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/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.config.internal.util;
import static org.mule.runtime.core.api.util.ClassUtils.withContextClassLoader;
import org.mule.runtime.config.internal.OptionalObjectsController;
import org.mule.runtime.config.internal.processor.DiscardedOptionalBeanPostProcessor;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.InstantiationStrategy;
import org.springframework.beans.factory.support.RootBeanDefinition;
/**
* A {@link InstantiationStrategy} which doesn't fail if a bean cannot be instantiated, as long as such bean has been marked as
* optional in a {@link OptionalObjectsController}. In such case, the object is marked as discarded with the controller and a
* placeholder object is returned.
*
* This object delegates actual instantiation into a {@code delegate} which it wraps
*
* @since 3.7.0
* @see DiscardedOptionalBeanPostProcessor
*/
public class LaxInstantiationStrategyWrapper implements InstantiationStrategy {
private final InstantiationStrategy delegate;
private final OptionalObjectsController optionalObjectsController;
public LaxInstantiationStrategyWrapper(InstantiationStrategy delegate, OptionalObjectsController optionalObjectsController) {
this.delegate = delegate;
this.optionalObjectsController = optionalObjectsController;
}
@Override
public Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner) throws BeansException {
// TODO MULE-10002 - review approach to load the internal classes of the extensions when using them in the parsers.
return withContextClassLoader(getClassLoader(bd), () -> {
try {
return delegate.instantiate(bd, beanName, owner);
} catch (BeansException e) {
return failIfNotOptional(e, beanName);
}
});
}
private ClassLoader getClassLoader(RootBeanDefinition bd) {
try {
return bd.getBeanClass().getClassLoader();
} catch (IllegalStateException e) {
return Thread.currentThread().getContextClassLoader();
}
}
@Override
public Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, Constructor ctor, Object... args)
throws BeansException {
return withContextClassLoader(getClassLoader(bd), () -> {
try {
return delegate.instantiate(bd, beanName, owner, ctor, args);
} catch (BeansException e) {
return failIfNotOptional(e, beanName);
}
});
}
@Override
public Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, Object factoryBean, Method factoryMethod,
Object... args)
throws BeansException {
return withContextClassLoader(getClassLoader(bd), () -> {
try {
return delegate.instantiate(bd, beanName, owner, factoryBean, factoryMethod, args);
} catch (BeansException e) {
return failIfNotOptional(e, beanName);
}
});
}
private Object failIfNotOptional(BeansException exception, String beanName) throws BeansException {
if (optionalObjectsController.isOptional(beanName)) {
optionalObjectsController.discardOptionalObject(beanName);
return optionalObjectsController.getDiscardedObjectPlaceholder();
} else {
throw exception;
}
}
}