Why osgi

The impact doesn't actually come from OSGi at all. The impact comes from the outcomes resulting from designing a system using a modular approach. Further to this general definition, you might consider that regardless of which context is used for obtaining a more specific one, it becomes quickly apparent that "modularity" is a benefit rather than impediment. However, when we do look at a specific definition in the context of software design we see how it clearly applies and might relate to the aspects above:.

The logic of partitioning may be based on related functions, implementation considerations, data links, or other criteria. Plainly, a modular system allows that the interal details each module be altered without affecting other modules in the system.

Imagine if this were true for Liferay on a wider scale. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site. Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance.

Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions. Overview Pearson Education, Inc.

Collection and Use of Information To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including: Questions and Inquiries For inquiries and questions, we collect the inquiry or question, together with name, contact details email address, phone number and mailing address and any other additional information voluntarily submitted to us through a Contact Us form or an email.

Surveys Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Contests and Drawings Occasionally, we may sponsor a contest or drawing. Newsletters If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information informit. Service Announcements On rare occasions it is necessary to send out a strictly service related announcement.

Customer Service We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form. Other Collection and Use of Information Application and System Logs Pearson automatically collects log data to help ensure the delivery, availability and security of this site.

Web Analytics Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. Cookies and Related Technologies This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising.

Security Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure. Children This site is not directed to children under the age of Marketing Pearson may send or direct marketing communications to users, provided that Pearson will not use personal information collected or processed as a K school service provider for the purpose of directed or targeted advertising.

Such marketing is consistent with applicable law and Pearson's legal obligations. Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing. Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn. Sale of Personal Information Pearson does not rent or sell personal information in exchange for any payment of money.

Supplemental Privacy Statement for California Residents California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. Sharing and Disclosure Pearson may disclose personal information, as follows: As required by law. Links This web site contains links to other sites. Requests and Contact Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Last Update: November 17, The main benefit is being able to control which versions are used and proper module isolation. For example you can. For me the best part of OSGi is that it promotes a service-oriented view of your system, which helps decoupling, testing and teamwork. I don't think it has to be complex, as I tried to demonstrate with my "OSGi for mere mortals" example application [1] and slides [2] both shameless plugs ;-.

Go through with this tutorial thoroughly. You might get your answer. OSGi is a fast framework because it knows that which service will be loaded into OSGi environment thanks to pre-defined xml file. It reduces runtime cost thanks to lazy state. Service instance is created when they needed. Some bundle's different version can be used by other bundle at the same time. Since each plug-in has it own class loader , any bundle can be stopped, started, installed or uninstalled without stopping Java Virtual Machine.

The communication among the bundle is possible by using declarative service or service tracker in OSGi environment via interfaces. Using interface frequently pay the way for reusable code. Although OSGi framework contains quite a few class and interface, powerful projects can be created by using it. You might add editors for Java and JavaScript, an app server, and a database connector. Each of these is implemented as an OSGi bundle that is added to the container and can interact with other services in the container.

OSGi is a natural fit for this type of development, which has a variety of software components running side-by-side on devices, without necessarily knowing about each other.

An OSGi container provides a simple and standardized way to host these dynamic software components. Our example is based on the Knoplerfish OSGi runtime , which is used in many production deployments. The current version at the time of this writing is Knoplerfish OSGi 6. You can replace that version with whatever is most current when you read this article.

Before we move into the example, take a look at the set of running bundles. Sure enough, you will see a Knoplerfish web page. This bundle outputs a message to the console. In Listing 1, we use Maven to build the bundle. It has only one dependency, which is provided by the OSGi alliance. This plug-in takes care of packaging the app as an OSGi bundle for use.

Build the bundle by going to the command line and typing mvn clean install. This will output a JAR file containing the bundle. This will provide a file browser.

When you are ready to stop the bundle, you could click the Stop menu item.