Interface ThreadGroupReference

All Superinterfaces:

Mirror, ObjectReference, Value

public interface ThreadGroupReference
extends ObjectReference

A thread group object from the target VM. A ThreadGroupReference is an ObjectReference with additional access to threadgroup-specific information from the target VM.

Since:

1.3

Field Summary

Fields declared in interface ObjectReference

INVOKE_NONVIRTUAL, INVOKE_SINGLE_THREADED

Modifier and Type	Field	Description
static final int	INVOKE_NONVIRTUAL	Perform non-virtual method invocation
static final int	INVOKE_SINGLE_THREADED	Perform method invocation with only the invoking thread resumed

Method Summary

Modifier and Type	Method	Description
String	name()	Returns the name of this thread group.
ThreadGroupReference	parent()	Returns the parent of this thread group.
void	resume()	Resumes all threads in this thread group.
void	suspend()	Suspends all threads in this thread group.
List<ThreadGroupReference>	threadGroups()	Returns a List containing a ThreadGroupReference for each subgroup.
List<ThreadReference>	threads()	Returns a List containing a ThreadReference for each live platform thread in this thread group.

Methods declared in interface Mirror

toString, virtualMachine

Modifier and Type	Method	Description
String	toString()	Returns a String describing this mirror
VirtualMachine	virtualMachine()	Gets the VirtualMachine to which this Mirror belongs.

Methods declared in interface ObjectReference

disableCollection, enableCollection, entryCount, equals, getValue, getValues, hashCode, invokeMethod, isCollected, owningThread, referenceType, referringObjects, setValue, uniqueID, waitingThreads

Modifier and Type	Method	Description
void	disableCollection()	Prevents garbage collection for this object.
void	enableCollection()	Permits garbage collection for this object.
int	entryCount()	Returns the number of times this object's monitor has been entered by the current owning thread if the owning thread is platform thread; Returns 0 if not owned by a platform thread.
boolean	equals(Object obj)	Compares the specified Object with this ObjectReference for equality.
Value	getValue(Field sig)	Gets the value of a given instance or static field in this object.
Map<Field,Value>	getValues(List<? extends Field> fields)	Gets the value of multiple instance and/or static fields in this object.
int	hashCode()	Returns the hash code value for this ObjectReference.
Value	invokeMethod(ThreadReference thread, Method method, List<? extends Value> arguments, int options)	Invokes the specified Method on this object in the target VM.
boolean	isCollected()	Determines if this object has been garbage collected in the target VM.
ThreadReference	owningThread()	Returns a ThreadReference for the platform thread, if any, which currently owns this object's monitor.
ReferenceType	referenceType()	Gets the ReferenceType that mirrors the type of this object.
List<ObjectReference>	referringObjects(long maxReferrers)	Returns objects that directly reference this object.
void	setValue(Field field, Value value)	Sets the value of a given instance or static field in this object.
long	uniqueID()	Returns a unique identifier for this ObjectReference.
List<ThreadReference>	waitingThreads()	Returns a List containing a ThreadReference for each platform thread currently waiting for this object's monitor.

Methods declared in interface Value

type

Modifier and Type	Method	Description
Type	type()	Returns the run-time type of this value.

Method Details

name

String name()

Returns the name of this thread group.

Returns:

the string containing the thread group name.

parent

ThreadGroupReference parent()

Returns the parent of this thread group.

Returns:

a ThreadGroupReference mirroring the parent of this thread group in the target VM, or null if this is a top-level thread group.

suspend

void suspend()

Suspends all threads in this thread group. Each thread in this group and in all of its subgroups will be suspended as described in ThreadReference.suspend(). This is not guaranteed to be an atomic operation; if the target VM is not interrupted at the time this method is called, it is possible that new threads will be created between the time that threads are enumerated and all of them have been suspended.

Throws:

VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().

resume

void resume()

Resumes all threads in this thread group. Each thread in this group and in all of its subgroups will be resumed as described in ThreadReference.resume().

Throws:

VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().

threads

List<ThreadReference> threads()

Returns a List containing a ThreadReference for each live platform thread in this thread group. Virtual threads are not included. Only the live platform threads in this immediate thread group (and not its subgroups) are returned. A thread is alive if it has been started and has not terminated.

Returns:

a List of ThreadReference objects mirroring the live platform threads from this thread group in the target VM.

threadGroups

List<ThreadGroupReference> threadGroups()

Returns a List containing a ThreadGroupReference for each subgroup. Only the thread groups in this immediate thread group (and not its subgroups) are returned.

Returns:

a List of ThreadGroupReference objects mirroring the thread groups from this thread group in the target VM.