[jira] [Updated] (IGNITE-15409) Configuration registry: register listener with any placeholder on NamedConfigurationTree

["Ivan Bessonov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-15409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Bessonov updated IGNITE-15409:
-----------------------------------
    Labels: iep-55 ignite-3  (was: ignite-3)

> Configuration registry: register listener with any placeholder on NamedConfigurationTree
> ----------------------------------------------------------------------------------------
>
>                 Key: IGNITE-15409
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15409
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Alexander Lapin
>            Assignee: Ivan Bessonov
>            Priority: Major
>              Labels: iep-55, ignite-3
>
> Ability to add listeners with "any()" placeholder will ease the logic of registering ones.
> Let's say that we want to listen to a changes of a column type within any column of any table. Now the only option is to register type listeners from within column listeners within table listeners: 
> {code:java}
> clusterCfgMgr.configurationRegistry().getConfiguration(TablesConfiguration.KEY).tables().listenElements(
>     new ConfigurationNamedListListener<TableView>() {
>     @Override
>     public @NotNull CompletableFuture<?> onCreate(@NotNull ConfigurationNotificationEvent<TableView> tblCtx) {
>         clusterCfgMgr.configurationRegistry().getConfiguration(TablesConfiguration.KEY).tables().
>             get(tblCtx.newValue().name()).columns().listenElements(
>                 new ConfigurationNamedListListener<ColumnView>() {
>             @Override public @NotNull CompletableFuture<?> onCreate(
>                 @NotNull ConfigurationNotificationEvent<ColumnView> columnCtx) {
>                 clusterCfgMgr.configurationRegistry().getConfiguration(TablesConfiguration.KEY).tables().
>                     get(tblCtx.newValue().name()).columns().get(columnCtx.newValue().name()).listen((typeCtx) -> null);
>                 return CompletableFuture.completedFuture(null);
>             }
>         });
>         return CompletableFuture.completedFuture(null);
>     }
> {code}
> With any placeholder it will look like much simpler:
> {code:java}
> clusterCfgMgr.configurationRegistry().getConfiguration(TablesConfiguration.KEY).tables().any().columns().
>     any().type().listen(ctx -> null);
> {code}
> Besides obvious there are at least two important points here:
>  * It should be possible to retrieve full context/"full configuration locator" from the listener's context. In this particular case, _type().listen(ctx -> null)_ should provide context of the table and the column that were changed.
>  * It should be possible to remove such "any" listeners.



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