/*
* Copyright 2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.xd.reactor;
import org.reactivestreams.Publisher;
import reactor.rx.Stream;
/**
* Contract for performing stream processing using Reactor within an XD processor module
*
* @author Mark Pollack
* @author Stephane Maldini
*/
public interface Processor<I, O> {
/**
* Process a stream of messages and return an output stream. The input
* and output stream will be mapped onto receive/send operations on the message bus.
*
* @param inputStream Input stream the receives messages from the message bus
* @return Output Publisher (Stream, Promise, or any valid Reactive Stream Publisher) of messages sent to the message bus
*/
Publisher<O> process(Stream<I> inputStream);
}