func runSender(qnum int) {
ltag := tag + "-runsender"
ll.Printf("%stag:%s connsess:%s start qnum:%d\n",
exampid, ltag, sngecomm.Lcs,
qnum)
// Standard example connect sequence
n, conn, e := sngecomm.CommonConnect(exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s error:%s\n",
exampid, ltag, sngecomm.Lcs,
e.Error()) // Handle this ......
}
//
sendMessages(conn, qnum, n)
ll.Printf("%stag:%s connsess:%s sends_complete qnum:%d\n",
exampid, ltag, conn.Session(),
qnum)
// Standard example disconnect sequence
e = sngecomm.CommonDisconnect(n, conn, exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s error:%s\n",
exampid, ltag, conn.Session(),
e.Error()) // Handle this ......
}
sngecomm.ShowStats(exampid, "send_"+fmt.Sprintf("%d", qnum), conn)
wgs.Done()
}
func runReceiver(qnum int) {
ltag := tag + "-runreceiver"
ll.Printf("%stag:%s connsess:%s start qnum:%d\n",
exampid, ltag, sngecomm.Lcs,
qnum)
// Standard example connect sequence
n, conn, e := sngecomm.CommonConnect(exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s error:%s\n",
exampid, ltag, sngecomm.Lcs,
e.Error()) // Handle this ......
}
//
conn.SetSubChanCap(senv.SubChanCap()) // Experiment with this value, YMMV
// Receives
receiveMessages(conn, qnum, n)
ll.Printf("%stag:%s connsess:%s receives_complete qnum:%d\n",
exampid, ltag, conn.Session(),
qnum)
// Standard example disconnect sequence
e = sngecomm.CommonDisconnect(n, conn, exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s error:%s\n",
exampid, ltag, conn.Session(),
e.Error()) // Handle this ......
}
sngecomm.ShowStats(exampid, "recv_"+fmt.Sprintf("%d", qnum), conn)
wgr.Done()
}
/*
startSender initializes the single send connection, and starts one sender go
for each destination.
*/
func startSender() {
ltag := tag + "-startsender"
n, conn := openSconn()
ll.Printf("%stag:%s connsess:%s start\n",
exampid, ltag, conn.Session())
for i := 1; i <= sngecomm.Nqs(); i++ {
wgs.Add(1)
go runSender(conn, fmt.Sprintf("%d", i))
}
wgs.Wait()
ll.Printf("%stag:%s connsess:%s end\n",
exampid, ltag, conn.Session())
sngecomm.ShowStats(exampid, ltag, conn)
closeSconn(n, conn)
//
wga.Done()
}
func startReceivers(qn int) {
ltag := tag + "-startreceivers"
ll.Printf("%stag:%s connsess:%s starts qn:%d\n",
exampid, ltag, sngecomm.Lcs,
qn)
// Standard example connect sequence
n, conn, e := sngecomm.CommonConnect(exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s on_connect error:%v",
exampid, ltag, sngecomm.Lcs,
e.Error()) // Handle this ......
}
nmsgs := senv.Nmsgs() // get message count
ll.Printf("%stag:%s connsess:%s message_count nmsgs:%d qn:%d\n",
exampid, ltag, conn.Session(),
nmsgs, qn)
for i := 1; i <= qn; i++ { // all queues
wgr.Add(1)
go receiver(conn, i, nmsgs)
}
ll.Printf("%stag:%s connsess:%s starts_done\n",
exampid, ltag, conn.Session())
wgr.Wait()
// Standard example disconnect sequence
e = sngecomm.CommonDisconnect(n, conn, exampid, ltag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s on_disconnect error:%v",
exampid, ltag, conn.Session(),
e.Error()) // Handle this ......
}
sngecomm.ShowStats(exampid, ltag, conn)
wga.Done()
}
/*
startReceivers creates connections per environment variables, and starts each
connection.
*/
func startReceivers() {
ltag := tag + "-startreceivers"
// This was a performance experiment. With number of connections.
// My recollection is that it did not work out.
// However ..... I will leave this code in place for now.
// Figure out number of receiver connections wanted
nrc := sngecomm.Nqs() // 1 receiver per each destination
nqs := nrc // Number of queues (destinations) starts the same
if s := os.Getenv("STOMP_RECVCONNS"); s != "" {
i, e := strconv.ParseInt(s, 10, 32)
if nil != e {
ll.Fatalf("%stag:%s connsess:%s RECVCONNS_conversion_error error:%v\n",
exampid, ltag, sngecomm.Lcs,
e.Error())
} else {
nrc = int(i)
}
}
// Limit max receiver connection count to number of destinations
if nrc > nqs {
nrc = nqs
}
// Next calc. destinations per receiver
dpr := nqs / nrc // Calculation first guess.
if nqs%nrc != 0 {
dpr += 1 // Bump destinations per receiver by 1.
}
// Destinations per receiver must be at least 1
if dpr == 0 {
dpr = 1
}
ll.Printf("%stag:%s connsess:%s start nrc:%d dpr:%d\n",
exampid, ltag, sngecomm.Lcs,
nrc, dpr)
// So the idea seems to be allow more than one destination per receiver
ncm := make([]net.Conn, 0)
csm := make([]*stompngo.Connection, 0)
for c := 1; c <= nrc; c++ { // :-)
n, conn := openSconn()
ncm = append(ncm, n)
csm = append(csm, conn)
wgr.Add(1)
ll.Printf("%stag:%s connsess:%s connstart conn_number:%d nrc:%d dpr:%d\n",
exampid, ltag, conn.Session(),
c, nrc, dpr)
go receiverConnection(conn, c, dpr)
}
wgr.Wait()
ll.Printf("%stag:%s connsess:%s wait_done nrc:%d dpr:%d\n",
exampid, ltag, sngecomm.Lcs,
nrc, dpr)
//
for c := 1; c <= nrc; c++ {
ll.Printf("%stag:%s connsess:%s connend conn_number:%d nrc:%d dpr:%d\n",
exampid, ltag, csm[c-1].Session(),
c, nrc, dpr)
sngecomm.ShowStats(exampid, ltag, csm[c-1])
closeSconn(ncm[c-1], csm[c-1])
}
//
wga.Done()
}
// A forever reader.
func main() {
st := time.Now()
sngecomm.ShowRunParms(exampid)
// Standard example connect sequence
var e error
n, conn, e = sngecomm.CommonConnect(exampid, tag, ll)
if e != nil {
if conn != nil {
ll.Printf("%stag:%s connsess:%s Connect Response headers:%v body%s\n",
exampid, tag, conn.Session(), conn.ConnectResponse.Headers,
string(conn.ConnectResponse.Body))
}
ll.Fatalf("%stag:%s connsess:%s main_on_connect error:%v",
exampid, tag, sngecomm.Lcs,
e.Error()) // Handle this ......
}
//**
qn := 1
ltag := tag + "-receiver"
id := stompngo.Uuid() // A unique subscription ID
d := sngecomm.Dest()
ll.Printf("%stag:%s connsess:%s queue_info id:%v d:%v qnum:%v\n",
exampid, ltag, conn.Session(),
id, d, qn)
// Subscribe
sc := sngecomm.HandleSubscribe(conn, d, id, sngecomm.AckMode())
ll.Printf("%stag:%s connsess:%s subscribe_complete id:%v d:%v qnum:%v\n",
exampid, ltag, conn.Session(),
id, d, qn)
//
var md stompngo.MessageData
// Receive loop
mc := 1
for {
ll.Println("========================== ", "Expecting Message:", mc,
"==========================")
select {
case md = <-sc:
case md = <-conn.MessageData:
// A RECEIPT or ERROR frame is unexpected here
ll.Fatalf("%stag:%s connsess:%s bad_frame qnum:%v headers:%v body:%s",
exampid, tag, conn.Session(),
qn, md.Message.Headers, md.Message.Body) // Handle this ......
}
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s recv_error qnum:%v error:%v",
exampid, tag, conn.Session(),
qn, md.Error) // Handle this ......
}
ll.Printf("%stag:%s connsess:%s next_frame mc:%v command:%v headers:%v body:%v\n",
exampid, tag, conn.Session(),
mc, md.Message.Command, md.Message.Headers, string(md.Message.Body)) // Handle this ......
mc++
}
//**
// Standard example disconnect sequence
e = sngecomm.CommonDisconnect(n, conn, exampid, tag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s main_on_disconnect error:%v",
exampid, tag, conn.Session(),
e.Error()) // Handle this ......
}
sngecomm.ShowStats(exampid, tag, conn)
ll.Printf("%stag:%s connsess:%s main_elapsed:%v\n",
exampid, tag, conn.Session(),
time.Now().Sub(st))
}
// Show a number of writers and readers operating concurrently from unique
// destinations.
func main() {
st := time.Now()
sngecomm.ShowRunParms(exampid)
ll.Printf("%stag:%s connsess:%s main_starts\n",
exampid, tag, sngecomm.Lcs)
ll.Printf("%stag:%s connsess:%s main_profiling pprof:%v\n",
exampid, tag, sngecomm.Lcs,
sngecomm.Pprof())
ll.Printf("%stag:%s connsess:%s main_current_GOMAXPROCS gmp:%v\n",
exampid, tag, sngecomm.Lcs,
runtime.GOMAXPROCS(-1))
if sngecomm.SetMAXPROCS() {
nc := runtime.NumCPU()
ll.Printf("%stag:%s connsess:%s main_current_num_cpus cncpu:%v\n",
exampid, tag, sngecomm.Lcs,
nc)
gmp := runtime.GOMAXPROCS(nc)
ll.Printf("%stag:%s connsess:%s main_previous_num_cpus pncpu:%v\n",
exampid, tag, sngecomm.Lcs,
gmp)
ll.Printf("%stag:%s connsess:%s main_current_GOMAXPROCS gmp:%v\n",
exampid, tag, sngecomm.Lcs,
runtime.GOMAXPROCS(-1))
}
// Wait flags
sw = sngecomm.SendWait()
rw = sngecomm.RecvWait()
sf = sngecomm.SendFactor()
rf = sngecomm.RecvFactor()
ll.Printf("%stag:%s connsess:%s main_wait_sleep_factors sw:%v rw:%v sf:%v rf:%v\n",
exampid, tag, sngecomm.Lcs,
sw, rw, sf, rf)
// Number of queues
nqs := sngecomm.Nqs()
// Standard example connect sequence
var e error
n, conn, e = sngecomm.CommonConnect(exampid, tag, ll)
if e != nil {
if conn != nil {
ll.Printf("%stag:%s connsess:%s Connect Response headers:%v body%s\n",
exampid, tag, conn.Session(), conn.ConnectResponse.Headers,
string(conn.ConnectResponse.Body))
}
ll.Fatalf("%stag:%s connsess:%s main_on_connect error:%v",
exampid, tag, sngecomm.Lcs,
e.Error()) // Handle this ......
}
// Many receivers running under the same connection can cause
// (wire read) performance issues. This is *very* dependent on the broker
// being used, specifically the broker's algorithm for putting messages on
// the wire.
// To alleviate those issues, this strategy insures that messages are
// received from the wire as soon as possible. Those messages are then
// buffered internally for (possibly later) application processing. In
// this example, buffering occurs in the stompngo package.
conn.SetSubChanCap(senv.SubChanCap()) // Experiment with this value, YMMV
// Run everything
wga.Add(2)
go startReceivers(nqs)
go startSenders(nqs)
wga.Wait()
// Standard example disconnect sequence
e = sngecomm.CommonDisconnect(n, conn, exampid, tag, ll)
if e != nil {
ll.Fatalf("%stag:%s connsess:%s main_on_disconnect error:%v",
exampid, tag, conn.Session(),
e.Error()) // Handle this ......
}
sngecomm.ShowStats(exampid, tag, conn)
ll.Printf("%stag:%s connsess:%s main_elapsed:%v\n",
exampid, tag, conn.Session(),
time.Now().Sub(st))
}