http://www.reactive-streams.org/: A Protocol for Asynchronous Non-Blocking Data Sequence 
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/************************************************************************
 * Licensed under Public Domain (CC0)                                    *
 *                                                                       *
 * To the extent possible under law, the person who associated CC0 with  *
 * this code has waived all copyright and related or neighboring         *
 * rights to this code.                                                  *
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 * You should have received a copy of the CC0 legalcode along with this  *
 * work. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.*
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package org.reactivestreams;


A Processor represents a processing stage—which is both a Subscriber and a Publisher and obeys the contracts of both. 
Type parameters:
  • <T> – the type of element signaled to the Subscriber
  • <R> – the type of element signaled by the Publisher
/**
 * A Processor represents a processing stage—which is both a {@link Subscriber}
 * and a {@link Publisher} and obeys the contracts of both.
 *
 * @param <T> the type of element signaled to the {@link Subscriber}
 * @param <R> the type of element signaled by the {@link Publisher}
 */
public interface Processor<T, R> extends Subscriber<T>, Publisher<R> {
}