basic chat

Author: Michalis-Dragoutas

pom.xml

@@ -45,6 +45,16 @@
             <artifactId>javafx-fxml</artifactId>
             <version>${javafx.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.github.cdimascio</groupId>
+            <artifactId>dotenv-java</artifactId>
+            <version>3.2.0</version>
+        </dependency>
+        <dependency>
+            <groupId>tools.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>3.0.1</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

src/main/java/com/example/HelloController.java

@@ -1,7 +1,10 @@
 package com.example;
 
+import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.control.Label;
+import javafx.scene.control.ListView;
+import javafx.scene.control.TextField;
 
 /**
  * Controller layer: mediates between the view (FXML) and the model.
@@ -10,13 +13,26 @@ public class HelloController {
 
     private final HelloModel model = new HelloModel();
 
+    @FXML
+    public ListView<NtfyMessageDto> messageView ;
+
     @FXML
     private Label messageLabel;
 
+    @FXML
+    private TextField messageField;
+
     @FXML
     private void initialize() {
-        if (messageLabel != null) {
-            messageLabel.setText(model.getGreeting());
+        messageLabel.setText(model.getGreeting());
+        messageView.setItems(model.getMessages());
+    }
+
+    public void sendMessage(ActionEvent actionEvent) {
+        String text = messageField.getText().trim();
+        if (!text.isEmpty()) {
+            model.sendMessage(text);
+            messageField.clear();
         }
     }
 }

src/main/java/com/example/HelloFX.java

@@ -1,5 +1,6 @@
 package com.example;
 
+import io.github.cdimascio.dotenv.Dotenv;
 import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Parent;
@@ -10,6 +11,7 @@ public class HelloFX extends Application {
 
     @Override
     public void start(Stage stage) throws Exception {
+
         FXMLLoader fxmlLoader = new FXMLLoader(HelloFX.class.getResource("hello-view.fxml"));
         Parent root = fxmlLoader.load();
         Scene scene = new Scene(root, 640, 480);

src/main/java/com/example/HelloModel.java

@@ -1,9 +1,40 @@
 package com.example;
 
+import io.github.cdimascio.dotenv.Dotenv;
+import javafx.application.Platform;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import tools.jackson.databind.ObjectMapper;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.Objects;
+
 /**
  * Model layer: encapsulates application data and business logic.
  */
 public class HelloModel {
+
+    private final String hostName;
+    private final HttpClient http = HttpClient.newHttpClient();
+    private final ObjectMapper mapper = new ObjectMapper();
+    private final ObservableList<NtfyMessageDto> messages = FXCollections.observableArrayList();
+
+    private boolean senderMe=false;
+
+    public HelloModel() {
+        Dotenv dotenv = Dotenv.load();
+        hostName = Objects.requireNonNull(dotenv.get("HOST_NAME"));
+        receiveMessage();
+    }
+
+    public ObservableList<NtfyMessageDto> getMessages() {
+        return messages;
+    }
+
     /**
      * Returns a greeting based on the current Java and JavaFX versions.
      */
@@ -12,4 +43,55 @@ public String getGreeting() {
         String javafxVersion = System.getProperty("javafx.version");
         return "Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".";
     }
+
+    public void sendMessage(String text) {
+
+        senderMe=true;
+
+        HttpRequest httpRequest= HttpRequest.newBuilder()
+                .POST(HttpRequest.BodyPublishers.ofString("Hello world"))
+                .uri(URI.create(hostName + "/mytopic"))
+                .build();
+        http.sendAsync(httpRequest, HttpResponse.BodyHandlers.discarding())
+                .exceptionally(ex -> {
+                    System.out.println("Error sending message: " + ex.getMessage());
+                    return null;
+                });
+        try {
+            var response = http.send(httpRequest, HttpResponse.BodyHandlers.ofString());
+        } catch (IOException e) {
+            System.out.println("Error sending message");
+        } catch (InterruptedException e) {
+            System.out.println("Interrupted sending request");
+        }
+
+    }
+
+    public void receiveMessage(){
+        HttpRequest httpRequest = HttpRequest.newBuilder()
+                .GET()
+                .uri(URI.create(hostName + "/mytopic/json"))
+                .build();
+
+        http.sendAsync(httpRequest, HttpResponse.BodyHandlers.ofLines())
+                .thenAccept(response -> response.body()
+                        .map(s -> {
+                            try {
+                                return mapper.readValue(s, NtfyMessageDto.class);
+                            } catch (Exception e) {
+                                System.err.println("Failed to parse message: " + e.getMessage());
+                                return null;
+                            }
+                        })
+                        .filter(Objects::nonNull)
+                        .filter(msg -> "message".equals(msg.event()))
+                        .forEach(msg->{
+                            if (senderMe) {
+                                senderMe=false;
+                                return;
+                            }
+                        Platform.runLater(() -> messages.add(msg));
+                        }));
+    }
+
 }

src/main/java/com/example/ManyParameters.java

@@ -0,0 +1,20 @@
+package com.example;
+
+public class ManyParameters {
+
+    public ManyParameters(String computerName, int timeout, String method, int size, byte[] data) {
+
+    }
+
+    static void main () {
+
+        ManyParametersBuilder builder= new ManyParametersBuilder();
+        builder
+                .setComputerName("localhost")
+                .setTimeout(10)
+                .setSize(0)
+                .createManyParameters();
+    }
+
+
+}

src/main/java/com/example/ManyParametersBuilder.java

@@ -0,0 +1,38 @@
+package com.example;
+
+public class ManyParametersBuilder {
+    private String computerName;
+    private int timeout = 0;
+    private String method;
+    private int size = 0;
+    private byte[] data = null;
+
+    public ManyParametersBuilder setComputerName(String computerName) {
+        this.computerName = computerName;
+        return this;
+    }
+
+    public ManyParametersBuilder setTimeout(int timeout) {
+        this.timeout = timeout;
+        return this;
+    }
+
+    public ManyParametersBuilder setMethod(String method) {
+        this.method = method;
+        return this;
+    }
+
+    public ManyParametersBuilder setSize(int size) {
+        this.size = size;
+        return this;
+    }
+
+    public ManyParametersBuilder setData(byte[] data) {
+        this.data = data;
+        return this;
+    }
+
+    public ManyParameters createManyParameters() {
+        return new ManyParameters(computerName, timeout, method, size, data);
+    }
+}

src/main/java/com/example/NtfyMessageDto.java

@@ -0,0 +1,20 @@
+package com.example;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.text.SimpleDateFormat;
+import java.time.format.DateTimeFormatter;
+import java.util.Date;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public record NtfyMessageDto(String id, long time, String event, String topic, String message){
+    private static final DateTimeFormatter date =
+            DateTimeFormatter.ofPattern("HH:mm");
+    @Override
+    public String toString(){
+        String timeStr = new SimpleDateFormat("HH:mm").format(new Date(time * 1000));
+        return timeStr+ "  " + message ;
+    }
+
+
+}

src/main/java/com/example/Singelton.java

@@ -0,0 +1,11 @@
+package com.example;
+
+public  class Singelton {
+
+    private final static   Singelton instance= new Singelton();
+
+    public static Singelton getInstance(){
+        return instance;
+    }
+
+}

src/main/java/module-info.java

@@ -1,6 +1,9 @@
 module hellofx {
     requires javafx.controls;
     requires javafx.fxml;
+    requires io.github.cdimascio.dotenv.java;
+    requires java.net.http;
+    requires tools.jackson.databind;
 
     opens com.example to javafx.fxml;
     exports com.example;

src/main/resources/com/example/hello-view.fxml

@@ -1,9 +1,21 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<?import javafx.scene.layout.StackPane?>
-<?import javafx.scene.control.Label?>
 
-<StackPane xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml" fx:controller="com.example.HelloController">
-    <children>
-        <Label fx:id="messageLabel" text="Hello, JavaFX!" />
-    </children>
-</StackPane>
+<?import javafx.geometry.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<VBox prefHeight="482.0" prefWidth="248.0" spacing="5.0" xmlns="http://javafx.com/javafx/17.0.12" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.HelloController">
+    <Label fx:id="messageLabel" text="CHAT LAB3" />
+    <ListView fx:id="messageView" prefHeight="373.0" prefWidth="248.0" VBox.vgrow="ALWAYS" />
+
+<HBox spacing="10.0">
+    <TextField fx:id="messageField" prefHeight="50.0" prefWidth="187.0" promptText="Type your message..." HBox.hgrow="ALWAYS">
+         <HBox.margin>
+            <Insets bottom="5.0" left="5.0" />
+         </HBox.margin></TextField>
+    <Button onAction="#sendMessage" prefHeight="34.0" prefWidth="51.0" text="Send">
+         <HBox.margin>
+            <Insets right="2.0" />
+         </HBox.margin></Button>
+</HBox>
+</VBox>