The authors proclaim their preference for AngularJS as the client side framework to use for creating the user interface part of their applications; they do not however show any client side code. I like the example of the TokenProvider based on the Google Plus authentication. Near the end, just before the authors deliver a crushing blow on Portal products Portal servers are hard to use and often heavy weight products they describe Portlets as a way to achieve modularity for the user interface — albeit through the server side which is not modern practice for web applications.
To demonstrate modern modularity for user interfaces the authors do something peculiar in my opinion: they introduce the OpenSocial API and its gadget container specification as their showcase, after having explained how the Open Social API basically failed to fulfill its promise.
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Chapter 9 discusses at length and in useful detail how OSGi bundles can work with relational databases. A simple, straightforward example is given of how a bundle can have an entity manager injected and access entities through that manager. Similar to — but much more lightweight and dynamic than — Java EE resource injection.
I really like the introduction of NoSQL: free from hype and prejudice the authors provide a clear reasoning how sometimes relational databases have to be complemented with NoSQL style database. They suggest polyglot persistence will typically be the way to go with a combination of relational database and NoSQL store. That is really a great job. Pretty cool — and well explained.
This 3rd part is the small one — only 21 pages. It focuses on how to get the OSGi application running outside the development environment, in a stand alone OSGi container that is hosted in a cloud environment private or public. The chapter explains again that the authors prefer Apache Felix over Eclipse Equinox.
They conclude that there is no PaaS that offers a modularized environment — one that has an OSGi container to deploy into.
Creating an OSGi platform in an IaaS environment — either a private or a public one is pretty straightforward, as chapter 10 demonstrates. The key enabler for a smooth deployment of our modular application to this run time environment is Apache ACE — a provisioning server for OSGi. By default Apache ACE runs on port , as does the embedded Jetty server so in order to use both we need to change the port for one of the two.
The book unfortunately does not provide instructions on how to change the port, even though most readers will want to because of this port conflict. The authors explain in a few pages how to set up Apache ACE and how to use it for deployment — including parameterized configuratoin.
The second part of chapter 10 was a little bit harder to understand. It discusses autoscaling of our infrastructure, more specifically auto-scaling in Amazon EC2. The chapter the shows a Groovy script and a Bash script and two console commands — and I get lost a little. The automatic scheduled creation and discarding of Amazon AMIs is demonstrated with the console commands. I found this section the hardest to understand in the book that I consider very clear in all other parts. It feels like perhaps the authors tried to cram to much information into a few pages deployment to Amazon EC2, auto-scaling, automatic startup script to register AMI with ACE,….
Chapter 11 explains how some Java EE application servers have a built in OSGi container that allows us to deploy the modular application to a familiar server environment. The authors strongly doubt the need, usefulness and desirability of using a Java EE container but if management or other powers that be insist, it can be done. This approach kills run time modularization though. Glassfish seems to be the favorite in these conditions. It supports simple deployment of OSGi applications. WebSphere seems to be somewhere in between the two. One application server the authors completely fail to mention is the recent WebLogic Server Appendix A — the last part of the book — describes a sample application.
It is like a bonus, a reference application, that shows all pieces of the modular OSGi Web Application introduced in the book applied together in a fairly simple application. The sample is available from Git and can easily be accessed by the reader. As you may have gathered from the previous comments: I like this book. It is well written, concise and straightforward in its recommendations.
Building Modular Cloud Apps with OSGi
Glassfish Architecture. First part Introduction. Over time, GlassFish has evolved into a server platform that is much more than the reference implementation of the Java EE specifcations. It is now a highly.
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Objectives At the end of this chapter, participants should be able to: Understand basic WebLogic Server architecture Understand the. Webster Chief Architect dawebster up. IBM IBM Family Providing the right application foundation to meet your business needs Highlights Build a strong foundation and reduce costs with the right application server for your business needs Increase. Objectives At the end of this chapter, participants will be able to understand: Web server management options provided by Network Deployment Clustered Application Servers Cluster creation and management.
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Start display at page:. Download "Developing modular Java applications". Rodney Simon Wilkins 4 years ago Views:. Similar documents. Copying, publishing or distributing without express written permission More information. Rapid Application Development. A current problem is it's success: so many libraries, More information. Duration 24 hours Course Objectives Upon completion More information. White Paper: 1 Architecture Objectives: The primary objective of this architecture is to meet the.
More information. Course Description. Course Audience. Course Outline. GlassFish v3. Building an ex tensible modular Java EE application server. These tasks include starting and More information.
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In this paper, I am not discussing following two issues since each is currently hotly debated in various communities: PHP vs. Client Overview. Engagement Situation. Key Requirements for Platform Development : Client Overview Our client is the leading provider of software solutions for providing online and easy access to health insurance.
Our client offers these services to a range of consumers from employees More information. On the classpath this isn't really an issue because every piece of code can use any piece of code, and if there's something private on there you can use reflection to bypass any access restrictions that Java puts on this code. Now what happens if you move to modules?
You get what we call strong encapsulation where we can actually hide code inside of a module. And the service implementations that you use in your application are particularly relevant to hiding because you don't want people to code to these implementations, you want them to code to your interfaces. But what happens if you hide these implementations inside your module? They are also hidden from the frameworks that are trying to access it reflectively, because we're now in a modular world.
If your application module doesn't export this service class then Spring won't be able to pry its way into it and to inject into a private field of this class. One solution will be to say, OK, if that's the case, then we probably would have to export this service implementation from my module because Spring uses it, but doing so you're voiding the advantages that modules give you.
That is really not a nice solution. What you can do, and what we'll look at in the talk, is to use a concept called open modules.