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.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
Introduction to Policy-Distribution
***********************************
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The main job of policy distribution component is to receive
incoming notifications, download artifacts, decode policies
from downloaded artifacts & forward the decoded policies to
all configured policy engines.
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.. container:: paragraph
The current implementation of distribution component comes
with built-in SDC reception handler for receiving incoming
distribution notifications from SDC using SDC client library.
Upon receiving the notification, the corresponding CSAR artifacts
are downloaded using SDC client library.The downloaded CSAR is
then given to the configured policy decoder for decoding and
generating policies. The generated policies are then forwarded
to all configured policy engines. Related distribution status
is sent to SDC at each step (download/deploy/done) during the
entire flow.
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The distribution component also comes with built-in REST based
endpoints for fetching health check status & statistical data
of running distribution system.
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The distribution component is designed using plugin based architecture.
All the handlers, decoders & forwarders are basically plugins to
the running distribution engine. The plugins are configured in the
configuration JSON file provided during startup of distribution engine.
Adding a new plugin is simply implementing the related interfaces,
adding them to the configuration JSON file & making the classes available
in the classpath while starting distribution engine. There is no need
to edit anything in the distribution core engine.
Refer to distribution user manual for more details about the system and
the configuration.
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