AEM6.3-使用OSGi R6注释创建事件处理程序

Question

我通过遵循https://github.com/nateyolles/aem-osgi-annotation-demo/blob/master/core/src/main/java/com/nateyolles/aem/osgiannotationdemo/core/listeners/SampleOsgiResourceListener.java创建了一个事件处理程序，它运行得很好。然而，我得到警告“字段SlingConstants.TOPIC_RESOURCE_ADDED是不推荐的”。我搜索了一下，发现了这样一个帖子:https://forums.adobe.com/thread/2325819

以下是我所面临的挑战：

1)我想为我的事件处理程序创建一个单独的配置接口。我试过了，但不起作用

package com.aem.sites.interfaces;

import org.apache.sling.api.SlingConstants;
import org.osgi.service.event.EventConstants;
import org.osgi.service.metatype.annotations.AttributeDefinition;
import org.osgi.service.metatype.annotations.AttributeType;
import org.osgi.service.metatype.annotations.ObjectClassDefinition;

@ObjectClassDefinition(name = "Temperature Listener Configuration")
public @interface TemperatureListenerConfiguration {

    @AttributeDefinition(
            name = EventConstants.EVENT_FILTER,
            description = "Configurable paths for temperature event listener",
            type = AttributeType.STRING
            )
    String getPaths() default "/content/aemsite/en/jcr:content/root/responsivegrid/banner";

    @AttributeDefinition(
            name = EventConstants.EVENT_TOPIC,
            description = "Event types",
            type = AttributeType.STRING
            )
    String[] getEventTypes() default  {SlingConstants.TOPIC_RESOURCE_ADDED,SlingConstants.TOPIC_RESOURCE_CHANGED, SlingConstants.TOPIC_RESOURCE_REMOVED};

}

package com.aem.sites.listeners;

import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Modified;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
import org.osgi.service.metatype.annotations.Designate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.aem.sites.interfaces.TemperatureListenerConfiguration;

@Component(immediate=true,
service=EventHandler.class,
configurationPid = "com.aem.sites.listeners.EventHandler")
@Designate(ocd=TemperatureListenerConfiguration.class)
public class TemperaturePropertyListener implements EventHandler{

     private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void handleEvent(Event event) {
        logger.info("*********************Event handler*****************************");

    }

    @Activate
    @Modified
    public void activate(TemperatureListenerConfiguration config) {
        //config.getPaths();
        logger.info("**************************TemperaturePropertyListener******************activate**********************");
    }

}

我还想要SlingConstants废弃问题的解决方案。不确定ResourceChangeListener是否解决了我的问题，如果是，那么代码中的所有内容将如何协同工作。

提前感谢

===============================最新代码

package com.aem.sites.listeners;

import java.util.List;

import org.apache.sling.api.resource.observation.ResourceChange;
import org.apache.sling.api.resource.observation.ResourceChangeListener;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Modified;
import org.osgi.service.metatype.annotations.Designate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.aem.sites.interfaces.TemperatureListenerConfiguration;


@Component(immediate=true,
service=ResourceChangeListener.class,
configurationPid = "com.aem.sites.listeners.TemperaturePropertyListener")
@Designate(ocd=TemperatureListenerConfiguration.class)
public class TemperaturePropertyListener implements ResourceChangeListener{

     private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void onChange(List<ResourceChange> changes) {
        for (final ResourceChange change : changes) {
            logger.info("**************************TemperaturePropertyListener******************change type**********************"+change.getType());
        }

    }


    @Activate
    @Modified
    public void activate(TemperatureListenerConfiguration config) {
        //config.getPaths();
        logger.info("**************************TemperaturePropertyListener******************activate**********************");
    }
}

界面

package com.aem.sites.interfaces;

import org.apache.sling.api.resource.observation.ResourceChangeListener;
import org.osgi.service.metatype.annotations.AttributeDefinition;
import org.osgi.service.metatype.annotations.AttributeType;
import org.osgi.service.metatype.annotations.ObjectClassDefinition;

@ObjectClassDefinition(name = "Temperature Listener Configuration")
public @interface TemperatureListenerConfiguration {

    @AttributeDefinition(
            name = ResourceChangeListener.PATHS,
            description = "Configurable paths for temperature event listener",
            type = AttributeType.STRING
            )
    String[] getPaths() default {"/content/aemsite/en/jcr:content/root/responsivegrid/banner"};

    @AttributeDefinition(
            name = ResourceChangeListener.CHANGES,
            description = "Event types",
            type = AttributeType.STRING
            )
    String[] getEventTypes() default  {"ADDED","REMOVED","CHANGED","PROVIDER_ADDED", "PROVIDER_REMOVED"};

}

Answer 1

在sling 9文档中查看org.apache.sling.api.SlingConstants的Javadoc在这里：http://sling.apache.org/apidocs/sling9/org/apache/sling/api/SlingConstants.html

它明确地告诉您，不推荐使用TOPIC_RESOURCE_ADDED：

不赞成。注册一个ResourceChangeListener代替

此外，阅读ResourceChangeListener的文档，您还可以从ACS示例中查看样品SCR服务进展：

应该不难将其转换为R6声明性服务。

另外，下面是吊带项目ResourceBackedPojoChangeMonitor和OsgiObservationBridge的两个示例

尝试使用同一个类中的属性来模拟这些类。