Interface for BatchJob strategies

[fPolic]

Goal
Create a common interface that BatchJob strategies implement

DoD

• Create and export IBatchJobStrategy interface in /interfaces
• Exports AbstractBatchJobStrategy from same file
• Strategies loader should register all BatchJobStrategies in an array that can be used from the BatchJobService
• All handlers should include static props called identifier and batchType which will be used to identify which batch type the handler can be used for

Comments

interface {

  /*
  * Used in the API controller to verify that the `context` param is valid
  */
  validateContext()
  
  /*
  *  Method does the actual processing of the job. Should report back on the progress of the operation.
  */
  processJob()
  
  /*
  *  Method performs the completion of the job. Will not be run if `processJob` has already moved the BatchJob to a `complete` status.
  */
  completeJob()

  /**
   * Validates that the file can be used for processJob
   */
  validateFile(fileLocation: string)

  /**
   * Builds and returns a template file that can be downloaded and filled in
   */
  buildTemplate()
}

[srindom]

We might need to extend the interface a bit - let's include:

/**
 * Validates that the file can be used for processJob
 */
validateFile(fileLocation: string)

/**
 * Builds and returns a template file that can be downloaded and filled in
 */
buildTemplate()

Also, all handlers should include static props called identifier and batchType which will be used to identify which batch type the handler can be used for.

E.g.

class ProductImportHandler extends AbstractBatchJobHandler {
  static identifier = "my-handler"
  static batchType = "product_import"
}

[srindom]

Also, I think we should maybe rename these to *Strategy. E.g. ProductImportStrategy just to keep consistent with an existing pattern instead of introducing a new one - wdyt?

cc: @kasperkristensen

[srindom]

• Create and export IBatchJobStrategy interface in /interfaces
• Exports AbstractBatchJobStrategy from same file
• Strategies loader should register all BatchJobStrategies in an array that can be used from the BatchJobService