spring XhrClientSockJsSession 源码

spring XhrClientSockJsSession 代码

文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/XhrClientSockJsSession.java

/*
 * Copyright 2002-2022 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.socket.sockjs.client;

import java.net.InetSocketAddress;
import java.net.URI;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketExtension;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.sockjs.transport.TransportType;

/**
 * An extension of {@link AbstractClientSockJsSession} for use with HTTP
 * transports simulating a WebSocket session.
 *
 * @author Rossen Stoyanchev
 * @since 4.1
 */
public class XhrClientSockJsSession extends AbstractClientSockJsSession {

	private final XhrTransport transport;

	private final HttpHeaders headers;

	private final HttpHeaders sendHeaders;

	private final URI sendUrl;

	private int textMessageSizeLimit = -1;

	private int binaryMessageSizeLimit = -1;

	/**
	 * Create a new {@code XhrClientSockJsSession}.
	 * @deprecated as of 6.0, in favor of
	 * {@link #XhrClientSockJsSession(TransportRequest, WebSocketHandler, XhrTransport, CompletableFuture)}
	 */
	@Deprecated
	public XhrClientSockJsSession(
			TransportRequest request, WebSocketHandler handler, XhrTransport transport,
			org.springframework.util.concurrent.SettableListenableFuture<WebSocketSession> connectFuture) {

		super(request, handler, connectFuture);
		Assert.notNull(transport, "XhrTransport is required");
		this.transport = transport;
		this.headers = request.getHttpRequestHeaders();
		this.sendHeaders = new HttpHeaders();
		this.sendHeaders.putAll(this.headers);
		this.sendHeaders.setContentType(MediaType.APPLICATION_JSON);
		this.sendUrl = request.getSockJsUrlInfo().getTransportUrl(TransportType.XHR_SEND);
	}

	/**
	 * Create a new {@code XhrClientSockJsSession}.
	 * @since 6.0
	 */
	public XhrClientSockJsSession(TransportRequest request, WebSocketHandler handler,
			XhrTransport transport, CompletableFuture<WebSocketSession> connectFuture) {

		super(request, handler, connectFuture);
		Assert.notNull(transport, "XhrTransport is required");
		this.transport = transport;
		this.headers = request.getHttpRequestHeaders();
		this.sendHeaders = new HttpHeaders();
		this.sendHeaders.putAll(this.headers);
		this.sendHeaders.setContentType(MediaType.APPLICATION_JSON);
		this.sendUrl = request.getSockJsUrlInfo().getTransportUrl(TransportType.XHR_SEND);
	}


	public HttpHeaders getHeaders() {
		return this.headers;
	}

	@Override
	public InetSocketAddress getLocalAddress() {
		return null;
	}

	@Override
	public InetSocketAddress getRemoteAddress() {
		URI uri = getUri();
		return (uri != null ? new InetSocketAddress(uri.getHost(), uri.getPort()) : null);
	}

	@Override
	public String getAcceptedProtocol() {
		return null;
	}

	@Override
	public void setTextMessageSizeLimit(int messageSizeLimit) {
		this.textMessageSizeLimit = messageSizeLimit;
	}

	@Override
	public int getTextMessageSizeLimit() {
		return this.textMessageSizeLimit;
	}

	@Override
	public void setBinaryMessageSizeLimit(int messageSizeLimit) {
		this.binaryMessageSizeLimit = -1;
	}

	@Override
	public int getBinaryMessageSizeLimit() {
		return this.binaryMessageSizeLimit;
	}

	@Override
	public List<WebSocketExtension> getExtensions() {
		return Collections.emptyList();
	}

	@Override
	protected void sendInternal(TextMessage message) {
		this.transport.executeSendRequest(this.sendUrl, this.sendHeaders, message);
	}

	@Override
	protected void disconnect(CloseStatus status) {
		// Nothing to do: XHR transports check if session is disconnected.
	}

}

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