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From conflue...@apache.org
Subject [CONF] Apache Tuscany: OSGi Aware Programming in Tuscany (page created)
Date Tue, 11 Nov 2008 22:56:00 GMT
OSGi Aware Programming in Tuscany (TUSCANY) created by Luciano Resende
   http://cwiki.apache.org/confluence/display/TUSCANY/OSGi+Aware+Programming+in+Tuscany

Content:
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h4.Motivation for OSGi

   The Apache Tuscany project has become a large project, with various extensions and component
types that brings to the SCA Runtime different levels of dependencies. With its growth, Tuscany
also started to have it's SPIs violated by some of these extensions, and some of the boundaries
between sub-systems are broken, as there wasn't any enforcement of these boundaries.

   The OSGi model provides a very powerful and flexible framework to develop applications
in a modular fashion with a high degree of control over classloading inter-dependencies over
modules. An OSGi module (a.k.a bundle) have a manifest file (META-INF\manifest.mf) that contains
module information such as "name", "version" and also a list of what packages are being exported,
and what packages are being imported from the given bundle, providing ways to easily enforce
module boundaries.

h4.Tuscany and OSGi - 3rd party dependencies

   Currently we are wrapping the 3rd party dependencies as OSGi bundles, but leaving it unpacked
(a.k.a folder structure)



h4.Tuscany and OSGi - Granularity

   The granularity used to define modules should be very familiar to all tuscany developers,


   Tuscany Modules      --> OSGi Modules
   3rd Party Libraries  --> OSGi Modules (using unpacked wrap style bundle)

h4.Defining a OSGi bundle


{code}
Manifest-Version: 1.0
Export-Package: org.apache.tuscany.sca.assembly;uses:="javax.xml.xpath
 ,org.apache.tuscany.sca.assembly.impl,org.apache.tuscany.sca.policy,o
 rg.apache.tuscany.sca.interfacedef,javax.xml.namespace";version="1.4"
 ,org.apache.tuscany.sca.assembly.impl;uses:="javax.xml.xpath,org.apac
 he.tuscany.sca.assembly,org.apache.tuscany.sca.policy,org.apache.tusc
 any.sca.interfacedef,javax.xml.namespace";version="1.4",org.apache.tu
 scany.sca.assembly.builder;uses:="org.apache.tuscany.sca.assembly,org
 .apache.tuscany.sca.definitions,org.apache.tuscany.sca.core,org.apach
 e.tuscany.sca.monitor,org.apache.tuscany.sca.interfacedef,org.apache.
 tuscany.sca.extensibility";version="1.4"
Private-Package: org.apache.tuscany.sca.assembly.builder.impl;version=
 "1.4"
Tool: Bnd-0.0.255
Bundle-Name: Apache Tuscany SCA Assembly Model
Created-By: 1.6.0_07 (Sun Microsystems Inc.)
Bundle-Vendor: The Apache Software Foundation
Bundle-Version: 1.4
Bnd-LastModified: 1225397097203
Bundle-ManifestVersion: 2
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-Description: Apache Tuscany SCA Assembly Model
Import-Package: javax.xml.namespace,javax.xml.parsers,javax.xml.transf
 orm,javax.xml.transform.dom,javax.xml.transform.sax,javax.xml.xpath,o
 rg.apache.tuscany.sca.assembly;version="1.4",org.apache.tuscany.sca.a
 ssembly.builder;version="1.4",org.apache.tuscany.sca.assembly.impl;ve
 rsion="1.4",org.apache.tuscany.sca.core;version="1.4",org.apache.tusc
 any.sca.definitions;version="1.4",org.apache.tuscany.sca.extensibilit
 y;version="1.4",org.apache.tuscany.sca.interfacedef;version="1.4",org
 .apache.tuscany.sca.monitor;version="1.4",org.apache.tuscany.sca.poli
 cy;version="1.4",org.apache.tuscany.sca.policy.util;version="1.4",org
 .w3c.dom,org.xml.sax,junit.framework;resolution:=optional,org.apache.
 tuscany.sca.interfacedef.impl;version="1.4";resolution:=optional,org.
 junit;resolution:=optional
Bundle-SymbolicName: org.apache.tuscany.sca.assembly
Bundle-DocURL: http://www.apache.org/
{code}




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