{"id":18220,"date":"2013-10-19T15:00:19","date_gmt":"2013-10-19T12:00:19","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=18220"},"modified":"2013-10-18T10:20:54","modified_gmt":"2013-10-18T07:20:54","slug":"hawtio-apache-jclouds","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/10\/hawtio-apache-jclouds.html","title":{"rendered":"Hawtio & Apache JClouds"},"content":{"rendered":"

Introduction<\/h2>\n

I’ve spent some time lately working on an Apache Jclouds<\/a>\u00a0plugin for Hawtio<\/a>. While there is still a lot of pending work, I couldn’t hold my excitement and wanted to share…<\/p>\n

What is this Hawtio\u00a0anyway?<\/h2>\n

Whenever a cool open source project is brought to my attention, I usually subscribe to the mailing lists so that I can get a better feel of the projects progress, direction etc. Sooner or later there is always an email with the topic ” [Discuss] – Webconsole for our cool project<\/b>“.<\/p>\n

Such emails quite often end up in a long discussion about what’s the best web framework to use, what should be the target platform and how the console could be integrated with upstream\/downstream projects.<\/p>\n

A very good example is Apache ServiceMix<\/a>. ServiceMix runs on Apache Karaf<\/a>, which runs on Apache Felix<\/a>\u00a0and also embeds Apache ActiveMQ<\/a>\u00a0and every single of those projects has its own webconsole.<\/p>\n

The number of consoles grows so big, that users have to hire a personal assistance just to keep track of the URLs of each web console. Well, maybe that’s an overstatement but you get the idea. And if we also take into consideration that some projects are bound to a specific runtime, while others are not then we have a perfect webconsole storm.<\/p>\n

Hawtio<\/a>\u00a0solves this problem, by providing a lightweight HTML5 modular web console with tons of plugins. Hawtio<\/a>\u00a0can run everywhere as its not bound to a specific runtime, and its modular, which means that its pretty easy to write and hook your own plugins.<\/p>\n

Writing plugins for Hawtio<\/h2>\n

Hawtio<\/a>\u00a0is a full client framework. Whenever it requires communication with the backend it can use rest. To make things easier it also use Jolokia<\/a>\u00a0that exposes JMX with JSON over HTTP. This makes it pretty easy to hook frameworks even if they don’t already provide a rest interface, but expose things over JMX.<\/p>\n

Once, the communication with the backend is sorted, its pretty easy to create a plugin. Hawtio<\/a>\u00a0uses AngularJS<\/a>, which makes development of webapps a real pleasure.<\/p>\n

The Jclouds plugin<\/h2>\n

Apache Jclouds<\/a>\u00a0doesn’t have yet a rest interface, nor it has JMX support. Well actually it has pluggable JMX support as of 1.6.1-incubating release. All you need to do is to create a Apache Jclouds<\/a>\u00a0Context using the ManagementLifecycle module:<\/p>\n

ContextBuilder builder = ContextBuilder.newBuilder(providerOrApi).\r\n                                       .credentials(identity, credential)\r\n                                       .modules(ImmutableSet.<Module>of(new ManagementLifecycle(BaseManagementContext.INSTANCE)))\r\n                                       .build();<\/pre>\n
Note:<\/strong> Users that are using the jclouds-karaf project, will get that for free (no need to do anything at all).
 
<\/div> <\/div><\/p>\n
When the ManagementLifecycle plugin is used, it will create and register Apache Jclouds<\/a>\u00a0MBeans to JMX. If those mbeans are discovered by Hawtio<\/a>, a new tab will be added in the Hawtio<\/a>\u00a0user interface:<\/p>\n
\"The<\/a>
The main Jclouds plugin Page<\/figcaption><\/figure>
\n
\"The<\/a>
The EC2 Api details page<\/figcaption><\/figure><\/p>\n
From there the user is able to browse all installed Apache Jclouds<\/a>\u00a0providers, apis and services. If for example, you have created a compute service context with the MangementLifecycle module, you’ll be able to see in it under the ” Compute Service<\/b>” tab:<\/p>\n
\"List<\/a>
List of Compute Services – Amazon AWS & A Stub service.<\/figcaption><\/figure><\/p>\n
By selecting one of the available services, a details bar appears, which helps you navigate to all service specific tabs. For a compute service its:<\/p>\n