OSGi配置作为ObjectClassDefinition对象

了解如何在OSGi服务中创建ObjectClassDefinitions并将其指定为OSGi配置表示。

资源

代码

ActivitiesImpl.java

/core/src/main/java/com/adobe/aem/wknd/examples/core/adventures/impl/ActivitiesImpl.java

package com.adobe.aem.wknd.examples.core.adventures.impl;

import java.util.Random;

import com.adobe.aem.wknd.examples.core.adventures.Activities;

import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.metatype.annotations.AttributeDefinition;
import org.osgi.service.metatype.annotations.Designate;
import org.osgi.service.metatype.annotations.ObjectClassDefinition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Component(
    service = { Activities.class }
)
@Designate(ocd = ActivitiesImpl.Config.class)
public class ActivitiesImpl implements Activities {
    private static final Logger log = LoggerFactory.getLogger(ActivitiesImpl.class);

    @ObjectClassDefinition(
        name = "WKND Examples - Activities Service",
        description = "OSGi Service providing information about WKND Adventures activities"
    )
    @interface Config {

        @AttributeDefinition(
            name = "WKND Activities",
            description = "Human-friendly list of activity names"
        )
        String[] activities() default { "Hiking", "Jogging", "Walking" };

        @AttributeDefinition(
            name = "Random Activity Seed",
            description = "Seed used to randomize activity selection"
        )
        int random_seed() default 10;

    }

    private String[] activities;

    private Random random;

    /**
     * @return the name of a random WKND adventure activity
     */
    public String getRandomActivity() {
        int randomIndex = random.nextInt(activities.length);
        return activities[randomIndex];
    }    

    @Activate
    protected void activate(Config config) {

        this.activities = config.activities();

        final int randomSeed = config.random_seed(); 
          
        this.random = new Random(randomSeed);

        log.info("Activated ActivitiesImpl with activities [ {} ]", String.join(", ", this.activities));
    }

    @Deactivate
    protected void deactivate() {
        log.info("ActivitiesImpl has been deactivated!");
    }
}

com.adobe.aem.wknd.examples.core.adventures.impl.ActivitiesImpl.cfg.json

/ui.config/src/main/content/jcr_root/apps/wknd-examples/osgiconfig/config/com.adobe.aem.wknd.examples.core.adventures.impl.ActivitiesImpl.cfg.json

{
    "random.seed:Integer":12,
    "activities":[
      "Skateboarding",
      "Mountain Biking"
    ]
}

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