Examples of Extending the asadmin Utility

Example 4–5 asadmin Subcommand With Empty execute Method

This example shows a class that represents the asadmin subcommand create-mycontainer.

The usage statement for this subcommand is as follows:

asadmin create-mycontainer --originator any-character-string
[--description any-character-string]
[--enabled {true|false}]  any-character-string

This subcommand uses injection to specify that a running domain is required.

package com.example.mycontainer;

import org.glassfish.api.admin.AdminCommand;
import org.glassfish.api.admin.AdminCommandContext;
import org.glassfish.api.I18n;
import org.glassfish.api.Param;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.component.PerLookup;

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

    @Inject
    Domain domain;

    @Param
    String originator;

    @Param(name="description", optional=true)
    @I18n("mydesc")
    String mycontainerDescription

    @Param (acceptableValues="true,false", defaultValue="false", optional=true)
    String enabled
    
    @Param(primary=true)
    String containername;

    /**
     * Executes the subcommand with the subcommand parameters passed as Properties 
     * where the keys are the paramter names and the values the parameter values
     * @param context information 
     */
    public void execute(AdminCommandContext context) {
        // domain and originator are not null
        // mycontainerDescription can be null.
    }
}

The following message text strings are defined in the file LocalStrings.properties for use by the subcommand:

create-mycontainer.command=Creates a custom container
create-mycontainer.command.originator=The originator of the container 
create-mycontainer.command.mydesc=A description of the container
create-mycontainer.command.enabled=Whether the container is enabled or disabled
create-mycontainer.command.containername=The container name

Example 4–6 asadmin Subcommand for Retrieving and Displaying Information

This example shows a class that represents the asadmin subcommand list-runtime-environment. The subcommand determines the operating system or runtime information for GlassFish Server.

The usage statement for this subcommand is as follows:

asadmin list-runtime-environment{runtime|os}

package com.example.env.cli;

import org.glassfish.api.admin.AdminCommand;
import org.glassfish.api.admin.AdminCommandContext;
import org.glassfish.api.ActionReport;
import org.glassfish.api.I18n;
import org.glassfish.api.ActionReport.ExitCode;
import org.glassfish.api.Param;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.component.PerLookup;

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;

/**
 * Demos asadmin CLI extension
 *
  */
@Service(name="list-runtime-environment")
@Scoped(PerLookup.class)
public class ListRuntimeEnvironmentCommand implements AdminCommand {
    
    // this value can be either runtime or os for our demo
    @Param(primary=true)
    String inParam;
    
    public void execute(AdminCommandContext context) {

        ActionReport report = context.getActionReport();
        report.setActionExitCode(ExitCode.SUCCESS);

        // If the inParam is 'os' then this subcommand returns operating system
        // info and if the inParam is 'runtime' then it returns runtime info.
        // Both of the above are based on mxbeans.

        if ("os".equals(inParam)) {
            OperatingSystemMXBean osmb = ManagementFactory.getOperatingSystemMXBean();
            report.setMessage("Your machine operating system name = " + osmb.getName());
        } else if ("runtime".equals(inParam)) {
            RuntimeMXBean rtmb = ManagementFactory.getRuntimeMXBean();
            report.setMessage("Your JVM name = " + rtmb.getVmName());
        } else {
            report.setActionExitCode(ExitCode.FAILURE);
            report.setMessage("operand should be either 'os' or 'runtime'");
        }

    }
}

Example 4–7 asadmin Subcommand for Updating Configuration Data

This example shows a class that represents the asadmin subcommand configure-greeter-container. The subcommand performs a transaction to update configuration data for a container component. For more information about such transactions, see Creating a Transaction to Update Configuration Data.

The usage statement for this subcommand is as follows:

asadmin configure-greeter-container --instances instances [--language language] [--style style]

The acceptable values and default value of each option of the subcommand are shown in the following table. The table also indicates whether each option is optional or required.

Code for the container component is shown in Example of Adding Container Capabilities.

Code that defines the configuration data for the container component is shown in Examples of Adding Configuration Data for a Component.

package org.glassfish.examples.extension.greeter.config;

import org.glassfish.api.admin.AdminCommand;
import org.glassfish.api.admin.AdminCommandContext;
import org.glassfish.api.Param;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.config.Transactions;
import org.jvnet.hk2.config.ConfigSupport;
import org.jvnet.hk2.config.SingleConfigCode;
import org.jvnet.hk2.config.TransactionFailure;

import java.beans.PropertyVetoException;

@Service(name = "configure-greeter-container")
public class ConfigureGreeterContainerCommand implements AdminCommand {

    @Param(acceptableValues = "1,2,3,4,5,6,7,8,9,10", defaultValue = "5")
    String instances;
    @Param(acceptableValues = "english,norsk,francais", defaultValue = "norsk",
    optional = true)
    String language;
    @Param(acceptableValues = "formal,casual,expansive", defaultValue = "formal",
    optional = true)
    String style;
    @Inject
    GreeterContainerConfig config;

    public void execute(AdminCommandContext adminCommandContext) {
        try {
            ConfigSupport.apply(new SingleConfigCode<GreeterContainerConfig>() {

                public Object run(GreeterContainerConfig greeterContainerConfig)
                        throws PropertyVetoException, TransactionFailure {
                    greeterContainerConfig.setNumberOfInstances(instances);
                    greeterContainerConfig.setLanguage(language);
                    greeterContainerConfig.setStyle(style);
                    return null;
                }
            }, config);
        } catch (TransactionFailure e) {
        }

    }
}