enabled GraphiQL and created base entities

server/src/main/java/ru/dragonestia/picker/controller/graphql/GraphqlController.java

@@ -0,0 +1,27 @@
+package ru.dragonestia.picker.controller.graphql;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.graphql.data.method.annotation.QueryMapping;
+import org.springframework.stereotype.Controller;
+import ru.dragonestia.picker.controller.graphql.entity.EntityNode;
+import ru.dragonestia.picker.service.NodeService;
+import ru.dragonestia.picker.service.RoomService;
+import ru.dragonestia.picker.service.UserService;
+
+import java.util.List;
+
+@Controller
+@RequiredArgsConstructor
+public class GraphqlController {
+
+    private final NodeService nodeService;
+    private final RoomService roomService;
+    private final UserService userService;
+
+    @QueryMapping
+    List<EntityNode> allNodes() {
+        return nodeService.all().stream()
+                .map(EntityNode::new)
+                .toList();
+    }
+}

server/src/main/java/ru/dragonestia/picker/controller/graphql/entity/EntityNode.java

@@ -0,0 +1,21 @@
+package ru.dragonestia.picker.controller.graphql.entity;
+
+import jakarta.validation.constraints.NotNull;
+import ru.dragonestia.picker.model.Node;
+
+public class EntityNode {
+
+    private final Node node;
+
+    public EntityNode(Node node) {
+        this.node = node;
+    }
+
+    public @NotNull String getId() {
+        return node.getIdentifier();
+    }
+
+    public @NotNull String getMethod() {
+        return node.getPickingMethod().name();
+    }
+}

server/src/main/java/ru/dragonestia/picker/controller/graphql/entity/EntityRoom.java

@@ -0,0 +1,33 @@
+package ru.dragonestia.picker.controller.graphql.entity;
+
+import jakarta.validation.constraints.NotNull;
+import ru.dragonestia.picker.model.Room;
+
+public class EntityRoom {
+
+    private final Room room;
+
+    public EntityRoom(@NotNull Room room) {
+        this.room = room;
+    }
+
+    public @NotNull String getId() {
+        return room.getIdentifier();
+    }
+
+    public @NotNull String getNodeId() {
+        return room.getNodeIdentifier();
+    }
+
+    public int getSlots() {
+        return room.getMaxSlots();
+    }
+
+    public @NotNull String getPayload() {
+        return room.getPayload();
+    }
+
+    public boolean isLocked() {
+        return room.isLocked();
+    }
+}

server/src/main/java/ru/dragonestia/picker/controller/graphql/entity/EntityUser.java

@@ -0,0 +1,17 @@
+package ru.dragonestia.picker.controller.graphql.entity;
+
+import jakarta.validation.constraints.NotNull;
+import ru.dragonestia.picker.model.User;
+
+public class EntityUser {
+
+    private final User user;
+
+    public EntityUser(@NotNull User user) {
+        this.user = user;
+    }
+
+    public @NotNull String getId() {
+        return user.getIdentifier();
+    }
+}

server/src/main/resources/application.yml

@@ -15,3 +15,8 @@ springdoc:
   swagger-ui:
     path: /api-docs-ui
     default-models-expand-depth: -1
+
+spring:
+  graphql:
+    graphiql:
+      enabled: true

server/src/main/resources/graphql/schema.graphqls

@@ -0,0 +1,24 @@
+type Query {
+    allNodes: [Node]
+    nodeById(id: String!): Node
+    allRooms(nodeId: String!): [Room]
+    roomById(nodeId: String!, roomId: String!): Room
+    roomUsers(nodeId: String!, roomId: String!): [User]
+}
+
+type Node {
+    id: String!
+    method: String!
+}
+
+type Room {
+    id: String!
+    nodeId: String!
+    slots: Int!
+    payload: String!
+    locked: Boolean!
+}
+
+type User {
+    id: String!
+}