Federico Mariani created CAMEL-23252:
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Summary: Add onReload SPI method to ContextServicePlugin for
dev-mode hot-reload hooks
Key: CAMEL-23252
URL: https://issues.apache.org/jira/browse/CAMEL-23252
Project: Camel
Issue Type: New Feature
Affects Versions: 4.18.0
Reporter: Federico Mariani
Assignee: Federico Mariani
Third-party plugins that register beans during {{ContextServicePlugin.load()}}
have no way to refresh those beans when properties change in dev mode
({{--dev}}).
Camel's {{RouteWatcherReloadStrategy}} detects {{.properties}} file changes and
reloads routes, but third-party beans bound to the registry during {{load()}}
become stale. Components like {{SqlComponent}} cache bean references (e.g.,
DataSource) at the component level, so even endpoint registry clearing doesn't
help — the plugin needs a hook to refresh beans before routes are reloaded.
*Proposed change*:
Add a default {{onReload}} method to the {{ContextServicePlugin}} SPI:
{code:java}
public interface ContextServicePlugin {
void load(CamelContext camelContext);
default void unload(CamelContext camelContext) {}
/**
* Called before routes are reloaded during dev mode (hot-reload). * Plugins
can refresh beans/configuration so restarted routes
* pick up updated references.
*/
default void onReload(CamelContext camelContext) {}
}
{code}
{{RouteWatcherReloadStrategy}} would invoke {{onReload()}} on all registered
plugins before removing and re-adding routes in {{onRouteReload()}}.
Benefits:
- Deterministic ordering — same thread, no race conditions
- Backward compatible — default no-op
- Eliminates the need for third-party plugins to run their own file watchers
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