What Are Pipeline Component Error Levels?
Pipeline components return one of the following values:
1 = OPPERRORLEV_SUCCESS
2 = OPPERRORLEV_WARN
3 = OPPERRORLEV_FAIL
The pipeline keeps track of the highest error value returned by a previously executed component in the pipeline. Attached to each stage in the pipeline is an attribute that indicates the maximum error level the component will tolerate. If the current pipeline error level is less than or equal to the maximum error level for the stage, the next component in the pipeline can run the IPipelineComponent::Execute method. If the maximum error level for the stage is less than the current error level for the pipeline, the remaining components in the stage are skipped and the action is logged.
Error levels are checked upon entrance to stages to improve the user experience. For example, a user has completed the shipping stage, the tax stage, and the payment stage, and has entered incorrect information, causing level 3 errors in any or all of these stages. Instead of prompting the user with a shopper warning after each stage, the user can be presented with just one error before the processing of the credit card in the accept stage. This is because, when the level 3 errors are encountered by the accept stage, which has a maximum error level of 2, it prompts the user with a shopper warning indicating all the errors at one time.