question: this method will always be called before releasing the operator reference . concode_field_sep ListenableFuture<?> NOT_BLOCKED concode_field_sep boolean needsInput concode_elem_sep void addInput concode_elem_sep ListenableFuture<?> isBlocked concode_elem_sep void finish concode_elem_sep List<Type> getTypes concode_elem_sep boolean isFinished concode_elem_sep OperatorContext getOperatorContext concode_elem_sep Page getOutput
target: void function ( ) { }