Question

我想获取CQ 561中特定节点的更改列表。此外，我还需要更改列表中的先前值和修改后的值。

Answer 1

AFAIK没有编码就无法获得该功能您可以使用 javax.jcr.observation.ObservationManager 来观察JCR节点及其属性创建一个JCR EventListener 并在ObservationManager中注册它，可以从JCR会话中重新获取。有关详细信息，请参阅example 但 javax.jcr.observation.Event 不包含以前的值，因此您必须自己组织此逻辑。

package com.adobe.aem.events;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;

import org.osgi.framework.BundleContext;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Arrays;

import javax.jcr.Node;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.observation.Event;
import javax.jcr.observation.EventIterator;
import javax.jcr.observation.EventListener;
import javax.jcr.observation.ObservationManager;
import org.apache.sling.jcr.api.SlingRepository;
import org.osgi.service.component.ComponentContext;

import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;

import org.apache.sling.api.resource.ResourceResolverFactory ; 
import org.apache.sling.api.resource.ResourceResolver; 
import org.apache.sling.api.resource.Resource; 

import java.text.SimpleDateFormat;
import java.util.Calendar;

/**
 * Just a simple DS Component
 */
@Component(metatype=true)
@Service
public class SimpleDSComponent implements Runnable,EventListener {

    private Logger log = LoggerFactory.getLogger(this.getClass());

    private BundleContext bundleContext;

    //Inject a Sling ResourceResolverFactory
    @Reference
    private ResourceResolverFactory resolverFactory;

    private Session session;

    private ObservationManager observationManager;

    //Inject a Sling ResourceResolverFactory to create a Session requited by the EventHandler
    @Reference
    private SlingRepository repository;

    public void run() {
        log.info("Running...");
    }


    //Place app logic here to define the AEM Custom Event Handler
    protected void activate(ComponentContext ctx) {
        this.bundleContext = ctx.getBundleContext();
        try
        {

            //Invoke the adaptTo method to create a Session 
             ResourceResolver resourceResolver = resolverFactory.getAdministrativeResourceResolver(null);
             session = resourceResolver.adaptTo(Session.class);

            // Setup the event handler to respond to a new claim under content/claim.... 
                observationManager = session.getWorkspace().getObservationManager();
                 final String[] types = { "nt:unstructured","sling:Folder" };
                 final String path = "/content/claim"; // define the path
                 observationManager.addEventListener(this, Event.NODE_ADDED, path, true, null, types, false);
                 log.info("Observing property changes to {} nodes under {}", Arrays.asList(types), path);

        }
        catch(Exception e) {
            e.printStackTrace(); 
        }
    }

    protected void deactivate(ComponentContext componentContext) throws RepositoryException {
        if(observationManager != null) {
            observationManager.removeEventListener(this);
        }
        if (session != null) {
            session.logout();
            session = null;
        }
    }

    //Define app logic that is fired when the event occurs - simply track the time 
    //when the event occurred. 
    public void onEvent(EventIterator itr) {
        Calendar cal = Calendar.getInstance();
        //log the time when the event occurred 
        log.info("A new node was added to content/claim at : " +cal.getTime());         
    }
}

另见Javadoc：

可以通过ObservationManager对象注册EventListener。异步通知事件侦听器，并在事件发生并提交事务后查看事件。事件侦听器仅查看为其注册的会话具有足够访问权限的事件。

审核Adobe CQ 561中的节点

1 个答案: