ExternalIdUpsertPreprocessor (Gerrit Review Plugin API Documentation)

```
public interface ExternalIdUpsertPreprocessor
```
This optional preprocessor is called in ExternalIdNotes before an update is committed.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void upsert(ExternalId extId)
  Called when inserting or updating an external ID.

- Method Detail
  - upsert
```
void upsert(ExternalId extId)
```
    Called when inserting or updating an external ID. ExternalId.blobId() is set. The upsert can be blocked by throwing StorageException, e.g. when a precondition or preparatory work fails.