protected void complete() {
        for (final Map.Entry<String, Object> entry : this.workerMemory.entrySet()) {
            this.mainMemory.add(entry.getKey(), entry.getValue());
        }
        this.workerMemory.clear();
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/process/computer/TinkerWorkerMemory.java