Support for creating connector spec resources like ConnectionFactory in Resource Adapters

[frowe]

Just as it can be useful to package (embed) a resource adapter and an application together, it could also be useful to be able to allow resource adapters to create what would normally be application defined resources like @ConnectionFactoryDefinition and @ConnectionFactoryDefinitions. This would allow the creation of a self-contained ear that could be deployed to any jakarta ee compliant app server w/o having to deal with server config.

[smillidge]

Do you have any examples of what this would look like?

Payara can do this in the application using code like below and this doesn't require any additional server config.

@ConnectionFactoryDefinition(name = "java:comp/env/KafkaConnectionFactory", 
  description = "Kafka Conn Factory", 
  interfaceName = "fish.payara.cloud.connectors.kafka.api.KafkaConnectionFactory", 
  resourceAdapter = "kafka-rar-0.6.1-SNAPSHOT", 
  minPoolSize = 2, 
  maxPoolSize = 2,
  transactionSupport = TransactionSupportLevel.NoTransaction,
  properties = {"acks=all"
  })

Would we support the same annotations somewhere in the RAR?

[njr-11]

If we did this, I could see putting them on the resource adapter's ManagedConnectionFactory implementation class alongside where it declares the @ConnectionDefinition annotation, in which case interfaceName as well as resourceAdapter attributes could be made optional,

@ConnectorDefinition(connectionFactory = KafkaConnectionFactory.class, ...)
@ConnectionFactoryDefinition(name = "java:comp/eis/KafkaConnectionFactory", 
  description = "Kafka Conn Factory", 
  minPoolSize = 2, 
  maxPoolSize = 2,
  transactionSupport = TransactionSupportLevel.NoTransaction,
  properties = {"acks=all"}
)
public class MyKafkaManagedConnectionFactory implements ManagedConnectionFactory ...