How do you customize and extend Spring Batch Assert Exit Code to suit your specific needs?

1 Why customize Assert Exit Code?

By default, the Assert Exit Code class expects the exit code of a batch job to be either COMPLETED or NOOP, which means that the job either finished successfully or did nothing. However, in some cases, you may want to accept other exit codes as valid, such as STOPPED or FAILED, depending on the business logic or the error handling strategy. For example, you may want to allow a job to stop gracefully if it encounters a certain condition, or you may want to retry a failed job later. In these situations, you need to customize the Assert Exit Code class to avoid throwing unnecessary exceptions.

2 How to customize Assert Exit Code?

The easiest way to customize the Assert Exit Code class is to override its assertExitCode method, which takes a JobExecution object as a parameter and checks its exit code. You can use the @Override annotation to indicate that you are modifying the behavior of the superclass method. In the overridden method, you can implement your own logic to determine which exit codes are acceptable and which are not. For example, you can use a switch statement to check the exit code and throw an exception only for certain cases. Alternatively, you can use a set or a list to store the valid exit codes and check if the exit code is contained in it.

3 How to extend Assert Exit Code?

Another way to customize the Assert Exit Code class is to extend it and add new methods or fields. This way, you can reuse the existing functionality of the superclass and add your own features. For example, you can add a constructor that takes a collection of valid exit codes as an argument and assigns it to a field. Then, you can use this field in the assertExitCode method to check the exit code. You can also add a setter or a getter method to modify or access the field. By extending the Assert Exit Code class, you can create your own subclass that suits your specific needs.

4 How to use custom Assert Exit Code?

Once you have customized or extended the Assert Exit Code class, you can use it in your batch application as you would normally use the original class. You can instantiate your custom class and pass it to the JobLauncherTestUtils class, which is a helper class that allows you to launch and test batch jobs. You can also use the @Autowired annotation to inject your custom class into your test classes. Then, you can use the assertExitCode method of your custom class to verify the exit code of your batch jobs. You can also use other methods or fields of your custom class if you have added them.

5 What are the benefits of customizing Assert Exit Code?

By customizing or extending the Assert Exit Code class, you can gain more control and flexibility over the exit code verification of your batch jobs. You can handle different scenarios and requirements that are not covered by the default behavior of the class. You can also improve the readability and maintainability of your code by using meaningful names and values for your custom class and its methods or fields. You can also reuse your custom class across different batch applications or tests, as long as they share the same exit code logic.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?