为卸载创建和使用作业 creating-and-consuming-jobs-for-offloading
Apache Sling Discovery功能提供了一个Java API，允许您创建使用JobManager作业和JobConsumer服务的Java API。
有关创建卸载拓扑和配置主题使用情况的信息，请参阅 卸载作业.
处理作业负载 handling-job-payloads
卸载框架定义了两个用于标识作业负载的作业属性。 卸载的复制代理使用这些属性来标识要复制到拓扑中实例的资源：
offloading.job.input.payload:以逗号分隔的内容路径列表。 内容会复制到执行该作业的实例。offloading.job.output.payload:以逗号分隔的内容路径列表。 作业执行完成后，作业有效负载将复制到创建作业的实例上的这些路径。
使用 OffloadingJobProperties 引用属性名称的枚举：
OffloadingJobProperties.INPUT_PAYLOAD.propertyName()OffloadingJobProperties.OUTPUT_PAYLOAD.propetyName()
作业不需要负载。 但是，如果作业需要处理资源并且作业卸载到未创建作业的计算机，则有效负载是必需的。
为卸载创建作业 creating-jobs-for-offloading
创建调用JobManager.addJob方法的客户端，以创建由自动选择的JobConsumer执行的作业。 提供以下信息以创建作业：
- 主题：作业主题。
- 名称：（可选）
- 属性映射：A
Map<String, Object>包含任意数量属性的对象，例如输入有效负载路径和输出有效负载路径。 此映射对象可用于执行该作业的JobConsumer对象。
以下示例服务为给定主题和输入有效负载路径创建作业。
package com.adobe.example.offloading;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.apache.felix.scr.annotations.Reference;
import java.util.HashMap;
import org.apache.sling.event.jobs.Job;
import org.apache.sling.event.jobs.JobManager;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.apache.sling.api.resource.ResourceResolver;
import com.adobe.granite.offloading.api.OffloadingJobProperties;
@Component
@Service
public class JobGeneratorImpl implements JobGenerator {
@Reference
private JobManager jobManager;
@Reference ResourceResolverFactory resolverFactory;
public String createJob(String topic, String payload) throws Exception {
Job offloadingJob;
ResourceResolver resolver = resolverFactory.getResourceResolver(null);
if(resolver.getResource(payload)!=null){
HashMap<String, Object> jobprops = new HashMap<String, Object>();
jobprops.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), payload);
offloadingJob = jobManager.addJob(topic, null, jobprops);
} else {
throw new Exception("Payload for job cannot be found");
}
if (offloadingJob == null){
throw new Exception ("Offloading job could not be created");
}
return offloadingJob.getId();
}
}
在为 com/adobe/example/offloading 主题和 /content/geometrixx/de/services 有效负载：
10.06.2013 15:43:33.868 *INFO* [JobHandler: /etc/workflow/instances/2013-06-10/model_1554418768647484:/content/geometrixx/en/company] com.adobe.example.offloading.JobGeneratorImpl Received request to make job for topic com/adobe/example/offloading and payload /content/geometrixx/de/services
发展就业消费者 developing-a-job-consumer
要使用作业，请开发一个实施 org.apache.sling.event.jobs.consumer.JobConsumer 界面。 使用识别要使用的主题 JobConsumer.PROPERTY_TOPICS 属性。
以下示例JobConsumer实施在 com/adobe/example/offloading 主题。 用户只需将有效负载内容节点的Unsed属性设置为true即可。
package com.adobe.example.offloading;
import org.apache.felix.scr.annotations.Component;
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.ResourceResolver;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.apache.sling.event.jobs.Job;
import org.apache.sling.event.jobs.JobManager;
import org.apache.sling.event.jobs.consumer.JobConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.Session;
import javax.jcr.Node;
import com.adobe.granite.offloading.api.OffloadingJobProperties;
@Component
@Service
public class MyJobConsumer implements JobConsumer {
public static final String TOPIC = "com/adobe/example/offloading";
@Property(value = TOPIC)
static final String myTopic = JobConsumer.PROPERTY_TOPICS;
@Reference
private ResourceResolverFactory resolverFactory;
@Reference
private JobManager jobManager;
private final Logger log = LoggerFactory.getLogger(getClass());
public JobResult process(Job job) {
JobResult result = JobResult.FAILED;
String topic = job.getTopic();
log.info("Consuming job of topic: {}", topic);
String payloadIn = (String) job.getProperty(OffloadingJobProperties.INPUT_PAYLOAD.propertyName());
String payloadOut = (String) job.getProperty(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName());
log.info("Job has Input Payload {} and Output Payload {}",payloadIn, payloadOut);
ResourceResolver resolver = null;
try {
resolver = resolverFactory.getAdministrativeResourceResolver(null);
Session session = resolver.adaptTo(Session.class);
Node inNode = session.getNode(payloadIn);
inNode.getNode(Node.JCR_CONTENT).setProperty("consumed",true);
result = JobResult.OK;
}catch (Exception e){
log.info("ERROR -- JOB RESULT IS FAILURE " + e.getMessage());
result = JobResult.FAILED;
}
log.info("Job OK for payload {}",payloadIn);
return result;
}
}
MyJobConsumer类为/content/geometrixx/de/services的输入负载生成以下日志消息：
10.06.2013 16:02:40.803 *INFO* [pool-7-thread-17-<main queue>(com/adobe/example/offloading)] com.adobe.example.offloading.MyJobConsumer Consuming job of topic: com/adobe/example/offloading
10.06.2013 16:02:40.803 *INFO* [pool-7-thread-17-<main queue>(com/adobe/example/offloading)] com.adobe.example.offloading.MyJobConsumer Job has Input Payload /content/geometrixx/de/services and Output Payload /content/geometrixx/de/services
10.06.2013 16:02:40.884 *INFO* [pool-7-thread-17-<main queue>(com/adobe/example/offloading)] com.adobe.example.offloading.MyJobConsumer Job OK for payload /content/geometrixx/de/services
使用CRXDE Lite可以观察使用的属性：
Maven依赖项 maven-dependencies
将以下依赖关系维护添加到pom.xml文件，以便Maven能够解析与卸载相关的类。
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.event</artifactId>
<version>3.1.5-R1485539</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.adobe.granite</groupId>
<artifactId>com.adobe.granite.offloading.core</artifactId>
<version>1.0.4</version>
<scope>provided</scope>
</dependency>
以前的示例还需要以下依赖关系定义：
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.api</artifactId>
<version>2.4.3-R1488084</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.jcr.jcr-wrapper</artifactId>
<version>2.0.0</version>
<scope>provided</scope>
</dependency>
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