Added HelloServer handler

src/main/java/ru/bclib/BCLib.java

@@ -7,7 +7,7 @@ import net.minecraft.resources.ResourceLocation;
 import ru.bclib.api.TagAPI;
 import ru.bclib.api.WorldDataAPI;
 import ru.bclib.api.dataexchange.DataExchangeAPI;
-import ru.bclib.api.dataexchange.TestHandler;
+import ru.bclib.api.dataexchange.handler.HelloServer;
 import ru.bclib.config.Configs;
 import ru.bclib.recipes.CraftingRecipes;
 import ru.bclib.registry.BaseBlockEntities;
@@ -28,7 +28,7 @@ public class BCLib implements ModInitializer {
 		CraftingRecipes.init();
 		WorldDataAPI.registerModCache(MOD_ID);
 		Configs.save();
-		DataExchangeAPI.registerDescriptor(TestHandler.DESCRIPTOR);
+		DataExchangeAPI.registerDescriptor(HelloServer.DESCRIPTOR);
 	}
 	
 	public static boolean isDevEnvironment() {

src/main/java/ru/bclib/api/dataexchange/DataExchangeAPI.java

@@ -4,6 +4,7 @@ import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents;
+import net.minecraft.network.FriendlyByteBuf;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -19,7 +20,7 @@ public class DataExchangeAPI {
 		descriptors = new HashSet<>();
 	}
 	
-	public static DataExchangeAPI getInstance(){
+	static DataExchangeAPI getInstance(){
 		if (instance==null){
 			instance = new DataExchangeAPI();
 		}
@@ -45,12 +46,21 @@ public class DataExchangeAPI {
 		ServerPlayConnectionEvents.DISCONNECT.register(server::onPlayDisconnect);
 	}
 	
+	/**
+	 * Add a new Descriptor for a DataHandler.
+	 * @param desc The Descriptor you want to add.
+	 */
 	public static void registerDescriptor(DataHandlerDescriptor desc){
 		DataExchangeAPI api = DataExchangeAPI.getInstance();
 		api.descriptors.add(desc);
 	}
 	
 	
+	/**
+	 * Initializes all datastructures that need to exist in the client component.
+	 * <p>
+	 * This is automatically called by BCLib. You can register {@link DataHandler}-Objects before this Method is called
+	 */
 	@Environment(EnvType.CLIENT)
 	public static void prepareClientside(){
 		DataExchangeAPI api = DataExchangeAPI.getInstance();
@@ -58,11 +68,27 @@ public class DataExchangeAPI {
 		
 	}
 	
+	/**
+	 * Initializes all datastructures that need to exist in the server component.
+	 * <p>
+	 * This is automatically called by BCLib. You can register {@link DataHandler}-Objects before this Method is called
+	 */
 	public static void prepareServerside(){
 		DataExchangeAPI api = DataExchangeAPI.getInstance();
 		api.initServerSide();
 	}
 	
+	
+	/**
+	 * Sends the Handler.
+	 * <p>
+	 * Depending on what the result of {@link DataHandler#getOriginatesOnServer()}, the Data is sent from the server
+	 * to the client (if {@code true}) or the other way around.
+	 * <p>
+	 * The method {@link DataHandler#serializeData(FriendlyByteBuf)} is called just before the data is sent. You should
+	 * use this method to add the Data you need to the communication.
+	 * @param h The Data that you want to send
+	 */
 	public static void send(DataHandler h){
 		if (h.getOriginatesOnServer()){
 			DataExchangeAPI.getInstance().server.sendToClient(h);

src/main/java/ru/bclib/api/dataexchange/TestHandler.java

@@ -1,40 +0,0 @@
-package ru.bclib.api.dataexchange;
-
-import net.fabricmc.api.EnvType;
-import net.fabricmc.api.Environment;
-import net.fabricmc.fabric.api.networking.v1.PacketSender;
-import net.minecraft.client.Minecraft;
-import net.minecraft.network.FriendlyByteBuf;
-import net.minecraft.resources.ResourceLocation;
-import ru.bclib.BCLib;
-
-import java.nio.charset.StandardCharsets;
-
-public class TestHandler extends DataHandler{
-	public static DataHandlerDescriptor DESCRIPTOR = new DataHandlerDescriptor(new ResourceLocation(BCLib.MOD_ID, "__test"), TestHandler::new, true);
-	
-	public TestHandler() {
-		super(DESCRIPTOR.IDENTIFIER, true);
-	}
-	
-	@Override
-	protected void deserializeFromIncomingData(FriendlyByteBuf buf, PacketSender responseSender, boolean fromClient) {
-		int length = buf.readInt();
-		CharSequence text = buf.readCharSequence(length, StandardCharsets.UTF_8);
-		BCLib.LOGGER.info("PROCESSING INCOMING TEST-DATA fromClient="+fromClient+": "+text);
-	}
-	
-	@Override
-	@Environment(EnvType.CLIENT)
-	protected void runOnClient(Minecraft client) {
-		BCLib.LOGGER.info("RUNNING INCOMING TEST-DATA ON CLIENT");
-	}
-	
-	@Override
-	protected void serializeData(FriendlyByteBuf buf) {
-		CharSequence text = "Welcome from BCLib";
-		buf.writeInt(text.length());
-		buf.writeCharSequence(text, StandardCharsets.UTF_8);
-		BCLib.LOGGER.info("BUILDING OUTGOING TEST-DATA ON SERVER");
-	}
-}

src/main/java/ru/bclib/api/dataexchange/handler/HelloServer.java

@@ -0,0 +1,56 @@
+package ru.bclib.api.dataexchange.handler;
+
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.fabricmc.fabric.api.networking.v1.PacketSender;
+import net.fabricmc.loader.api.FabricLoader;
+import net.fabricmc.loader.api.ModContainer;
+import net.minecraft.client.Minecraft;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.resources.ResourceLocation;
+import ru.bclib.BCLib;
+import ru.bclib.api.dataexchange.DataHandler;
+import ru.bclib.api.dataexchange.DataHandlerDescriptor;
+import ru.bclib.api.datafixer.DataFixerAPI;
+
+import java.util.Optional;
+
+public class HelloServer extends DataHandler {
+	public static DataHandlerDescriptor DESCRIPTOR = new DataHandlerDescriptor(new ResourceLocation(BCLib.MOD_ID, "hello_server"), HelloServer::new, true);
+	
+	public HelloServer() {
+		super(DESCRIPTOR.IDENTIFIER, false);
+	}
+	
+	public static String getModVersion(String modID){
+		Optional<ModContainer> optional = FabricLoader.getInstance().getModContainer(modID);
+		if (optional.isPresent()) {
+			ModContainer modContainer = optional.get();
+			return modContainer.getMetadata().getVersion().toString();
+		}
+		return "0.0.0";
+	}
+	
+	protected static String getBCLibVersion(){
+		return getModVersion(BCLib.MOD_ID);
+	}
+	
+	@Override
+	protected void deserializeFromIncomingData(FriendlyByteBuf buf, PacketSender responseSender, boolean fromClient) {
+		String bclibVersion = DataFixerAPI.getModVersion(buf.readInt());
+		String localBclibVersion = getBCLibVersion();
+		
+		BCLib.LOGGER.info("Hello Server received from BCLib. (server="+localBclibVersion+", client="+bclibVersion+")");
+	}
+	
+	@Override
+	@Environment(EnvType.CLIENT)
+	protected void runOnClient(Minecraft client) {
+	
+	}
+	
+	@Override
+	protected void serializeData(FriendlyByteBuf buf) {
+		buf.writeInt(DataFixerAPI.getModVersion(getBCLibVersion()));
+	}
+}