Download E-books Enterprise OSGi in Action: With examples using Apache Aries PDF

By Holly Cummins

Summary

Enterprise OSGI in Action is a hands-on consultant for builders utilizing OSGi to construct the following iteration of company Java functions. through offering proper examples and case reports, this booklet publications the reader in the course of the maze of latest 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 consultant for builders utilizing OSGi to construct firm Java functions. Many examples and case experiences assist you to construct, try out, and set up modular net purposes. The booklet explains tips on how to reap the benefits of dynamism, distribution, and automated dependency provisioning, whereas nonetheless integrating with latest Java EE applications.

The booklet is written for Java EE builders. No previous event with OSGi is required.

What's Inside

  • Build modular purposes utilizing servlets, JSPs, WARs, and JPA
  • Better part reuse and robustness
  • Expert information for Apache Aries

Purchase of the print ebook incorporates a loose publication in PDF, Kindle, and ePub codecs from Manning Publications.

About the Authors

Holly Cummins and Tim Ward are lead engineers who usually converse at developerWorks, Devoxx, JavaZone, and EclipseCon. Tim has written criteria in either the OSGi middle and firm requirements and either authors are lively Apache Aries committers.

Table of Contents

    PART 1 PROGRAMMING past hi WORLD
  1. OSGi and the enterprise—why now?
  2. Developing an easy OSGi-based net application
  3. Persistence will pay off
  4. Packaging your corporation OSGi applications
  5. PART 2 development greater firm OSGI APPLICATIONS
  6. Best practices for company applications
  7. Building dynamic purposes with OSGi services
  8. Provisioning and resolution
  9. Tools for construction and testing
  10. IDE improvement tools
  11. PART three INTEGRATING company OSGI WITH every little thing ELSE
  12. Hooking up distant structures with disbursed OSGi
  13. Migration and integration
  14. Coping with the non-OSGi world
  15. Choosing a stack

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"); html. append(""); html. append(""); } The submit process takes the parameters handed throughout from the GET strategy, appears to be like up a store provider, and places the acquisition via. directory three. 10 The doPost() approach to the BuyFood servlet safe void doPost(HttpServletRequest request, HttpServletResponse reaction) throws ServletException, IOException { PrintWriter html = reaction. getWriter(); html. append(""); String customerName = request. getParameter("customerName"); String foodName = request. getParameter("foodName"); String volume = request. getParameter("quantity"); attempt { InitialContext ctx = new InitialContext(); store store = (Shop) ctx. lookup("osgi:service/" + store. type. getName()); stock stock = (Inventory) ctx. search for( "osgi:service/" + stock. type. getName()); Accounting accounting = (Accounting) ctx. search for( "osgi:service/" + Accounting. classification. getName()); buyer shopper = accounting. getCustomer(customerName); if (customer ! = null) { html. append(customer + "
"); } else { html. append(customerName + " is a brand new client.
"); } nutrients foodstuff = stock. getFood(foodName); html. append(food + "
"); html. append(customerName + " attempted to shop for " + volume + " packs of " + foodName + "
"); try out { store. purchase(foodName, customerName, Integer. valueOf(quantity)); consumer refreshedCustomer = accounting . getCustomer(customerName); html. append("Afterwards, " + refreshedCustomer + "
"); } trap (Exception e) { html. append("A challenge occurred: " + e. getMessage() + "
"); } obtain from Wow! publication 82 bankruptcy three patience can pay off foodstuff refreshedFood = stock. getFood(foodName); html. append("And after? " + refreshedFood); } seize (NamingException e) { html. append("We don't have any store this present day. try out back the following day. "); } html. append(""); html. append(""); } you can be dismayed by way of how lengthy this technique is. in truth, just about all of it’s excited about writing output to the web page. the acquisition itself should be controlled in or 3 strains of code. a part of the explanation that writing out the thing states is so verbose is you have to retrieve the items two times: as soon as prior to the acquisition and as soon as after. If this wasn’t a database software, you’d count on that every nutrition or shopper example was once certain. alterations to a meals made in a single a part of the applying (like the store) could instantly be mirrored in nutrition cases in other places. simply because it is a database, issues aren’t really easy. once they have been handed to the BuyFood servlet, the nutrition and shopper circumstances moved outdoor the bounds of the endurance context and have been indifferent. to work out the most recent kingdom of the database after alterations, it’s essential to request new situations of the entity sessions.

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