SEI CERT Oracle Coding Standard for Java

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changes.mady.by.user Masaki Kubo

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changes.mady.by.user Yozo TODA

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Code Block
bgColor#ccccff
class InventoryManager {
  private final AtomicInteger itemsInInventory = new AtomicInteger(100);

  public final void nextItem() {
    while (true) {
      int old = itemsInInventory.get();
      if (old == Integer.MAX_VALUE) {
        throw new ArithmeticException("Integer overflow");
      }
      int next = old + 1; // Increment
      if (itemsInInventory.compareAndSet(old, next)) {
        break;
      }
    } // end while
  } // end removeItemnextItem()
}

Wiki Markup
The arguments to the {{compareAndSet()}} method are the expected value of the variable when the method is invoked and the intended new value. The variable's value is updated if, and only if, the current value and the expected value are equal (see \[[API 2006|AA. Bibliography#API 06]\] class [{{AtomicInteger}}|http://download.oracle.com/javase/6/docs/api/java/util/concurrent/atomic/AtomicInteger.html]). Refer to guideline [VNA02-J. Ensure that compound operations on shared variables are atomic|VNA02-J. Ensure that compound operations on shared variables are atomic] for more details.

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