# perldoc > POE::Resource

## NAME
    [POE::Resource](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource/markdown) - internal resource managers for [POE::Kernel](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AKernel/markdown)

## SYNOPSIS
    Varies, although most [POE::Resource](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource/markdown) subclasses do not have public APIs.

## DESCRIPTION
    POE manages several types of information internally. Its Resource classes are mix-ins designed
    to manage those types of information behind tidy, mostly private interfaces. This was done to
    facilitate testing and a conversion to C without the need to port [POE::Kernel](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AKernel/markdown) all at once.

    [POE::Resource](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource/markdown) subclasses are generally different from one another, but there are some
    similarities to note.

    Every resource should have an initializer and finalizer method. Initializers set up initial data
    and link resources into [POE::Kernel](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AKernel/markdown). Finalizers clean up any remaining data and verify that each
    resource subsystem was left in a consistent state.

    One common theme in resource implementations is that they don't need to perform much error
    checking, if any. Resource methods are used internally by [POE::Kernel](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AKernel/markdown) and/or [POE::API](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AAPI/markdown) classes,
    so it's up to them to ensure correct usage.

    Resource methods follow the naming convention _data_???_activity, where ??? is an abbreviation
    for the type of resource it belongs to:

      [POE::Resource::Events](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AEvents/markdown)      _data_ev_initialize
      [POE::Resource::FileHandles](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AFileHandles/markdown) _data_handle_initialize
      [POE::Resource::Signals](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3ASignals/markdown)     _data_sig_initialize

    Finalizer methods end in "_finalize".

      _data_ev_finalize
      _data_handle_finalize
      _data_sig_finalize

    Finalizers return true if a resource shut down cleanly, or false if there were inconsistencies
    or leaks during end-of-run checking. The t/res/*.t tests rely on these return values.

## SEE ALSO
    [POE::Resource::Aliases](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AAliases/markdown), [POE::Resource::Events](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AEvents/markdown), [POE::Resource::Extrefs](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AExtrefs/markdown),
    [POE::Resource::FileHandles](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3AFileHandles/markdown), [POE::Resource::SIDs](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3ASIDs/markdown), [POE::Resource::Sessions](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3ASessions/markdown), [POE::Resource::Signals](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AResource%3A%3ASignals/markdown)

    Also see "Resources" in [POE::Kernel](https://www.chedong.com/phpMan.php/perldoc/POE%3A%3AKernel/markdown) for public information about POE resources.

## BUGS
    None known.

AUTHORS & LICENSING
    Please see POE for more information about its authors, contributors, and licensing.