Vyacheslav Koptilin created IGNITE-14410:
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Summary: Node components startup
Key: IGNITE-14410
URL: https://issues.apache.org/jira/browse/IGNITE-14410
Project: Ignite
Issue Type: New Feature
Reporter: Vyacheslav Koptilin
Need to define requirements/rules that should define components lifecycle and
theirs mutual interaction.
For testability purposes, we require that component dependencies are defined
upfront and provided at the construction time. This additionaly requires that
component dependencies form no cycles. Therefore, components form an acyclic
directed graph that is constructed in topological sort order wrt root.
Components created and initialized also in an order consistent with a
topological sort of the components graph. This enforces serveral rules related
to the components interaction:
- Since metastorage watches can only be added during the component startup,
the watch notification order is consistent with the component initialization
order. I.e. if a component B depdends on a component A, then A receives watch
notification prior to B.
- Dependent component can directly call an API method on a dependee component
(because it can obtain the dependee reference during construction). Direct
inverse calls are prohibited (this is enforced by only acquiring component
references during the components construction). Nevertheless, inverse call can
be implemented by means of listeners or callbacks: the dependent component
installs a listener to a dependeee, which can be later invoked.
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