spring AbstractListenerServerHttpResponse 源码
spring AbstractListenerServerHttpResponse 代码
文件路径：/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerServerHttpResponse.java
/*
* Copyright 2002-2021 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.server.reactive;
import java.util.concurrent.atomic.AtomicBoolean;
import org.reactivestreams.Processor;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpHeaders;
/**
* Abstract base class for listener-based server responses.
*
* @author Arjen Poutsma
* @since 5.0
*/
public abstract class AbstractListenerServerHttpResponse extends AbstractServerHttpResponse {
private final AtomicBoolean writeCalled = new AtomicBoolean();
public AbstractListenerServerHttpResponse(DataBufferFactory bufferFactory) {
super(bufferFactory);
}
public AbstractListenerServerHttpResponse(DataBufferFactory bufferFactory, HttpHeaders headers) {
super(bufferFactory, headers);
}
@Override
protected final Mono<Void> writeWithInternal(Publisher<? extends DataBuffer> body) {
return writeAndFlushWithInternal(Mono.just(body));
}
@Override
protected final Mono<Void> writeAndFlushWithInternal(
Publisher<? extends Publisher<? extends DataBuffer>> body) {
if (!this.writeCalled.compareAndSet(false, true)) {
return Mono.error(new IllegalStateException(
"writeWith() or writeAndFlushWith() has already been called"));
}
Processor<? super Publisher<? extends DataBuffer>, Void> processor = createBodyFlushProcessor();
return Mono.from(subscriber -> {
body.subscribe(processor);
processor.subscribe(subscriber);
});
}
/**
* Abstract template method to create a {@code Processor<Publisher<DataBuffer>, Void>}
* that will write the response body with flushes to the underlying output. Called from
* {@link #writeAndFlushWithInternal(Publisher)}.
*/
protected abstract Processor<? super Publisher<? extends DataBuffer>, Void> createBodyFlushProcessor();
}
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