spring ApplicationContextAotInitializer 源码
spring ApplicationContextAotInitializer 代码
文件路径：/spring-context/src/main/java/org/springframework/context/aot/ApplicationContextAotInitializer.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.context.aot;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* Initializes a {@link ConfigurableApplicationContext} using AOT optimizations.
*
* @author Stephane Nicoll
* @since 6.0
*/
public class ApplicationContextAotInitializer {
private static final Log logger = LogFactory.getLog(ApplicationContextAotInitializer.class);
/**
* Initialize the specified application context using the specified
* {@link ApplicationContextInitializer} class names. Each class is
* expected to have a default constructor.
* @param context the context to initialize
* @param initializerClassNames the application context initializer class names
*/
public void initialize(ConfigurableApplicationContext context, String... initializerClassNames) {
if (logger.isDebugEnabled()) {
logger.debug("Initializing ApplicationContext with AOT");
}
for (String initializerClassName : initializerClassNames) {
if (logger.isTraceEnabled()) {
logger.trace("Applying " + initializerClassName);
}
loadInitializer(initializerClassName, context.getClassLoader()).initialize(context);
}
}
@SuppressWarnings("unchecked")
private ApplicationContextInitializer<ConfigurableApplicationContext> loadInitializer(
String className, @Nullable ClassLoader classLoader) {
Object initializer = instantiate(className, classLoader);
if (!(initializer instanceof ApplicationContextInitializer)) {
throw new IllegalArgumentException("Not an ApplicationContextInitializer: " + className);
}
return (ApplicationContextInitializer<ConfigurableApplicationContext>) initializer;
}
private static Object instantiate(String className, @Nullable ClassLoader classLoader) {
try {
Class<?> type = ClassUtils.forName(className, classLoader);
return BeanUtils.instantiateClass(type);
}
catch (Exception ex) {
throw new IllegalArgumentException("Failed to instantiate ApplicationContextInitializer: " + className, ex);
}
}
}
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