Example usage for org.springframework.aop.framework.autoproxy AutoProxyUtils PRESERVE_TARGET_CLASS_ATTRIBUTE

Introduction

In this page you can find the example usage for org.springframework.aop.framework.autoproxy AutoProxyUtils PRESERVE_TARGET_CLASS_ATTRIBUTE.

Prototype

String PRESERVE_TARGET_CLASS_ATTRIBUTE

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Document

Bean definition attribute that may indicate whether a given bean is supposed to be proxied with its target class (in case of it getting proxied in the first place).

Usage

From source file:org.jdal.aop.SerializableProxyUtils.java

public static BeanDefinitionHolder createSerializableProxy(BeanDefinitionHolder definition,
        BeanDefinitionRegistry registry, boolean proxyTargetClass) {

    String originalBeanName = definition.getBeanName();
    BeanDefinition targetDefinition = definition.getBeanDefinition();

    // Create a scoped proxy definition for the original bean name,
    // "hiding" the target bean in an internal target definition.
    RootBeanDefinition proxyDefinition = new RootBeanDefinition(SerializableProxyFactoryBean.class);
    proxyDefinition.setOriginatingBeanDefinition(definition.getBeanDefinition());
    proxyDefinition.setSource(definition.getSource());
    proxyDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);

    String targetBeanName = getTargetBeanName(originalBeanName);
    proxyDefinition.getPropertyValues().add("targetBeanName", targetBeanName);

    if (proxyTargetClass) {
        targetDefinition.setAttribute(AutoProxyUtils.PRESERVE_TARGET_CLASS_ATTRIBUTE, Boolean.TRUE);
    } else {//from  w  w  w .j  av a  2 s  .c o m
        proxyDefinition.getPropertyValues().add("proxyTargetClass", Boolean.FALSE);
    }

    // Copy autowire settings from original bean definition.
    proxyDefinition.setAutowireCandidate(targetDefinition.isAutowireCandidate());
    proxyDefinition.setPrimary(targetDefinition.isPrimary());
    if (targetDefinition instanceof AbstractBeanDefinition) {
        proxyDefinition.copyQualifiersFrom((AbstractBeanDefinition) targetDefinition);
    }

    // Set singleton property of FactoryBean
    proxyDefinition.getPropertyValues().add("singleton", !targetDefinition.isPrototype());

    // The target bean should be ignored in favor of the scoped proxy.
    targetDefinition.setAutowireCandidate(false);
    targetDefinition.setPrimary(false);

    // Register the target bean as separate bean in the factory.
    registry.registerBeanDefinition(targetBeanName, targetDefinition);

    // Return the scoped proxy definition as primary bean definition
    // (potentially an inner bean).
    return new BeanDefinitionHolder(proxyDefinition, originalBeanName, definition.getAliases());
}

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From source file:org.springframework.context.annotation.ConfigurationClassPostProcessor.java

/**
 * Post-processes a BeanFactory in search of Configuration class BeanDefinitions;
 * any candidates are then enhanced by a {@link ConfigurationClassEnhancer}.
 * Candidate status is determined by BeanDefinition attribute metadata.
 * @see ConfigurationClassEnhancer/*from  w  w  w.  j  a  v  a 2 s  . co  m*/
 */
public void enhanceConfigurationClasses(ConfigurableListableBeanFactory beanFactory) {
    Map<String, AbstractBeanDefinition> configBeanDefs = new LinkedHashMap<>();
    for (String beanName : beanFactory.getBeanDefinitionNames()) {
        BeanDefinition beanDef = beanFactory.getBeanDefinition(beanName);
        if (ConfigurationClassUtils.isFullConfigurationClass(beanDef)) {
            if (!(beanDef instanceof AbstractBeanDefinition)) {
                throw new BeanDefinitionStoreException("Cannot enhance @Configuration bean definition '"
                        + beanName + "' since it is not stored in an AbstractBeanDefinition subclass");
            } else if (logger.isWarnEnabled() && beanFactory.containsSingleton(beanName)) {
                logger.warn("Cannot enhance @Configuration bean definition '" + beanName
                        + "' since its singleton instance has been created too early. The typical cause "
                        + "is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor "
                        + "return type: Consider declaring such methods as 'static'.");
            }
            configBeanDefs.put(beanName, (AbstractBeanDefinition) beanDef);
        }
    }
    if (configBeanDefs.isEmpty()) {
        // nothing to enhance -> return immediately
        return;
    }

    ConfigurationClassEnhancer enhancer = new ConfigurationClassEnhancer();
    for (Map.Entry<String, AbstractBeanDefinition> entry : configBeanDefs.entrySet()) {
        AbstractBeanDefinition beanDef = entry.getValue();
        // If a @Configuration class gets proxied, always proxy the target class
        beanDef.setAttribute(AutoProxyUtils.PRESERVE_TARGET_CLASS_ATTRIBUTE, Boolean.TRUE);
        try {
            // Set enhanced subclass of the user-specified bean class
            Class<?> configClass = beanDef.resolveBeanClass(this.beanClassLoader);
            if (configClass != null) {
                Class<?> enhancedClass = enhancer.enhance(configClass, this.beanClassLoader);
                if (configClass != enhancedClass) {
                    if (logger.isDebugEnabled()) {
                        logger.debug(String.format(
                                "Replacing bean definition '%s' existing class '%s' with "
                                        + "enhanced class '%s'",
                                entry.getKey(), configClass.getName(), enhancedClass.getName()));
                    }
                    beanDef.setBeanClass(enhancedClass);
                }
            }
        } catch (Throwable ex) {
            throw new IllegalStateException("Cannot load configuration class: " + beanDef.getBeanClassName(),
                    ex);
        }
    }
}

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