Created class to periodically extract some word from the dictionary. …

…Thread-safe implementation on the current extracted word.

src/main/java/server/service/WordExtractionService.java

@@ -0,0 +1,65 @@
+package server.service;
+
+import java.io.RandomAccessFile;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * Word extraction service.
+ * Periodically extract a new word from the dictionary.
+ */
+public class WordExtractionService extends Thread {
+
+    public static volatile String currentWord;
+    private static final List<String> dictionary;
+    private static final List<String> extractedWords;
+
+    static {
+        extractedWords = new ArrayList<>();
+        dictionary = new ArrayList<>();
+        try (final RandomAccessFile file =
+                     new RandomAccessFile("src/main/java/server/conf/words.txt", "r")) {
+            String line = file.readLine();
+            while (line != null) {
+                dictionary.add(line);
+                line = file.readLine();
+            }
+        } catch (Exception e) {
+            System.out.println("Error reading words from file.");
+        }
+    }
+
+
+    /**
+     * Constructor for WordExtractionService.
+     */
+    public WordExtractionService() {
+    }
+
+
+    /**
+     * Runs the service.
+     */
+    @Override
+    public void run() {
+        this.extractWord();
+    }
+
+
+    /**
+     * Randomly extracts a new word from the dictionary.
+     */
+    private void extractWord() {
+
+        final Random random = new Random();
+        final List<String> notExtractedWords =
+                dictionary.stream().filter(word -> !extractedWords.contains(word)).toList();
+        final String word = dictionary.get(random.nextInt(notExtractedWords.size()));
+        extractedWords.add(word);
+        currentWord = word;
+
+    }
+
+
+}