Next we’ll work on the operation that allows a client to check in on the state of their publishing request,
GetPublishingStatus. When a book is submitted for publishing via our SubmitBookForPublishing operation,
we write to DynamoDB that the request had been queued. We store an item in the table with the
keys: {partition: publishingstatus.123, sort: QUEUED}. When the actual publishing logic is implemented it will create
a new item in DynamoDB when the request starts to be processed: {partition: publishingstatus.123, sort: IN_PROGRESS}.
Finally, when publishing has completed, the publishing logic will again write to DynamoDB:
{partition: publishingstatus.123, sort: SUCCEEDED}.
A call to GetPublishingStatus should retrieve each of the items from DynamoDB that correspond to the provided
publishingStatusId. If no items are found, the provided PublishingStatusNotFoundException should be thrown.
Create the GetPublishingStatusActivity class and implement the GetPublishingStatus operation using the design
documentation’s implementation notes and sequence diagram. When populating the response, you will need to convert
the list of PublishingStatusItems to a list of PublishingStatusRecords. Follow the pattern used in
GetBookActivity when converting the list of BookRecommendations.
Since we haven't implemented the publishing logic, we can't easily generate test data to retrieve with our new API. We
have populated your PublishingStatus table with a few complete publishing status histories to help out with your
testing. The table below contains publishingStatusIds that you can use for the described test case.
| test case | publishingStatusId |
|---|---|
| successful publishing process | publishingstatus.bdd319cb-05eb-494b-983f-6e1b983c4c46 |
| failed publishing process | publishingstatus.4bd41646-b1b2-4627-8304-5180c9b54e00 |
| successful new version published | publishingstatus.2bc206a1-5b41-4782-a260-976c0a291825 |
Run MasteryTaskThreeTests workflow to validate your changes.
Exit Checklist:
- You've implemented
GetPublishingStatus's functionality MasteryTaskThreeTestspasses