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From "Ate Douma (JIRA)" <jetspeed-...@portals.apache.org>
Subject [jira] Resolved: (JS2-938) Create flyweight PortletWindow instances for each request, the handle to access and store all portlet interaction data and drop the PortletEntityImpl usage
Date Thu, 16 Apr 2009 14:10:17 GMT

     [ https://issues.apache.org/jira/browse/JS2-938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ate Douma resolved JS2-938.
---------------------------

    Resolution: Fixed

The task remaining was providing a new solution for the previously used PortletWindowCache,
specifically with respect to caching PortletDefinitions
This now is implemented by leveraging the OJB cache itself (backed by a ehcache) as a shared/global
(readonly) cache, both for PortletApplication and PortletDefinition instances.

As instances retrieved through this cache are shared, they should only be used for readonly
purposes, like as for the PortletWindow.
To distinguish between the readonly and writing use-cases, I've added additional registry
methods for retrieving a PortletApplication or PortletDefinition with a extra boolean parameter
fromCache.
This way, current API usages will still (like before) retrieve fresh instances directly from
the database, but with these new methods the much more optimal cache based retrieval is now
possible.
For common usages, like the flyweight PortletWindows but also simple read checks I've already
updated the current API usages where applicable.
Possibly other usages might be reviewed if they also could leverage the more optimal cache
based retrieval methods.

> Create flyweight PortletWindow instances for each request, the handle to access and store
all portlet interaction data and drop the PortletEntityImpl usage 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JS2-938
>                 URL: https://issues.apache.org/jira/browse/JS2-938
>             Project: Jetspeed 2
>          Issue Type: Improvement
>          Components: Components Core, Container, Portlet Entities and Preferences
>    Affects Versions: 2.2.0
>            Reporter: Ate Douma
>            Assignee: Ate Douma
>            Priority: Critical
>             Fix For: 2.2.0
>
>
> With the new Pluto container API and the upgrade process to integrate it in Jetspeed,
see: JS2-871, it has become clear that we now can improve and simplify the portlet request
state management enormously.
> By now managing the request state separate from the request/response (wrapper) objects,
we can almost completely get rid of all potential concurrency problems and drop all the specialized
code dealing with that.
> This requires some extensive refactoring but will in the end make the logic and management
of the portlet invocations and renderjobs much more straightforward.
> The following steps are planned to implement this:  
> - No more caching of PortletWindow instances:
>       For each request and for each "fragment" a new  PortletWindow will be created on
the fly
> - Replace the portletWindowCache with a PortletDefinitionCache
>       In the current PortletWindow object model tree, the real model data is primarily
the PortletDefinition itself and the cache is foremost used for quick access to that  
>      The PortletEntity referenced from the PortletWindow only provides access to the
PortletDefinition and its logical ID value which is (currently) equal to the window id
> - Extend PortletWindow to provide access to and store all (and only) the PortletWindow
specific state:
>      - PortletDefinition
>      - ContentFragment (and thereby also PortletContent)
>      - (request) attributes map
>     - implement also the Pluto PortletEntity interface (which only provides access to
PortletDefinition) and have it point back to window.getPortletDefinition()
> - When a PortletWindow is created (or better: when its related Fragment is determined)
the fragment will provide the key (name==appName::portletName) into the portletDefinitionCache
to retrieve its PortletDefinition
> - Create a PortletWindow factory on the JetspeedRequestContext which keeps a map of current
request PortletWindows keyed on windowId
> - Store the currently invoked PortletWindow in a single (non-static) ThreadLocal on the
JetspeedRequestContext to support the container interaction and callback access from dispatched
portlets
> - Merge the current PortletWindowRequestContext interface also into PortletWindow to
support the container invocation process
>   Pluto container passes the PortletWindow around everywhere, so Jetspeed also will have
direct access to the request/response state anywhere we're called back, without even having
to go through the ThreadLocal to access it
> The resulting new PortletWindow is completely thread save and thus all the current code
needed to keep the request state in sync can be dropped. 
> Finally, by merging the PortletEntity with the PortletWindow we technically no longer
need the PortletEntityImpl itself.
> The PortletEntity (ID) used to needed for preferences lookup because a PortletEntity
really is just that: a handle to a preferences set.
> With the already completed refactoring of the portlet preferences however we already
are actually storing the PortletEntity ID directly with the preferences (set) itself in the
database.
> Because of that, the PortletEntity object and database table actually have become redundant
now, except for the current usage and reference from the PortletWindow.
> The end result of all this therefore is expected to allow us to drop the PortletEntityImpl
and everything tied to it from Jetspeed.
> Note: the *logical* meaning and usage of a PortletEntity (ID) will remain of course.

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