Package org.apache.derby.mbeans
JMX MBeans.
When Derby (the embedded engine) is booted it will attempt to connect to the PlatformMBeanServer and register a number of MBeans to monitor and manage Derby.
Derby registers its JMX MBeans in the org.apache.derby
domain and
always includes values for type
and system
in the MBean's ObjectName's key
properties. Other key properties are described in the interface class for the MBean.
-
type
Set to the class name of the MBean's interface class without the package and withoutMBean
. E.g. fororg.apache.derby.mbeans.VersionMBean
the key propertytype
will be set toVersion
. The javadoc for each MBean also indicates whattype
will be set to. -
system
Set to a runtime identifier that allows Derby and applications to disambiguate multiple Derby systems in the same virtual machine but different class loaders. Currently a new value is created each time Derby is booted. An application may discover the value of the identifier by registering the MBeanorg.apache.derby.mbeans.Management
and accessing theSystemIdentifier
. This application createdManagementMBean
must be running in the same class loader as Derby.
Derby registers the class name for any MBean to be the interface class for the MBean
(i.e. org.apache.derby.mbeans.*MBean
) to hide the implementation class
(which is subject to change). Permissions in policy files therefore need to
use the MBean interface to define fine grained access. E.g. the permission
to allow a invoking the startManagement
of the ManagementMBean
may be written as:
permission javax.management.MBeanPermission "org.apache.derby.mbeans.ManagementMBean#startManagement[org.apache.derby:*]", "invoke";
If Derby cannot connect to the PlatformMBeanServer then no MBeans will be registered.
Applications may use the org.apache.derby.mbeans.Management
MBean to
later enable Derby's JMX management.
If Derby cannot register a specific MBean (e.g. due to no permission to register
that MBean) then it will simply be ignored. Subsequent re-starts of Derby's
management service through org.apache.derby.mbeans.ManagementMBean
will
attempt to register such an MBean again (assuming it is still valid),
in case the security policy has been updated.
-
ClassDescriptionThis is an MBean that provides information about one of Derby's cache managers.Management and information for the embedded JDBC driver.Management MBean to allow applications to dynamically control visibility of Derby's MBeans.JMX MBean inteface to control visibility of Derby's MBeans.This interface defines a Standard MBean for exposing the version information of a running Derby component.