org.springframework.http.server.reactive.ServerHttpResponse#bufferFactory ( )源码实例Demo

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {

	ServerHttpResponse response = exchange.getResponse();
	HttpServerResponse reactorResponse = ((AbstractServerHttpResponse) response).getNativeResponse();
	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	NettyDataBufferFactory bufferFactory = (NettyDataBufferFactory) response.bufferFactory();

	return reactorResponse.sendWebsocket(subProtocol, this.maxFramePayloadLength,
			(in, out) -> {
				ReactorNettyWebSocketSession session =
						new ReactorNettyWebSocketSession(
								in, out, handshakeInfo, bufferFactory, this.maxFramePayloadLength);
				URI uri = exchange.getRequest().getURI();
				return handler.handle(session).checkpoint(uri + " [ReactorNettyRequestUpgradeStrategy]");
			});
}
 

@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
    ServerHttpResponse response = exchange.getResponse();
    DataBufferFactory bufferFactory = response.bufferFactory();
    ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(response) {
        @Override
        public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
            if (body instanceof Flux) {
                Flux<? extends DataBuffer> fluxBody = (Flux<? extends DataBuffer>) body;
                return super.writeWith(fluxBody.map(dataBuffer -> {
                    // probably should reuse buffers
                    byte[] content = new byte[dataBuffer.readableByteCount()];
                    dataBuffer.read(content);
                    //释放掉内存
                    DataBufferUtils.release(dataBuffer);
                    return bufferFactory.wrap(content);
                }));
            }
            // if body is not a flux. never got there.
            return super.writeWith(body);
        }
    };
    return chain.filter(exchange.mutate().response(decoratedResponse).build()).then(Mono.fromRunnable(()->{
        accessLogService.sendLog(exchange, null);
    }));
}
 

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {

	ServerHttpResponse response = exchange.getResponse();
	HttpServerResponse reactorResponse = ((AbstractServerHttpResponse) response).getNativeResponse();
	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	NettyDataBufferFactory bufferFactory = (NettyDataBufferFactory) response.bufferFactory();

	return reactorResponse.sendWebsocket(subProtocol, this.maxFramePayloadLength,
			(in, out) -> {
				ReactorNettyWebSocketSession session =
						new ReactorNettyWebSocketSession(
								in, out, handshakeInfo, bufferFactory, this.maxFramePayloadLength);
				return handler.handle(session);
			});
}
 

private Mono<DataBuffer> writeBody(ServerHttpResponse httpResponse,
		CachedBodyOutputMessage message, Class<?> outClass) {
	Mono<DataBuffer> response = DataBufferUtils.join(message.getBody());
	if (byte[].class.isAssignableFrom(outClass)) {
		return response;
	}

	List<String> encodingHeaders = httpResponse.getHeaders()
			.getOrEmpty(HttpHeaders.CONTENT_ENCODING);
	for (String encoding : encodingHeaders) {
		MessageBodyEncoder encoder = messageBodyEncoders.get(encoding);
		if (encoder != null) {
			DataBufferFactory dataBufferFactory = httpResponse.bufferFactory();
			response = response.publishOn(Schedulers.parallel())
					.map(encoder::encode).map(dataBufferFactory::wrap);
			break;
		}
	}

	return response;
}
 

@RequestMapping(path = "/gzip", produces = MediaType.APPLICATION_JSON_VALUE)
public Mono<Void> gzip(ServerWebExchange exchange) throws IOException {
	if (log.isDebugEnabled()) {
		log.debug("httpbin /gzip");
	}

	String jsonResponse = OBJECT_MAPPER.writeValueAsString("httpbin compatible home");
	byte[] bytes = jsonResponse.getBytes(StandardCharsets.UTF_8);

	ServerHttpResponse response = exchange.getResponse();
	response.getHeaders().add(HttpHeaders.CONTENT_ENCODING, "gzip");
	DataBufferFactory dataBufferFactory = response.bufferFactory();
	response.setStatusCode(HttpStatus.OK);

	ByteArrayOutputStream bos = new ByteArrayOutputStream();
	GZIPOutputStream is = new GZIPOutputStream(bos);
	FileCopyUtils.copy(bytes, is);

	byte[] gzippedResponse = bos.toByteArray();
	DataBuffer wrap = dataBufferFactory.wrap(gzippedResponse);
	return response.writeWith(Flux.just(wrap));
}
 

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {

	ServerHttpRequest request = exchange.getRequest();
	ServerHttpResponse response = exchange.getResponse();

	HttpServletRequest servletRequest = getHttpServletRequest(request);
	HttpServletResponse servletResponse = getHttpServletResponse(response);

	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	DataBufferFactory factory = response.bufferFactory();

	JettyWebSocketHandlerAdapter adapter = new JettyWebSocketHandlerAdapter(
			handler, session -> new JettyWebSocketSession(session, handshakeInfo, factory));

	startLazily(servletRequest);

	Assert.state(this.factory != null, "No WebSocketServerFactory available");
	boolean isUpgrade = this.factory.isUpgradeRequest(servletRequest, servletResponse);
	Assert.isTrue(isUpgrade, "Not a WebSocket handshake");

	try {
		adapterHolder.set(new WebSocketHandlerContainer(adapter, subProtocol));
		this.factory.acceptWebSocket(servletRequest, servletResponse);
	}
	catch (IOException ex) {
		return Mono.error(ex);
	}
	finally {
		adapterHolder.remove();
	}

	return Mono.empty();
}
 

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory){

	ServerHttpRequest request = exchange.getRequest();
	ServerHttpResponse response = exchange.getResponse();

	HttpServletRequest servletRequest = getHttpServletRequest(request);
	HttpServletResponse servletResponse = getHttpServletResponse(response);

	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	DataBufferFactory bufferFactory = response.bufferFactory();

	Endpoint endpoint = new StandardWebSocketHandlerAdapter(
			handler, session -> new TomcatWebSocketSession(session, handshakeInfo, bufferFactory));

	String requestURI = servletRequest.getRequestURI();
	DefaultServerEndpointConfig config = new DefaultServerEndpointConfig(requestURI, endpoint);
	config.setSubprotocols(subProtocol != null ?
			Collections.singletonList(subProtocol) : Collections.emptyList());

	try {
		WsServerContainer container = getContainer(servletRequest);
		container.doUpgrade(servletRequest, servletResponse, config, Collections.emptyMap());
	}
	catch (ServletException | IOException ex) {
		return Mono.error(ex);
	}

	return Mono.empty();
}
 

public static Mono<Void> responseWrite(ServerWebExchange exchange, int httpStatus, Result result) {
    if (httpStatus == 0) {
        httpStatus = HttpStatus.INTERNAL_SERVER_ERROR.value();
    }
    ServerHttpResponse response = exchange.getResponse();
    response.getHeaders().setAccessControlAllowCredentials(true);
    response.getHeaders().setAccessControlAllowOrigin("*");
    response.setStatusCode(HttpStatus.valueOf(httpStatus));
    response.getHeaders().setContentType(MediaType.APPLICATION_JSON_UTF8);
    DataBufferFactory dataBufferFactory = response.bufferFactory();
    DataBuffer buffer = dataBufferFactory.wrap(JSONObject.toJSONString(result).getBytes(Charset.defaultCharset()));
    return response.writeWith(Mono.just(buffer)).doOnError((error) -> {
        DataBufferUtils.release(buffer);
    });
}
 

public <T> Mono<Void> write(ServerHttpResponse httpResponse, T object) {
    DataBufferFactory bufferFactory = httpResponse.bufferFactory();
    return httpResponse
            .writeWith(Mono.fromSupplier(() -> {
                try {
                    return bufferFactory.wrap(objectMapper.writeValueAsBytes(object));
                } catch (Exception ex) {
                    log.warn("Error writing response", ex);
                    return bufferFactory.wrap(new byte[0]);
                }
            }));
}
 

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {

	ServerHttpRequest request = exchange.getRequest();
	ServerHttpResponse response = exchange.getResponse();

	HttpServletRequest servletRequest = getHttpServletRequest(request);
	HttpServletResponse servletResponse = getHttpServletResponse(response);

	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	DataBufferFactory factory = response.bufferFactory();

	JettyWebSocketHandlerAdapter adapter = new JettyWebSocketHandlerAdapter(
			handler, session -> new JettyWebSocketSession(session, handshakeInfo, factory));

	startLazily(servletRequest);

	Assert.state(this.factory != null, "No WebSocketServerFactory available");
	boolean isUpgrade = this.factory.isUpgradeRequest(servletRequest, servletResponse);
	Assert.isTrue(isUpgrade, "Not a WebSocket handshake");

	try {
		adapterHolder.set(new WebSocketHandlerContainer(adapter, subProtocol));
		this.factory.acceptWebSocket(servletRequest, servletResponse);
	}
	catch (IOException ex) {
		return Mono.error(ex);
	}
	finally {
		adapterHolder.remove();
	}

	return Mono.empty();
}
 

@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
		@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory){

	ServerHttpRequest request = exchange.getRequest();
	ServerHttpResponse response = exchange.getResponse();

	HttpServletRequest servletRequest = getHttpServletRequest(request);
	HttpServletResponse servletResponse = getHttpServletResponse(response);

	HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
	DataBufferFactory bufferFactory = response.bufferFactory();

	Endpoint endpoint = new StandardWebSocketHandlerAdapter(
			handler, session -> new TomcatWebSocketSession(session, handshakeInfo, bufferFactory));

	String requestURI = servletRequest.getRequestURI();
	DefaultServerEndpointConfig config = new DefaultServerEndpointConfig(requestURI, endpoint);
	config.setSubprotocols(subProtocol != null ?
			Collections.singletonList(subProtocol) : Collections.emptyList());

	try {
		WsServerContainer container = getContainer(servletRequest);
		container.doUpgrade(servletRequest, servletResponse, config, Collections.emptyMap());
	}
	catch (ServletException | IOException ex) {
		return Mono.error(ex);
	}

	return Mono.empty();
}
 

/**
 * Caches the request body in a ServerWebExchange attribute. The attribute is
 * {@link #CACHED_REQUEST_BODY_ATTR}. If this method is called from a location that
 * can not mutate the ServerWebExchange (such as a Predicate), setting
 * cacheDecoratedRequest to true will put a {@link ServerHttpRequestDecorator} in an
 * attribute {@link #CACHED_SERVER_HTTP_REQUEST_DECORATOR_ATTR} for adaptation later.
 * @param exchange the available ServerWebExchange.
 * @param cacheDecoratedRequest if true, the ServerHttpRequestDecorator will be
 * cached.
 * @param function a function that accepts a ServerHttpRequest. It can be the created
 * ServerHttpRequestDecorator or the originial if there is no body.
 * @param <T> generic type for the return {@link Mono}.
 * @return Mono of type T created by the function parameter.
 */
private static <T> Mono<T> cacheRequestBody(ServerWebExchange exchange,
		boolean cacheDecoratedRequest,
		Function<ServerHttpRequest, Mono<T>> function) {
	ServerHttpResponse response = exchange.getResponse();
	NettyDataBufferFactory factory = (NettyDataBufferFactory) response
			.bufferFactory();
	// Join all the DataBuffers so we have a single DataBuffer for the body
	return DataBufferUtils.join(exchange.getRequest().getBody())
			.defaultIfEmpty(
					factory.wrap(new EmptyByteBuf(factory.getByteBufAllocator())))
			.map(dataBuffer -> decorate(exchange, dataBuffer, cacheDecoratedRequest))
			.switchIfEmpty(Mono.just(exchange.getRequest())).flatMap(function);
}