
				}
			}
		case gotocol.Goodbye:
			gotocol.Message{gotocol.Goodbye, nil, time.Now(), name}.GoSend(msg.ResponseChan)
			log.Println(name + ": closing")
			return
		}
	}
}

// Start the elb, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := archaius.Conf.Population
	// 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
	requestor := make(map[gotocol.TraceContextType]chan gotocol.Message) // remember where requests came from
	var name string                                                      // remember my name
	eureka := make(map[string]chan gotocol.Message, 3)                   // service registry per zone
	var chatrate time.Duration
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	hist := collect.NewHist("")
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			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: // cross zone = true
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka, true)
			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.GetRequest:
				// route the request on to microservices
				requestor[msg.Ctx.Trace] = msg.ResponseChan
				// Intention body indicates which service to route to or which key to get
				// need to lookup service by type rather than randomly call one day
				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
					span := msg.Ctx.NewSpan()
					flow.Update(span, name)
					gotocol.Message{gotocol.GetRequest, listener, time.Now(), span, msg.Intention}.GoSend(microindex[m])
				}
			case gotocol.GetResponse:
				// return path from a request, send payload back up
				if requestor[msg.Ctx.Trace] != nil {
					span := msg.Ctx.NewSpan()
					flow.Update(span, name)
					gotocol.Message{gotocol.GetResponse, listener, time.Now(), span, msg.Intention}.GoSend(requestor[msg.Ctx.Trace])
					delete(requestor, msg.Ctx.Trace)
				}
			case gotocol.Put:
				// route the request on to a random dependency
				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
					span := msg.Ctx.NewSpan()
					flow.Update(span, name)
					gotocol.Message{gotocol.Put, listener, time.Now(), span, msg.Intention}.GoSend(microindex[m])
				}
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, 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 {
//.........这里部分代码省略.........