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« Return to Thread: can you create an object in ruby and register it in the JMX server?
Re: can you create an object in ruby and register it in the JMX server?
by Jay McGaffigan
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Thanks!
Well work is asking me to do this for my day job right now ... and they said I can contribute back to the community any Open source stuff I help with. so Double bonus!
So if you have any guidelines on submitting patches let me know. (I've not submitted to open source projects before)
I'm off to look at these links and source
Thanks for your quick reply!
Jay
On Wed, Jun 25, 2008 at 4:00 PM, Thomas E Enebo wrote:
> I wrote something which gets you a good part of the way to what you
want: jruby -S gem install jmx
For making beans in Ruby it looks something like this:
# class MyDynamicMBean < RubyDynamicMBean
# operation "Doubles a value"
# parameter :int, "a", "Value to double"
# returns :int
# def double(a)
# a + a
# end
# end
I only support advertising operations at this point, but plan on
attributes and notifications on a really rainy day (of course
contributions are always welcome). Slightly more details can be found
here (besides the source code + test/examples):
-Tom
On Wed, Jun 25, 2008 at 2:51 PM, Jay McGaffigan <hooligan495@...hooligan495@...> wrote:
> Hi all,
>
> I'm relatively new (6 months) to ruby and jruby. At work we are
> transitioning off of the .net stack to use java, jruby, rails and glassfish
> for some of our video on demand products (also I'm picking java up again
> after 4 years on .net) . As part of this transition I am creating a number
> of infrastructure/utility components for my team to use. Specifically , I
> am in the middle of using a service wrapper (wrapper.tanukisoftware.org) to
> create manageable ruby services. So far I can create a generic service
> framework in ruby that calls out to the Java stuff (and likewise the Java
> stuff can call into the ruby stuff. Mostly this is just to support
> start/stop/restart type of functionality).
>
> Next on my plate is trying to get my Ruby code to hook up to JMX.
> Specifically I would like to be able to create a ruby management bean and be
> able to register it with the platform mbean server. However I'm not sure
> I'll be able to do it so before I go much further I was wondering if anyone
> can offer any thoughts on a) whether my approach is completely untenable,
> and is there a better approach that you would recommend, or b) what I am
> trying to do is just not possible at the moment.
>
> From reading about JMX it looks like there are lots of ways to skin the cat.
> I've looked around online and found a jmx4r gem but that only appears to
> focus on being able to consume and display jmx endpoints. I'd like to be
> able to create ruby objects that bind themselves into the JMX management
> server so they can be viewed. (if I can get this working I am hoping to make
> it generic enough that I'd like to add it to the jmx4r gem or other
> opensource project :) if people think it might be useful)
>
> If I were to go on the assumption that there is nothing out there I've
> thought of a couple of ways I could attempt to do this but I'm not sure they
> will work. (however if there is something out there that someone knows
> about please shout out )
>
> My first thought is that it would be nice to create a ruby object that
> implements the DynamicMBean interface. From there people could mixin a
> module that exposes the management information. The problem I am running
> into is the types aren't aligning when I register my ruby class as an MBean
> :P (I could share code if you are interested).
>
> So I created the following example. (it's gone through a couple of
> incarnations) And let me be the first to say that I don't completely
> understand how to bridge from java to jruby and back so if you can point me
> to places I could get a deeper understanding that'd be great (Ive read the
> examples at the wiki).
>
> I've created a ruby class that inherits from a DynamicBean I've created
> (this example is loosely based on the example on calling Jruby from java
> that's on the Wiki :
>
> Java:
> public class ManageableMBean implements DynamicMBean {
>
> public Object getAttribute(String arg0) throws
> AttributeNotFoundException,
> MBeanException, ReflectionException {
> return null;
> }
>
> public AttributeList getAttributes(String[] arg0) {
> return null;
> }
>
> public MBeanInfo getMBeanInfo() {
> return null;
> }
>
> public Object invoke(String arg0, Object[] arg1, String[] arg2)
> throws MBeanException, ReflectionException {
> return null;
> }
>
> public void setAttribute(Attribute arg0) throws
> AttributeNotFoundException,
> InvalidAttributeValueException, MBeanException,
> ReflectionException {
>
> }
>
> public AttributeList setAttributes(AttributeList arg0) {
> return null;
> }
>
> }
>
>
> Here is my Ruby code:
>
> require 'java'
>
> class Manageable < Java::ManageableMBean
> include javax.management.DynamicMBean #if I could get the call to
> registerMBean to see my object as the java object it represents I might be
> able to remove this include
> def getAttribute(attribute)
> "name"
> end
> def getAttributes(attributes)
> ["name"]
> end
> def getMBeanInfo
> mbi = javax.management.MBeanInfo.new(self.class, "Sample Dynamic
> MBean", null, null, null)
> puts "#{mbi.class}"
> mbi
> end
> def invoke(actionName, params, signature)
> end
> def setAttribute(attribute)
> end
> def setAttributes(attributes)
> end
> def self.register_bean(bean)
> mbs = java.lang.management.ManagementFactory.getPlatformMBeanServer()
> on = javax.management.ObjectName.new("ruby:type=#{bean.class}")
> mbs.registerMBean(bean.java_class, on) #it would be nice to be able to
> coerce the ruby object in to the base java class
> end
> end
>
> bean = Manageable.new
>
> puts "name is #{bean.class}"
>
> Manageable.register_bean(bean)
>
> c = getc.chomp
>
>
>
> Even if I could register the bean with the server I'm not sure this is going
> to work but I was thinking that creating a dsl in ruby would let me hide the
> dynamic nature of the mbean.
>
>
> I might have to go back to the drawing board. Are there any
> pointers/alternate paths I should be exploring?
>
> Thanks!
> Jay
>
>
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