spring WebSocketHandlerAdapter 源码
spring WebSocketHandlerAdapter 代码
文件路径:/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/WebSocketHandlerAdapter.java
/*
* Copyright 2002-2020 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.web.reactive.socket.server.support;
import reactor.core.publisher.Mono;
import org.springframework.core.Ordered;
import org.springframework.util.Assert;
import org.springframework.web.reactive.HandlerAdapter;
import org.springframework.web.reactive.HandlerResult;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.server.WebSocketService;
import org.springframework.web.server.ServerWebExchange;
/**
* {@code HandlerAdapter} that allows
* {@link org.springframework.web.reactive.DispatcherHandler} to support
* handlers of type {@link WebSocketHandler} with such handlers mapped to
* URL patterns via
* {@link org.springframework.web.reactive.handler.SimpleUrlHandlerMapping}.
*
* <p>Requests are handled by delegating to a
* {@link WebSocketService}, by default {@link HandshakeWebSocketService},
* which checks the WebSocket handshake request parameters, upgrades to a
* WebSocket interaction, and uses the {@link WebSocketHandler} to handle it.
*
* <p>As of 5.3 the WebFlux Java configuration, imported via
* {@code @EnableWebFlux}, includes a declaration of this adapter and therefore
* it no longer needs to be present in application configuration.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class WebSocketHandlerAdapter implements HandlerAdapter, Ordered {
private final WebSocketService webSocketService;
private int order = 2;
/**
* Default constructor that creates and uses a
* {@link HandshakeWebSocketService}.
*/
public WebSocketHandlerAdapter() {
this(new HandshakeWebSocketService());
}
/**
* Alternative constructor with the {@link WebSocketService} to use.
*/
public WebSocketHandlerAdapter(WebSocketService webSocketService) {
Assert.notNull(webSocketService, "'webSocketService' is required");
this.webSocketService = webSocketService;
}
/**
* Set the order value for this adapter.
* <p>By default this is set to 2.
* @param order the value to set to
* @since 5.3
*/
public void setOrder(int order) {
this.order = order;
}
/**
* Return the {@link #setOrder(int) configured} order for this instance.
* @since 5.3
*/
@Override
public int getOrder() {
return this.order;
}
/**
* Return the configured {@code WebSocketService} to handle requests.
*/
public WebSocketService getWebSocketService() {
return this.webSocketService;
}
@Override
public boolean supports(Object handler) {
return WebSocketHandler.class.isAssignableFrom(handler.getClass());
}
@Override
public Mono<HandlerResult> handle(ServerWebExchange exchange, Object handler) {
WebSocketHandler webSocketHandler = (WebSocketHandler) handler;
return getWebSocketService().handleRequest(exchange, webSocketHandler).then(Mono.empty());
}
}
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