Re: EventAdmin Bundle Installation
Thanks Marcel for the quick response. Can someone help clarify: Can I use EventAdmin to pass the event data from an non-osgi bundle to an osgi bundle? Or is the eventAdmin only used for communicating between osgi bundles? My main application receiving the metrics data/event is non-osgi and it needs to forward this event/data to an osgi-bundle. I was using this before: bundleContext.registerService(SOME_DATA_TYPE, dataHolderMap, null); This works fine for low volume of calls but starts to hang the thread gets blocked. Thanks Masti On Saturday, February 1, 2014 2:44 PM, Marcel Offermans marcel.offerm...@luminis.eu wrote: On 01 Feb 2014, at 23:20 pm, masti whoknows masti...@yahoo.com wrote: Here is simple Java code that I am using to install the EventAdmin bundle //now install the EventAdmin: org.apache.felix.eventadmin 1.3.2 Bundle eventAdminBundle = framework.getBundleContext().installBundle(org.apache.felix.eventadmin); eventAdminBundle.start();Is this not the right way? No, as you can see from your own stacktrace, installBundle takes a location [1] which is interpreted as a URL. Alternatively, you can use the other installBundle method [2] that takes a location (which can then be anything) and an inputstream (to your bundle). That should at least get you to the next point. :) To learn more about embedding Felix, please read [3] and especially the Host/Felix interaction part of that document. It contains a lot of information related to what you're trying to do. Greetings, Marcel [1] http://www.osgi.org/javadoc/r4v43/core/org/osgi/framework/BundleContext.html#installBundle(java.lang.String) [2] http://www.osgi.org/javadoc/r4v43/core/org/osgi/framework/BundleContext.html#installBundle(java.lang.String, java.io.InputStream) [3] http://felix.apache.org/documentation/subprojects/apache-felix-framework/apache-felix-framework-launching-and-embedding.html
Re: EventAdmin Bundle Installation
Neil you are everywhere my Friend! It is good to see people willing to help
others!
You got the understanding of the application correctly. My Application installs
bundles and all bundles live on single JVM.
I am able to install the felix org.apache.felix.eventadmin with version
1.3.2 bundle.
Now pushing the events using the following example:
http://felix.apache.org/site/apache-felix-event-admin.html is not clear with as
how the casting will work.
if (ref != null) { EventAdmin eventAdmin = (EventAdmin)
context.getService(ref);
Here EventAdmin should be casted to what? The only class/package available from
felix is impl package and that does not have EventAdmin.
If I use import org.osgi.service.event.Event;import
org.osgi.service.event.EventAdmin; which I see also available through the same
felix bundle I get the following class cast
exceptionjava.lang.ClassCastException:
org.apache.felix.eventadmin.impl.security.EventAdminSecurityDecorator
incompatible with org.osgi.service.event.EventAdmin
I am sure I am doing something wrong or missing something.
Any pointers are appreciated
Thanks
Masti
On Sunday, February 2, 2014 8:30 AM, Neil Bartlett njbartl...@gmail.com wrote:
On Sun, Feb 2, 2014 at 4:16 PM, masti whoknows masti...@yahoo.com wrote:
Thanks Marcel for the quick response.
Can someone help clarify: Can I use EventAdmin to pass the event data from an
non-osgi bundle to an osgi bundle? Or is the eventAdmin only used for
communicating between osgi bundles?
Yes Event Admin can be used in a non-OSGi environment. However it is not a
remote or distributed event broker, it works purely within a single JVM
(although some people have built remoting gateways or bridges that work
alongside Event Admin).
Therefore if you're talking about using it with both non-OSGi and OSGi
artifacts then you probably mean you have an embedded OSGi framework in your
application. Assuming that's the case, then the embedding application can
interact with Event Admin by publishing an EventHandler interface into OSGi
using the system bundle's BundleContext. The limitation is that the API package
for Event Admin will need to be exported by the system bundle using the
FRAMEWORK_SYSTEM_PACKAGES_EXTRA property.
My main application receiving the metrics data/event is non-osgi and it needs
to forward this event/data to an osgi-bundle. I was using this before:
bundleContext.registerService(SOME_DATA_TYPE, dataHolderMap, null);
Ah yes... I recall your StackOverflow question.
This works fine for low volume of calls but starts to hang the thread gets
blocked.
Thanks
Masti
On Saturday, February 1, 2014 2:44 PM, Marcel Offermans
marcel.offerm...@luminis.eu wrote:
On 01 Feb 2014, at 23:20 pm, masti whoknows masti...@yahoo.com wrote:
Here is simple Java code that I am using to install the EventAdmin bundle
//now install the EventAdmin: org.apache.felix.eventadmin 1.3.2
Bundle eventAdminBundle =
framework.getBundleContext().installBundle(org.apache.felix.eventadmin);
eventAdminBundle.start();Is this not the right way?
No, as you can see from your own stacktrace, installBundle takes a location
[1] which is interpreted as a URL. Alternatively, you can use the other
installBundle method [2] that takes a location (which can then be anything)
and an inputstream (to your bundle).
That should at least get you to the next point. :)
To learn more about embedding Felix, please read [3] and especially the
Host/Felix interaction part of that document. It contains a lot of
information related to what you're trying to do.
Greetings, Marcel
[1]
http://www.osgi.org/javadoc/r4v43/core/org/osgi/framework/BundleContext.html#installBundle(java.lang.String)
[2]
http://www.osgi.org/javadoc/r4v43/core/org/osgi/framework/BundleContext.html#installBundle(java.lang.String,
java.io.InputStream)
[3]
http://felix.apache.org/documentation/subprojects/apache-felix-framework/apache-felix-framework-launching-and-embedding.html
EventAdmin Bundle Installation
Hi OSGi Gurus, I am new to OSGi. I have an application that processes messages/metrics events in a high volume My main application which recieves these events/metrics is an non-OSGi bundle. However, the task for this application is to forward the event/payload to an OSGi bundle. I don't have issues with OSGi bundle as I am able to install the bundle and also added the EventHandler there.My issue occurs when I send the events from my main application. My service reference is always null. In short EventAdmin reference is always null. I am sure I need to install the EventAdmin as a bundle. How can I do it at the top level application? Can you please help me the actual Java code/pseudo that would install the bundle? Dependencies in my pom: dependencies dependency groupIdcom.ebay.external/groupId artifactIducirrus-db/artifactId version0.7.3/version /dependency dependency groupIdorg.apache.felix/groupId artifactIdorg.apache.felix.framework/artifactId version4.2.1/version /dependency dependency groupIdorg.apache.felix/groupId artifactIdorg.apache.felix.bundlerepository/artifactId version1.6.6/version /dependency dependency groupIdorg.ops4j.pax.url/groupId artifactIdpax-url-mvn/artifactId version1.3.6/version /dependency dependency groupIdorg.apache.felix/groupId artifactIdorg.apache.felix.eventadmin/artifactId version1.3.2/version /dependency dependency groupIdmockit/groupId artifactIdjmockit/artifactId version0.999.4/version typejar/type scopetest/scope /dependency dependency groupIdjunit/groupId artifactIdjunit/artifactId scopetest/scope version4.5/version!--$NO-MVN-MAN-VER$ -- /dependency dependency groupIdorg.osgi/groupId artifactIdorg.osgi.core/artifactId version4.3.0/version!--$NO-MVN-MAN-VER$ -- typejar/type scopecompile/scope /dependency dependency groupIdorg.osgi/groupId artifactIdorg.osgi.compendium/artifactId version4.3.1/version typejar/type scopecompile/scope /dependency /dependencies Here is simple Java code that I am using to install the EventAdmin bundle //now install the EventAdmin: org.apache.felix.eventadmin 1.3.2 Bundle eventAdminBundle = framework.getBundleContext().installBundle(org.apache.felix.eventadmin); eventAdminBundle.start();Is this not the right way? Any pointers are highly appreciated Thanks Masti
[osgi-dev] CPU Measurement on a Bundle
Hi All, Is there a way or has anyone done any kind of CPU measurements on Bundles? I have a bunch of bundles and would like to know if there is a way to meausre how much CPU usage is done by each of the bundles. The requirement is to do it in the code and no using any third party profilers (unless they can be hooked into the code at run time to get profiles) Any guidance is highly appreciated. Thanks Masti___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev
Re: [osgi-dev] Question about Memory Usage per Bundle
Hi Chris/BJ, Thanks for the detailed explanation. I knew if I would ask a question here I would get a straight and direct answer! Maybe the work around (this will give a rough estimate) would be to look at the resident objects within a given bundle (include all the objects inside it)? Not sure if that's also possible. -Thanks Masti From: chris.g...@k-embedded-java.com chris.g...@k-embedded-java.com To: OSGi Developer Mail List osgi-dev@mail.osgi.org Sent: Friday, November 18, 2011 4:17 AM Subject: Re: [osgi-dev] Question about Memory Usage per Bundle BJ is right, the quantity you are trying to measure is not well-defined. We were able to modify the Mika VM to associate each allocation with the most local non-system class loader on the stack at the time of allocation, which gives an answer to the question how much memory has this bundle allocated which has not yet been reclaimed by GC, for one possible definition of memory is allocated by a bundle. But if a bundle were generating objects which should be short-lived, but some other bundle is obsessively cacheing them then our system would blame the first bundle when in fact it is the second which is the real culprit. Carrying out measurements when the bundle is loaded/started is probably not very realistic either, I wouldn't expect many Java modules to allocate all the memory they need at startup time. For that you should be looking at something like Fortran (prior to Fortran 90). -- Chris Gray How do you define how much memory a bundle uses? It is generally not possible to do this unless you have a very specific definition of memory use. Bundles can extend classes imported from other bundles. Bundles can call other bundles which allocate memory for the caller. To which bundle does this memory belong? A bundle is a unit of encapsulation and classloader isolation but it is not a unit of memory isolation. From a memory perspective, bundles are very intertwined and it is extremely hard to try and disentangle them. -- BJ Hargrave Senior Technical Staff Member, IBM OSGi Fellow and CTO of the OSGi Alliance hargr...@us.ibm.com office: +1 386 848 1781 mobile: +1 386 848 3788 From: masti whoknows masti...@yahoo.com To: osgi-dev@mail.osgi.org osgi-dev@mail.osgi.org, Date: 2011/11/17 12:51 Subject: [osgi-dev] Question about Memory Usage per Bundle Sent by: osgi-dev-boun...@mail.osgi.org Hi, I am using OSGi to create a plug play framework. My goal is to measure how much memory each bundle is using. Is there a way to do this dynamically when the bundle is loaded/started? Please note I don't want to use any external tools. I want to do it while the system is running. Any help is highly appreciated. Thanks Masti___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev ___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev ___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev
[osgi-dev] Question about Memory Usage per Bundle
Hi, I am using OSGi to create a plug play framework. My goal is to measure how much memory each bundle is using. Is there a way to do this dynamically when the bundle is loaded/started? Please note I don't want to use any external tools. I want to do it while the system is running. Any help is highly appreciated. Thanks Masti___ OSGi Developer Mail List osgi-dev@mail.osgi.org https://mail.osgi.org/mailman/listinfo/osgi-dev
