AsyncExecutionAspectSupport.java 文件源码

/**
 * Retrieve a target executor for the given qualifier.
 * @param qualifier the qualifier to resolve
 * @return the target executor, or {@code null} if none available
 * @since 4.2.6
 * @see #getExecutorQualifier(Method)
 */
protected Executor findQualifiedExecutor(BeanFactory beanFactory, String qualifier) {
    if (beanFactory == null) {
        throw new IllegalStateException("BeanFactory must be set on " + getClass().getSimpleName() +
                " to access qualified executor '" + qualifier + "'");
    }
    return BeanFactoryAnnotationUtils.qualifiedBeanOfType(beanFactory, Executor.class, qualifier);
}