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Comprehensive Java library for spring framework (Java8+)
/*
* Copyright (C) 2015-2018 S.Violet
*
* 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
*
* http://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.
*
* Project GitHub: https://github.com/shepherdviolet/slate
* Email: [email protected]
*/
package sviolet.slate.common.x.proxy.interfaceinst;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.Ordered;
import org.springframework.core.PriorityOrdered;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* [JDK8- Spring 5-]
*
* 核心逻辑, 适配低版本
*
* @author S.Violet
*/
class InterfaceInstBeanDefRegistry4 implements BeanDefinitionRegistryPostProcessor, PriorityOrdered {
private final Logger logger = LoggerFactory.getLogger(getClass());
private List annotationAttributesList;
InterfaceInstBeanDefRegistry4(List annotationAttributesList) {
this.annotationAttributesList = annotationAttributesList;
}
@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
logger.info("InterfaceInst | Interface Instantiation Start (spring 5- or jdk 8-) Doc: https://github.com/shepherdviolet/slate");
Set processedClasses = new HashSet<>(128);
for (AnnotationAttributes annotationAttributes : annotationAttributesList) {
//接口类实例化器
InterfaceInstantiator interfaceInstantiator;
try {
Class interfaceInstantiatorClass = annotationAttributes.getClass("interfaceInstantiator");
interfaceInstantiator = interfaceInstantiatorClass.newInstance();
logger.info("InterfaceInst | InterfaceInstantiator:" + interfaceInstantiatorClass.getName());
} catch (Exception e) {
throw new FatalBeanException("InterfaceInst | InterfaceInstantiator create failed", e);
}
final InterfaceInstantiator interfaceInstantiatorFinal = interfaceInstantiator;
//指定的注解类型
Class annotationClass = annotationAttributes.getClass("annotationClass");
//接口搜索器
ClassPathScanningCandidateComponentProvider beanScanner = new ClassPathScanningCandidateComponentProvider(false) {
@Override
protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
// access interface
return beanDefinition.getMetadata().isInterface();
}
};
//根据注解过滤
if (annotationAttributes.getBoolean("annotationRequired")) {
beanScanner.addIncludeFilter(new AnnotationTypeFilter(annotationClass));
} else {
beanScanner.addIncludeFilter(new TypeFilter() {
@Override
public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) {
return true;
}
});
}
//包路径
String[] basePackages = annotationAttributes.getStringArray("basePackages");
if (basePackages == null || basePackages.length <= 0) {
logger.info("InterfaceInst | Skip, no basePackages");
return;
}
//遍历包路径
for (String basePackage : basePackages) {
//搜索包路径下的接口类定义
logger.info("InterfaceInst | Scan package:" + basePackage);
Set beanDefinitions = beanScanner.findCandidateComponents(basePackage);
if (beanDefinitions == null || beanDefinitions.size() <= 0) {
continue;
}
//遍历接口类定义
for (BeanDefinition beanDefinition : beanDefinitions) {
//类名
String className = beanDefinition.getBeanClassName();
//Bean名
String beanName;
try {
beanName = interfaceInstantiator.resolveBeanName(className);
} catch (Exception e) {
throw new FatalBeanException("InterfaceInst | Resolve bean name failed:" + className, e);
}
//跳过已实例化的接口
if (processedClasses.contains(className)) {
logger.warn("InterfaceInst | Duplicate class(skipped):" + className);
continue;
}
try {
//类
final Class clazz = Class.forName(className);
//Bean定义
BeanDefinition newBeanDefinition = BeanDefinitionBuilder.rootBeanDefinition(InterfaceInstFactoryBean4.class)
.addConstructorArgValue(clazz)
.addConstructorArgValue(interfaceInstantiator)
.getBeanDefinition();
//注册Bean定义
registry.registerBeanDefinition(beanName, newBeanDefinition);
//记录类名
processedClasses.add(className);
logger.info("InterfaceInst | Bean created:" + className + ", name:" + beanName);
} catch (ClassNotFoundException e) {
throw new FatalBeanException("InterfaceInst | Interface class not found:" + className, e);
}
}
}
}
logger.info("InterfaceInst | Interface Instantiation Finished");
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
//do nothing
}
@Override
public int getOrder() {
//register interface beans before others
return Ordered.HIGHEST_PRECEDENCE;
}
}