Class HotSpotVirtualMachine

java.lang.Object

com.sun.tools.attach.VirtualMachine

sun.tools.attach.HotSpotVirtualMachine

Direct Known Subclasses:

BsdVirtualMachine, LinuxVirtualMachine, SolarisVirtualMachine, WindowsVirtualMachine

public abstract class HotSpotVirtualMachine
extends VirtualMachine

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	ATTACH_ERROR_BADJAR
private static final int	ATTACH_ERROR_NOTONCP
private static final int	ATTACH_ERROR_STARTFAIL
private long	attachTimeout
private static long	defaultAttachTimeout
private static final int	JNI_ENOMEM

Constructor Summary

Constructors

Constructor	Description
HotSpotVirtualMachine(AttachProvider provider, String id)

Method Summary

Modifier and Type	Method	Description
(package private) final long	attachTimeout()
InputStream	dumpHeap(Object... args)
(package private) abstract InputStream	execute(String cmd, Object... args)
private InputStream	executeCommand(String cmd, Object... args)
InputStream	executeJCmd(String command)
Properties	getAgentProperties()	Returns the current agent properties in the target virtual machine.
Properties	getSystemProperties()	Returns the current system properties in the target virtual machine.
InputStream	heapHisto(Object... args)
void	loadAgent(String agent, String options)	Loads an agent.
private void	loadAgentLibrary(String agentLibrary, boolean isAbsolute, String options)
void	loadAgentLibrary(String agentLibrary, String options)	Loads an agent library.
void	loadAgentPath(String agentLibrary, String options)	Load a native agent library by full pathname.
void	localDataDump()
InputStream	printFlag(String name)
(package private) int	readInt(InputStream in)
InputStream	remoteDataDump(Object... args)
InputStream	setFlag(String name, String value)

Methods inherited from class VirtualMachine

attach, attach, detach, equals, hashCode, id, list, loadAgent, loadAgentLibrary, loadAgentPath, provider, toString

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

JNI_ENOMEM

private static final int JNI_ENOMEM

See Also:

• Constant Field Values

ATTACH_ERROR_BADJAR

private static final int ATTACH_ERROR_BADJAR

See Also:

• Constant Field Values

ATTACH_ERROR_NOTONCP

private static final int ATTACH_ERROR_NOTONCP

See Also:

• Constant Field Values

ATTACH_ERROR_STARTFAIL

private static final int ATTACH_ERROR_STARTFAIL

See Also:

• Constant Field Values

defaultAttachTimeout

private static long defaultAttachTimeout

attachTimeout

private volatile long attachTimeout

Constructor Details

HotSpotVirtualMachine

HotSpotVirtualMachine(AttachProvider provider,
 String id)

Method Details

loadAgentLibrary

private void loadAgentLibrary(String agentLibrary,
 boolean isAbsolute,
 String options)
                       throws AgentLoadException,
AgentInitializationException,
IOException

Throws:

AgentLoadException

AgentInitializationException

IOException

loadAgentLibrary

public void loadAgentLibrary(String agentLibrary,
 String options)
                      throws AgentLoadException,
AgentInitializationException,
IOException

Description copied from class: VirtualMachine

Loads an agent library.

A JVM TI client is called an agent. It is developed in a native language. A JVM TI agent is deployed in a platform specific manner but it is typically the platform equivalent of a dynamic library. This method causes the given agent library to be loaded into the target VM (if not already loaded). It then causes the target VM to invoke the Agent_OnAttach function as specified in the JVM Tools Interface specification. Note that the Agent_OnAttach function is invoked even if the agent library was loaded prior to invoking this method.

The agent library provided is the name of the agent library. It is interpreted in the target virtual machine in an implementation-dependent manner. Typically an implementation will expand the library name into an operating system specific file name. For example, on UNIX systems, the name foo might be expanded to libfoo.so, and located using the search path specified by the LD_LIBRARY_PATH environment variable.

If the Agent_OnAttach function in the agent library returns an error then an AgentInitializationException is thrown. The return value from the Agent_OnAttach can then be obtained by invoking the returnValue method on the exception.

Specified by:

loadAgentLibrary in class VirtualMachine

Parameters:

agentLibrary - The name of the agent library.

options - The options to provide to the Agent_OnAttach function (can be null).

Throws:

AgentLoadException - If the agent library does not exist, or cannot be loaded for another reason.

AgentInitializationException - If the Agent_OnAttach function returns an error

IOException - If an I/O error occurs

See Also:

• AgentInitializationException.returnValue()

loadAgentPath

public void loadAgentPath(String agentLibrary,
 String options)
                   throws AgentLoadException,
AgentInitializationException,
IOException

Description copied from class: VirtualMachine

Load a native agent library by full pathname.

A JVM TI client is called an agent. It is developed in a native language. A JVM TI agent is deployed in a platform specific manner but it is typically the platform equivalent of a dynamic library. This method causes the given agent library to be loaded into the target VM (if not already loaded). It then causes the target VM to invoke the Agent_OnAttach function as specified in the JVM Tools Interface specification. Note that the Agent_OnAttach function is invoked even if the agent library was loaded prior to invoking this method.

The agent library provided is the absolute path from which to load the agent library. Unlike loadAgentLibrary, the library name is not expanded in the target virtual machine.

If the Agent_OnAttach function in the agent library returns an error then an AgentInitializationException is thrown. The return value from the Agent_OnAttach can then be obtained by invoking the returnValue method on the exception.

Specified by:

loadAgentPath in class VirtualMachine

Parameters:

agentLibrary - The full path of the agent library.

options - The options to provide to the Agent_OnAttach function (can be null).

Throws:

AgentLoadException - If the agent library does not exist, or cannot be loaded for another reason.

AgentInitializationException - If the Agent_OnAttach function returns an error

IOException - If an I/O error occurs

See Also:

• AgentInitializationException.returnValue()

loadAgent

public void loadAgent(String agent,
 String options)
               throws AgentLoadException,
AgentInitializationException,
IOException

Description copied from class: VirtualMachine

Loads an agent.

The agent provided to this method is a path name to a JAR file on the file system of the target virtual machine. This path is passed to the target virtual machine where it is interpreted. The target virtual machine attempts to start the agent as specified by the java.lang.instrument specification. That is, the specified JAR file is added to the system class path (of the target virtual machine), and the agentmain method of the agent class, specified by the Agent-Class attribute in the JAR manifest, is invoked. This method completes when the agentmain method completes.

Specified by:

loadAgent in class VirtualMachine

Parameters:

agent - Path to the JAR file containing the agent.

options - The options to provide to the agent's agentmain method (can be null).

Throws:

AgentLoadException - If the agent does not exist, or cannot be started in the manner specified in the java.lang.instrument specification.

AgentInitializationException - If the agentmain throws an exception

IOException - If an I/O error occurs

getSystemProperties

public Properties getSystemProperties()
                               throws IOException

Description copied from class: VirtualMachine

Returns the current system properties in the target virtual machine.

This method returns the system properties in the target virtual machine. Properties whose key or value is not a String are omitted. The method is approximately equivalent to the invocation of the method System.getProperties in the target virtual machine except that properties with a key or value that is not a String are not included.

This method is typically used to decide which agent to load into the target virtual machine with loadAgent, or loadAgentLibrary. For example, the java.home or user.dir properties might be use to create the path to the agent library or JAR file.

Specified by:

getSystemProperties in class VirtualMachine

Returns:

The system properties

Throws:

IOException - If an I/O error occurs

See Also:

• System.getProperties()
• VirtualMachine.loadAgentLibrary(String, String)
• VirtualMachine.loadAgent(String, String)

getAgentProperties

public Properties getAgentProperties()
                              throws IOException

Description copied from class: VirtualMachine

Returns the current agent properties in the target virtual machine.

The target virtual machine can maintain a list of properties on behalf of agents. The manner in which this is done, the names of the properties, and the types of values that are allowed, is implementation specific. Agent properties are typically used to store communication end-points and other agent configuration details. For example, a debugger agent might create an agent property for its transport address.

This method returns the agent properties whose key and value is a String. Properties whose key or value is not a String are omitted. If there are no agent properties maintained in the target virtual machine then an empty property list is returned.

Specified by:

getAgentProperties in class VirtualMachine

Returns:

The agent properties

Throws:

IOException - If an I/O error occurs

localDataDump

public void localDataDump()
                   throws IOException

Throws:

IOException

remoteDataDump

public InputStream remoteDataDump(Object... args)
                           throws IOException

Throws:

IOException

dumpHeap

public InputStream dumpHeap(Object... args)
                     throws IOException

Throws:

IOException

heapHisto

public InputStream heapHisto(Object... args)
                      throws IOException

Throws:

IOException

setFlag

public InputStream setFlag(String name,
 String value)
                    throws IOException

Throws:

IOException

printFlag

public InputStream printFlag(String name)
                      throws IOException

Throws:

IOException

executeJCmd

public InputStream executeJCmd(String command)
                        throws IOException

Throws:

IOException

execute

abstract InputStream execute(String cmd,
 Object... args)
                      throws AgentLoadException,
IOException

Throws:

AgentLoadException

IOException

executeCommand

private InputStream executeCommand(String cmd,
 Object... args)
                            throws IOException

Throws:

IOException

readInt

int readInt(InputStream in)
     throws IOException

Throws:

IOException

attachTimeout

final long attachTimeout()