What is Thunder?

Thunder is an open-source and easy to use Java Networking Framework for Java 1.8 and higher Thunder uses TCP for guranteed data transfer Thunder is thread safe and supports Compression of Packets.

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Content:

• Understanding the Basics
• ThunderServer
• ThunderClient
• Using a ThunderListener
• Creating and Sending Packets
• Handling Packets
• Response System

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Basics:

The ThunderServer and the ThunderClient are based on the ThunderConnection The ThunderConnection has its own unique Session to identify it. You can get it by using ThunderConnection#getSession()

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ThunderServer:

You can create a ThunderServer as the following. The Server is used to handle all Connections (ThunderClients).

ThunderServer thunderServer = Thunder.createServer();
thunderServer.start(1401).perform();

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ThunderClient:

The ThunderClient connects to the ThunderServer and transfers data from one connection to another.

ThunderClient thunderClient = Thunder.createClient();
thunderClient.connect("127.0.0.1", 1401).perform();

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ThunderListener:

The ThunderListener implements three methods to listen for events. The Listener can be add to a ThunderConnection (so either ThunderClient or ThunderServer)

thunderClient.addSessionListener(new ThunderListener() {
    @Override
    public void handleConnect(ThunderSession session) {
        System.out.println("[Client] Connected to ThunderServer (" + System.currentTimeMillis() + ")");
    }

    @Override
    public void handleHandshake(PacketHandshake handshake) {
        System.out.println("[Client] Received HandShake from ThunderServer! (" + System.currentTimeMillis() + ")");
     }

    @Override
    public void handlePacketSend(Packet packet) {
        System.out.println("[Client] Sending " + packet.getClass().getSimpleName() + "... (" + System.currentTimeMillis() + ")");
    }

    @Override
    public void handlePacketReceive(Packet packet) {
        System.out.println("[Client] Received " + packet.getClass().getSimpleName() + "! (" + System.currentTimeMillis() + ")");
     }

    @Override
    public void handleDisconnect(ThunderSession session) {
        System.out.println(thunderClient.toString());
    }
    
});

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Packets:

Packets are the objects that contain the data which is getting transferred between ThunderConnections. Packet.class is abstract and contains two default methods. Packet#write(PacketBuffer) and Packet#read(PacketBuffer).

Every Packet has its own UUID, a protocolVersion, a protocolId, and other values. An example Packet could look like the following:

@Getter @AllArgsConstructor
public class SamplePacket extends Packet {

    private String name;
    private int age;

    @Override
    public void write(PacketBuffer buf) {
        buf.writeString(name);
        buf.writeInt(age);
    }

    @Override
    public void read(PacketBuffer buf) {
        name = buf.readString();
        age = buf.readInt();
    }

}

The attributes inside of a Packet must be read and written from or into the PacketBuffer. A Packet can be send through a ThunderConnection.

SamplePacket samplePacket = new SamplePacket("Name", 32);
thunderConnection.sendPacket(samplePacket);

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PacketHandling:

When receiving Packets from a different ThunderConnection you can handle the received Packet with the integrated PacketAdapter and register a PacketHandler to handle the Packet.

thunderConnection.addPacketHandler(new PacketHandler() {
       @Override
       public void handle(ThunderPacket packet) {
           //Check if packet is SamplePacket
           if (packet instanceof SamplePacket) {
              SamplePacket samplePacket = (SamplePacket) packet;
              System.out.println(samplePacket.getAge());
              System.out.println(samplePacket.getName());
              System.out.println(samplePacket.getProcessingTime() + "ms"); //The time the packet took
              System.out.println(samplePacket.toString()); //Information on the Packet
          }
      }
  });

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Response System:

The PacketSystem takes advantage of a Response-based System. You can await for a Response when sending a Packet. You can respond to a Packet with a ResponseStatus and/or a Message.

An example could look like this:

(Waiting for the Response with Consumer)

thunderConnection.sendPacket(new SamplePacket("Luca", 16), new Consumer<Response>() {
      @Override
      public void accept(Response response) {
          System.out.println(response.getStatus() + " - " + response.getMessage() + " [" + response.getProcessingTime() + "ms]");
      }
  });

(Waiting for the Response without Consumer)

SamplePacket samplePacket = new SamplePacket("Name", 16);
Response response = thunderConnection.transferToResponse(samplePacket);
System.out.println(response.getStatus() + " - " + response.getMessage());

(Responding to the Packet)

thunderConnection.addPacketHandler(new PacketHandler() {
       @Override
       public void handle(ThunderPacket packet) {
           //Check if packet is SamplePacket
           if (packet instanceof SamplePacket) {
             packet.respond(ResponseStatus.SUCCESS, "Test Message");
          }
      }
  });