Experience in Extending Query Engine for Continuous Analytics

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05-22-2010

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Experience in Extending Query Engine for Continuous Analytics

HPL-2010-44 Experience in Extending Query Engine for Continuous Analytics - Chen, Qiming; Hsu, Meichun
Keyword(s): In-Database Stream Processing
Abstract: Combining data warehousing and stream processing technologies has great potential in offering low-latency data-intensive analytics. Unfortunately, such convergence has not been properly addressed so far. The current generation of stream processing systems is in general built separately from the data ...
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moosex::role::parameterized::extending

MooseX::Role::Parameterized::Extending(3)		User Contributed Perl Documentation		 MooseX::Role::Parameterized::Extending(3)

NAME

       MooseX::Role::Parameterized::Extending - extending MooseX::Role::Parameterized roles

DESCRIPTION

       There are heaps of useful modules in the "MooseX" namespace that you can use to make your roles more powerful. However, they do not always
       work out of the box with MooseX::Role::Parameterized, but it's fairly straight-forward to achieve the functionality you desire.

       MooseX::Role::Parameterized was designed to be as extensible as the rest of Moose, and as such it is possible to apply custom traits to
       both the parameterizable role or the ordinary roles they generate. In this example, we will look at applying the fake trait
       "MooseX::MagicRole" to a parameterizable role.

       First we need to define a new metaclass for our parameterizable role.

	   package MyApp::Meta::Role::Parameterizable;
	   use Moose;
	   extends 'MooseX::Role::Parameterized::Meta::Role::Parameterizable';
	   with 'MooseX::MagicRole';

       This is a class (observe that it uses Moose, not Moose::Role) which extends the class which governs parameterizable roles.
       MooseX::Role::Parameterized::Meta::Role::Parameterizable is the metaclass that packages using MooseX::Role::Parameterized receive by
       default.

       Note that the class we are extending, MooseX::Role::Parameterized::Meta::Role::Parameterizable, is entirely distinct from the similarly-
       named class which governs the ordinary roles that parameterized roles generate. An instance of
       MooseX::Role::Parameterized::Meta::Role::Parameterized represents a role with its parameters already bound.

       Now we can take advantage of our new subclass by specifying that we want to use "MyApp::Meta::Role::Parameterizable" as our metaclass when
       importing MooseX::Role::Parameterized:

	   package MyApp::Role;
	   use MooseX::Role::Parameterized -metaclass => 'MyApp::Meta::Role::Parameterizable';

	   role {
	       ...
	   }

       And there you go! "MyApp::Role" now has the "MooseX::MagicRole" trait applied.

perl v5.16.2							    2010-12-24				 MooseX::Role::Parameterized::Extending(3)

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