JMeter: How to provide condition in Beanshell post processor just to log successful/failed signup

Scenario is: 1000 users signup at same time.

Now, if the response message in "View results in a Tree" is "1", its successful registration, But if response message "3", its failed request.

I would like to know how can I handle this in Beanshell Post processor.

OR

Is it possible to have csv with result of all registration?

Something like:

String response = new String(data);

if (response.equals("3")) {
    prev.setSuccessful(false);
}

Where:

• data - is an array of Java bytes holding parent sampler response
• prev - is an instance of SampleResult class providing read/write access to parent sampler methods and fields

More information - How to Use BeanShell: JMeter's Favorite Built-in Component

NB: It will be much faster and easier to go for Response Assertion instead of the Beanshell PostProcessor