Package com.jogamp.common.util

Class UnsafeUtil

java.lang.Object

com.jogamp.common.util.UnsafeUtil

public class UnsafeUtil
extends Object

Utility methods allowing easy access to certain Unsafe functionality.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	UnsafeUtil()

Method Summary

Modifier and Type	Method	Description
static <T> T	doWithoutIllegalAccessLogger(PrivilegedAction<T> action)	Issue the given user action while jdk.internal.module.IllegalAcessLogger's logger has been temporarily disabled.
static long	getLong(long address)
static long	getLong(Object o, long offset)
static Object	getObject(Object o, long offset)
static Object	getObjectVolatile(Object o, long offset)
static boolean	hasIllegalAccessLoggerAccess()	Returns true if access to jdk.internal.module.IllegalAcessLogger's logger field is available and has not caused an exception.
static boolean	hasInvokeCleaner()	Returns true if sun.misc.Unsafe.invokeCleaner(java.nio.ByteBuffer) is available and has not caused an exception.
static boolean	invokeCleaner(ByteBuffer bb)	Access to sun.misc.Unsafe.invokeCleaner(java.nio.ByteBuffer).
static void	putLong(long address, long x)
static void	putLong(Object o, long offset, long x)
static void	putObject(Object o, long offset, Object x)
static void	putObjectVolatile(Object o, long offset, Object x)
static long	staticFieldOffset(Field f)

Methods inherited from class java.lang.Object

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

Constructor Detail

UnsafeUtil

protected UnsafeUtil()

Method Detail

hasInvokeCleaner

public static boolean hasInvokeCleaner()

Returns true if sun.misc.Unsafe.invokeCleaner(java.nio.ByteBuffer) is available and has not caused an exception.

See Also:

invokeCleaner(ByteBuffer)

invokeCleaner

public static boolean invokeCleaner(ByteBuffer bb)

Access to sun.misc.Unsafe.invokeCleaner(java.nio.ByteBuffer).

If b is an direct NIO buffer, i.e DirectBuffer, calls it's sun.misc.Cleaner instance clean() method once.

Returns:

true if successful, otherwise false.

See Also:

hasInvokeCleaner()

staticFieldOffset

public static long staticFieldOffset(Field f)

getObject

public static Object getObject(Object o,
                               long offset)

putObject

public static void putObject(Object o,
                             long offset,
                             Object x)

getObjectVolatile

public static Object getObjectVolatile(Object o,
                                       long offset)

putObjectVolatile

public static void putObjectVolatile(Object o,
                                     long offset,
                                     Object x)

getLong

public static long getLong(Object o,
                           long offset)

putLong

public static void putLong(Object o,
                           long offset,
                           long x)

getLong

public static long getLong(long address)

putLong

public static void putLong(long address,
                           long x)

hasIllegalAccessLoggerAccess

public static boolean hasIllegalAccessLoggerAccess()

Returns true if access to jdk.internal.module.IllegalAcessLogger's logger field is available and has not caused an exception.

See Also:

doWithoutIllegalAccessLogger(PrivilegedAction)

doWithoutIllegalAccessLogger

public static <T> T doWithoutIllegalAccessLogger(PrivilegedAction<T> action)
                                          throws RuntimeException

Issue the given user action while jdk.internal.module.IllegalAcessLogger's logger has been temporarily disabled.

The caller shall place this call into their own SecurityUtil.doPrivileged(PrivilegedAction) block.

In case the runtime is not PlatformPropsImpl.JAVA_9 or the logger is not accessible or disabling caused an exception, the user action is just executed w/o temporary logger modifications.

Parameters:

action - the user action task

Throws:

RuntimeException - is thrown for a caught Throwable while executing the user action

See Also:

hasIllegalAccessLoggerAccess()