Example analysis of striving for fault atomicity in java

Strive for failure atomicity

Item 8 is about failure. The general rule is that a failing method should not change the state of the object within the method. In order to fail early, one approach is to check the validity of the parameters before performing the operation. Below is a great example of following this tip.

/**
 * Assigns a new int value to location index of the buffer instance.
 * @param index int
 * @param newValue int
 */
public void modifyEntry(int index, int newValue) {
        if (index  size - 1) {
            throw new IndexOutOfBoundsException();
        }
 
//        ((int[]) bufferArrayList.get((int) (index / pageSize)))[index % pageSize] =
        ((int[]) bufferArrayList.get((index >> exp)))[index & r] =
            newValue;
}

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