presto-main/src/main/java/io/prestosql/operator/WorkProcessorPipelineSourceOperator.java/InternalAggregatedMemoryContext/InternalAggregatedMemoryContext
class InternalAggregatedMemoryContext:        InternalAggregatedMemoryContext(AggregatedMemoryContext delegate, Runnable allocationListener)

        {
            this.delegate = requireNonNull(delegate, "delegate is null");
            this.allocationListener = requireNonNull(allocationListener, "allocationListener is null");
        }