Naming Service

Naming Service is developed in accordance with JNDI 1.2 Specification to meet the naming system requirements of Java 2 Enterprise Edition (J2EE). Its functions are based on JNDI specification, and it provides some additional features related to its work in cluster.

Visual Administrator

Runtime Control

The “Runtime” tab provides two subtabs for configuration and obtainng information at runtime.

Permissions

Using this tab, the system administrator can assign permissions for access to the naming contexts to different server users. Each permission enables execution of a specific naming operation, or set of operations. The following access permissions are specified:

Change Security Permission – assigned by default to the system administrator. It enables you to allow or deny user access to a specific operation.
Lookup Permission – given to all users by default. It enables search, lookup and lookupLink operations. With Bind and Unbind permissions, it enables the rename operation.
Modify Attributes Permission – enables replace, modify and remove attributes operations
Bind Permission – enables bind and rebind operations
Create Subcontext Permission – enables subcontext creation operation
Get Attributes Permission – enables getAttributes operation
Unbind Permission – enables unbind operation
Destroy Subcontext Permission – enables destroySubContext operation
List Permission – enables list operation
List Bindings Permission – enables listBindings operation

The list of users that have been assigned a selected permission for a particular naming context is displayed in the “Access” pane. System administrators can select users from the “Users on Server” pane and grant them the specified permission by adding them to the “Access” list.

Browser

This feature browses the naming tree at runtime. All contexts are shown with their corresponding names.

Properties

	Server
Property Key	Description	Default Value

Communication	Specifies the standard communication protocol used by the service.	P4
LockTrials	Specifies the number of trials (integer) that the naming does to lock an object in the database for writing. After the lockout procedure times out, an exception is returned to notify the user of the timeout. When many threads are trying to write over the same object of the database – that is, many threads are rebinding the same object – this timeout may occur.	3
LookupLoadBalance	This property takes a boolean value that specifies the method of a lookup process. When “true,” if many cluster elements have the same object bound locally and a lookup is performed without specifying the cluster ID of the server node where the object is, the lookup process is balanced among the servers that contain that object to speed up database operations. The balancing is done only when this property is set to “true” and the context operation is made in the server (client invocations are not balanced).	false

Console Administrator

Naming Service can be administered using the Shell commands from the NAMING command group as well.

Note: For information on Naming service shell commands, refer to the Shell Commands Reference section.

Property Files

../cluster/server/services/naming/properties
Naming Service properties specified in the Visual Administrator ® Properties section can be set from this property file as well.