OSGi and Apache Felix 3.0 Beginner's Guide by Walid Joseph Gedeon

By Walid Joseph Gedeon

This ebook is a step by step beginner's advisor in accordance with constructing a case research (a publication stock) that walks the developer during the implementation whereas gradually explaining the encompassing options in context. in the course of the booklet, the writer discusses software program layout thoughts and introduces productiveness instruments that increase the reader's knowledge-base. This ebook is aimed toward Java builders seeking to know about writing reusable and community distributable software program following the OSGi criteria utilizing the recognized Felix framework. while you are a developer who desires to specialise in the company common sense, and summary clear of the main points of ways to combine with particular structures then this publication is intended for you. when you are a Java developer new to OSGi and do not quite recognize the place to begin from to really start constructing functions, simply decide up this publication and become aware of the benefit with that you could commence constructing robust, modular, and extensible purposes. This publication makes use of the Felix framework 3.0 as an OSGi provider platform implementation and covers its utilization to a degree the place it makes you cozy adequate to jot down your personal enterprise-level purposes.

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Grep gogo line 1 line 2 gogo line 2 gogo line 3 ^Z true Notice that line 2 gogo is repeated right after you have entered it, showing that the grep statement is running in parallel. It receives the input and processes it right after you enter it. Variable assignment and referencing A session variable is assigned a value using the equal character ( = ) and referenced using its name preceded with a dollar character ( $ ). For example: g! var1 = 'this is a string' this is a string g! echo $var1 this is a string The assignment operation returns the assigned value.

For example, instead of executing: g! jar You would write: g! com g! jar [ 43 ] Felix Gogo update As newer versions of bundles are released, it is easy to update the installed bundle with a newer version by using the update command. The update command takes a bundle ID and an optional source URL as parameters. Its syntax is: g! help update update - update bundle scope: felix parameters: Bundle target bundle update - update bundle from URL scope: felix parameters: Bundle target bundle String URL from where to retrieve bundle For example: g!

Tier 2 Services (level 3), to which are assigned application business logic bundles; in our case, the Bookshelf Service bundle. Tier 1 Service Providers (level 4), to which are assigned bundles that provide user interaction services. For example, the Http Service (which we will look at in details in Chapter 11) is given the start level 4. Tier 1 Services (level 5), to which are assigned bundles that plug into user interface providers. For example, a bundle that implements the text UI commands (in Chapter 8, Adding a command-line interface) is assigned start level 5.

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