此处的用例是获取内容信息，其类型为cq：Page和dam：使用AEM中的包管理器在JCR中安装/更新的资产。
我想知道是否有任何可用于此目的的事件监听器或API。
有没有办法知道是否使用包管理器安装/更新了内容？
此处正在使用AEM 6.2。
谢谢！
答案 0 :(得分：2)
要检测资源更改，您需要创建ResourceChangeListener
以下是基于ACS公共SampleResourceChangeListener但仅限于<x> <y> <width> <height>和ADDED事件的示例。
CHANGED或者，你可以使用import org.apache.felix.scr.annotations.*;
import org.apache.sling.api.resource.observation.ExternalResourceChangeListener;
import org.apache.sling.api.resource.observation.ResourceChange;
import org.apache.sling.api.resource.observation.ResourceChangeListener;
import org.apache.sling.event.jobs.JobManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* The Sling Resource Change Listener is the preferred method for listening for Resource Change events in AEM.
* This is preferred over the Sling Resource Event Listener, or the JCR Event Handler approaches.
*
* ResourceChangeListener Javadoc:
* - https://docs.adobe.com/docs/en/aem/6-2/develop/ref/javadoc/org/apache/sling/api/resource/observation/ResourceChangeListener.html
*
* Note: To listen for External events, implements the ExternalResourceChangeListener. If ONLY local events are in scope, implement only the ResourceChangeListener.
*/
@Component(
label = "Sample - Resource Change Listener",
description = "A sample implementation of the Sling Resource Change Listener",
metatype = true
)
@Properties({
// Scope the paths as tightly as possible based on your use-case.
@Property(
label = "Paths",
description = "[ Required ] A list of resource paths this listener will listen for change events.",
name = ResourceChangeListener.PATHS,
value = {"/content"}
),
// Scope the types as tightly as possible based on your use-case.
// If This property is not provided, ALL ChangeTypes will be accepted.
// Available values are defined on: ResourceChange.ChangeType
@Property(
label = "Change Types",
description = "[ Optional ] The change event types this listener will listener for. ",
name = ResourceChangeListener.CHANGES,
value = {"ADDED", "CHANGED"}
)
})
@Service
public class SampleResourceChangeListener implements ResourceChangeListener, ExternalResourceChangeListener {
private static final Logger log = LoggerFactory.getLogger(SampleResourceChangeListener.class);
@Reference
private JobManager jobManager;
public void onChange(@Nonnull List<ResourceChange> changes) {
// Iterate over the ResourceChanges and process them
for (final ResourceChange change : changes) {
// Process each change quickly; Do not do long-running work in the Resource Change Listener.
// If expensive/long-running work is required to handle the event, create a Sling Job to perform that work.
if (change.isExternal()) {
// Since this implements BOTH the ResourceChangeListener AND ExternalResourceChangeListener
// we can conditionally handle local vs external events.
}
switch (change.getType()) {
case ADDED:
log.debug("Change Type ADDED: {}", change);
if (change.getAddedPropertyNames().contains("someProperty")) {
// Do some work
// In this case we will pass some some data from the Event to a custom job via a custom Job topic.
final Map<String, Object> props = new HashMap<String, Object>();
props.put("path", change.getPath());
props.put("userId", change.getUserId());
jobManager.addJob("com/adobe/acs/commons/samples/somePropertyAdded", props);
}
break;
case CHANGED:
log.debug("Change Type CHANGED: {}", change);
if (change.getChangedPropertyNames().contains("someOtherProperty")) {
// Do some other work
}
break;
default:
// Do nothing
}
}
}
}
，ACS在这里有一个很好的例子：SampleJcrEventListener.java
我不知道如何检测添加/更新的原因是否为包管理器。但是，如果要在安装软件包之前执行某些代码，可以使用InstallHook。我以前没试过这个。