I'm beginning to understand just how much I don't understand. Is there some documentation on how iPojo works? How factories are created and how instances are created? Esp. with how they work with FileInstaller? I'm stumped.
When I use INSTANCE strategy I'm seeing the two instances being created from the cfg files but then I'm seeing two new instances being created when my KNClient asks for a list, but those don't have any configuration in the properties (just the defaults). When I use SINGLETON, the list from the @Requires in the KNClient actually contains the two instances that were created by the cfg files but that's when I get (sometimes) the cycle error. When I use immediate=true, the instances (object instances) are created but can't be seen by the arch command. It's all over the place on how these things work, and none of it seems consistent. I can't find any documentation about when and where instances (object or iPojo) are created and what the difference is between when/where the constructor on components/services are called verses the @Validate methods are called. Please help me out. Thanks. - Joel > -----Original Message----- > From: Clement Escoffier [mailto:[email protected]] > Sent: Wednesday, September 23, 2009 11:37 AM > To: [email protected] > Subject: Re: @Requires : ServiceFactory.getService() resulted in a cycle. > > > On 23.09.2009, at 19:33, Joel Schuster wrote: > > > As a side note... might this be a problem with the @Provides in the > > RxTx service? If the default strategy is SINGLETON, how does > > multiple cfg files create multiple instances? Or is this just > > referring to the factory? > > The singleton policy just says that each iPOJO instance will have one > one service object. But you can have several iPOJO instance (each with > one service object). However, be care if you use statics (because they > are shared.) > > Clement > > > > > - Joel > > > >> -----Original Message----- > >> From: Joel Schuster [mailto:[email protected]] > >> Sent: Wednesday, September 23, 2009 11:03 AM > >> To: '[email protected]' > >> Subject: RE: @Requires : ServiceFactory.getService() resulted in a > >> cycle. > >> > >> Clement, > >> > >> I have an rxtx bundle. I use cfg files to create one or more ipojo > >> instances of my rxtx service. These cfg files have stuff like baud, > >> parity, com port name, etc. > >> > >> I have another bundle that uses just one of those, I get the list > >> of all > >> of them and then pick one based on a property within the rxtx > >> service also > >> configured by the cfg files. > >> > >> So: > >> > >> KNClient (instance from cfg file) > >> | > >> V > >> <uses one of x number based on property set in rxtx cfg file> > >> | > >> V > >> SerialRxTx (instances from cfg files) > >> > >> I tried putting immediate=true on the RxTx service, however the cfg > >> files > >> no longer were setting the properties and the arch command no longer > >> showed any instances being created even though the constructor for > >> the > >> service was being called. As the KNClient is not a service, just a > >> component, it is automatically immediate. > >> > >> Thanks for your help! > >> > >> - Joel > >> > >>> -----Original Message----- > >>> From: Clement Escoffier [mailto:[email protected]] > >>> Sent: Wednesday, September 23, 2009 12:53 AM > >>> To: [email protected] > >>> Subject: Re: @Requires : ServiceFactory.getService() resulted in a > >> cycle. > >>> > >>> Hi, > >>> > >>> It sounds like a cycle during object creation. iPOJO object are > >>> created when needed by default (if your component provides a > >>> service). > >>> To handle that iPOJO uses OSGi service factories. > >>> > >>> The problem sounds to be the following: > >>> - a service is going to be used > >>> - iPOJO creates the pojo object (because, we need it) > >>> - this object can also depending on a service, which may use the one > >>> of the previous ones.... Cycle > >>> > >>> To break the cycle, you can set one component to immediate. In that > >>> case, the object will be created eagerly. the big question is : > >>> Which > >>> ones. > >>> > >>> If you gives me more detail on your system, I can figure out how to > >>> break the cycle. > >>> > >>> Regards, > >>> > >>> Clement > >>> > >>> On 22.09.2009, at 23:21, Joel Schuster wrote: > >>> > >>>> > >>>> > >>>> I hate sending stack traces but I'm running into a real nasty > >>>> issue. > >>>> I've tried both Felix 1.8.x and 2.0. I get the same issue. I've > >>>> tried various forms of the @Requires annotation. > >>>> > >>>> This problem is sometimes reproducible on two systems but not on > >>>> the > >>>> third so I'm beginning to suspect a race condition of some sort as > >>>> it only manifests some of the time and is sometimes dependant upon > >>>> the order of the bundle loading. > >>>> > >>>> I have one bundle that @Requires a collection of instances from > >>>> another bundle that implements two different interfaces, also each > >>>> in their own bundles. I've created a test set of bundles to see if > >>>> the problem comes from the inheritance model, but I can't reproduce > >>>> in a smaller example. Yet another reason it feels like a race > >>>> condition. > >>>> > >>>> Thoughts? > >>>> > >>>> > >>>> > >>>> > >>>> -> ERROR: EventDispatcher: Error during dispatch. > >>>> (java.lang.IllegalStateException: ServiceFactory.getService() > >>>> resulted in a cycle.) > >>>> java.lang.IllegalStateException: ServiceFactory.getService() > >>>> resulted in a cycle. > >>>> at > >>>> org > >>>> .apache > >>>> .felix.framework.ServiceRegistry.getService(ServiceRegistry.java: > >>>> 261) > >>>> at org.apache.felix.framework.Felix.getService(Felix.java:2881) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework.BundleContextImpl.getService(BundleContextImpl.java: > >>>> 357) > >>>> at > >>>> org.apache.felix.ipojo.IPojoContext.getService(IPojoContext.java: > >>>> 260) > >>>> at org.apache.felix.ipojo.util.Tracker.getService(Tracker.java: > >>>> 434) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo.util.DependencyModel.ungetService(DependencyModel.java: > >>>> 917) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo.util.DependencyModel.manageDeparture(DependencyModel.java: > >>>> 435) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo.util.DependencyModel.removedService(DependencyModel.java: > >>>> 424) > >>>> at org.apache.felix.ipojo.util.Tracker > >>>> $Tracked.untrack(Tracker.java: > >>>> 736) > >>>> at org.apache.felix.ipojo.util.Tracker > >>>> $Tracked.serviceChanged(Tracker.java:636) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .util > >>>> .EventDispatcher > >>>> .invokeServiceListenerCallback(EventDispatcher.java: > >>>> 878) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .util.EventDispatcher.fireEventImmediately(EventDispatcher.java: > >>>> 732) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .util.EventDispatcher.fireServiceEvent(EventDispatcher.java:662) > >>>> at > >>> org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:3603) > >>>> at org.apache.felix.framework.Felix.access$000(Felix.java:40) > >>>> at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java: > >>>> 624) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework.ServiceRegistry.unregisterService(ServiceRegistry.java: > >>>> 117) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java: > >>>> 128) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .providedservice > >>>> .ProvidedService.unregisterService(ProvidedService.java:298) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .providedservice > >>>> .ProvidedServiceHandler.__stateChanged(ProvidedServiceHandler.java: > >>>> 435) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .providedservice > >>>> .ProvidedServiceHandler.stateChanged(ProvidedServiceHandler.java) > >>>> at > >>>> org > >>>> .apache.felix.ipojo.InstanceManager.setState(InstanceManager.java: > >>>> 451) > >>>> at > >>>> org.apache.felix.ipojo.InstanceManager.stop(InstanceManager.java: > >>>> 340) > >>>> at org.apache.felix.ipojo.util.Property.invoke(Property.java:502) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .configuration > >>>> .ConfigurationHandler.__onCreation(ConfigurationHandler.java:432) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .configuration > >>>> .ConfigurationHandler.onCreation(ConfigurationHandler.java) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java: > >>>> 787) > >>>> at org.apache.felix.ipojo.handlers.providedservice.ProvidedService > >>>> $SingletonStrategy.getService(ProvidedService.java:438) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .providedservice.ProvidedService.getService(ProvidedService.java: > >>>> 263) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .ServiceRegistrationImpl > >>>> .getFactoryUnchecked(ServiceRegistrationImpl.java:293) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework > >>>> .ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java: > >>>> 207) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.framework.ServiceRegistry.getService(ServiceRegistry.java: > >>>> 307) > >>>> at org.apache.felix.framework.Felix.getService(Felix.java:2881) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .framework.BundleContextImpl.getService(BundleContextImpl.java: > >>>> 357) > >>>> at > >>>> org.apache.felix.ipojo.IPojoContext.getService(IPojoContext.java: > >>>> 260) > >>>> at org.apache.felix.ipojo.util.Tracker.getService(Tracker.java: > >>>> 426) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.util.DependencyModel.getService(DependencyModel.java: > >>>> 901) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .dependency.Dependency.createServiceObject(Dependency.java: > >>>> 481) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.handlers.dependency.Dependency.onGet(Dependency.java: > >>>> 456) > >>>> at > >>>> org.apache.felix.ipojo.InstanceManager.onGet(InstanceManager.java: > >>>> 944) > >>>> at > >>>> com > >>>> .navsys.mcmpge.kearfott.knclient.KNClient.__getcomms(KNClient.java) > >>>> at > >>>> com.navsys.mcmpge.kearfott.knclient.KNClient.<init>(KNClient.java: > >>>> 49) > >>>> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > >>>> Method) > >>>> at > >>>> sun > >>>> .reflect > >>>> .NativeConstructorAccessorImpl > >>>> .newInstance(NativeConstructorAccessorImpl.java:39) > >>>> at > >>>> sun > >>>> .reflect > >>>> .DelegatingConstructorAccessorImpl > >>>> .newInstance(DelegatingConstructorAccessorImpl.java:27) > >>>> at java.lang.reflect.Constructor.newInstance(Constructor.java:513) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.InstanceManager.createObject(InstanceManager.java:600) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java: > >>>> 776) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .lifecycle > >>>> .callback > >>>> .LifecycleCallbackHandler > >>>> .__stateChanged(LifecycleCallbackHandler.java:156) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo > >>>> .handlers > >>>> .lifecycle > >>>> .callback > >>>> .LifecycleCallbackHandler > >>>> .stateChanged(LifecycleCallbackHandler.java) > >>>> at > >>>> org > >>>> .apache.felix.ipojo.InstanceManager.setState(InstanceManager.java: > >>>> 440) > >>>> at > >>>> org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java: > >>>> 321) > >>>> at > >>>> org > >>>> .apache > >>>> .felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java: > >>>> 155) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java: > >>>> 298) > >>>> at > >>>> org > >>>> .apache > >>>> .felix > >>>> .ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java: > >>>> 235) > >>>> at > >>> org.apache.felix.ipojo.IPojoFactory.updated(IPojoFactory.java:603) > >>>> at org.apache.felix.cm.impl.ConfigurationManager > >>>> $UpdateConfiguration.run(ConfigurationManager.java:1460) > >>>> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:88) > >>>> > >>>> --------------------------------------------------------------------- > >>>> To unsubscribe, e-mail: [email protected] > >>>> For additional commands, e-mail: [email protected] > >>>> > >>> > >>> > >>> --------------------------------------------------------------------- > >>> To unsubscribe, e-mail: [email protected] > >>> For additional commands, e-mail: [email protected] > >> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: [email protected] > >> For additional commands, e-mail: [email protected] > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
