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From "Paul McMahan (JIRA)" <j...@apache.org>
Subject [jira] Created: (GERONIMO-2757) Enhance plugin schema to allow for multiple versions of a plugin
Date Fri, 19 Jan 2007 18:19:30 GMT
Enhance plugin schema to allow for multiple versions of a plugin
----------------------------------------------------------------

                 Key: GERONIMO-2757
                 URL: https://issues.apache.org/jira/browse/GERONIMO-2757
             Project: Geronimo
          Issue Type: Improvement
      Security Level: public (Regular issues)
          Components: Plugins
    Affects Versions: 2.0
            Reporter: Paul McMahan


plugins-1.1.xsd currently allows for a single version of a plugin to be described from within
a <plugin> element.   For example, if there were a different version of plugin for each
version of geronimo then the plugin catalog would like something like:

<plugin>
    <module-id>org.apache.geronimo.configs/ca-helper-tomcat/1.1/car</module-id>
    <geronimo-version>1.1</geronimo-version>
    <source-repository>http://geronimo.apache.org/plugins/geronimo-1.1</source-repository>
    [...]
</plugin>
<plugin>
    <module-id>org.apache.geronimo.configs/ca-helper-tomcat/1.2/car</module-id>
    <geronimo-version>1.2</geronimo-version>
    <source-repository>http://geronimo.apache.org/plugins/geronimo-1.2</source-repository>
    [...]
</plugin>
<plugin>
    <module-id>org.apache.geronimo.configs/ca-helper-tomcat/2.0/car</module-id>
    <geronimo-version>2.0</geronimo-version>
    <source-repository>http://geronimo.apache.org/plugins/geronimo-2.0</source-repository>
    [...]
</plugin>
<default-repository>http://geronimo.apache.org/plugins/geronimo-1.1</default-repository>
<default-repository>http://geronimo.apache.org/plugins/geronimo-1.2</default-repository>
<default-repository>http://geronimo.apache.org/plugins/geronimo-2.0</default-repository>

Plugins are usually not compatible across versions of Geronimo for various reasons, probably
the most prominent of which is Geronimo's reliance on serialized java objects in CAR files.
 Browsing a catalog that contains a <plugin> element for each version of Geronimo's
plugins from the  admin console or from the CLI  would be confusing because of the many (seemingly
redundant) entries.  Therefore the collection of Geronimo plugins is distributed across a
set of catalogs, one per version of Geronimo, and each version of Geronimo points at a version
specific plugin catalog.

Modifying the plugin schema so that a <plugin> element can allow the plugin's module-id
and source-repository to depend on the <geronimo-version> would allow there to be much
fewer entries in a consolidated plugin catalog.  A plugin catalog that is created using this
modified schema might look something like (this is just a sample) :

<plugin>
    <geronimo-version version="1.1">
        <module-id>org.apache.geronimo.configs/ca-helper-tomcat/1.1/car</module-id>
        <source-repository>http://geronimo.apache.org/plugins/geronimo-1.1</source-repository>
    </geronimo-version>
    <geronimo-version version="1.2">
        <module-id>org.apache.geronimo.configs/ca-helper-tomcat/1.2/car</module-id>
        <source-repository>http://geronimo.apache.org/plugins/geronimo-1.2</source-repository>
    </geronimo-version>
    <geronimo-version version="2.0">
        <module-id>org.apache.geronimo.configs/ca-helper-tomcat/2.0/car</module-id>
        <source-repository>http://geronimo.apache.org/plugins/geronimo-2.0</source-repository>
    </geronimo-version>
    [...]
</plugin>

Also, for this to work a customized list of <prerequisite> elements would probably have
to be supported inside the <geronimo-version> element as well, since those might also
be version specific.

Once this improvement is in place it will be easier to maintain Geronimo's plugin collection
since each version of Geronimo won't require a separate catalog.  Also it will be easier for
end users and other external sources to refer to Geronimo's plugin catalog since the repository
URL will no longer be version specific.

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