ItemId.java

package com.ev3.item;

import java.nio.ByteBuffer;
import java.util.Base64;
import java.util.UUID;

public class ItemId {
    private static final int UUID_BYTE_LENGTH = 16;

    public static String generate() {
        UUID uuid = UUID.randomUUID();

        ByteBuffer uuidByteBuffer = ByteBuffer.wrap(new byte[UUID_BYTE_LENGTH]);
        uuidByteBuffer.putLong(uuid.getMostSignificantBits());
        uuidByteBuffer.putLong(uuid.getLeastSignificantBits());

        return Base64.getUrlEncoder().encodeToString(uuidByteBuffer.array());
    }
}