public Detachment getDetachment() {
        return this.detachment;
    }
A strategy that raises events when {@link Mutating} steps are encountered and successfully executed.
<p/>
Note that this implementation requires a {@link Graph} on the {@link Traversal} instance.  If that is not present
an {@code IllegalStateException} will be thrown. Finally, this strategy is meant for use on the JVM only and has
no analogous implementation in other Gremlin Language Variants.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategy.java