@Override
    protected AWSWAFAsync build(AwsAsyncClientParams params) {
        return new AWSWAFAsyncClient(params);
    }
Construct an asynchronous implementation of AWSWAFAsync using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AWSWAFAsync.
aws-java-sdk-waf/src/main/java/com/amazonaws/services/waf/AWSWAFAsyncClientBuilder.java