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From "Arnoud Glimmerveen (Jira)" <j...@apache.org>
Subject [jira] [Commented] (ARIES-1940) Failure during service export is not properly handled by RemoteServiceAdminCore
Date Fri, 08 Nov 2019 16:34:00 GMT

    [ https://issues.apache.org/jira/browse/ARIES-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16970378#comment-16970378
] 

Arnoud Glimmerveen commented on ARIES-1940:
-------------------------------------------

I think there is one aspect that needs attention with respect to dealing with failed service
export: how/when is the ExportRegistration removed from the internal state of RemoteServiceAdminCore?

I believe the current implementation relies on a ServiceListener and matching the ServiceReference
with the ServiceReferences referenced by the ExportReference in order to cleanup the internal
administration. However in the failure case only the thrown Exception is stored, so there
is no ServiceReference to match, leaving the failed ExportRegistration in the internal state.


Is this observation accurate or is there some other cleanup-flow I missed?

> Failure during service export is not properly handled by RemoteServiceAdminCore
> -------------------------------------------------------------------------------
>
>                 Key: ARIES-1940
>                 URL: https://issues.apache.org/jira/browse/ARIES-1940
>             Project: Aries
>          Issue Type: Bug
>          Components: Remote Service Admin
>    Affects Versions: rsa-1.14.0
>         Environment: Apache Aries 1.14.0
> Apache Felix Framework 6.0.2
>            Reporter: Arnoud Glimmerveen
>            Priority: Major
>             Fix For: rsa-1.15.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> When a DistributionProvider throws an Exception from the DistributionProvider.exportService()
method, the RemoteServiceAdminCore detects this properly and keeps track of this failure by
creating a ExportRegistration instance that references the thrown Exception.
> The specification mandates that if a service export failed, the ExportRegistration should
provide access to the thrown Exception (which the current implementation does) and that the
ExportReference of the ExportRegistration should throw an IllegalStateException.
> The current implementation of RemoteServiceAdminCore handles this in an inconsistent
way:
> * The ExportRegistration.getExportReference() returns null rather then throwing the IllegalStateException
> * The use of ExportRegistration assumes that there always is an ExportReference instance.
This assumption is wrong in cases that the export failed.
> The latter triggers exceptions such as as the one below; typically triggered by an event
unrelated to the export service failure:
> {noformat}
> java.lang.NullPointerException
>                 at org.apache.aries.rsa.core.RemoteServiceAdminCore.removeServiceExports(RemoteServiceAdminCore.java:505)
>                 at org.apache.aries.rsa.core.RemoteServiceAdminCore$2.serviceChanged(RemoteServiceAdminCore.java:104)
>                 at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
>                 at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
>                 at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
>                 at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
>                 at org.apache.felix.framework.Felix.access$000(Felix.java:112)
>                 at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java:434)
>                 at org.apache.felix.framework.ServiceRegistry.unregisterService(ServiceRegistry.java:170)
>                 at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:145)
>                 ...
> {noformat}



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