Implemented node service

LoadBalancerWeb/src/main/java/ru/dragonestia/loadbalancer/web/LoadBalancerWebApplication.java

@@ -0,0 +1,12 @@
+package ru.dragonestia.loadbalancer.web;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class LoadBalancerWebApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(LoadBalancerWebApplication.class, args);
+    }
+}

LoadBalancerWeb/src/main/java/ru/dragonestia/loadbalancer/web/page/HomePage.java

@@ -0,0 +1,17 @@
+package ru.dragonestia.loadbalancer.web.page;
+
+import com.vaadin.flow.component.html.H1;
+import com.vaadin.flow.component.html.Paragraph;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.router.Route;
+
+@Route("/")
+public class HomePage extends VerticalLayout {
+
+    public HomePage() {
+        super();
+
+        add(new H1("Hello world!"));
+        add(new Paragraph("Hello world!"));
+    }
+}

LoadBalancerWeb/src/main/resources/application.properties

@@ -0,0 +1 @@
+server.port=8090

LoadBalancerWeb/src/test/java/ru/dragonestia/loadbalancer/web/LoadBalancerWebApplicationTests.java

@@ -0,0 +1,13 @@
+package ru.dragonestia.loadbalancer.web;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class LoadBalancerWebApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}

src/main/java/ru/dragonestia/loadbalancer/service/NodeService.java

@@ -3,6 +3,7 @@ package ru.dragonestia.loadbalancer.service;
 import ru.dragonestia.loadbalancer.model.Node;
 
 import java.util.List;
+import java.util.Optional;
 
 public interface NodeService {
 
@@ -11,4 +12,6 @@ public interface NodeService {
     void removeNode(Node node);
 
     List<Node> allNodes();
+
+    Optional<Node> findNode(String identifier);
 }

src/main/java/ru/dragonestia/loadbalancer/service/impl/NodeServiceImpl.java

@@ -0,0 +1,41 @@
+package ru.dragonestia.loadbalancer.service.impl;
+
+import org.springframework.stereotype.Service;
+import ru.dragonestia.loadbalancer.model.Node;
+import ru.dragonestia.loadbalancer.service.NodeService;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+
+@Service
+public class NodeServiceImpl implements NodeService {
+
+    private final Map<String, Node> nodes = new ConcurrentHashMap<>();
+
+    @Override
+    public void createNode(Node node) {
+        if (nodes.containsKey(node.identifier())) {
+            throw new IllegalArgumentException("Node with id '" + node.identifier() + "' already exists");
+        }
+
+        nodes.put(node.identifier(), node);
+    }
+
+    @Override
+    public void removeNode(Node node) {
+        nodes.remove(node.identifier());
+    }
+
+    @Override
+    public List<Node> allNodes() {
+        return nodes.values().stream().toList();
+    }
+
+    @Override
+    public Optional<Node> findNode(String identifier) {
+        return nodes.containsKey(identifier)? Optional.of(nodes.get(identifier)) : Optional.empty();
+    }
+}