  Description of hadronic reactions at high energies is conventionally done on
basis of QCD factoriza- tion so that factorization convolutions involve
non-perturbative inputs mimicking non-perturbative contributions and
perturbative evolution of those inputs. We construct the inputs for the gluon-
hadron scattering amplitudes in the forward kinematics and, using the Optical
theorem, convert them into inputs for gluon distributions in the both polarized
and unpolarized hadrons. Firstly, we derive general mathematical criteria which
any model for the inputs should obey and then suggest a Resonance Model
satisfying those criteria. This model is inspired by a simple observation:
after emitting an active parton off the hadron, the remaining ensemble of
spectators becomes unstable and therefore it can be described through factors
of the resonance type. Exploiting Resonance Model, we obtain non-perturbative
inputs for gluon distributions in unpolarized and polarized hadrons for all
available forms of QCD factorization: Basic, KT - and Collinear Factorizations.
We compare the obtained inputs to the inputs available in the literature.
