spring LazyInitializationExcludeFilter 源码
springboot LazyInitializationExcludeFilter 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/LazyInitializationExcludeFilter.java
/*
* Copyright 2012-2020 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;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
/**
* Filter that can be used to exclude beans definitions from having their
* {@link AbstractBeanDefinition#setLazyInit(boolean) lazy-init} set by the
* {@link LazyInitializationBeanFactoryPostProcessor}.
* <p>
* Primarily intended to allow downstream projects to deal with edge-cases in which it is
* not easy to support lazy-loading (such as in DSLs that dynamically create additional
* beans). Adding an instance of this filter to the application context can be used for
* these edge cases.
* <p>
* A typical example would be something like this: <pre>
* @Bean
* public static LazyInitializationExcludeFilter integrationLazyInitializationExcludeFilter() {
* return LazyInitializationExcludeFilter.forBeanTypes(IntegrationFlow.class);
* }
* </pre>
* <p>
* NOTE: Beans of this type will be instantiated very early in the spring application
* lifecycle so they should generally be declared static and not have any dependencies.
*
* @author Tyler Van Gorder
* @author Philip Webb
* @since 2.2.0
*/
@FunctionalInterface
public interface LazyInitializationExcludeFilter {
/**
* Returns {@code true} if the specified bean definition should be excluded from
* having {@code lazy-init} automatically set.
* @param beanName the bean name
* @param beanDefinition the bean definition
* @param beanType the bean type
* @return {@code true} if {@code lazy-init} should not be automatically set
*/
boolean isExcluded(String beanName, BeanDefinition beanDefinition, Class<?> beanType);
/**
* Factory method that creates a filter for the given bean types.
* @param types the filtered types
* @return a new filter instance
*/
static LazyInitializationExcludeFilter forBeanTypes(Class<?>... types) {
return (beanName, beanDefinition, beanType) -> {
for (Class<?> type : types) {
if (type.isAssignableFrom(beanType)) {
return true;
}
}
return false;
};
}
}
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