Добавлена подписка на стримы по ws

src/main/java/ru/serega6531/packmate/service/PacketsSubscriptionService.java

@@ -0,0 +1,53 @@
+package ru.serega6531.packmate.service;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import ru.serega6531.packmate.model.Stream;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+@Slf4j
+public class PacketsSubscriptionService {
+
+    private List<WebSocketSession> subscribers = new ArrayList<>();
+
+    private final ObjectMapper mapper;
+
+    @Autowired
+    public PacketsSubscriptionService(ObjectMapper mapper) {
+        this.mapper = mapper;
+    }
+
+    public void addSubscriber(WebSocketSession session) {
+        log.info("Подписан пользователь {}", session.getRemoteAddress().getHostName());
+        subscribers.add(session);
+    }
+
+    public void removeSubscriber(WebSocketSession session) {
+        log.info("Отписан пользователь {}", session.getRemoteAddress().getHostName());
+        subscribers.remove(session);
+    }
+
+    public void broadcastNewStream(Stream stream) {
+        subscribers.forEach(s -> {
+            try {
+                s.sendMessage(objectToTextMessage(stream));
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+    }
+
+    private TextMessage objectToTextMessage(Object object) throws JsonProcessingException {
+        return new TextMessage(mapper.writeValueAsString(object));
+    }
+
+}