public default void incrIteration() {
            this.setIteration(this.getIteration() + 1);
        }
The Admin interface is used by the {@link GraphComputer} to update the Memory.
The developer should never need to type-cast the provided Memory to Memory.Admin.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/Memory.java