write Main & edit book.proto

src/main/java/org/example/Main.java

 package org.example;
 
-//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
-// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+import com.google.protobuf.InvalidProtocolBufferException;
+import org.ds.proto.Author;
+import org.ds.proto.Book;
+import org.ds.proto.BookType;
+import org.ds.proto.Library;
+
 public class Main {
-    public static void main(String[] args) {
-        //TIP Press <shortcut actionId="ShowIntentionActions"/> with your caret at the highlighted text
-        // to see how IntelliJ IDEA suggests fixing it.
-        System.out.printf("Hello and welcome!");
-
-        for (int i = 1; i <= 5; i++) {
-            //TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
-            // for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
-            System.out.println("i = " + i);
+    public static void main(String[] args) throws InvalidProtocolBufferException {
+        byte[] msg = sender();
+        receiver(msg);
+    }
+
+    private static void receiver(byte[] msg) throws InvalidProtocolBufferException {
+        System.out.println("Received Data:");
+        // Display binary data
+        for (int i = 0; i < msg.length; i++) {
+            System.out.print(msg[i] + " ");
+        }
+        System.out.println();
+        System.out.println("Total bytes: " + msg.length);
+
+        // Deserialize
+        var library = Library.parseFrom(msg);
+        System.out.println("Library contents:");
+        System.out.println(library.getBooksList());
+
+        // Display detailed book information
+        System.out.println("\nDetailed Book Information:");
+        for (Book book : library.getBooksList()) {
+            System.out.println("Title: " + book.getTitle());
+            System.out.println("Author: " + book.getAuthor().getName() + " from " + book.getAuthor().getCountry());
+            System.out.println("ISBN: " + book.getIsbn());
+            System.out.println("Year: " + book.getYear());
+            System.out.println("Type: " + book.getType());
+            System.out.println("Categories: " + book.getCategoriesList());
+            System.out.println("Available: " + book.getAvailable());
+            System.out.println("---");
+        }
+    }
+
+    private static byte[] sender() {
+        // Create first book
+        Book book1 = Book.newBuilder()
+                .setTitle("Protocol Buffers in Distributed Systems")
+                .setAuthor(Author.newBuilder()
+                        .setName("Ahmed Networks")
+                        .setCountry("Egypt")
+                        .build())
+                .setIsbn("978-1234567890")
+                .setYear(2024)
+                .setType(BookType.TECHNICAL)
+                .addCategories("Networks")
+                .addCategories("Programming")
+                .setAvailable(true)
+                .build();
+
+        // Create second book
+        Book book2 = Book.newBuilder()
+                .setTitle("gRPC Fundamentals and Communications")
+                .setAuthor(Author.newBuilder()
+                        .setName("Mohamed Developer")
+                        .setCountry("Saudi Arabia")
+                        .build())
+                .setIsbn("978-0987654321")
+                .setYear(2023)
+                .setType(BookType.SCIENCE)
+                .addCategories("Communications")
+                .addCategories("API")
+                .setAvailable(true)
+                .build();
+
+        // Create library and add books
+        Library library = Library.newBuilder()
+                .addBooks(book1)
+                .addBooks(book2)
+                .build();
+
+        // Serialize to byte array
+        byte[] arrayToSend = library.toByteArray();
+
+        // Display sent data
+        System.out.println(" Sent Data:");
+        for (int i = 0; i < arrayToSend.length; i++) {
+            System.out.print(arrayToSend[i] + " ");
         }
+        System.out.println();
+        System.out.println(" Total bytes to send: " + arrayToSend.length);
+
+        return arrayToSend;
     }
 }
\ No newline at end of file

src/main/proto/book.proto

 syntax = "proto3";
+
 option java_multiple_files = true;
 option java_package = "org.ds.proto";
 
-// enum جديد
+// Enum for book types
 enum BookType {
   UNKNOWN = 0;
   FICTION = 1;
   SCIENCE = 2;
   TECHNICAL = 3;
+  HISTORY = 4;
 }
 
-// رسالة متداخلة (Nested Message)
+// Nested message for author
 message Author {
   string name = 1;
   string country = 2;
 }
 
-// الرسالة الرئيسية
+// Main book message
 message Book {
   string title = 1;
   Author author = 2;                    // nested message
@@ -27,7 +29,50 @@ message Book {
   bool available = 7;
 }
 
-// مجموعة كتب
+// Book collection
 message Library {
   repeated Book books = 1;
+}
+
+// Service definition for library management
+service LibraryService {
+  // Simple RPC - Add a book
+  rpc AddBook (AddBookRequest) returns (AddBookResponse);
+
+  // Simple RPC - Get a book by ISBN
+  rpc GetBook (GetBookRequest) returns (Book);
+
+  // Server streaming RPC - Get all books
+  rpc GetAllBooks (GetAllBooksRequest) returns (stream Book);
+
+  // Client streaming RPC - Add multiple books
+  rpc AddMultipleBooks (stream Book) returns (AddBookResponse);
+
+  // Bidirectional streaming RPC - Process books
+  rpc ProcessBooks (stream Book) returns (stream BookProcessingResponse);
+}
+
+// Request and response messages for the service
+message AddBookRequest {
+  Book book = 1;
+}
+
+message AddBookResponse {
+  bool success = 1;
+  string message = 2;
+  string book_id = 3;
+}
+
+message GetBookRequest {
+  string isbn = 1;
+}
+
+message GetAllBooksRequest {
+  // Can add filters here if needed
+}
+
+message BookProcessingResponse {
+  string isbn = 1;
+  bool processed = 2;
+  string status = 3;
 }
\ No newline at end of file