@Override
    public ReservedDBInstance purchaseReservedDBInstancesOffering(PurchaseReservedDBInstancesOfferingRequest request) {
        request = beforeClientExecution(request);
        return executePurchaseReservedDBInstancesOffering(request);
    }
<p>
Purchases a reserved DB instance offering.
</p>

@param purchaseReservedDBInstancesOfferingRequest
@return Result of the PurchaseReservedDBInstancesOffering operation returned by the service.
@throws ReservedDBInstancesOfferingNotFoundException
        Specified offering does not exist.
@throws ReservedDBInstanceAlreadyExistsException
        User already has a reservation with the given identifier.
@throws ReservedDBInstanceQuotaExceededException
        Request would exceed the user's DB Instance quota.
@sample AmazonRDS.PurchaseReservedDBInstancesOffering
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/PurchaseReservedDBInstancesOffering"
     target="_top">AWS API Documentation</a>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/AmazonRDSClient.java