Bukkit

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public MachineName(int id) {
    super(id);
    
    //Each machine needs a block that represents it (The block that gets placed when the machine is created)
    this.setBlockRepresentation(Material.DISPENSER);

    //Each item needs an item the represents it (The item in your inventory that when placed, yields your machine)
    this.setItemRepresentation(new MachineItem(Material.DISPENSER, /* This is your items Material */
        "Block Breaker", /*This is your item name */
        "Will break those scrubby blocks for you")); /* This is your item's lore or description */
    
    //This is your machines crafting recipe
    ShapedRecipe recipe = new ShapedRecipe(this.getItemRepresentation().getItem());
    recipe.shape("CIC", "CPC", "CRC");
    recipe.setIngredient('C', Material.COBBLESTONE);
    recipe.setIngredient('I', Material.IRON_PICKAXE);
    recipe.setIngredient('P', Material.PISTON_BASE);
    recipe.setIngredient('R', Material.REDSTONE);

    //This is also where you will set the default values for your persistent data
    
    //Set your machines crafting recipe
    this.setRecipe(recipe);
}

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@Override
public void onTick() {
    //Called every 5 ticks
}

@Override
public void onPlace() {
    //Called when the machine is placed down
}

@Override
public void onRemove() {
    //Called when the machine is removed
}

@Override
public void onPowered() {
    //Called when the machine is powered by redstone (Not 100% accurate)
}

@Override
public void onInteract(PlayerInteractEvent event) {
    //Called when a player interacts with the machine
}

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//If you wanted to add an inventory to your machine, you could add an inventory object as a persistent data
//Persistent data can be added anywhere, but should more often than not be placed in the constructor
public MachineName(int id) {
    super(id);
    
    //Creates an inventory of 9 spaces with the name "Inventory Name" and binds it to the key "inventory"
    this.setPersistentData("inventory", Bukkit.getServer().createInventory(null, 9, "Inventory Name"));
    
    //To get the inventory back, you can do this
    Inventory inventory = (Inventory) this.getPersistentData("inventory");
    //You must cast to inventory as getPersistentData returns an Object
}

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MachineHub.registerMachine(new MachineName(0));
//0 being the id of the machine. Remember, these must be completely unique, even plugin to plugin