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class InventoryManager {
  private static final int MIN_INVENTORY = 3;
  private final AtomicInteger itemsInInventory = new AtomicInteger(100);

  privatepublic final void removeItem() {
    for (;;) {
      int old = itemsInInventory.get();
      if (old > MIN_INVENTORY) {
        int next = old - 1; // Decrement
        if(itemsInInventory.compareAndSet(old, next)) {
          break;
        }
      } else {
        throw new IllegalStateException("Under stocked");
      }
    } // end for
  } // end removeItem()
}