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BitTorrent Client Library (Core)

There is a newer version: 1.10

package bt.tracker.udp;

import bt.protocol.Protocols;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

abstract class UdpTrackerMessage {

    private int messageType;
    private int id;

    public UdpTrackerMessage(int messageType) {
        this.messageType = messageType;
        this.id = new Random(System.currentTimeMillis()).nextInt();
    }

    public int getId() {
        return id;
    }

    public int getMessageType() {
        return messageType;
    }

    public void writeTo(OutputStream out) throws IOException {
        out.write(Protocols.getIntBytes(messageType));
        out.write(Protocols.getIntBytes(id));
        writeBodyTo(out);
    }

    protected abstract void writeBodyTo(OutputStream out) throws IOException;

    @Override
    public String toString() {
        return getClass().getName() + "{" +
                "messageType=" + messageType +
                ", id=" + id +
                '}';
    }
}