spring-batch JobExecutionNotificationPublisher 源码
spring-batch JobExecutionNotificationPublisher 代码
文件路径：/spring-batch-samples/src/main/java/org/springframework/batch/sample/jmx/JobExecutionNotificationPublisher.java
/*
* Copyright 2006-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.sample.jmx;
import javax.management.Notification;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.jmx.export.notification.NotificationPublisher;
import org.springframework.jmx.export.notification.NotificationPublisherAware;
/**
* JMX notification broadcaster
*
* @author Dave Syer
* @since 1.0
*/
public class JobExecutionNotificationPublisher
implements ApplicationListener<SimpleMessageApplicationEvent>, NotificationPublisherAware {
private static final Log LOG = LogFactory.getLog(JobExecutionNotificationPublisher.class);
private NotificationPublisher notificationPublisher;
private int notificationCount = 0;
/**
* Injection setter.
*
* @see org.springframework.jmx.export.notification.NotificationPublisherAware#setNotificationPublisher(org.springframework.jmx.export.notification.NotificationPublisher)
*/
@Override
public void setNotificationPublisher(NotificationPublisher notificationPublisher) {
this.notificationPublisher = notificationPublisher;
}
/**
* If the event is a {@link SimpleMessageApplicationEvent} for open and close we log
* the event at INFO level and send a JMX notification if we are also an MBean.
*
* @see ApplicationListener#onApplicationEvent(ApplicationEvent)
*/
@Override
public void onApplicationEvent(SimpleMessageApplicationEvent applicationEvent) {
String message = applicationEvent.toString();
LOG.info(message);
publish(message);
}
/**
* Publish the provided message to an external listener if there is one.
* @param message the message to publish
*/
private void publish(String message) {
if (notificationPublisher != null) {
Notification notification = new Notification("JobExecutionApplicationEvent", this, notificationCount++,
message);
/*
* We can't create a notification with a null source, but we can set it to
* null after creation(!). We want it to be null so that Spring will replace
* it automatically with the ObjectName (in ModelMBeanNotificationPublisher).
*/
notification.setSource(null);
notificationPublisher.sendNotification(notification);
}
}
}
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