src/main/java/org/nustaq/serialization/FSTObjectOutput.java
protected void objectHasBeenWritten( Object obj, int oldStreamPosition, int streamPosition ) {
        if (listener != null) {
            listener.objectHasBeenWritten(obj, oldStreamPosition, streamPosition);
        }
    }
protected void objectHasBeenWritten( Object obj, int oldStreamPosition, int streamPosition ) {
        if (listener != null) {
            listener.objectHasBeenWritten(obj, oldStreamPosition, streamPosition);
        }
    }
hook for debugging profiling. empty impl, you need to subclass to make use of this hook
@param obj
@param oldStreamPosition
@param streamPosition