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Blueprint Cyclic Dependency [message #986954]

Thu, 22 November 2012 14:13

Johan Eriksson

Messages: 19
Registered: May 2012

Junior Member

I have a case where I have two services that each depend on one another - e.g.

Service A depends on Service B
Service B depends on Service A

I understand from reading the OSGi specification (section 121.2.6 Cyclic Dependencies that this can be resolved making sure there is a "breaking" member - i.e. one of the services has the other as a property (and not a constructor argument). Both Service-beans also need to be declared as singletons (doing that too).

However, even when setting it up this way I still see the container waiting for the dependency on the other service to get satisfied and eventually timing out.

Is this a known issue or am could I be doing something wrong here ?

I'm using Virgo 3.5.0 Final.

Thanks,

/Johan/

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Re: Blueprint Cyclic Dependency [message #989051 is a reply to message #986954]

Tue, 04 December 2012 12:57

Johan Eriksson

Messages: 19
Registered: May 2012

Junior Member

Bumping this thread. Close to a thousand views and no responses ? Glyn ?

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Re: Blueprint Cyclic Dependency [message #989705 is a reply to message #989051]

Fri, 07 December 2012 11:18

Glyn Normington

Messages: 1222
Registered: July 2009

Senior Member

That's a known limitation in Blueprint - see section 121.3 of the spec which shows that all the (mandatory) service dependencies of a given bundle are waited for before any services are published by the bundle. I suspect 121.2.6 is talking about cyclic dependencies within a bundle rather than between bundles.

I wonder if you could break the cycle by making one of the service references optional or using a set which could initially be empty? I haven't much experience of this, but it might give you a direction to explore.

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