spring GlassFishRequestUpgradeStrategy 源码
spring GlassFishRequestUpgradeStrategy 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/server/standard/GlassFishRequestUpgradeStrategy.java
/*
* Copyright 2002-2018 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.server.standard;
import java.io.IOException;
import java.lang.reflect.Constructor;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.glassfish.tyrus.core.TyrusUpgradeResponse;
import org.glassfish.tyrus.core.Utils;
import org.glassfish.tyrus.servlet.TyrusHttpUpgradeHandler;
import org.glassfish.tyrus.spi.WebSocketEngine.UpgradeInfo;
import org.glassfish.tyrus.spi.Writer;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.socket.server.HandshakeFailureException;
/**
* A WebSocket {@code RequestUpgradeStrategy} for Oracle's GlassFish 4.1 and higher.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @author Michael Irwin
* @since 4.0
*/
public class GlassFishRequestUpgradeStrategy extends AbstractTyrusRequestUpgradeStrategy {
private static final Constructor<?> constructor;
static {
try {
ClassLoader classLoader = GlassFishRequestUpgradeStrategy.class.getClassLoader();
Class<?> type = classLoader.loadClass("org.glassfish.tyrus.servlet.TyrusServletWriter");
constructor = type.getDeclaredConstructor(TyrusHttpUpgradeHandler.class);
ReflectionUtils.makeAccessible(constructor);
}
catch (Exception ex) {
throw new IllegalStateException("No compatible Tyrus version found", ex);
}
}
@Override
protected void handleSuccess(HttpServletRequest request, HttpServletResponse response,
UpgradeInfo upgradeInfo, TyrusUpgradeResponse upgradeResponse) throws IOException, ServletException {
TyrusHttpUpgradeHandler handler = request.upgrade(TyrusHttpUpgradeHandler.class);
Writer servletWriter = newServletWriter(handler);
handler.preInit(upgradeInfo, servletWriter, request.getUserPrincipal() != null);
response.setStatus(upgradeResponse.getStatus());
upgradeResponse.getHeaders().forEach((key, value) -> response.addHeader(key, Utils.getHeaderFromList(value)));
response.flushBuffer();
}
private Writer newServletWriter(TyrusHttpUpgradeHandler handler) {
try {
return (Writer) constructor.newInstance(handler);
}
catch (Exception ex) {
throw new HandshakeFailureException("Failed to instantiate TyrusServletWriter", ex);
}
}
}
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