GC

extends Object

java.lang.Object
↳	sun.misc.GC

Class Overview

Support for garbage-collection latency requests.

Summary

Nested Classes
class	GC.LatencyRequest	Represents an active garbage-collection latency request.

Public Methods
static long	currentLatencyTarget() Returns the current smallest garbage-collection latency request, or zero if there are no active requests.
static long	maxObjectInspectionAge() Returns the maximum object-inspection age, which is the number of real-time milliseconds that have elapsed since the least-recently-inspected heap object was last inspected by the garbage collector.
static GC.LatencyRequest	requestLatency(long latency) Makes a new request for a garbage-collection latency of the given number of real-time milliseconds.

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Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this object.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
void	finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
final Class<?>	getClass() Returns the runtime class of this `Object`.
int	hashCode() Returns a hash code value for the object.
final void	notify() Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll() Wakes up all threads that are waiting on this object's monitor.
String	toString() Returns a string representation of the object.
final void	wait() Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
final void	wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
final void	wait(long timeout) Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.

Public Methods

public static long currentLatencyTarget ()

Returns the current smallest garbage-collection latency request, or zero if there are no active requests.

public static long maxObjectInspectionAge ()

Returns the maximum object-inspection age, which is the number of real-time milliseconds that have elapsed since the least-recently-inspected heap object was last inspected by the garbage collector.

For simple stop-the-world collectors this value is just the time since the most recent collection. For generational collectors it is the time since the oldest generation was most recently collected. Other collectors are free to return a pessimistic estimate of the elapsed time, or simply the time since the last full collection was performed.

Note that in the presence of reference objects, a given object that is no longer strongly reachable may have to be inspected multiple times before it can be reclaimed.

public static GC.LatencyRequest requestLatency (long latency)

Makes a new request for a garbage-collection latency of the given number of real-time milliseconds. A low-priority daemon thread makes a best effort to ensure that the maximum object-inspection age never exceeds the smallest of the currently active requests.

Parameters

latency	The requested latency

Throws

IllegalArgumentException	If the given `latency` is non-positive

Interfaces

Classes

Enums

Exceptions

Errors

GC