[jira] [Created] (QPID-7495) [Java Broker] Add annotation into ManagedObjectFactoryConstructor for condition expression to evaluate the availability of conditionally available configured object

["Alex Rudyy (JIRA)" <ji...@apache.org>]

Alex Rudyy created QPID-7495:
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             Summary: [Java Broker] Add annotation into ManagedObjectFactoryConstructor for condition expression to evaluate the availability of conditionally available configured object
                 Key: QPID-7495
                 URL: https://issues.apache.org/jira/browse/QPID-7495
             Project: Qpid
          Issue Type: Improvement
          Components: Java Broker
            Reporter: Alex Rudyy


Currently ConditionallyAvailable  configured object implementations declared with annotation _ManagedObjectFactoryConstructor#conditionallyAvailable_ are required to have static method _isAvaialble()_ on configured object implementation  class. If implementation class have compile time dependencies to external classes which might not be present on classpath, the loading of class for such implementation fails with ClassDefNotFoundError  when calling static method Impl#isAvailable() from factory. Thus, in order to have working Impl#isAvailable(), the implementation should not be linked with classes which might not be available when call to check is made.

Alternatively, we can implement a condition expression in _ManagedObjectFactoryConstructor_ which can be evaluated as part of _ConditionallyAvailable#isAvaialble()_ call. That would allow to relax the requirements to implementation class dependencies by having a separate class with static method for availability evaluation which will not have issues with class loading due to not being linked  with not available classes



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