public DelegateProcessor(Publisher<OUT> downstream, Subscriber<IN> upstream) {
Assert.notNull(upstream, "Upstream must not be null");
Assert.notNull(downstream, "Downstream must not be null");
this.downstream = downstream;
this.upstream = upstream;
}
/**
* Creates a new {@code ConsumerFilteringEventRouter} that will use the {@code filter} to filter
* consumers.
*
* @param filter The filter to use. Must not be {@code null}.
* @throws IllegalArgumentException if {@code filter} or {@code consumerInvoker} is null.
*/
public ConsumerFilteringRouter(Filter filter) {
Assert.notNull(filter, "filter must not be null");
this.filter = filter;
}