spring TomcatEmbeddedContext 源码
springboot TomcatEmbeddedContext 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatEmbeddedContext.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.tomcat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.stream.Stream;
import jakarta.servlet.ServletException;
import org.apache.catalina.Container;
import org.apache.catalina.Manager;
import org.apache.catalina.Wrapper;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.core.StandardWrapper;
import org.apache.catalina.session.ManagerBase;
import org.springframework.boot.web.server.WebServerException;
import org.springframework.util.ClassUtils;
/**
* Tomcat {@link StandardContext} used by {@link TomcatWebServer} to support deferred
* initialization.
*
* @author Phillip Webb
* @author Andy Wilkinson
*/
class TomcatEmbeddedContext extends StandardContext {
private TomcatStarter starter;
@Override
public boolean loadOnStartup(Container[] children) {
// deferred until later (see deferredLoadOnStartup)
return true;
}
@Override
public void setManager(Manager manager) {
if (manager instanceof ManagerBase) {
manager.setSessionIdGenerator(new LazySessionIdGenerator());
}
super.setManager(manager);
}
void deferredLoadOnStartup() {
doWithThreadContextClassLoader(getLoader().getClassLoader(),
() -> getLoadOnStartupWrappers(findChildren()).forEach(this::load));
}
private Stream<Wrapper> getLoadOnStartupWrappers(Container[] children) {
Map<Integer, List<Wrapper>> grouped = new TreeMap<>();
for (Container child : children) {
Wrapper wrapper = (Wrapper) child;
int order = wrapper.getLoadOnStartup();
if (order >= 0) {
grouped.computeIfAbsent(order, (o) -> new ArrayList<>()).add(wrapper);
}
}
return grouped.values().stream().flatMap(List::stream);
}
private void load(Wrapper wrapper) {
try {
wrapper.load();
}
catch (ServletException ex) {
String message = sm.getString("standardContext.loadOnStartup.loadException", getName(), wrapper.getName());
if (getComputedFailCtxIfServletStartFails()) {
throw new WebServerException(message, ex);
}
getLogger().error(message, StandardWrapper.getRootCause(ex));
}
}
/**
* Some older Servlet frameworks (e.g. Struts, BIRT) use the Thread context class
* loader to create servlet instances in this phase. If they do that and then try to
* initialize them later the class loader may have changed, so wrap the call to
* loadOnStartup in what we think is going to be the main webapp classloader at
* runtime.
* @param classLoader the class loader to use
* @param code the code to run
*/
private void doWithThreadContextClassLoader(ClassLoader classLoader, Runnable code) {
ClassLoader existingLoader = (classLoader != null) ? ClassUtils.overrideThreadContextClassLoader(classLoader)
: null;
try {
code.run();
}
finally {
if (existingLoader != null) {
ClassUtils.overrideThreadContextClassLoader(existingLoader);
}
}
}
void setStarter(TomcatStarter starter) {
this.starter = starter;
}
TomcatStarter getStarter() {
return this.starter;
}
}
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