February 2004
Intermediate to advanced
848 pages
27h 25m
English
Content preview from WebLogic: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Monitor MBeans
To further enhance your control over the management of an application, JMX provides Monitor MBeans that allow you to observe attribute values as they vary over time and to fire notifications when these values exceed specific thresholds.
Monitor MBeans monitor attributes in other MBeans at specified intervals and derive a value from this observation called the derived gauge. The derived gauge is either the exact value of the attribute, or optionally the difference between two consecutive observed values of a numeric attribute. Depending on the Monitor MBean and its setup, it then can emit an MBean Notification. Monitors can also send notifications when error cases are encountered during monitoring.
Monitors are MBeans as well, and so can be created or destroyed dynamically. Typically, Monitor MBeans are used in combination with the statistics captured by the Runtime MBeans. For example, you could write an MBean to monitor the connection delay time of connections in a JDBC connection pool, or the number of messages dropped in a JMS destination. The Monitor MBean could then send a notification when certain thresholds are crossed. This gives you the opportunity to listen for those notifications and take some appropriate action.
Types of Monitors
There are three types of Monitor MBeans, each explained in depth in the JMX specification:
-
CounterMonitor This can observe Integer attributes that behave like a counter. That is, the attribute value is always greater than or equal ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.