change WebSocketMessage data type

src/main/java/telraam/logic/positioner/PositionSender.java

@@ -1,31 +1,20 @@
 package telraam.logic.positioner;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import lombok.NoArgsConstructor;
 import telraam.websocket.WebSocketMessage;
 import telraam.websocket.WebSocketMessageSingleton;
 
 import java.util.List;
-import java.util.logging.Logger;
 
 public class PositionSender {
-    private static final Logger logger = Logger.getLogger(PositionSender.class.getName());
-    private final ObjectMapper mapper = new ObjectMapper();
-    private final WebSocketMessage message = new WebSocketMessage();
+    private final WebSocketMessage<List<Position>> message = new WebSocketMessage<>();
 
     public PositionSender() {
         this.message.setTopic("position");
     }
 
-    public void send(List<Position> position) {
-        try {
-            String json = mapper.writeValueAsString(position);
-            this.message.setData(json);
-            WebSocketMessageSingleton.getInstance().sendToAll(this.message);
-        } catch (JsonProcessingException e) {
-            logger.severe("Json conversion error for \"%s\"".formatted(position.toString()));
-        }
+    public void send(List<Position> positions) {
+        this.message.setData(positions);
+        WebSocketMessageSingleton.getInstance().sendToAll(this.message);
     }
 
 }

src/main/java/telraam/websocket/WebSocketMessage.java

@@ -4,7 +4,7 @@
 import lombok.Setter;
 
 @Getter @Setter
-public class WebSocketMessage {
+public class WebSocketMessage<T> {
     private String topic;
-    private String data;
+    private T data;
 }

src/main/java/telraam/websocket/WebSocketMessageSingleton.java

@@ -18,7 +18,7 @@ public class WebSocketMessageSingleton {
     @Getter
     private static final WebSocketMessageSingleton instance = new WebSocketMessageSingleton();
     private static final Set<WebSocketConnection> registeredConnections = new HashSet<>();
-    private ObjectMapper mapper = new ObjectMapper();
+    private final ObjectMapper mapper = new ObjectMapper();
 
     public void registerConnection(WebSocketConnection conn) {
         boolean modified = registeredConnections.add(conn);
@@ -39,7 +39,7 @@ public void sendToAll(String s) {
         registeredConnections.forEach(conn -> conn.send(s));
     }
 
-    public void sendToAll(WebSocketMessage message) {
+    public void sendToAll(WebSocketMessage<?> message) {
         try {
             String json = mapper.writeValueAsString(message);
             this.sendToAll(json);