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/*
* Copyright 2002-2023 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.beans;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import org.springframework.core.Ordered;
import org.springframework.core.SpringProperties;
import org.springframework.lang.NonNull;
/**
* {@link BeanInfoFactory} implementation that performs standard
* {@link java.beans.Introspector} inspection.
*
* To be configured via a {@code META-INF/spring.factories} file with the following content:
* {@code org.springframework.beans.BeanInfoFactory=org.springframework.beans.StandardBeanInfoFactory}
*
*
Ordered at {@link Ordered#LOWEST_PRECEDENCE} to allow other user-defined
* {@link BeanInfoFactory} types to take precedence.
*
* @author Juergen Hoeller
* @since 6.0
* @see ExtendedBeanInfoFactory
* @see CachedIntrospectionResults
* @see Introspector#getBeanInfo(Class)
*/
public class StandardBeanInfoFactory implements BeanInfoFactory, Ordered {
/**
* System property that instructs Spring to use the {@link Introspector#IGNORE_ALL_BEANINFO}
* mode when calling the JavaBeans {@link Introspector}: "spring.beaninfo.ignore", with a
* value of "true" skipping the search for {@code BeanInfo} classes (typically for scenarios
* where no such classes are being defined for beans in the application in the first place).
*
The default is "false", considering all {@code BeanInfo} metadata classes, like for
* standard {@link Introspector#getBeanInfo(Class)} calls. Consider switching this flag to
* "true" if you experience repeated ClassLoader access for non-existing {@code BeanInfo}
* classes, in case such access is expensive on startup or on lazy loading.
*
Note that such an effect may also indicate a scenario where caching doesn't work
* effectively: Prefer an arrangement where the Spring jars live in the same ClassLoader
* as the application classes, which allows for clean caching along with the application's
* lifecycle in any case. For a web application, consider declaring a local
* {@link org.springframework.web.util.IntrospectorCleanupListener} in {@code web.xml}
* in case of a multi-ClassLoader layout, which will allow for effective caching as well.
* @see Introspector#getBeanInfo(Class, int)
*/
public static final String IGNORE_BEANINFO_PROPERTY_NAME = "spring.beaninfo.ignore";
private static final boolean shouldIntrospectorIgnoreBeaninfoClasses =
SpringProperties.getFlag(IGNORE_BEANINFO_PROPERTY_NAME);
@Override
@NonNull
public BeanInfo getBeanInfo(Class beanClass) throws IntrospectionException {
BeanInfo beanInfo = (shouldIntrospectorIgnoreBeaninfoClasses ?
Introspector.getBeanInfo(beanClass, Introspector.IGNORE_ALL_BEANINFO) :
Introspector.getBeanInfo(beanClass));
// Immediately remove class from Introspector cache to allow for proper garbage
// collection on class loader shutdown; we cache it in CachedIntrospectionResults
// in a GC-friendly manner. This is necessary (again) for the JDK ClassInfo cache.
Class classToFlush = beanClass;
do {
Introspector.flushFromCaches(classToFlush);
classToFlush = classToFlush.getSuperclass();
}
while (classToFlush != null && classToFlush != Object.class);
return beanInfo;
}
@Override
public int getOrder() {
return Ordered.LOWEST_PRECEDENCE;
}
}