@Override
    public DescribeEventCategoriesResult describeEventCategories(DescribeEventCategoriesRequest request) {
        request = beforeClientExecution(request);
        return executeDescribeEventCategories(request);
    }
<p>
Displays a list of categories for all event source types, or, if specified, for a specified source type. You can
also see this list in the "Amazon RDS event categories and event messages" section of the <a
href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Events.Messages.html"> <i>Amazon RDS User
Guide</i> </a> or the <a
href="https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_Events.Messages.html"> <i>Amazon Aurora
User Guide</i> </a>.
</p>

@param describeEventCategoriesRequest
@return Result of the DescribeEventCategories operation returned by the service.
@sample AmazonRDS.DescribeEventCategories
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/DescribeEventCategories" target="_top">AWS
     API Documentation</a>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/AmazonRDSClient.java