SpringBoot 嵌入 HornetQ 集群不转发消息

http://docs.jboss.org/hornetq/2.2.5.Final/user-manual/en/html/architecture.html#d0e595

"HornetQ core is designed as a set of simple POJOs so if you have an application that requires messaging functionality internally but you don't want to expose that as a HornetQ server you can directly instantiate and embed HornetQ servers in your own application."

If you are embedding it, you aren't exposing it as a server. Each of your containers has a seperate instance. It is the equivalent of starting up 2 copies of hornet and giving them the same queue name. One writes to that queue on the first instance and the other listens to the queue on the second instance.

If you want to decouple your apps in this way, you need to have a single place that is acting as a server. Probably, you want to cluster. This isn't specific to Hornet, BTW. You'll find this pattern often.

FILTER

package it.unitn.disi.webdev.claudiovigliarolo;


import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


@WebFilter(filterName = "AuthenticationFilter", urlPatterns = { "/*" })
public class AuthenticationFilter implements Filter {
private ServletContext context;


public void init(FilterConfig fConfig) throws ServletException {
this.context = fConfig.getServletContext();
this.context.log("AuthenticationFilter initialized");
}


public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)


throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
String uri = req.getRequestURI();
HttpSession session = req.getSession(false);
boolean isLoggedIn = session != null && session.getAttribute("username") != null;


if (!isLoggedIn && !uri.endsWith("start.jsp")) {
res.sendRedirect("start.jsp");


} else {
chain.doFilter(request, response);
}
}


public void destroy() {
// close any resources here
}
}<filter-mapping><filter-name>AuthenticationFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


@WebServlet(name = "GetItems", urlPatterns = { "/GetItems" })
public class GetItems extends HttpServlet {


String dbURL = "jdbc:derby://localhost:1527/ExamDerbyDB";
String user = "WEBENGINE";
String password = "WEBENGINE";
Connection conn = null;


@Override
public void init() {
try {
Class.forName("org.apache.derby.jdbc.ClientDriver");
conn = DriverManager.getConnection(dbURL, user, password);
} catch (ClassNotFoundException | SQLException ex) {
ex.printStackTrace();


}
}


@Override
public void destroy() {
try {
if (conn != null) {
conn.close();
}
} catch (SQLException ex) {
System.err.println("Database connection problem: can't close connection");


}
}


@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setContentType("text/html;charset=UTF-8");
String username = request.getParameter("username");
String password = request.getParameter("password");


StringBuilder ret = new StringBuilder();


ArrayList<String> inserted = getAllItemsFromDB();


String jsonResponse = getListJson(inserted);
response.setContentType("application/json;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {


out.println(jsonResponse);
}
}


private ArrayList<String> getAllItemsFromDB() throws ServletException {
ArrayList elements = new ArrayList();
        

PreparedStatement stm = null;
ResultSet result = null;
        

try {
String query = "SELECT USERNAME FROM USERS";
stm = conn.prepareStatement(query);
result = stm.executeQuery();
while(result.next()) {
String string = result.getString(1);
elements.add(string);
}
stm.close();
result.close();


} catch (SQLException ex) {
System.err.println("Database connection problem");
} finally {
try {
if(stm != null) stm.close();
if(result != null) result.close();
} catch (SQLException ex) {
System.err.println("Database connection problem: can't close statement/result");
}
        

return elements;
}


public String getListJson(ArrayList<String> list) {
if (list.size() == 0)
return null;
StringBuilder ret = new StringBuilder("[");
String prefix = "";
for (int i = 0; i < list.size(); i++) {
StringBuilder sb = new StringBuilder();
ret.append(prefix);
prefix = ",";
ret.append(sb.append("{\"message\":\"").append(list.get(i)).append("\"}").toString());
}
ret.append("]");
return ret.toString();
}
}

class.java

public class MessageList {
protected final LinkedList<Message> list;


public MessageList() {
this.list = new LinkedList<>();
}


public void addMessage(Message m) {
this.list.add(m);
}


public void deleteMessage(String message_id) {
for (Message a : list) {
if (a.message_id.equals(message_id)) {
list.remove(a);
}
}
}


public Message getMessage(String message_id) {
for (Message a : list) {
if (a.message_id.equals(message_id)) {
return a;
}
}
return null;


}


public void addLike(String message_id) {
for (Message a : list) {
if (a.message_id.equals(message_id)) {
a.isLiked++;
}
}
}


StringBuilder ret = new StringBuilder("[");
String prefix = "";for(
int i = 0;i<list.size();i++)
{
Message m = list.get(i);
ret.append(prefix);
prefix = ",";
ret.append(m.toJson());
}ret.append("]");


return ret.toString();
}


public String getListJson()
{
if(list.size() == 0)
{
return null;
}
        

StringBuilder ret = new StringBuilder("[");
String prefix = "";
for(int i=0; i<list.size(); i++) {
StringBuilder sb = new StringBuilder();
ret.append(prefix);
prefix = ",";
ret.append(sb.append("{\"message\":\"").append(list.get(i)).append("\"}").toString());
}
ret.append("]");
        

return ret.toString();
}
}

form

<!DOCTYPE html>
<html lang="en">
<body>
<script>
function validateForm(form) {
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
var error = document.getElementById("error");
error.innerHTML = "";
if (username === "" || password == "") {
form.reset();
error.innerHTML = "password / username empty";
return false;
}
return true;
}
</script>


<div class="container" style="width: 500px; float: left">
<h2 class="text-center">Welcome to the App</h2>
<form
id="registerForm"
method="POST"
onsubmit="return validateForm(this)"
action="Registration"
>
<div class="form-group">
<label for="username">Username:</label>
<input
type="text"
class="form-control"
id="username"
placeholder="Enter email"
name="username"
/>
</div>
<div class="form-group">
<label for="password">Password:</label>
<input
type="password"
class="form-control"
id="password"
placeholder="Enter password"
name="password"
/>
</div>
<div class="form-group form-check"></div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
<div id="error" class="alert" role="alert"></div>
</div>
</body>
</html>

general

//servelet context
ServletContext application=getServletContext();
application.setAttribute("messages", messages);






//SESSION
HttpSession session = request.getSession();
String name = (String) request.getParameter("username");
session.setAttribute("username", name);




//random id java
String uniqueID = UUID.randomUUID().toString();


//package
it.unitn.disi.webdev.claudiovigliarolo


//project name
VIGLIAROLO_C_202314


//get contextpath
String contextPath = request.getContextPath();
System.out.println("Context Path = " + contextPath);
response.sendRedirect(contextPath + "/main.html");




//BOOTstrap
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>






//redirect to other page
window.location.replace("http://stackoverflow.com");






//CONTENT type
response.setContentType("application/json;charset=UTF-8");
response.setContentType("text/html;charset=UTF-8");












//zuccherino
protected final LinkedList<Message> list;
    

public MessageList() {
this.list = new LinkedList<>();
}






<!DOCTYPE html>
<html lang="en">
<body>
<script>
function validateForm(form) {
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
var error = document.getElementById("error");
error.innerHTML = "";
if(username === "" || password == "") {
form.reset();
error.innerHTML = "password / username empty";
return false;
}
return true;
}
</script>


<div class="container " style="width:500px; float: left;">
   

<h2 class="text-center">Welcome to the App</h2>
<form id="registerForm" method="POST" onsubmit="return validateForm(this)" action="Registration">
<div class="form-group">
<label for="username">Username:</label>
<input type="text" class="form-control" id="username" placeholder="Enter email" name="username">
</div>
<div class="form-group">
<label for="password">Password:</label>
<input type="password" class="form-control" id="password" placeholder="Enter password" name="password">
</div>
<div class="form-group form-check">
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
<div id="error" class="alert" role="alert">
  

</div>
</div>
</body>
</html>




//change styles
const val =  keywords.some(k=>item.message.includes(k));
const color = val ? "#FFFF00;" : "transparent;";
document.getElementById("data").innerHTML +=
"<div style=' margin-top:50px;flexdirection: row; display:flex; width:500px; background:" + color + "; justify-content: row; '>" +
item.message +
"</div>";




//setimeout
function refresh() {
// make Ajax call here, inside the callback call:
setTimeout(refresh, 5000);
// ...
}
// initial call, or just call refresh directly
setTimeout(refresh, 5000);




//template strings
`string text`

getclaudio postclaudio

<script>
function onSendData() {
var title = document.getElementById("username").value;
var description = document.getElementById("password").value;
console.log(title, description);
var http = new XMLHttpRequest();
var url = "Registration";
var params = "password=" + description + "&username=" + title;
http.open("POST", url, true);
//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.onreadystatechange = function () {
//Call a function when the state changes.
if (http.readyState == 4 && http.status == 200) {
console.log("res", http.responseText);
}
};
http.send(params);
}
</script>
------GET---------------
//loadData noparam
<script>


loadData();


function loadData() {
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "GetProducts", true);
xhttp.responseType = "json";
xhttp.onreadystatechange = function () {
var done = 4,
ok = 200;
if (this.readyState === done && this.status === ok) {
my_JSON_object = this.response;
console.log("response", my_JSON_object);
document.getElementById("data").innerHTML = "";
my_JSON_object && my_JSON_object.forEach((item) => {
console.log("item", item.message);
document.getElementById("data").innerHTML +=
" <div class='card' style='width: 300px; margin-top:50px;'>" +
"<div class='card-body'>" +
" <h4 class='card-title'>" + item.name + "</h4>" +
"<p class='card-text'>" + item.description + "</p>" +
"  <p class='card-text'>Price: " + item.price + " $</p>" +
"    <a href='detail.html?name=" + item.name + "' class='card-link' >View details</a>" +
"   </div>    </div>";
});
}
};
xhttp.send();
}
</script>
<div id="data"></div>


//loadData withparam
<script>
function getData() {
const urlParams = new URLSearchParams(window.location.search);
const id = urlParams.get('id');
const id2 = urlParams.get('id2');


console.log(id)
var url = "GetItems";
let param1 = id;
let param2 = id2;
var params = "param1=" + param1 + "&param2=" + param2;
var http = new XMLHttpRequest();
http.open("GET", url + "?" + params, true);
http.responseType = "json";
http.onreadystatechange = function () {
var done = 4,
ok = 200;
if (this.readyState === done && this.status === ok) {
my_JSON_object = this.response;
console.log("response", my_JSON_object);
document.getElementById("data").innerHTML = "";
my_JSON_object && my_JSON_object.forEach((item) => {
console.log("item", item.message);
document.getElementById("data").innerHTML +=
"<div style=' margin-top:50px;flexdirection: row; display:flex; width:500px; justify-content: row; '>" +
item.message +
"</div>";
});
}
};
http.send(null);
}
</script>
<div id="data"></div>














<div class="card" style="margin-top: 50px;">
<div class="card-body">Content</div>
</div>




//render multiple parameters
onclick="showData('${item.name}', '${item.price}', '${item.punteggio}', '${item.extra}' )"

JSON servelet claudio

RETURN JSON
//create simple json response
response.setContentType("application/json;charset=UTF-8");
StringBuilder ret = new StringBuilder();
ret.append("{\"ready\":\"").append("false").append("\"}");
try (PrintWriter out = response.getWriter()) {
out.println(ret.toString());
}


JSON LIST CLASS
public String toJSON() {
StringBuilder ret = new StringBuilder("[");
String prefix = "";
for(int i=0; i<list.size(); i++) {
Message m = list.get(i);
ret.append(prefix);
prefix = ",";
ret.append(m.toJson());
}
ret.append("]");
System.err.println("priting tojson"+ ret.toString());
return ret.toString();
}




JSON ITEM
public String toJson() {
StringBuilder ret = new StringBuilder();
ret.append("{\"id\":\"").append(this.id).append("\",");
ret.append("\"nome\":\"").append(this.nome).append("\",");
ret.append("\"imgName\":\"").append(this.imgName).append("\"}");
return ret.toString();
}








STRING LIST
public String wordsToJSON(ArrayList<String> list) {
System.err.println("lunghezza" + list.size());
if (list.size() == 0) {
return null;
}
StringBuilder ret = new StringBuilder("[");
String prefix = "";
for (int i = 0; i < list.size(); i++) {
StringBuilder sb = new StringBuilder();
ret.append(prefix);
prefix = ",";
ret.append(sb.append("{\"message\":\"").append(list.get(i)).append("\"}").toString());
}


ret.append("]");
System.err.println("jjj" + ret.toString());
return ret.toString();
}


}
JSON RESPONSE OK
ServletContext application=getServletContext();
MappaDiCoppie mappaDiCoppie =  (MappaDiCoppie) application.getAttribute("mappaDiCoppie");
HttpSession session= request.getSession();
String username = (String) session.getAttribute("username");
StringBuilder ret = new StringBuilder();
if(mappaDiCoppie != null && username != null)
{
if(mappaDiCoppie.exists(username))
//ok
ret.append("{\"ready\":\"").append("true").append("\"}");
else
//no wait
ret.append("{\"ready\":\"").append("false").append("\"}")
try (PrintWriter out = response.getWriter()) {
out.println(ret.toString());
}
}




```

stylesheet

 <link rel="stylesheet" href="./styles/styles.css">
<script type="text/javascript" src="./js/script.js"></script>

matrix html

 const N = 9;
const container = document.getElementById("container");


function makeRows(rows, cols) {
container.style.setProperty('--grid-rows', rows);
container.style.setProperty('--grid-cols', cols);
for (c = 0; c < (cols); c++) {
for (r = 0; r < rows; r++) {
const myid = JSON.stringify({x: r, y: c});
let cell = document.createElement("div");
var textnode = document.createElement("span");
textnode.setAttribute("id", myid);
cell.appendChild(textnode);
cell.onclick = function (event) {
showVal(myid, r, c);
}
//cell.innerText = (c + 1);
container.appendChild(cell).className = "grid-item";
container.appendChild(cell).style = "border-color: red";
container.appendChild(cell).style = "border-width: 4px";


}
;
}
}


//styles


.myinput{
width: 50px;
margin-right: 20px;
}




#container {
display: grid;
grid-gap: .5em;
grid-template-rows: repeat(var(--grid-rows), 1fr);
grid-template-columns: repeat(var(--grid-cols), 1fr);
width: 100px;
}


.grid-item {
border: 1px solid #ddd;
text-align: center;
width: 50px;
height: 50px;
border-width: 2px;
border-color: green;
  

}

grid java

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package utils;


import java.util.ArrayList;
import java.util.Random;


/**
*
* @author claud
*/
public class Grid {


int N;
Cell[][] matrix;


public Grid(int N) {
this.N = N;
this.matrix = new Cell[N][N];
}


private int getRandom() {
Random rn = new Random();
int range = 0 - 0 + 1;
int randomNum = rn.nextInt(N) + 0;
return randomNum;
}


public int getValue(int x, int y) {
if (x < N && y < N) {
return this.matrix[x][y].value;
} else {
return -2;
}
}


public void generate() {
System.err.println("ffffffffffffggg");


//fai il ciclo completo
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
this.matrix[i][j] = new Cell(i, j, 0);//aggiungi bombe con random altrimenti valore 0
}
}
}




public void print() {
System.err.println("printiiiiiiiiiiiing START");
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
System.err.println(this.matrix[i][j].value);
}
}
}
}