Adding an asadmin Command

An asadmin command identifies the operation or task that a user is to perform. Adding an asadmin command enables the user to perform these tasks and operations through the asadmin utility.

The following topics are addressed here:

• Representing an asadmin Command as a Java Class

• Specifying the Name of an asadmin Command

• Ensuring That an AdminCommand Implementation Is Stateless

• Example of Adding an asadmin Command

Representing an asadmin Command as a Java Class

Each asadmin command that you are adding must be represented as a Java class. To represent an asadmin command as a Java class, write a Java class that implements the org.glassfish.api.admin.AdminCommand interface. Write one class for each command that you are adding. Do not represent multiple asadmin commands in a single class.

Annotate the declaration of your implementations of the AdminCommand interface with the org.jvnet.hk2.annotations.Service annotation. The @Service annotation ensures that the following requirements for your implementations are met:

• The implementations are eligible for resource injection and resource extraction.

• The implementations are location independent, provided that the component that contains them is made known to the Enterprise Server runtime.

  For information about how to make a component known to the Enterprise Server runtime, see Integrating an Add-On Component With Enterprise Server.

Specifying the Name of an asadmin Command

To specify the name of the command, set the name element of the @Service annotation to the name.

Commands that are supplied in Enterprise Server distributions typically create, delete, and list objects of a particular type. For consistency with the names of commands that are supplied in Enterprise Server distributions, follow these conventions when specifying the name of a command:

• For commands that create an object of a particular type, use the name create-object.

• For commands that delete an object of a particular type, use the name delete-object.

• For commands that list all objects of a particular type, use the name list-objects.

For example, Enterprise Server provides the following commands for creating, deleting, and listing HTTP listeners:

• create-http-listener

• delete-http-listener

• list-http-listeners

You must also ensure that the name of your command is unique. To obtain a complete list of the names of all asadmin commands that are installed, use the list-commands(1) command. For a complete list of asadmin commands that are supplied in Enterprise Server distributions, see Sun GlassFish Enterprise Server v3 Reference Manual.

Ensuring That an AdminCommand Implementation Is Stateless

To enable multiple clients to run a command simultaneously, ensure that the implementation of the AdminCommand interface for the command is stateless. To ensure that the implementation of the AdminCommand interface is stateless, annotate the declaration of your implementation with the org.jvnet.hk2.annotations.Scoped annotation. In the @Scoped annotation, set the scope as follows:

• To instantiate the command for each lookup, set the scope to PerLookup.class.

• To instantiate the command only once for each session, set the scope to Singleton.

Example of Adding an asadmin Command

Adding an asadmin Command

This example shows the declaration of the class CreateMycontainer that represents an asadmin command that is named create-mycontainer. The command is instantiated for each lookup.

package com.example.mycontainer;

import org.glassfish.api.admin.AdminCommand;
...
import org.jvnet.hk2.annotations.Service;
...
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.component.PerLookup;

/**
 * Sample command
 */
@Service(name="create-mycontainer")
@Scoped(PerLookup.class)
public Class CreateMycontainer implements AdminCommand {
…
}