I'm trying to use push/pull pattern with jeromq(0.3.2). At the beginnig, it works well. but after a period of time. the push side doesn't send out messages and blocked there. I don't know why. I set the sendTimeout param, and print the zmq socket error number. it is 35. Is there something I do not notice? or other suggests?
Thanks!
The push side code:
ZMQ.Context context = ZMQ.context(1);
ZMQ.Socket push4Topic = context.socket(ZMQ.PUSH);
private void init() {
push4Topic.setTCPKeepAlive(1);
push4Topic.setSendTimeOut(30000);
push4Topic.bind(bindUrl);
}
public boolean send(String msg) {
return push4Topic.send(msg);
}
private void destroy() {
if (push4Topic != null) {
push4Topic.close();
}
if (context != null) {
context.term();
}
logger.info("destroy() socket destroied");
}
====
I add one monitor thread monitoring the push side. then, I found that ZMQ_EVENT_DISCONNECTED event. what is that mean? my pull side code has problems?
Related
I want to implement Play Install Referrer API and I found document and I read that but I have have some confusion. First I have implemented all code provided by google. But I want to know which type of url I need to create so that user can click on link and go to play store and install my app and then I get the referral detail..
I use this code:
InstallReferrerClient mReferrerClient;
mReferrerClient = newBuilder(this).build();
mReferrerClient.startConnection(this);
#Override
public void onInstallReferrerSetupFinished ( int responseCode){
switch (responseCode) {
case InstallReferrerClient.InstallReferrerResponse.OK:
// Connection established
/* ReferrerDetails response = null;
try {
response = mReferrerClient.getInstallReferrer();
response.getInstallReferrer();
response.getReferrerClickTimestampSeconds();
response.getInstallBeginTimestampSeconds();
} catch (RemoteException e) {
e.printStackTrace();
}*/
break;
case InstallReferrerClient.InstallReferrerResponse.FEATURE_NOT_SUPPORTED:
// API not available on the current Play Store app
break;
case InstallReferrerClient.InstallReferrerResponse.SERVICE_UNAVAILABLE:
// Connection could not be established
break;
}
}
#Override
public void onInstallReferrerServiceDisconnected () {
}
But which type of link I create so user go to play store and after install play store referral api give me data..
Sample url - "https://play.google.com/store/apps/details?id=com.dummy.app&referrer=referralCode%3D311566%26source%3DFacebook+App"
When using the Google Play Referrer API -
InstallReferrerClient mReferrerClient;
mReferrerClient = newBuilder(this).build();
mReferrerClient.startConnection(this);
#Override
public void onInstallReferrerSetupFinished ( int responseCode){
switch (responseCode) {
case InstallReferrerClient.InstallReferrerResponse.OK:
// Connection established
/* ReferrerDetails response = null;
try {
response = mReferrerClient.getInstallReferrer();
response.getInstallReferrer();
response.getReferrerClickTimestampSeconds();
response.getInstallBeginTimestampSeconds();
} catch (RemoteException e) {
e.printStackTrace();
}*/
// End the connection once you get the data
referrerClient.endConnection();
break;
case InstallReferrerClient.InstallReferrerResponse.FEATURE_NOT_SUPPORTED:
// API not available on the current Play Store app
break;
case InstallReferrerClient.InstallReferrerResponse.SERVICE_UNAVAILABLE:
// Connection could not be established
break;
}
}
#Override
public void onInstallReferrerServiceDisconnected () {
}
getInstallReferrer()
will return String 'referralCode=311566&source=Facebook App'
play install referral library i wants to describe this in simple wording, being a developer you wants to know about these elements how much time you app bundle take to install on the user devices from play store, and referral url , referral click time and many others elements , google make it easy for you know you have to use play install referral library for this purpose.
add this dependency
implementation 'com.android.installreferrer:installreferrer:1.1'
you can follow the guidelines from here:
play installer referral guidelines
declare this variable in any java activity
InstallReferrerClient referrerClient;
in on create method use this code below :
referrerClient = InstallReferrerClient.newBuilder(this).build();
referrerClient.startConnection(new InstallReferrerStateListener() {
#Override
public void onInstallReferrerSetupFinished(int responseCode) {
switch (responseCode) {
case InstallReferrerClient.InstallReferrerResponse.OK:
// Connection established.
break;
case InstallReferrerClient.InstallReferrerResponse.FEATURE_NOT_SUPPORTED:
// API not available on the current Play Store app.
break;
case InstallReferrerClient.InstallReferrerResponse.SERVICE_UNAVAILABLE:
// Connection couldn't be established.
break;
}
}
#Override
public void onInstallReferrerServiceDisconnected() {
// Try to restart the connection on the next request to
// Google Play by calling the startConnection() method.
}
});
inside onInstallReferrerSetupFinished stabled you can get these data easily,you code will be after that like this
ReferrerDetails response = null;
try {
response = referrerClient.getInstallReferrer();
} catch (RemoteException e) {
e.printStackTrace();
}
String referrerUrl = response.getInstallReferrer();
long referrerClickTime = response.getReferrerClickTimestampSeconds();
long appInstallTime = response.getInstallBeginTimestampSeconds();
boolean instantExperienceLaunched = response.getGooglePlayInstantParam();
whole code will be like this
referrerClient = InstallReferrerClient.newBuilder(this).build();
referrerClient.startConnection(new InstallReferrerStateListener() {
#Override
public void onInstallReferrerSetupFinished(int responseCode) {
switch (responseCode) {
case InstallReferrerClient.InstallReferrerResponse.OK:
// Connection established.
ReferrerDetails response = null;
try {
response = referrerClient.getInstallReferrer();
} catch (RemoteException e) {
e.printStackTrace();
}
String referrerUrl = response.getInstallReferrer();
long referrerClickTime = response.getReferrerClickTimestampSeconds();
long appInstallTime = response.getInstallBeginTimestampSeconds();
boolean instantExperienceLaunched = response.getGooglePlayInstantParam();
break;
case InstallReferrerClient.InstallReferrerResponse.FEATURE_NOT_SUPPORTED:
// API not available on the current Play Store app.
break;
case InstallReferrerClient.InstallReferrerResponse.SERVICE_UNAVAILABLE:
// Connection couldn't be established.
break;
}
}
#Override
public void onInstallReferrerServiceDisconnected() {
// Try to restart the connection on the next request to
// Google Play by calling the startConnection() method.
}
});
When I run my code I get:
Breaking on exception: String expected
What I am trying to do is connect to my server using a websocket. However, it seems that no matter if my server is online or not the client still crashes.
My code:
import 'dart:html';
WebSocket serverConn;
int connectionAttempts;
TextAreaElement inputField = querySelector("#inputField");
String key;
void submitMessage(Event e) {
if (serverConn.readyState == WebSocket.OPEN) {
querySelector("#chatLog").text = inputField.value;
inputField.value = "";
}
}
void recreateConnection(Event e) {
connectionAttempts++;
if (connectionAttempts <= 5) {
inputField.value = "Connection failed, reconnecting. Attempt" + connectionAttempts.toString() + "out of 5";
serverConn = new WebSocket("ws://127.0.0.1:8887");
serverConn.onClose.listen(recreateConnection);
serverConn.onError.listen(recreateConnection);
} else {
inputField.value = "Connections ran out, please refresh site";
}
}
void connected(Event e) {
serverConn.sendString(key);
if (serverConn.readyState == WebSocket.OPEN) {
inputField.value = "CONNECTED!";
inputField.readOnly = false;
}
}
void main() {
serverConn = new WebSocket("ws://127.0.0.1:8887");
serverConn.onClose.listen(recreateConnection);
serverConn.onError.listen(recreateConnection);
serverConn.onOpen.listen(connected);
//querySelector("#inputField").onInput.listen(submitMessage);
querySelector("#sendInput").onClick.listen(submitMessage);
}
My Dart Editor says nothing about where the problem comes from nor does it give any warning until run-time.
You need to initialize int connectionAttempts; with a valid value;
connectionAttempts++; fails with an exception on null.
You also need an onMessage handler to receive messages.
serverConn.onMessage.listen((MessageEvent e) {
recreateConnection should register an onOpen handler as well.
After serverConn = new WebSocket the listener registered in main() will not work
If you register a listener where only one single event is expected you can use first instead of listen
serverConn.onOpen.first.then(connected);
According to #JAre s comment.
Try to use a hardcoded string
querySelector("#chatLog").text = 'someValue';
to ensure this is not the culprit.
I'm looking into ZeroMQ for its PGM support.
Running on Windows (in a VirtualBox with MacOS as host, if that could matter), using the NetMQ library.
The test I want to do is very simple: send messages from A to B as fast as possible...
First I used TCP as transport; this got easily to >150 000 messages per second, with two receivers keeping pace.
Then I wanted to test PGM; all I did was to replace the address "tcp://*:5556" with "pgm://239.0.0.1:5557" on both sides.
Now, the PGM tests give very strange results: the sender easily gets to >200 000 messages/s; the receiver though, manages to process only about 500 messages/s !?
So, I don't understand what is happening.
After slowing down the sender (sleep 10ms after each message, since otherwise it's practically impossible to investigate the flow) it appears to me that the receiver is trying to keep up, initially sees every message passing by, then chokes, misses a range of messages, then tries to keep up again...
I played with the HWM and Recovery Interval settings, but that didn't seem to make much difference (?!).
Can anyone explain what's going on?
Many thanks,
Frederik
Note: Not sure if it's matters: as far as I understand, I don't use OpenPGM - I just download the ZeroMQ setup, and enabled 'Multicasting Support' in Windows.
This is the Sender code:
class MassSender
{
private const string TOPIC_PREFIX = "Hello:";
private static int messageCounter = 0;
private static int timerCounter = 0;
public static void Main(string[] args)
{
Timer timer = new Timer(1000);
timer.Elapsed += timer_Elapsed;
SendMessages_0MQ_NetMQ(timer);
}
private static void SendMessages_0MQ_NetMQ(Timer timer)
{
using (NetMQContext context = NetMQContext.Create())
{
using (NetMQSocket publisher = context.CreateSocket(ZmqSocketType.Pub))
{
//publisher.Bind("tcp://*:5556");
publisher.Bind("pgm://239.0.0.1:5557"); // IP of interface is not specified so use default interface.
timer.Start();
while (true)
{
string message = GetMessage();
byte[] body = Encoding.UTF8.GetBytes(message);
publisher.Send(body);
}
}
}
}
private static string GetMessage()
{
return TOPIC_PREFIX + "Message " + (++messageCounter).ToString();
}
static void timer_Elapsed(object sender, ElapsedEventArgs e)
{
Console.WriteLine("=== SENT {0} MESSAGES SO FAR - TOTAL AVERAGE IS {1}/s ===", messageCounter, messageCounter / ++timerCounter);
}
}
and the Receiver:
class MassReceiver
{
private const string TOPIC_PREFIX = "Hello:";
private static int messageCounter = 0;
private static int timerCounter = 0;
private static string lastMessage = String.Empty;
static void Main(string[] args)
{
// Assume that sender and receiver are started simultaneously.
Timer timer = new Timer(1000);
timer.Elapsed += timer_Elapsed;
ReceiveMessages_0MQ_NetMQ(timer);
}
private static void ReceiveMessages_0MQ_NetMQ(Timer timer)
{
using (NetMQContext context = NetMQContext.Create())
{
using (NetMQSocket subscriber = context.CreateSocket(ZmqSocketType.Sub))
{
subscriber.Subscribe(""); // Subscribe to everything
//subscriber.Connect("tcp://localhost:5556");
subscriber.Connect("pgm://239.0.0.1:5557"); // IP of interface is not specified so use default interface.
timer.Start();
while (true)
{
messageCounter++;
byte[] body = subscriber.Receive();
string message = Encoding.UTF8.GetString(body);
lastMessage = message; // Only show message when timer elapses, otherwise throughput drops dramatically.
}
}
}
}
static void timer_Elapsed(object sender, ElapsedEventArgs e)
{
Console.WriteLine("=== RECEIVED {0} MESSAGES SO FAR - TOTAL AVERAGE IS {1}/s === (Last: {2})", messageCounter, messageCounter / ++timerCounter, lastMessage);
}
}
What is the size of each message?
You are not using OpenPGM, you are using what is called ms-pgm (Microsoft implementation of PGM).
Anyway you might have to change the MulticastRate of the socket (it defaults to 100kbit/s).
Also what kind of network are you using?
I run into the same issue, the sender can send thousands of messages per second. But my receiver can only receive two hundred messages per second.
I think it could be sending or receiving rate is limited. I check
ZMQ_RATE: Set multicast data rate in http://api.zeromq.org/3-0:zmq-setsockopt
The default rate is just 100kb/s.
When I increase it to 1Gb/s, everything is OK now.
const int rate = 1000000; // 1Gb TX- and RX- rate
m_socket.setsockopt(ZMQ_RATE, &rate, sizeof(rate));
I am using PushStreamContent to keep a persistent connection to each client. Pushing short heartbeat messages to each client stream every 20 seconds works great with 100 clients, but at about 200 clients, the client first starts receiving it a few seconds delayed, then it doesn't show up at all.
My controller code is
// Based loosely on https://aspnetwebstack.codeplex.com/discussions/359056
// and http://blogs.msdn.com/b/henrikn/archive/2012/04/23/using-cookies-with-asp-net-web-api.aspx
public class LiveController : ApiController
{
public HttpResponseMessage Get(HttpRequestMessage request)
{
if (_timer == null)
{
// 20 second timer
_timer = new Timer(TimerCallback, this, 20000, 20000);
}
// Get '?clientid=xxx'
HttpResponseMessage response = request.CreateResponse();
var kvp = request.GetQueryNameValuePairs().Where(q => q.Key.ToLower() == "clientid").FirstOrDefault();
string clientId = kvp.Value;
HttpContext.Current.Response.ClientDisconnectedToken.Register(
delegate(object obj)
{
// Client has cleanly disconnected
var disconnectedClientId = (string)obj;
CloseStreamFor(disconnectedClientId);
}
, clientId);
response.Content = new PushStreamContent(
delegate(Stream stream, HttpContent content, TransportContext context)
{
SaveStreamFor(clientId, stream);
}
, "text/event-stream");
return response;
}
private static void CloseStreamFor(string clientId)
{
Stream oldStream;
_streams.TryRemove(clientId, out oldStream);
if (oldStream != null)
oldStream.Close();
}
private static void SaveStreamFor(string clientId, Stream stream)
{
_streams.TryAdd(clientId, stream);
}
private static void TimerCallback(object obj)
{
DateTime start = DateTime.Now;
// Disable timer
_timer.Change(Timeout.Infinite, Timeout.Infinite);
// Every 20 seconds, send a heartbeat to each client
var recipients = _streams.ToArray();
foreach (var kvp in recipients)
{
string clientId = kvp.Key;
var stream = kvp.Value;
try
{
// ***
// Adding this Trace statement and running in debugger caused
// heartbeats to be reliably flushed!
// ***
Trace.WriteLine(string.Format("** {0}: Timercallback: {1}", DateTime.Now.ToString("G"), clientId));
WriteHeartBeat(stream);
}
catch (Exception ex)
{
CloseStreamFor(clientId);
}
}
// Trace... (this trace statement had no effect)
_timer.Change(20000, 20000); // re-enable timer
}
private static void WriteHeartBeat(Stream stream)
{
WriteStream(stream, "event:heartbeat\ndata:-\n\n");
}
private static void WriteStream(Stream stream, string data)
{
byte[] arr = Encoding.ASCII.GetBytes(data);
stream.Write(arr, 0, arr.Length);
stream.Flush();
}
private static readonly ConcurrentDictionary<string, Stream> _streams = new ConcurrentDictionary<string, Stream>();
private static Timer _timer;
}
Could there be some ASP.NET or IIS setting that affects this? I am running on Windows Server 2008 R2.
UPDATE:
Heartbeats are reliably sent if 1) the Trace.WriteLine statement is added, 2) Visual Studio 2013 debugger is attached and debugging and capturing the Trace.WriteLines).
Both of these are necessary; if the Trace.WriteLine is removed, running under the debugger has no effect. And if the Trace.WriteLine is there but the program is not running under the debugger (instead SysInternals' DbgView is showing the trace messages), the heartbeats are unreliable.
UPDATE 2:
Two support incidents with Microsoft later, here are the conclusions:
1) The delays with 200 clients were resolved by using a business class Internet connection instead of a Home connection
2) whether the debugger is attached or not really doesn't make any difference;
3) The following two additions to web.config are required to ensure heartbeats are sent timely, and failed heartbeats due to client disconnecting "uncleanly" (e.g. by unplugging computer rather than normal closing of program which cleanly issues TCP RST) trigger a timely ClientDisconnected callback as well:
<httpRuntime executionTimeout="5" />
<serverRuntime appConcurrentRequestLimit="50000" uploadReadAheadSize="1" frequentHitThreshold="2147483647" />
I have one problem with publish/handle messages between 2 screens.
My scenario is:
Messenger screen, is it master screen, publish on chat screens, they are slave screens.
Messenger view model handle with messages from server.
Chat screen can publishes messages on messenger screen. And messanger view model send this message on server.
Messenger class look like this:
[Export("MessengerScreen", typeof(IMessengerViewModel))]
public class MessengerViewModel : Screen, IMessengerViewModel, IInitializable<Account>, IHandle<Rp>
{
// ...
[ImportingConstructor]
public MessengerViewModel(IPokecService service, IEventAggregator eventAgg)
{
_eventAgg = eventAgg;
_eventAgg.Subscribe(this);
}
//publish on slave screen
public void Publish(Rp rp)
{
_eventAgg.Publish(rp);
}
//handle msg from slave screen
public void Handle(Rp msg)
{
//send to server
}
}
Slave screen class look like this:
[Export("ChatScreen", typeof(IChatViewModel))]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class ChatViewModel : Screen, IInitializable<DetailData>, IHandle<Rp>
{
[ImportingConstructor]
public ChatViewModel(IEventAggregator eventAgg)
{
_eventAgg = eventAgg;
_eventAgg.Subscribe(this);
}
//publish only on messenger screen
public void Publish(Rp rp)
{
_eventAgg.Publish(rp);
}
//show message from published from messenger
public void Handle(Rp rp)
{
AddBlockToConversation(rp);
}
//if enter is pressed publish on messanger screen
public void SendRp(KeyEventArgs e)
{
if (e.Key == Key.Enter && !string.IsNullOrEmpty(RpText))
{
_yourRp.Time = String.Format("{0:yyyy-MM-dd HH:mm:ss}", DateTime.Now);
_yourRp.RpText = RpText;
AddBlockToConversation(_yourRp);
//publish on messanger screen
Publish(_yourRp);
}
}
}
My problems are:
First problem is:
I call method SendRp from class
ChatViewModel.
It calls method void Publish() in ChatViewModel,
then is call method void Handle() from class MessengerViewModel
and then call also method void
Handle() from ChatViewModel class.
I don’t want call method Handle() in ChatViewModel class. Why if I send message from ChatViewModel to MessengerViewModel is also called method Handle in ChatViewModel class?
My second problem is:
I would like publish from MessengerViewModel message on only certain slave screen.
MessgerVieModel have in queue messages: {msg1, msg2, msg3, ..., msgN}
I would like publish:
msg1 on slave screen #1.
msg2 on slave screen #2
...
msg3 on slave screen #3
MY SOLUTION:
I solved my problem with modification class EventAggregator.
Something like this:
Every my view model imlements this interface:
public interface IViewModelIdentity
{
string ScreenIdentity { get; set; }
}
And in Publish method in even aggregator class I have this:
public void Publish(Rp rp)
{
WeakReference[] toNotify;
lock (_subscribers)
toNotify = _subscribers.ToArray();
Execute.OnUIThread(() =>
{
Log.Info("Publishing {0}.", rp);
var dead = new List<WeakReference>();
foreach (var reference in toNotify)
{
var target = reference.Target as IHandle<Rp>;
//GET ID OF SCREEN
var screenId = reference.Target as IViewModelIdentity;
//!
if (target != null && screenId != null)
{
if (screenId.ScreenIdentity=="screen on which we want to send a message")
{
//PUBLISH ON SCREEN
target.Handle(rp);
}
}
else if (!reference.IsAlive)
dead.Add(reference);
}
if (dead.Count > 0)
{
lock (_subscribers)
dead.Apply(x => _subscribers.Remove(x));
}
});
}