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Chapter 28. Monitoring
28.1. Monitoring
28.2. About Java Management Extensions (JMX)
28.2.1. About Java Management Extensions (JMX)
Java Management Extension (JMX) is a Java based technology that provides tools to manage and monitor applications, devices, system objects, and service oriented networks. Each of these objects is managed, and monitored by MBeans.
JMX is the de facto standard for middleware management and administration. As a result, JMX is used in Red Hat JBoss Data Grid to expose management and statistical information.
28.2.2. Using JMX with Red Hat JBoss Data Grid
Management in Red Hat JBoss Data Grid instances aims to expose as much relevant statistical information as possible. This information allows administrators to view the state of each instance. While a single installation can comprise of tens or hundreds of such instances, it is essential to expose and present the statistical information for each of them in a clear and concise manner.
In JBoss Data Grid, JMX is used in conjunction with JBoss Operations Network (JON) to expose this information and present it in an orderly and relevant manner to the administrator.
28.2.3. Enabling JMX for Cache Instances
You can enable JMX statistics at the Cache level either declaratively or programmatically.
Declaratively Enabling JMX at the Cache Level
Add the statistics attribute to the target <*-cache> element as follows:
<*-cache statistics="true">
Programmatically Enabling JMX at the Cache Level
Programmatically enable JMX at the cache level as follows:
Configuration configuration = new ConfigurationBuilder().jmxStatistics().enable().build();
28.2.4. Enabling JMX for CacheManagers
You can enable JMX statistics at the CacheManager level either declaratively or programmatically.
Declaratively Enabling JMX at the CacheManager Level
Add the statistics attribute to the <cache-container> element as follows:
<cache-container statistics="true">
Programmatically Enabling JMX at the CacheManager Level
Programmatically enable JMX at the CacheManager level as follows:
GlobalConfiguration globalConfiguration = new GlobalConfigurationBuilder().globalJmxStatistics().enable().build();
28.2.5. Multiple JMX Domains
Multiple JMX domains are used when multiple CacheManager instances exist on a single virtual machine, or if the names of cache instances in different CacheManagers clash.
To resolve this issue, name each CacheManager in manner that allows it to be easily identified and used by monitoring tools such as JMX and JBoss Operations Network.
Set a CacheManager Name Programmatically
Add the following code to set the CacheManager name programmatically:
GlobalConfiguration globalConfiguration = new
GlobalConfigurationBuilder().globalJmxStatistics().enable().
cacheManagerName("Hibernate2LC").build();28.2.6. Registering MBeans in Non-Default MBean Servers
The default location where all the MBeans used are registered is the standard JVM MBeanServer platform. Users can set up an alternative MBeanServer instance as well. Implement the MBeanServerLookup interface to ensure that the getMBeanServer() method returns the desired (non default) MBeanServer.
To set up a non default location to register your MBeans, create the implementation and then configure Red Hat JBoss Data Grid with the fully qualified name of the class. An example is as follows:
To Add the Fully Qualified Domain Name Programmatically
Add the following code:
GlobalConfiguration globalConfiguration = new
GlobalConfigurationBuilder().globalJmxStatistics().enable().
mBeanServerLookup("com.acme.MyMBeanServerLookup").build();28.3. StatisticsInfoMBean
The StatisticsInfoMBean MBean accesses the Statistics object as described in the previous section.
