1. A method for filtering at least one resource candidate through a system that includes a first set of sequential filters and a second set of sequential filters different from the first set, a first filter in the first set of sequential filters including a reference to a second filter in the second set of sequential filters, the method comprising: first sequentially filtering a received resource candidate through at least a portion of the first set of sequential filters; in response to the first sequential filtering reaching the first filter of the first set of sequential filters: suspending the first sequential filtering; and second sequentially filtering, by the second set of sequential filters beginning with the second filter, an output of the first filter; first receiving, at a sequentially next filter to the first filter in the first set of sequential filters, a further filtered version of the output of the first filter, the further filtered version being at least partially filtered by at least a portion of the second set of sequential filters; resuming, in response to the first receiving, the first sequential filtering beginning with the sequential next filter to the first filter of the first set of sequential filters.