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When Dynamic MBeans?


Some practical Use Cases where Dynamic MBeans can be used are described below:

 Case 1 

Consider the case of managing a Web server. If role-based service has to be implemented, say for example, only the users having admin privileges can start or stop the server. A dynamic MBean can be written which contains an operation submitUserInfo taking two arguments, say username and password. If the username and the password match properly, then getMBeanInfo will return an MBeanInfo object exposing the operations startService and stopService. Otherwise, the admin operations will not be exposed.

 Case 2 

Consider the case of configuring a logger. It is obvious that the logger should not be active while configuring its properties. A dynamic MBean can be written which exposes the properties of the logger as read only attributes when the logger is running. It also exposes an operation to stop the logger. Once the logger is stopped, the attributes should be read write so that the properties can be configured. This type of scenario can easily be addressed by writing a dynamic MBean. A sample dynamic MBean is also provided in the examples section.

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