问题
Addition to this question: Spring Batch - where does the process run
Once every hour i get a huge file with Usage Data for a set of services. A Usage Data line has a UserId and a ServiceId and how long/much the service has been used.
For each Usage Data i need to check which Subscription the User has, and how much the service cost per. unit for this particular Subscription. This will result in a line i can bill to the user.
For each line:
- Database: Find Subscription by User
- Database: Find Service cost by Subscription
- Task: Calculate price
- Database: Write billing line
It is important to notice that Subscriptions will not always have a cost for a specific service. Because of this each line can fail untill a user adds a cost for the given Subscription and service.
There is alot of logic for each line, and each of these can fail, with a need to rerun.
I have also been thinking of fetching all UserSubscriptions, Subscriptions and SubscriptionServiceCost into memory and then itteration through these, so i will only do a select in the beginning of the flow. Instead of having to do a select for each line. Furthermore i could batch insert the billing line at the end of the flow.
How do i go down the correct path for my design using Spring Batch?
来源：https://stackoverflow.com/questions/31558148/spring-batch-process-lines-in-huge-file-start-new-job-for-each-line