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From Berin Loritsch <blorit...@apache.org>
Subject [C2.1] Making an installable Cocoon
Date Thu, 06 Sep 2001 20:35:09 GMT
I want to create an installable Cocoon for version 2.1.
We have already discussed its features a couple of months
ago.  The most important ones are the predictable classloaders,
the separation of implementation and interface, and smaller
webapps.

Currently, the Cocoon demonstration Web App weighs in at
an impressive 11MB.  By specifying an install directory,
Cocoon can be accessed by any webapp on a machine.  It does
not negate the ability to deploy like we normally do, it
simply provides another option.  Cocoon should also be
installable in a J2EE EAR file, and used from multiple
webapps there.

Most of the changes are straight-forward.  It will require
us to separate the Tools libraries into a separate directory
to facilitate automatic discovery of jars without grabbing the
wrong ones.

The one change that is not so straight forward is repartitioning
Cocoon into separate jars.  It is important to define what is
a user accessible API, and what is not.  For the important
interfaces, this is simple:

Generator, Transformer, Serializer, Reader, Matcher, Selector,
Action, and Processor should all be publicly exposed interfaces.
Below, I compiled an exaustive list of all the interfaces and
classes that should be in a cocoon-api.jar file.  Please let me
know if I missed something.

I will set up the packaging to generate the following jars:

cocoon.jar (main implementation and component implementations)
cocoon-api.jar (main interface and utility classes)
cocoon-servlet22.jar (environment implementations for servlet 2.2 spec)
cocoon-servlet23.jar (environment implementations for servlet 2.3 spec)
cocoon-cli.jar (environment implementations for the command line)

In the WEB-INF/libs directory, all you would need are:
cocoon-api.jar
avalon-framework.jar
avalon-excalibur.jar
cocoon-servlet22.jar (or cocoon-servlet23.jar)

All the rest of the jars will be able to rest in a separate lib directory
either inside or outside of the servlet context.  That allows us to have
a known classloader, and remove 90% of our installation problems.

The classes/packages I forsee in the Cocoon API jar are:

org.apache.cocoon.*Exception (all exception types)
org.apache.cocoon.Processor
org.apache.cocoon.CocoonManager (NEW CLASS)
org.apache.cocoon.Modifiable (NOTE: prefer the version in current Avalon)
org.apache.cocoon.components.language.generator.ProgramGenerator
org.apache.cocoon.components.language.generator.CompiledComponent
org.apache.cocoon.components.language.markup.MarkupLanguage
org.apache.cocoon.components.language.programming.ProgrammingLanguage
org.apache.cocoon.components.language.programming.CodeFormatter
org.apache.cocoon.components.language.LanguageException
org.apache.cocoon.components.browser.Browser
org.apache.cocoon.components.store.Store
org.apache.cocoon.components.store.StoreJanitor
org.apache.cocoon.components.sax.*
org.apache.cocoon.components.saxconnector.SAXConnector
org.apache.cocoon.components.source.SourceFactory
org.apache.cocoon.components.source.SourceHandler
org.apache.cocoon.components.parser.Parser
org.apache.cocoon.components.resolver.Resolver
org.apache.cocoon.components.url.URLFactory
org.apache.cocoon.components.xslt.XSLTProcessor
org.apache.cocoon.acting.Action
org.apache.cocoon.caching.* (all caching classes)
org.apache.cocoon.environment.* (but none of the sub packages)
org.apache.cocoon.generation.Generator
org.apache.cocoon.i18n.*
org.apache.cocoon.matching.Matcher
org.apache.cocoon.reading.Reader
org.apache.cocoon.selection.Selector
org.apache.cocoon.selection.Serializer
org.apache.cocoon.transformation.Transformer
org.apache.cocoon.util.*
org.apache.cocoon.xml.**  (all sub packages)

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