我正试图从TOPICS中取消对持久用户的认可。
我的应用是一种社交网络:每个用户都是其他用户的主题。因此,每次用户做某事时,都会通知他的朋友。当然,订阅者可以取消订阅主题,希望不再接收关于用户的通知。
每次我试图从主题中取消订阅订阅者时,我都会收到错误消息告诉我:&#34; javax.jms.JMSException:正在使用持久消费者< /强>&#34;
以下是我的2个课程,SENDER课程和RECEIVER课程。谁能告诉我我做错了什么?
SENDER课程:
package com.citizenweb.classes;
import java.util.Date;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageFormatException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.jms.ObjectMessage;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQSession;
import com.citizenweb.interfaces.PostIF;
import com.citizenweb.interfaces.UserIF;
public class Sender {
private ActiveMQConnectionFactory factory = null;
private ActiveMQConnection connection = null;
private ActiveMQSession session = null;
private Destination destination = null;
private MessageProducer producer = null;
public Sender() {
}
public void connect(){
try{
factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_BROKER_URL);
// TODO Mécanisme de sécurité d'ActiveMQ à rétablir en production
factory.setTrustAllPackages(true);
connection = (ActiveMQConnection) factory.createConnection();
connection.start();
session = (ActiveMQSession) connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
} catch (JMSException e){
e.printStackTrace();
}
}
public void sendPost(UserIF user,PostIF post) {
if(session==null){connect();}
try {
destination = session.createTopic(user.toString());
producer = session.createProducer(destination);
ObjectMessage postMessage = session.createObjectMessage();
postMessage.setObject(post);
producer.send(postMessage);
System.out.println("\n SENDER Object message sent");
} catch (MessageFormatException e) {
e.printStackTrace();
} catch (JMSException e) {
e.printStackTrace();
}
}
public void sendInformation(UserIF user,String info){
if(session==null){connect();}
try {
destination = session.createTopic(user.toString());
producer = session.createProducer(destination);
TextMessage infoMessage = session.createTextMessage();
infoMessage.setText(info);
producer.send(infoMessage);
System.out.println("\n SENDER Information message sent");
} catch (JMSException e) {
e.printStackTrace();
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
UserIF u1, u2, u3;
String[] nom = new String[5];
String[] prenom = new String[5];
String[] login = new String[5];
String[] password = new String[5];
Date[] naiss = new Date[5];
String[] mail = new String[5];
for (int i = 0; i < 5; i++) {
nom[i] = "nom_" + i;
prenom[i] = "prenom_" + i;
login[i] = "login_" + i;
password[i] = "password_" + i;
naiss[i] = new Date();
mail[i] = "mail_" + i;
}
System.out.println("\n SENDER AFFECTATION DES NOMS");
u1 = new User(nom[0], prenom[0], login[0], password[0], naiss[0], mail[0]);
u2 = new User(nom[1], prenom[1], login[1], password[1], naiss[1], mail[1]);
u3 = new User(nom[2], prenom[2], login[2], password[2], naiss[2], mail[2]);
Sender sender = new Sender();
sender.sendInformation(u1, "U1 notification");
sender.sendInformation(u2, "U2 notification");
sender.sendInformation(u3, "U3 notification");
//PostIF post = new Post("Mon Post","Ceci est mon message",u1,u1,"Classe Sender",((User) u1).getIdUser(),0);
//sender.sendPost(user, post);
sender.session.close();
sender.connection.close();
}
}
RECEIVER课程:
package com.citizenweb.classes;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.broker.region.Destination;
import com.citizenweb.interfaces.PostIF;
import com.citizenweb.interfaces.UserIF;
import com.citizenweb.classes.Post;
public class Receiver implements MessageListener, Serializable {
private static final long serialVersionUID = 1L;
private ActiveMQConnectionFactory factory = null;
private ActiveMQConnection connection = null;
private ActiveMQSession session = null;
private Topic destination = null;
private MessageConsumer consumer = null;
UserIF userTopic = new User();
UserIF userSubscriber = new User();
List<Message> listeMsg = new ArrayList<Message>();
public Receiver(UserIF subscriber) {
this.userSubscriber = subscriber;
}
public void connect() {
try {
factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_BROKER_URL);
// TODO Mécanisme de sécurité d'ActiveMQ à rétablir en production
factory.setTrustAllPackages(true);
connection = (ActiveMQConnection) factory.createConnection();
// ClientID :
// https://qnalist.com/questions/2068823/create-durable-topic-subscriber
connection.setClientID(userSubscriber.toString());
connection.start();
session = (ActiveMQSession) connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
} catch (JMSException e) {
e.printStackTrace();
}
}
public void receiveMessage(UserIF topic) {
try {
if (session == null) {
connect();
}
destination = session.createTopic(topic.toString());
String nomAbonnement = topic.toString() + "->" + userSubscriber.toString();
//String nomAbonnement = userSubscriber.toString();
consumer = session.createDurableSubscriber(destination, nomAbonnement);
consumer.setMessageListener(this);
} catch (JMSException e) {
e.printStackTrace();
}
}
public void unsubscribe(UserIF topic) {
try {
if (session == null) {
connect();
}
System.out.println("\n RECEIVER Désinscription du topic " + topic.toString());
//consumer.close();
String nomAbonnement = topic.toString() + "->" + userSubscriber.toString();
//String nomAbonnement = userSubscriber.toString();
System.out.println("\n RECEIVER Abonnement à clore = " + nomAbonnement);
session.unsubscribe(nomAbonnement);
System.out.println("\n RECEIVER " + userSubscriber.toString() + " s'est désinscrit de " + nomAbonnement);
} catch (JMSException e) {
e.printStackTrace();
}
}
@Override
public void onMessage(Message message) {
System.out.println("\n RECEIVER OnMessage triggered for " + userSubscriber.toString());
listeMsg.add(message);
System.out.println("\n RECEIVER Nombre de messages reçus par " + userSubscriber + " = " + listeMsg.size());
String classe = message.getClass().getSimpleName();
System.out.println("\n RECEIVER Classe de message : " + classe);
try {
if (message instanceof TextMessage) {
TextMessage text = (TextMessage) message;
System.out.println("\n RECEIVER Information : " + text.getText());
}
if (message instanceof ObjectMessage) {
System.out.println("\n RECEIVER ObjectMessage");
ObjectMessage oMessage = (ObjectMessage) message;
if (oMessage.getObject() instanceof PostIF) {
PostIF post = (PostIF) oMessage.getObject();
String s = ((Post) post).getCorpsMessage();
System.out.println("\n RECEIVER Post : " + s);
}
}
} catch (JMSException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws JMSException {
/*
* EACH USER IS A TOPIC FOR OTHER USERS
* WHATEVER A USER DOES RESULTS IN A NOTIFICATION TO SUBSCRIBERS
*/
//CREATE USER
UserIF u1, u2, u3;
String[] nom = new String[5];
String[] prenom = new String[5];
String[] login = new String[5];
String[] password = new String[5];
Date[] naiss = new Date[5];
String[] mail = new String[5];
for (int i = 0; i < 5; i++) {
nom[i] = "nom_" + i;
prenom[i] = "prenom_" + i;
login[i] = "login_" + i;
password[i] = "password_" + i;
naiss[i] = new Date();
mail[i] = "mail_" + i;
}
u1 = new User(nom[0], prenom[0], login[0], password[0], naiss[0], mail[0]);
u2 = new User(nom[1], prenom[1], login[1], password[1], naiss[1], mail[1]);
u3 = new User(nom[2], prenom[2], login[2], password[2], naiss[2], mail[2]);
/*
* MAKE EACH USER A SUBSCRIBER
*/
Receiver receiver1 = new Receiver(u1);
Receiver receiver2 = new Receiver(u2);
Receiver receiver3 = new Receiver(u3);
/*
* PUT A MESSAGE LISTENER FOR EACH USER
*/
receiver1.receiveMessage(u2);
receiver1.receiveMessage(u3);
receiver2.receiveMessage(u1);
receiver2.receiveMessage(u3);
receiver3.receiveMessage(u1);
receiver3.receiveMessage(u2);
/*
* CALL THE SENDER CLASS TO SEND MESSAGES
*/
try {
Sender.main(args);
} catch (Exception e1) {
e1.printStackTrace();
}
/*
* A SLEEP TO HAVE ENOUGH TIME TO LOOK AT THE ACTIVEMQ CONSOLE
* CAN BE REMOVE
*/
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return;
}
/*
* UNSUBSCRIBE SUBSCRIBERS FROM TOPICS
*/
receiver1.unsubscribe(u2);
receiver1.unsubscribe(u3);
receiver2.unsubscribe(u1);
receiver2.unsubscribe(u3);
receiver3.unsubscribe(u1);
receiver3.unsubscribe(u2);
}
}
答案 0 :(得分:1)
如果目前没有活跃订阅者,您只能取消订阅持久订阅。看起来您的代码创建了多个订阅并且不会阻止消费者,因此取消订阅当然会失败,如果您关闭消费者然后取消订阅,您应该得到您正在寻找的结果。
持久订阅取消订阅的示例是here。
答案 1 :(得分:1)
每个连接都需要唯一的ClientID : connection.setClientID(“clientID”);
我的错误是误解了某个客户的这种独特性。
当客户订阅主题时,此主题有一个连接。因此,对于订阅3个主题的给定客户端(例如),需要3个ClientID,因为需要3个连接。 ClientID必须是唯一的,因为它为一个主题标识一个客户端的一个连接。
这就是为什么当我想结束其订阅时,我有这么多public final class WritableMessage {
private static final int HEADER_MAX_SIZE = 1024;
private final String messageId;
private String textBody;
private string extraContent;// added here for passing img url
private List<String> recipientIds;
private Map<String, String> headers;
private int headerSize;
public WritableMessage(String recipientUserId, String textBody, extraContent) {
this();
this.addExtra(extraContent); // but the sinch doesnt allow overide
this.addRecipient(recipientUserId);
this.setTextBody(textBody);
}
告诉“耐用消费者正在使用”。