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/*
* Copyright 2002-2016 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
*
* https://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.http;
import java.util.function.Supplier;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
/**
* A "reactive" HTTP output message that accepts output as a {@link Publisher}.
*
* Typically implemented by an HTTP request on the client-side or an
* HTTP response on the server-side.
*
* @author Arjen Poutsma
* @author Sebastien Deleuze
* @since 5.0
*/
public interface ReactiveHttpOutputMessage extends HttpMessage {
/**
* Return a {@link DataBufferFactory} that can be used to create the body.
* @return a buffer factory
* @see #writeWith(Publisher)
*/
DataBufferFactory bufferFactory();
/**
* Register an action to apply just before the HttpOutputMessage is committed.
*
Note: the supplied action must be properly deferred,
* e.g. via {@link Mono#defer} or {@link Mono#fromRunnable}, to ensure it's
* executed in the right order, relative to other actions.
* @param action the action to apply
*/
void beforeCommit(Supplier> action);
/**
* Whether the HttpOutputMessage is committed.
*/
boolean isCommitted();
/**
* Use the given {@link Publisher} to write the body of the message to the
* underlying HTTP layer.
* @param body the body content publisher
* @return a {@link Mono} that indicates completion or error
*/
Mono writeWith(Publisher body);
/**
* Use the given {@link Publisher} of {@code Publishers} to write the body
* of the HttpOutputMessage to the underlying HTTP layer, flushing after
* each {@code Publisher}.
* @param body the body content publisher
* @return a {@link Mono} that indicates completion or error
*/
Mono writeAndFlushWith(Publisher> body);
/**
* Indicate that message handling is complete, allowing for any cleanup or
* end-of-processing tasks to be performed such as applying header changes
* made via {@link #getHeaders()} to the underlying HTTP message (if not
* applied already).
* This method should be automatically invoked at the end of message
* processing so typically applications should not have to invoke it.
* If invoked multiple times it should have no side effects.
* @return a {@link Mono} that indicates completion or error
*/
Mono setComplete();
}