39 lines
1.5 KiB
ReStructuredText
39 lines
1.5 KiB
ReStructuredText
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Architecture
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============
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:term:`Providers<provider>` are similar to a "plugin" concept in that
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multiple providers may be installed by different
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:term:`packages<package>`. But whereas plugins are typically limited
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to a particular interface (method list/signatures etc.) a provider can
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also "bolt on" entirely new methods which may be used elsewhere in the
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:term:`app`.
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In that sense providers can perhaps be more accurately thought of as
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"extensions" rather than plugins.
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Providers may be related to :term:`handlers<handler>` in some cases,
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but not all. But whereas there is only *one handler* configured for a
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given portion of the app, multiple providers of the same type would
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*all contribute* to the overall app. In other words they are always
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enabled if installed. (Some may require a :term:`config setting` to
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be "active" - but that is up to each provider.)
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There can be many "types" of providers; each pertains to a certain
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aspect of the overall app. A given type of provider will apply to a
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certain "parent" class.
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What a Provider Does
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--------------------
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Each type of provider pertains to a certain parent class. The app
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itself will define the need for a provider type.
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For instance there might be a "dashboard" class which can show various
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blocks of info (charts etc.). Providers might be used to supplement the
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parent dashboard class, by adding extra blocks to the display.
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But in that example, providers look an awful lot like plugins.
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For a better (and real) example see :doc:`app`.
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