Summary
Enterprise OSGI in Action is a hands-on consultant for builders utilizing OSGi to construct the following iteration of firm Java purposes. via providing proper examples and case reports, this publication publications the reader in the course of the maze of recent criteria and projects.
About This Book
Enterprise OSGi is a suite of criteria for development modular Java purposes which combine seamlessly with latest Java EE applied sciences. It extends the OSGi part framework to allotted systems.
Enterprise OSGi in Action is a hands-on advisor for builders utilizing OSGi to construct firm Java functions. Many examples and case reports assist you to construct, try, and installation modular net purposes. The booklet explains find out how to benefit from dynamism, distribution, and automated dependency provisioning, whereas nonetheless integrating with latest Java EE applications.
The publication is written for Java EE builders. No earlier adventure with OSGi is required.
What's Inside
- Build modular functions utilizing servlets, JSPs, WARs, and JPA
- Better part reuse and robustness
- Expert advice for Apache Aries
Purchase of the print e-book features a unfastened booklet in PDF, Kindle, and ePub codecs from Manning Publications.
About the Authors
Holly Cummins and Tim Ward are lead engineers who frequently converse at developerWorks, Devoxx, JavaZone, and EclipseCon. Tim has written criteria in either the OSGi middle and firm necessities and either authors are energetic Apache Aries committers.
Table of Contents
PART 1 PROGRAMMING past hi WORLD
- OSGi and the enterprise—why now?
- Developing an easy OSGi-based net application
- Persistence can pay off
- Packaging what you are promoting OSGi applications
PART 2 development larger firm OSGI APPLICATIONS
- Best practices for company applications
- Building dynamic functions with OSGi services
- Provisioning and resolution
- Tools for construction and testing
- IDE improvement tools
PART three INTEGRATING company OSGI WITH every little thing ELSE
- Hooking up distant structures with disbursed OSGi
- Migration and integration
- Coping with the non-OSGi world
- Choosing a stack
You’ve bought a couple of other kinds of bundles floating round for the time being, however the source bundles the following don't have anything to do with OSGi bundles—they’re usual Java source bundles. if you happen to construct the package and try the net web page, it's going to paintings precisely because it did prior to. this is often reassuring if you’re looking in English, yet no longer excellent if you’re looking in French. to aim it out: switch your internet browser’s most well-liked language to French. (If you don’t are looking to do this, you could hardcode the locale within the.
JPA and different ORM frameworks upload aid for transparently relocating among database entries and Java gadgets. obtain from Wow! publication 58 bankruptcy three patience can pay off It seems that it’s precisely the classpath that explanations difficulties. JDBC motive force implementations count seriously on Class.forName()and META-INF providers. this kind of mirrored image doesn’t paintings in OSGi with out an specific package deal dependency at the motive force implementation. The DriverManager purely scans the.
most crucial issues approximately degrees of abstraction is that the underlying information don’t bleed via, breaking the abstraction. In Java code this is often in most cases finished via interfaces, factories, and changeable implementations. regrettably for Java, there’s little to avoid a person bypassing your API and beginning to paintings at once with the underlying implementation sessions. essentially this can be a gross violation of the abstraction, yet what if there’s a mode at the implementation object,.
Disappear. This dynamism is quite robust and permits OSGi purposes to do issues that aren’t attainable for traditional functions. 6.4.1 The outstanding showing and disappearing providers What this dynamism ability is that companies can come and cross at any time. It’s attainable required provider isn’t on hand should you desire it. It’s attainable that there’s multiple capability fit for the carrier you would like. It’s attainable new carrier turns into on hand at runtime, or undefined.
Repository, which additionally returns no fits simply because there are not any bundles exporting the fancyfoods.z package deal. instead of fail the solution at this level, the resolver determines that the import is non-compulsory and doesn’t have to be happy for this solution to be legitimate. The resolver studies that the try package deal might be effectively resolved, and that it calls for either package deal A at model 1.0.0 and package deal B at model 1.0.0 to take action. After you’ve made up our minds that the mandatory bundles required to.
