org.springframework.context.aot.ApplicationContextAotGenerator Maven / Gradle / Ivy
/*
* 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 java.util.function.Supplier;
import org.springframework.aot.generate.GenerationContext;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.cglib.core.ReflectUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.javapoet.ClassName;
/**
* Process an {@link ApplicationContext} and its {@link BeanFactory} to generate
* code that represents the state of the bean factory, as well as the necessary
* hints that can be used at runtime in a constrained environment.
*
* @author Stephane Nicoll
* @author Phillip Webb
* @since 6.0
*/
public class ApplicationContextAotGenerator {
/**
* Process the specified {@link GenericApplicationContext} ahead-of-time using
* the specified {@link GenerationContext}.
* Return the {@link ClassName} of the {@link ApplicationContextInitializer}
* to use to restore an optimized state of the application context.
* @param applicationContext the non-refreshed application context to process
* @param generationContext the generation context to use
* @return the {@code ClassName} of the {@code ApplicationContextInitializer}
* entry point
*/
public ClassName processAheadOfTime(GenericApplicationContext applicationContext,
GenerationContext generationContext) {
return withCglibClassHandler(new CglibClassHandler(generationContext), () -> {
applicationContext.refreshForAotProcessing(generationContext.getRuntimeHints());
DefaultListableBeanFactory beanFactory = applicationContext.getDefaultListableBeanFactory();
ApplicationContextInitializationCodeGenerator codeGenerator =
new ApplicationContextInitializationCodeGenerator(generationContext);
new BeanFactoryInitializationAotContributions(beanFactory).applyTo(generationContext, codeGenerator);
return codeGenerator.getGeneratedClass().getName();
});
}
private T withCglibClassHandler(CglibClassHandler cglibClassHandler, Supplier task) {
try {
ReflectUtils.setLoadedClassHandler(cglibClassHandler::handleLoadedClass);
ReflectUtils.setGeneratedClassHandler(cglibClassHandler::handleGeneratedClass);
return task.get();
}
finally {
ReflectUtils.setLoadedClassHandler(null);
ReflectUtils.setGeneratedClassHandler(null);
}
}
}