spring ServletContextInitializerConfiguration 源码
springboot ServletContextInitializerConfiguration 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/jetty/ServletContextInitializerConfiguration.java
/*
* Copyright 2012-2022 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.boot.web.embedded.jetty;
import jakarta.servlet.ServletException;
import org.eclipse.jetty.webapp.AbstractConfiguration;
import org.eclipse.jetty.webapp.Configuration;
import org.eclipse.jetty.webapp.WebAppContext;
import org.springframework.boot.web.servlet.ServletContextInitializer;
import org.springframework.util.Assert;
/**
* Jetty {@link Configuration} that calls {@link ServletContextInitializer}s.
*
* @author Phillip Webb
* @author Andy Wilkinson
* @since 2.0.0
*/
public class ServletContextInitializerConfiguration extends AbstractConfiguration {
private final ServletContextInitializer[] initializers;
/**
* Create a new {@link ServletContextInitializerConfiguration}.
* @param initializers the initializers that should be invoked
* @since 1.2.1
*/
public ServletContextInitializerConfiguration(ServletContextInitializer... initializers) {
Assert.notNull(initializers, "Initializers must not be null");
this.initializers = initializers;
}
@Override
public void configure(WebAppContext context) throws Exception {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(context.getClassLoader());
try {
callInitializers(context);
}
finally {
Thread.currentThread().setContextClassLoader(classLoader);
}
}
private void callInitializers(WebAppContext context) throws ServletException {
try {
setExtendedListenerTypes(context, true);
for (ServletContextInitializer initializer : this.initializers) {
initializer.onStartup(context.getServletContext());
}
}
finally {
setExtendedListenerTypes(context, false);
}
}
private void setExtendedListenerTypes(WebAppContext context, boolean extended) {
try {
context.getServletContext().setExtendedListenerTypes(extended);
}
catch (NoSuchMethodError ex) {
// Not available on Jetty 8
}
}
}
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