PropertyMapEventListener is incomplete / underspecified

[adutra]

Describe the bug

Currently, PropertyMapEventListener implements only one method from PolarisEventListener – all others are ignored. It is unclear if this is on purpose.

Furthermore:

• The API is not ideal: transformAndSendEvent takes a HashMap parameter, and it is unclear whether the requirement for a HashMap (instead of Map) is legit.
• The only implemented method – onAfterRefreshTable does not serialize all the event fields. Again, it is unclear if this is by design or an oversight.

And finally, the whole point of having an abstract class that transforms events into Maps, only to have the Maps transformed into Json (cf. AwsCloudWatchEventListener) seems unnecessary.

If the target serialization format is Json, it would be beneficial to provide Jackson serialization info in the event types themselves, e.g.:

  public record AfterRefreshTableEvent(
      @JsonProperty("catalog_name")
      String catalogName,
      @JsonProperty("table_identifier")
      TableIdentifier tableIdentifier)
      implements PolarisEvent {}

Or alternatively:

  @JsonNaming(SnakeCaseStrategy.class)
  public record AfterRefreshTableEvent(
      String catalogName,
      TableIdentifier tableIdentifier)
      implements PolarisEvent {}

The above would be naturally serialized as:

{
  "catalog_name" : "test_catalog",
  "table_identifier" : {
    "namespace" : [ "test_namespace" ],
    "name" : "test_table"
  }
}

Without the need for PropertyMapEventListener.

PropertyMapEventListener will also become problematic for larger payloads e.g. TableMetadata as the serialization logic is not well-defined (which fields to include? which case? which order?)

To Reproduce

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Actual Behavior

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Expected Behavior

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Additional context

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System information

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