def deallocate(self):
        """Releases all resources."""
        if self._domain is not None:
            domain_delete(self._domain, self.logger)
        if self._network is not None:
            self._network_delete()
        if self._storage_pool is not None:
            self._storage_pool_delete()
        if self._hypervisor is not None:
            self._hypervisor_delete()