org.jolokia.jvmagent.client.command

Class AbstractBaseCommand

java.lang.Object

org.jolokia.jvmagent.client.command.AbstractBaseCommand

Direct Known Subclasses:

HelpCommand, ListCommand, StartCommand, StatusCommand, StopCommand, ToggleCommand, VersionCommand

public abstract class AbstractBaseCommand
extends Object

Stateless Base command providing helper functions

Since:

06.10.11

Author:

roland

Constructor Summary

Constructors

Constructor and Description
AbstractBaseCommand()

Method Summary

Methods

Modifier and Type	Method and Description
protected String	checkAgentUrl(Object pVm) Check whether an agent is registered by checking the existance of the system property JvmAgent.JOLOKIA_AGENT_URL.
protected Properties	getAgentSystemProperties(Object pVm) Execute com.sun.tools.attach.VirtualMachine#getSystemProperties() via reflection
protected String	getProcessDescription(OptionsAndArgs pOpts, VirtualMachineHandler pHandler) Get a description of the process attached, either the numeric id only or, if a pattern is given, the pattern and the associated PID
protected void	loadAgent(Object pVm, OptionsAndArgs pOpts, String... pAdditionalOpts) Execute com.sun.tools.attach.VirtualMachine#loadAgent(String, String) via reflection

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractBaseCommand

public AbstractBaseCommand()

Method Detail

loadAgent

protected void loadAgent(Object pVm,
             OptionsAndArgs pOpts,
             String... pAdditionalOpts)
                  throws NoSuchMethodException,
                         InvocationTargetException,
                         IllegalAccessException

Execute com.sun.tools.attach.VirtualMachine#loadAgent(String, String) via reflection

Parameters:

pVm - the VirtualMachine object, typeless

pOpts - options from where to extract the agent path and options

pAdditionalOpts - optional additional options to be appended to the agent options. Must be a CSV string.

Throws:

NoSuchMethodException

InvocationTargetException

IllegalAccessException

checkAgentUrl

protected String checkAgentUrl(Object pVm)
                        throws NoSuchMethodException,
                               InvocationTargetException,
                               IllegalAccessException

Check whether an agent is registered by checking the existance of the system property JvmAgent.JOLOKIA_AGENT_URL. This can be used to check, whether a Jolokia agent has been already attached and started. ("start" will set this property, "stop" will remove it).

Parameters:

pVm - the com.sun.tools.attach.VirtualMachine, but typeless

Returns:

the agent URL if it is was set by a previous 'start' command.

Throws:

NoSuchMethodException

InvocationTargetException

IllegalAccessException

getAgentSystemProperties

protected Properties getAgentSystemProperties(Object pVm)
                                       throws NoSuchMethodException,
                                              InvocationTargetException,
                                              IllegalAccessException

Execute com.sun.tools.attach.VirtualMachine#getSystemProperties() via reflection

Parameters:

pVm - the VirtualMachine object, typeless

Returns:

the system properties

Throws:

NoSuchMethodException

InvocationTargetException

IllegalAccessException

getProcessDescription

protected String getProcessDescription(OptionsAndArgs pOpts,
                           VirtualMachineHandler pHandler)

Get a description of the process attached, either the numeric id only or, if a pattern is given, the pattern and the associated PID

Parameters:

pOpts - options from where to take the PID or pattern

pHandler - handler for looking up the process in case of a pattern lookup

Returns:

a description of the process