public void preInstantiateSingletons() throws BeansException {
if (logger.isDebugEnabled()) {
logger.debug("Pre-instantiating singletons in factory [" + this + "]");
}
// The superclass's variable by this name is declared private.
String[] beanDefinitionNames = getBeanDefinitionNames();
String beanName = null; // Remember in case of an exception
try {
// for (Iterator it = this.beanDefinitionNames.iterator();
// it.hasNext();) {
for (int i = 0; i < beanDefinitionNames.length; i++) {
beanName = beanDefinitionNames[i];
if (!containsSingleton(beanName) && containsBeanDefinition(beanName)) {
RootBeanDefinition bd = (RootBeanDefinition) getMergedBeanDefinition(beanName);
if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
if (bd.hasBeanClass() && FactoryBean.class.isAssignableFrom(bd.getBeanClass())) {
FactoryBean factory = (FactoryBean) getBean(FACTORY_BEAN_PREFIX + beanName);
if (factory.isSingleton()) {
getBean(beanName);
}
} else {
getBean(beanName);
}
}
}
}
} catch (BeansException ex) {
// Destroy already created singletons to avoid dangling resources.
logger.error(
"Failed to preinstantiate the singleton named "
+ beanName
+ ". Destroying all Spring beans.",
ex);
try {
destroySingletons();
} catch (Exception ex2) {
logger.error(
"Pre-instantiating singletons failed, and couldn't destroy already created singletons: "
+ ex2,
ex2);
}
throw ex;
}
}
/** Match the given qualifier annotation against the candidate bean definition. */
protected boolean checkQualifier(
BeanDefinitionHolder bdHolder, Annotation annotation, TypeConverter typeConverter) {
Class<? extends Annotation> type = annotation.annotationType();
RootBeanDefinition bd = (RootBeanDefinition) bdHolder.getBeanDefinition();
AutowireCandidateQualifier qualifier = bd.getQualifier(type.getName());
if (qualifier == null) {
qualifier = bd.getQualifier(ClassUtils.getShortName(type));
}
if (qualifier == null) {
Annotation targetAnnotation = null;
if (bd.getResolvedFactoryMethod() != null) {
targetAnnotation = AnnotationUtils.getAnnotation(bd.getResolvedFactoryMethod(), type);
}
if (targetAnnotation == null) {
// look for matching annotation on the target class
if (this.beanFactory != null) {
Class<?> beanType = this.beanFactory.getType(bdHolder.getBeanName());
if (beanType != null) {
targetAnnotation =
AnnotationUtils.getAnnotation(ClassUtils.getUserClass(beanType), type);
}
}
if (targetAnnotation == null && bd.hasBeanClass()) {
targetAnnotation =
AnnotationUtils.getAnnotation(ClassUtils.getUserClass(bd.getBeanClass()), type);
}
}
if (targetAnnotation != null && targetAnnotation.equals(annotation)) {
return true;
}
}
Map<String, Object> attributes = AnnotationUtils.getAnnotationAttributes(annotation);
if (attributes.isEmpty() && qualifier == null) {
// if no attributes, the qualifier must be present
return false;
}
for (Map.Entry<String, Object> entry : attributes.entrySet()) {
String attributeName = entry.getKey();
Object expectedValue = entry.getValue();
Object actualValue = null;
// check qualifier first
if (qualifier != null) {
actualValue = qualifier.getAttribute(attributeName);
}
if (actualValue == null) {
// fall back on bean definition attribute
actualValue = bd.getAttribute(attributeName);
}
if (actualValue == null
&& attributeName.equals(AutowireCandidateQualifier.VALUE_KEY)
&& expectedValue instanceof String
&& bdHolder.matchesName((String) expectedValue)) {
// fall back on bean name (or alias) match
continue;
}
if (actualValue == null && qualifier != null) {
// fall back on default, but only if the qualifier is present
actualValue = AnnotationUtils.getDefaultValue(annotation, attributeName);
}
if (actualValue != null) {
actualValue = typeConverter.convertIfNecessary(actualValue, expectedValue.getClass());
}
if (!expectedValue.equals(actualValue)) {
return false;
}
}
return true;
}