List of installed features or conditional bean

[b0ro]

Hello,
I'm trying to write an extension with some custom health checks. I'm using:

• https://quarkus.io/guides/smallrye-health and
• https://github.com/eclipse/microprofile-health/tree/main.

I want to enable my health checks if given extension or bean is present. In Spring I would use @ConditionalOnBean and @ConditionalOnProperty.

I know that quarkus has @IfBuildProperty but is there anything to check if given bean is present or if extension is loaded? It's a build time feature and quarkus always logs all installed features so the info is there. I just don't know how to access it programmatically in a extension.

[mschorsch]

@IfBuildProperty removes the bean at build time If the property ist not set. I think you are looking for @LookupIfProperty (https://quarkus.io/guides/cdi-reference#declaratively-choose-beans-that-can-be-obtained-by-programmatic-lookup).

You can iterate over all instances with Instance<Service>#stream().

[mschorsch]

You can check if an extension ist present with Extension Capabilities.

https://quarkus.io/guides/capabilities#querying-capabilities

    @BuildStep
    HealthBuildItem addHealthCheck(Capabilities capabilities, DataSourcesBuildTimeConfig dataSourcesBuildTimeConfig) {
        if (capabilities.isPresent(Capability.SMALLRYE_HEALTH)) {
            return new HealthBuildItem("io.quarkus.agroal.runtime.health.DataSourceHealthCheck",
                    dataSourcesBuildTimeConfig.healthEnabled);
        } else {
            return null;
        }
    }