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Flooding of message at side client from server channel and wrong message with CometD frame work

I am developing a client-server application, where I wanted to have a persistent connection between client-server, and I chose the CometD framework for the same.
I successfully created the CometD application.
Client -
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.cometd.bayeux.Channel;
import org.cometd.bayeux.Message;
import org.cometd.bayeux.client.ClientSessionChannel;
import org.cometd.client.BayeuxClient;
import org.cometd.client.transport.LongPollingTransport;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import com.synacor.idm.auth.LdapAuthenticator;
import com.synacor.idm.resources.LdapResource;
public class CometDClient {
private volatile BayeuxClient client;
private final AuthListner authListner = new AuthListner();
private LdapResource ldapResource;
public static void main(String[] args) throws Exception {
org.eclipse.jetty.util.log.Log.getProperties().setProperty("org.eclipse.jetty.LEVEL", "ERROR");
org.eclipse.jetty.util.log.Log.getProperties().setProperty("org.eclipse.jetty.util.log.announce", "false");
org.eclipse.jetty.util.log.Log.getRootLogger().setDebugEnabled(false);
CometDClient client = new CometDClient();
client.run();
}
public void run() {
String url = "http://localhost:1010/cometd";
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
client = new BayeuxClient(url, new LongPollingTransport(null, httpClient));
client.getChannel(Channel.META_HANDSHAKE).addListener(new InitializerListener());
client.getChannel(Channel.META_CONNECT).addListener(new ConnectionListener());
client.getChannel("/ldapAuth").addListener(new AuthListner());
client.handshake();
boolean success = client.waitFor(1000, BayeuxClient.State.CONNECTED);
if (!success) {
System.err.printf("Could not handshake with server at %s%n", url);
return;
}
}
private void initialize() {
client.batch(() -> {
ClientSessionChannel authChannel = client.getChannel("/ldapAuth");
authChannel.subscribe(authListner);
});
}
private class InitializerListener implements ClientSessionChannel.MessageListener {
#Override
public void onMessage(ClientSessionChannel channel, Message message) {
if (message.isSuccessful()) {
initialize();
}
}
}
private class ConnectionListener implements ClientSessionChannel.MessageListener {
private boolean wasConnected;
private boolean connected;
#Override
public void onMessage(ClientSessionChannel channel, Message message) {
if (client.isDisconnected()) {
connected = false;
connectionClosed();
return;
}
wasConnected = connected;
connected = message.isSuccessful();
if (!wasConnected && connected) {
connectionEstablished();
} else if (wasConnected && !connected) {
connectionBroken();
}
}
}
private void connectionEstablished() {
System.err.printf("system: Connection to Server Opened%n");
}
private void connectionClosed() {
System.err.printf("system: Connection to Server Closed%n");
}
private void connectionBroken() {
System.err.printf("system: Connection to Server Broken%n");
}
private class AuthListner implements ClientSessionChannel.MessageListener{
#Override
public void onMessage(ClientSessionChannel channel, Message message) {
Object data2 = message.getData();
System.err.println("Authentication String " + data2 );
if(data2 != null && data2.toString().indexOf("=")>0) {
String[] split = data2.toString().split(",");
String userString = split[0];
String passString = split[1];
String[] splitUser = userString.split("=");
String[] splitPass = passString.split("=");
LdapAuthenticator authenticator = new LdapAuthenticator(ldapResource);
if(authenticator.authenticateToLdap(splitUser[1], splitPass[1])) {
// client.getChannel("/ldapAuth").publish("200:success from client "+user);
// channel.publish("200:Success "+user);
Map<String, Object> data = new HashMap<>();
// Fill in the structure, for example:
data.put(splitUser[1], "Authenticated");
channel.publish(data, publishReply -> {
if (publishReply.isSuccessful()) {
System.out.print("message sent successfully on server");
}
});
}
}
}
}
}
Server - Service Class
import java.util.List;
import java.util.concurrent.BlockingQueue;
import org.cometd.bayeux.MarkedReference;
import org.cometd.bayeux.Promise;
import org.cometd.bayeux.server.BayeuxServer;
import org.cometd.bayeux.server.ConfigurableServerChannel;
import org.cometd.bayeux.server.ServerChannel;
import org.cometd.bayeux.server.ServerMessage;
import org.cometd.bayeux.server.ServerSession;
import org.cometd.server.AbstractService;
import org.cometd.server.ServerMessageImpl;
import com.synacor.idm.resources.AuthenticationResource;
import com.synacor.idm.resources.AuthenticationResource.AuthC;
public class AuthenticationService extends AbstractService implements AuthenticationResource.Listener {
String authParam;
BayeuxServer bayeux;
BlockingQueue<String> sharedResponseQueue;
public AuthenticationService(BayeuxServer bayeux) {
super(bayeux, "ldapagentauth");
addService("/ldapAuth", "ldapAuthentication");
this.bayeux = bayeux;
}
public void ldapAuthentication(ServerSession session, ServerMessage message) {
System.err.println("********* inside auth service ***********");
Object data = message.getData();
System.err.println("****** got data back from client " +data.toString());
sharedResponseQueue.add(data.toString());
}
#Override
public void onUpdates(List<AuthC> updates) {
System.err.println("********* inside auth service listner ***********");
MarkedReference<ServerChannel> createChannelIfAbsent = bayeux.createChannelIfAbsent("/ldapAuth", new ConfigurableServerChannel.Initializer() {
public void configureChannel(ConfigurableServerChannel channel)
{
channel.setPersistent(true);
channel.setLazy(true);
}
});
ServerChannel reference = createChannelIfAbsent.getReference();
for (AuthC authC : updates) {
authParam = authC.getAuthStr();
this.sharedResponseQueue= authC.getsharedResponseQueue();
ServerChannel channel = bayeux.getChannel("/ldapAuth");
ServerMessageImpl serverMessageImpl = new ServerMessageImpl();
serverMessageImpl.setData(authParam);
reference.setBroadcastToPublisher(false);
reference.publish(getServerSession(), authParam, Promise.noop());
}
}
}
Event trigger class-
public class AuthenticationResource implements Runnable{
private final JerseyClientBuilder clientBuilder;
private final BlockingQueue<String> sharedQueue;
private final BlockingQueue<String> sharedResponseQueue;
private boolean isAuthCall = false;
private String userAuth;
private final List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
Thread runner;
public AuthenticationResource(JerseyClientBuilder clientBuilder,BlockingQueue<String> sharedQueue,BlockingQueue<String> sharedResponseQueue) {
super();
this.clientBuilder = clientBuilder;
this.sharedQueue = sharedQueue;
this.sharedResponseQueue= sharedResponseQueue;
this.runner = new Thread(this);
this.runner.start();
}
public List<Listener> getListeners()
{
return listeners;
}
#Override
public void run() {
List<AuthC> updates = new ArrayList<AuthC>();
// boolean is = true;
while(true){
if(sharedQueue.size()<=0) {
continue;
}
try {
userAuth = sharedQueue.take();
// Notify the listeners
for (Listener listener : listeners)
{
updates.add(new AuthC(userAuth,sharedResponseQueue));
listener.onUpdates(updates);
}
updates.add(new AuthC(userAuth,sharedResponseQueue));
System.out.println("****** Auth consume ******** " + userAuth);
if(userAuth != null) {
isAuthCall = true;
}
} catch (Exception err) {
err.printStackTrace();
break;
}
// if (sharedQueue.size()>0) {
// is = false;
// }
}
}
public static class AuthC
{
private final String authStr;
private final BlockingQueue<String> sharedResponseQueue;
public AuthC(String authStr,BlockingQueue<String> sharedResponseQueue)
{
this.authStr = authStr;
this.sharedResponseQueue=sharedResponseQueue;
}
public String getAuthStr()
{
return authStr;
}
public BlockingQueue<String> getsharedResponseQueue()
{
return sharedResponseQueue;
}
}
public interface Listener extends EventListener
{
void onUpdates(List<AuthC> updates);
}
}
I have successfully established a connection between client and server.
Problems -
1- When I am sending a message from the server to the Client, the same message is sent out multiple times. I only expecting one request-response mechanism.
In my case- server is sending user credentila I am expecting result, whether the user is authenticated or not.
you can see in image how it is flooding with same string at client side -
2- There was other problem looping up of message between client and server, that I can be able to resolve by adding, but still some time looping of message is happening.
serverChannel.setBroadcastToPublisher(false);
3- If I change the auth string on sever, at client side it appears to be old one.
For example -
1 request from server - auth string -> user=foo,pass=bar -> at
client side - user=foo,pass=bar
2 request from server - auth string user=myuser,pass=mypass ->
at client side - user=foo,pass=bar
this are the three problems, please guide me and help me to resolve this.

CometD offer a request/response style of messaging using remote calls, both on the client and on the server (you want to use annotated services on the server).
Channel /ldapAuth has 2 subscribers: the remote client (which subscribes with authChannel.subscribe(...)), and the server-side AuthenticationService (which subscribes with addService("/ldapAuth", "ldapAuthentication")).
Therefore, every time you publish to that channel from AuthenticationService.onUpdates(...), you publish to the remote client, and then back to AuthenticationService, and that is why calling setBroadcastToPublisher(false) helps.
For authentication messages, it's probably best that you stick with remote calls, because they have a natural request/response semantic, rather than a broadcasting semantic.
Please read about how applications should interact with CometD.
About other looping, there are no loops triggered by CometD.
You have loops in your application (in AuthenticationService.onUpdates(...)) and you take from a queue that may have the same information multiple times (in AuthenticationResource.run() -- which by the way it's a spin loop that will likely spin a CPU core to 100% utilization -- you should fix that).
The fact that you see stale data it's likely not a CometD issue, since CometD does not store messages anywhere so it cannot make up user-specific data.
I recommend that you clean up your code using remote calls and annotated services.
Also, clean up your own code from spin loops.
If you still have the problem after the suggestions above, look harder for application mistakes, it's unlikely that this is a CometD issue.

Java - Override a WebRequest on Web Service Call

Quick background, our company connects to an ERP system (Sage) via web services for some functions. We have both c# (.net) and java code that performs calls to the Web Service (WS). Recently Sage introduced Basic Authentication into their WS.
Please note: This is a JAVA question, but I'll show an example in C# first to explain.
In the c# program, I first would create an object that is for accessing the WS:
var sageService = new CAdxWebServiceXmlCCServiceBasicAuth();
I then set up credential information:
var sageServiceCallContext = SageFactory.Instance.GetCallContext();
sageService.Credentials = new NetworkCredential(SageUser, SagePwd);
sageService.PreAuthenticate = true;
then finally the call to the specific web service method:
sageCustomerSvcResponse = sageService.run(sageServiceCallContext, "YTDPROF", sageCustomerRequestInXml);
When I set up the service object I use a custom class that looks like this:
public class CAdxWebServiceXmlCCServiceBasicAuth : CAdxWebServiceXmlCCService
{
protected override WebRequest GetWebRequest(Uri uri)
{
HttpWebRequest webRequest = (HttpWebRequest)base.GetWebRequest(uri);
NetworkCredential credentials = Credentials as NetworkCredential;
if (credentials != null)
{
string authInfo = "";
if (credentials.Domain != null && credentials.Domain.Length > 0)
{
authInfo = string.Format(#"{0}\{1}:{2}", credentials.Domain, credentials.UserName, credentials.Password);
}
else
{
authInfo = string.Format(#"{0}:{1}", credentials.UserName, credentials.Password);
};
authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
webRequest.Headers["Authorization"] = "Basic " + authInfo;
}
return webRequest;
}
}
What happens is that now, when I perform any call to the web service methods, the GetWebRequest from the class is invoked every time. This is how we implemented basis authentication in c#.
How do I do this in Java?
In the java code currently, I create the service object (that which accesses the web services) this way:
WebServiceInvoker service = new WebServiceInvoker(SageWSURL,"");
and the WebServiceInvoker looks like this (truncated for brevity):
public WebServiceInvoker(String url, String dummy) throws ServiceException, IOException {
serviceLocator = new CAdxWebServiceXmlCCServiceLocator();
service = serviceLocator.getCAdxWebServiceXmlCC(url);
cc = new CAdxCallContext();
cc.setCodeLang("ENG");
cc.setCodeUser("USER");
cc.setPassword("PAWWORD");
cc.setPoolAlias("POOL");
cc.setRequestConfig("adxwss.trace.on=on&adxwss.trace.size=16384&adonix.trace.on=on&adonix.trace.level=3&adonix.trace.size=8");
log = new PrintWriter(new BufferedWriter(new FileWriter("C:/Kalio/service/orders/log.txt")));
}
the webservice locator looks like this:
public class CAdxWebServiceXmlCCServiceLocator extends org.apache.axis.client.Service implements com.adonix.www.WSS.CAdxWebServiceXmlCCService {
public CAdxWebServiceXmlCCServiceLocator() {
}
public com.adonix.www.WSS.CAdxWebServiceXmlCC getCAdxWebServiceXmlCC() throws javax.xml.rpc.ServiceException {
java.net.URL endpoint;
System.out.println("using local Sage Web Servivce URL:" + CAdxWebServiceXmlCC_address);
try {
endpoint = new java.net.URL(CAdxWebServiceXmlCC_address);
}
catch (java.net.MalformedURLException e) {
throw new javax.xml.rpc.ServiceException(e);
}
return getCAdxWebServiceXmlCC(endpoint);
}
public com.adonix.www.WSS.CAdxWebServiceXmlCC getCAdxWebServiceXmlCC(java.net.URL portAddress) throws javax.xml.rpc.ServiceException {
try {
com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub _stub = new com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub(portAddress, this);
_stub.setPortName(getCAdxWebServiceXmlCCWSDDServiceName());
return _stub;
}
catch (org.apache.axis.AxisFault e) {
return null;
}
}
and the specific method within that class is this:
public String getCustomer(String constructedXML) throws RemoteException {
**CAdxResultXml result = service.run(cc, "XTDPROF", constructedXML);**
CAdxMessage[] messages = result.getMessages();
for (int i = 0; i<messages.length; i++) {
CAdxMessage message = messages[i];
log.println("X3 get customer message: " + message.getMessage());
log.println("X3 get customer message type: " + message.getType());
}
return result.getResultXml();
}
So my questions is, how to I emulate that override that I see in the .net program in Java? It seems like it would be somewhere in either the service locator or invoker, but the program does not use standard http classes, but this adxwss stuff. I tried a straight c# to java conversion and that way didn't help. I have seen examples where basicAuth is implemented, but not against web service calls.
The c# is pretty clear cut, because once I create the service object using the basicAuth override, every web service calls goes through the orderride. How does that happen in Java?
I'll be happy to provide more info if needed and I'll continue to look/experiment, but at the moment I'm treading water.
Adding:
In tracing through the java code I found the specific web service call (run) where an apache "call" object is created. Is this where basicauth can be added?
public com.adonix.www.WSS.CAdxResultXml run(com.adonix.www.WSS.CAdxCallContext callContext, java.lang.String publicName, java.lang.String inputXml) throws java.rmi.RemoteException {
if (super.cachedEndpoint == null) {
throw new org.apache.axis.NoEndPointException();
}
org.apache.axis.client.Call _call = createCall();
_call.setOperation(_operations[0]);
_call.setUseSOAPAction(true);
_call.setSOAPActionURI("");
_call.setSOAPVersion(org.apache.axis.soap.SOAPConstants.SOAP11_CONSTANTS);
_call.setOperationName(new javax.xml.namespace.QName("http://www.adonix.com/WSS", "run"));
setRequestHeaders(_call);
setAttachments(_call);
try { java.lang.Object _resp = _call.invoke(new java.lang.Object[] {callContext, publicName, inputXml});
if (_resp instanceof java.rmi.RemoteException) {
throw (java.rmi.RemoteException)_resp;
}
else {
extractAttachments(_call);
try {
return (com.adonix.www.WSS.CAdxResultXml) _resp;
} catch (java.lang.Exception _exception) {
return (com.adonix.www.WSS.CAdxResultXml) org.apache.axis.utils.JavaUtils.convert(_resp, com.adonix.www.WSS.CAdxResultXml.class);
}
}
} catch (org.apache.axis.AxisFault axisFaultException) {
throw axisFaultException;
}
}

The solution I came up with is not elegant, but then I'm not a guru in Java, just know enough to be given these tasks.
Our company uses Sage as our ERP system and Sage has a WSDL to define the basic web services it provides.
Sage Web Servicew WSDL
In their latest version of Sage they went with basic authentication, but did not build it into the new WSDL. Since I could not seem to extend the class (CAdxWebServiceXmlCCService), I just copied/pasted a new class called CAdxWebServiceXmlCCServiceBasicAuth. The full code is shown below if anyone ever has need to deal with something like this in a web service.
The key point where BaiscAuth set set up is in the getCAdxWebServiceXmlCC method. I added setPassword and setUserName to the stub that is returned. What this accomplishes is that every time I perform a webservice method call, that stub is now part of the header.
package com.adonix.www.WSS;
import java.net.URL;
import java.util.Base64;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import javax.xml.rpc.ServiceException;
public class CAdxWebServiceXmlCCServiceBasicAuth extends org.apache.axis.client.Service implements com.adonix.www.WSS.CAdxWebServiceXmlCCService {
public CAdxWebServiceXmlCCServiceBasicAuth() {
}
public CAdxWebServiceXmlCCServiceBasicAuth(org.apache.axis.EngineConfiguration config) {
super(config);
}
public CAdxWebServiceXmlCCServiceBasicAuth(java.lang.String wsdlLoc, javax.xml.namespace.QName sName) throws javax.xml.rpc.ServiceException {
super(wsdlLoc, sName);
}
// Use to get a proxy class for CAdxWebServiceXmlCC
private java.lang.String CAdxWebServiceXmlCC_address = "http://10.28.0.7:8124/soap-generic/syracuse/collaboration/syracuse/CAdxWebServiceXmlCC";
public java.lang.String getCAdxWebServiceXmlCCAddress() {
return CAdxWebServiceXmlCC_address;
}
// The WSDD service name defaults to the port name.
private java.lang.String CAdxWebServiceXmlCCWSDDServiceName = "CAdxWebServiceXmlCC";
public java.lang.String getCAdxWebServiceXmlCCWSDDServiceName() {
return CAdxWebServiceXmlCCWSDDServiceName;
}
public void setCAdxWebServiceXmlCCWSDDServiceName(java.lang.String name) {
CAdxWebServiceXmlCCWSDDServiceName = name;
}
public com.adonix.www.WSS.CAdxWebServiceXmlCC getCAdxWebServiceXmlCC(String userName,String password) throws javax.xml.rpc.ServiceException {
java.net.URL endpoint;
try {
endpoint = new java.net.URL(CAdxWebServiceXmlCC_address);
}
catch (java.net.MalformedURLException e) {
throw new javax.xml.rpc.ServiceException(e);
}
return getCAdxWebServiceXmlCC(endpoint,userName,password);
}
public com.adonix.www.WSS.CAdxWebServiceXmlCC getCAdxWebServiceXmlCC(java.net.URL portAddress,String userName,String password) throws javax.xml.rpc.ServiceException {
try {
com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub _stub = new com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub(portAddress, this);
_stub.setPortName(getCAdxWebServiceXmlCCWSDDServiceName());
_stub.setPassword(password);
_stub.setUsername(userName);
return _stub;
}
catch (org.apache.axis.AxisFault e) {
return null;
}
}
public void setCAdxWebServiceXmlCCEndpointAddress(java.lang.String address) {
CAdxWebServiceXmlCC_address = address;
}
/**
* For the given interface, get the stub implementation.
* If this service has no port for the given interface,
* then ServiceException is thrown.
*/
public java.rmi.Remote getPort(Class serviceEndpointInterface) throws javax.xml.rpc.ServiceException {
try {
if (com.adonix.www.WSS.CAdxWebServiceXmlCC.class.isAssignableFrom(serviceEndpointInterface)) {
com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub _stub = new com.adonix.www.WSS.CAdxWebServiceXmlCCSoapBindingStub(new java.net.URL(CAdxWebServiceXmlCC_address), this);
_stub.setPortName(getCAdxWebServiceXmlCCWSDDServiceName());
return _stub;
}
}
catch (java.lang.Throwable t) {
throw new javax.xml.rpc.ServiceException(t);
}
throw new javax.xml.rpc.ServiceException("There is no stub implementation for the interface: " + (serviceEndpointInterface == null ? "null" : serviceEndpointInterface.getName()));
}
/**
* For the given interface, get the stub implementation.
* If this service has no port for the given interface,
* then ServiceException is thrown.
*/
public java.rmi.Remote getPort(javax.xml.namespace.QName portName, Class serviceEndpointInterface) throws javax.xml.rpc.ServiceException {
if (portName == null) {
return getPort(serviceEndpointInterface);
}
java.lang.String inputPortName = portName.getLocalPart();
if ("CAdxWebServiceXmlCC".equals(inputPortName)) {
return getCAdxWebServiceXmlCC();
}
else {
java.rmi.Remote _stub = getPort(serviceEndpointInterface);
((org.apache.axis.client.Stub) _stub).setPortName(portName);
return _stub;
}
}
public javax.xml.namespace.QName getServiceName() {
return new javax.xml.namespace.QName("http://www.adonix.com/WSS", "CAdxWebServiceXmlCCService");
}
private java.util.HashSet ports = null;
public java.util.Iterator getPorts() {
if (ports == null) {
ports = new java.util.HashSet();
ports.add(new javax.xml.namespace.QName("http://www.adonix.com/WSS", "CAdxWebServiceXmlCC"));
}
return ports.iterator();
}
/**
* Set the endpoint address for the specified port name.
*/
public void setEndpointAddress(java.lang.String portName, java.lang.String address) throws javax.xml.rpc.ServiceException {
if ("CAdxWebServiceXmlCC".equals(portName)) {
setCAdxWebServiceXmlCCEndpointAddress(address);
}
else
{ // Unknown Port Name
throw new javax.xml.rpc.ServiceException(" Cannot set Endpoint Address for Unknown Port" + portName);
}
}
/**
* Set the endpoint address for the specified port name.
*/
public void setEndpointAddress(javax.xml.namespace.QName portName, java.lang.String address) throws javax.xml.rpc.ServiceException {
setEndpointAddress(portName.getLocalPart(), address);
}
#Override
public CAdxWebServiceXmlCC getCAdxWebServiceXmlCC() throws ServiceException {
// TODO Auto-generated method stub
return null;
}
#Override
public CAdxWebServiceXmlCC getCAdxWebServiceXmlCC(URL portAddress) throws ServiceException {
// TODO Auto-generated method stub
return null;
}
}

Jade Agent Communication: Making the agent reply

I am doing a project MAS project on jade.
I have 2 agents one to send and one to receive.
How do i make agent 1 send a message to agent 2, for example "1000", and only when agent 2 receives the "1000", agent 2 will reply with for example, "turn off"?

My sugestion is to create agent1 with a RequestPerformer behaviour and agent2 with a CyclicBehaviour to listen messages.
agent1 behaviour content can be like this:
ACLMessage cfp = new ACLMessage(ACLMessage.CFP);
cfp.addReceiver(/*agent2AID*/);
cfp.setContent("1000");
cfp.setConversationId(1000);
cfp.setReplyWith("cfp" + System.currentTimeMillis()); // Unique value
myAgent.send(cfp);
mt = MessageTemplate.and(MessageTemplate.MatchConversationId(targetProduct),
MessageTemplate.MatchInReplyTo(cfp.getReplyWith()));
agent2 behaviour can be like this:
private class CFPServer extends CyclicBehaviour {
private static final long serialVersionUID = 1L;
public void action() {
MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.CFP);
ACLMessage msg = myAgent.receive(mt);
if (msg != null) {
// CFP Message received. Process it
String title = msg.getContent();
ACLMessage reply = msg.createReply();
// The requested fruit is NOT available for sale.
reply.setPerformative(ACLMessage.INFORM);
reply.setContent("turn off");
myAgent.send(reply);
} else {
block();
}
}
}
The related problem is very well discussed and solved in many ways, you can check out the following implementation of a simple Contract Net Protocol where you can find send and reply functions:
https://github.com/clebercbr/tp_cnp/blob/master/src/java/
See that the agent initiator is like agent1 and participant and rejector are like your agent2

I do not recommend to write a cyclic behaviour for messageReception, it will burn the proc for nothing. A simpleBehaviour with done() at false and a block() in the action() is much more efficient.
Regarding your pb, something like that should work :
public class ReceiveMessageBehaviour extends SimpleBehaviour{
private boolean finished=false;
/**
*
* This behaviour is a one Shot.
* It receives a message tagged with an inform performative, print the content in the console and destroy itself if its equal to 1000
* #param myagent
*/
public ReceiveMessageBehaviour(final Agent myagent) {
super(myagent);
}
public void action() {
//1) receive the message
final MessageTemplate msg Template = MessageTemplate.MatchPerformative(ACLMessage.INFORM);
final ACLMessage msg = this.myAgent.receive(msgTemplate);
//2) check its caracts
if (msg != null && msg.getContent().equals("1000")) {
System.out.println(this.myAgent.getLocalName()+"<----Result received from "+msg.getSender().getLocalName()+" ,content= "+msg.getContent());
this.finished=true;
//3) answer
final ACLMessage msg2 = new ACLMessage(ACLMessage.INFORM);
msg2.setSender(this.myAgent.getAID());
msg2.addReceiver(new AID(msg.getSender().getLocalName(), AID.ISLOCALNAME));
msg2.setContent("turn off");
this.myAgent.send(msg2);
}else{
block();// the behaviour goes to sleep until the arrival of a new message in the agent's Inbox.
}
}
public boolean done() { return finished;}
}

I'm new to these JADE related components. But I would like to add the simplest code that we can use to solve this problem using oneShotBehaviour and Cyclicehaviour.
The following code enables simple communication among two clients.
Agent A-Class:-
public class Agent_A extends Agent{
protected void setup(){
System.out.println(getAID().getName()+" is ready.");
addBehaviour(new AgentA_SendMessage());
addBehaviour(new AgentA_ReceiveMessage());
}
public class AgentA_SendMessage extends OneShotBehaviour{
#Override
public void action(){
ACLMessage msg = new ACLMessage(ACLMessage.REQUEST);
msg.addReceiver(new AID("AgentB",AID.ISLOCALNAME));
msg.setContent("1000");
send(msg);
}
}
public class AgentA_ReceiveMessage extends CyclicBehaviour{
Scanner scn2 = new Scanner(System.in);
#Override
public void action(){
ACLMessage remsg = myAgent.receive();
if(remsg!=null){
String reply = remsg.getContent();
System.out.println("Reply From "+remsg.getSender()+" :- "+reply);
}
else{
block();
}
}
}
}
Agent B Class:-
public class Agent_B extends Agent{
protected void setup(){
System.out.println("Hello Seller Agent : "+getAID().getName()+" is ready.");
addBehaviour(new AgentB_ReceiveMessage());
}
public class AgentB_ReceiveMessage extends CyclicBehaviour{
#Override
public void action(){
ACLMessage remsg = myAgent.receive();
if(remsg!=null){
System.out.println(""+remsg);
ACLMessage reply = remsg.createReply();
reply.setPerformative(ACLMessage.INFORM);
String price = remsg.getContent();
reply.setContent("off");
send(reply);
}else{
block();
}
}
}
}

Android app did not receive data from SignalR hub

I already read these topics:
how to use SignalR in Android
Android Client doesn't get data but .net client getting data from SignalR server
I write a simple chat system with Android that works with SignalR.
It is supposed to the clients send messages (by calling SendMessage method on the server) and the server should call the NewMessage method on the clients.
Here is my ChatHub class (simplified) written in C#.
public class ChatHub : Hub
{
// Store the clients connections Id
static readonly List<string> _connectedClients;
public override Task OnConnected()
{
// Keep connections id
// This section works fine and when the android device connects to the server,
// Its connection id will stored.
_connectedClients.Add(Context.ConnectionId)
//... other codes
}
public void SendMessage(string message)
{
foreach (var connectionId in _connectedClients)
{
// according to the logs
// android device connection id exists here
// and it works fine.
Clients.Client(connectionId).NewMessage(message);
}
}
}
When the android client connects to the server, On the OnConnected method, the connection id will be stored in the _connectedClients and it works fine.
In the SendMessage method of the ChatHub class, We have the android device connection id, and I'm sure that the android device is within the list
And here is my Andoird codes:
public class ChatActivity extends AppCompatActivity
{
// private fields
HubConnection connection;
HubProxy hub;
ClientTransport transport;
protected void onCreate(Bundle savedInstanceState) {
Logger logger = new Logger() {
#Override
public void log(String message, LogLevel logLevel) {
Log.e("SignalR", message);
}
};
Platform.loadPlatformComponent(new AndroidPlatformComponent());
connection = new HubConnection("192.168.1.100");
hub = connection.createHubProxy("chatHub"); // case insensitivity
transport = new LongPollingTransport(connection.getLogger());
// no difference when using this:
//transport = new ServerSentEventsTransport(connection.getLogger());
// this event never fired!
hub.subscribe(new Object() {
public void NewMessage(String message)
{
Log.d("<Debug", "new message received in subscribe"); // won't work!
}
}
// this event never fired!
hub.on("NewMessage", new SubscriptionHandler() {
#Override
public void run() {
Log.d("<Debug", "new message received in `on`"); // won't work!
}
});
// connect to the server that works fine.
SignalRFuture<Void> awaitConnection = connection.start(transport);
try {
awaitConnection.get(); // seems useless when using this or not!
}
catch (Exception ex) {
}
// this method works fine.
hub.invoke("sendMessage", "this is a test message to the server")
.done(new Action<Void>() {
#Override
public void run(Void aVoid) throws Exception {
Log.d("<Debug", "message sent."); // Works fine
}
});
}
}
In the above java code, invoking the sendMessage on the server works fine and the server get the messages.
But the only problem is that the hub.on(...) or hub.subscribe(...) events are never be called by the server.
In a simple description, My app can send message, but can not receive message from the others.
Any suggestion will be appreciated.

For the futures this is the way I finally achieved the answer (please first read the question android codes):
public class ChatActivity extends AppCompatActivity
{
// private fields
HubConnection connection;
HubProxy hub;
ClientTransport transport;
protected void onCreate(Bundle savedInstanceState) {
Logger logger = new Logger() {
#Override
public void log(String message, LogLevel logLevel) {
Log.e("SignalR", message);
}
};
Platform.loadPlatformComponent(new AndroidPlatformComponent());
connection = new HubConnection("192.168.1.100");
hub = connection.createHubProxy("chatHub"); // case insensitivity
/* ****new codes here**** */
hub.subscribe(this);
transport = new LongPollingTransport(connection.getLogger());
/* ****new codes here**** */
connection.start(transport);
/* ****new codes here**** */
/* ****seems useless but should be here!**** */
hub.subscribe(new Object() {
#SuppressWarnings("unused")
public void newMessage(final String message, final String messageId, final String chatId,
final String senderUserId, final String fileUrl, final String replyToMessageId) {
}
});
/* ********************** */
/* ****new codes here**** */
/* **** the main method that I fetch data from server**** */
connection.received(new MessageReceivedHandler() {
#Override
public void onMessageReceived(final JsonElement json) {
runOnUiThread(new Runnable() {
public void run() {
JsonObject jsonObject = json.getAsJsonObject();
Log.e("<Debug>", "response = " + jsonObject.toString());
}
});
}
});
/* ********************** */
}
}
!important note:
The priority of the codes is important. this is how I fix my problem in this topic.

You does not provider parameters in your client-side which should be same as your side-site. The code should be below:
hub.on("NewMessage", new SubscriptionHandler1<String>() {
#Override
public void run(String message) {
Log.d("<Debug", "new message received in `on`");
}
},String.class); //do not forget say the String class in the end

How Can I create,send and receive iq packets using smack(java)

I am connected to server(Xmpp)
but unable to send and receive packets at my psi client
Here is snippet of my code
POSClientIQ posclientiq = new POSClientIQ();
posclientiq.connectXMPPServer();
posclientiq.processMessage();
}
public void processMessage()
{ try{
final IQ iq1 = new IQ() {
public String getChildElementXML() {
return "<iq type='get' from ='sam'><query xmlns='jabber:iq:roster'></query></iq>";
}
};
iq1.setType(IQ.Type.GET);
// PacketCollector collector = connection.createPacketCollector(new PacketIDFilter(iq1.getPacketID()));
connection.sendPacket(iq1);
System.out.println("Message send");

The getChildElementXML() returns the tag. If you are using Smack then you don't need to write your own IQ implementation unless it is a custom query. For your case, to query the roster use RosterPacket.

If you have a custom query and you would like to use your IQ implementation then:
final IQ iq = new IQ() {
public String getChildElementXML() {
return "<query xmlns='http://jabber.org/protocol/disco#info'/>"; // here is your query
//this returns "<iq type='get' from='User#YourServer/Resource' id='info1'> <query xmlns='http://jabber.org/protocol/disco#info'/></iq>";
}};
// set the type
iq.setType(IQ.Type.GET);
// send the request
connection.sendPacket(iq);
As you can see you have here your custom query and you use Smack to set the rest of your IQ e.g. setting the type. Please note that Smack fills the "from" for you based on the JID your are logged into.

//To retrieve archive msges from server..
MyCustomIQ iq = new MyCustomIQ();
iq.setType(IQ.Type.set);
mConnection.sendIqWithResponseCallback(iq, new PacketListener() {
#Override
public void processPacket(Packet packet) throws SmackException.NotConnectedException {
Log.i("Send IQ with Response", "****** message " + packet);
}
}, new ExceptionCallback() {
#Override
public void processException(Exception exception) {
exception.printStackTrace();
Log.i("IO archjieve Exception",""+ exception.getMessage());
}
}, 5000);
mConnection.sendPacket(new Presence(Presence.Type.available));
PacketTypeFilter filter=new PacketTypeFilter(org.jivesoftware.smack.packet.Message.class);
PacketListener myListener=new PacketListener(){
public void processPacket(Packet packet){
if(((Message) packet).getType().equals(Message.Type.chat))
{
((Message) packet).getBody();
}
else if(((Message) packet).getType().equals(Message.Type.normal))
{
DefaultPacketExtension pacExten=PacketUtil.packetExtensionfromCollection(packet.getExtensions(), "result", "urn:xmpp:mam:0");
String strMsg=pacExten.getValue("body");
}
}
}
;
mConnection.addPacketListener(myListener, filter);
//My Custom IQ
class MyCustomIQ extends IQ {
String token;
protected MyCustomIQ() {
super("query","urn:xmpp:mam:0");
}
#Override
protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
// String queryId = prefix + Long.toString(new AtomicLong().incrementAndGet());
xml.attribute("queryid",queryId);
xml.rightAngleBracket();
return xml;
}
}
//You may get the response in PacketListerener sometimes so put debug in that also