| 6 |
|
|
| 7 |
|
package java.util.concurrent; |
| 8 |
|
|
| 9 |
< |
import java.lang.invoke.MethodHandles; |
| 10 |
< |
import java.lang.invoke.VarHandle; |
| 9 |
> |
import java.lang.reflect.Field; |
| 10 |
|
import java.util.AbstractSet; |
| 11 |
|
import java.util.Collection; |
| 12 |
|
import java.util.Collections; |
| 476 |
|
: ((ConcurrentSkipListMap.SubMap<E,?>)m).new SubMapKeyIterator(); |
| 477 |
|
} |
| 478 |
|
|
| 479 |
< |
// Support for resetting map in clone |
| 479 |
> |
/** Initializes map field; for use in clone. */ |
| 480 |
|
private void setMap(ConcurrentNavigableMap<E,Object> map) { |
| 481 |
< |
MAP.setVolatile(this, map); |
| 482 |
< |
} |
| 483 |
< |
|
| 484 |
< |
// VarHandle mechanics |
| 485 |
< |
private static final VarHandle MAP; |
| 486 |
< |
static { |
| 481 |
> |
Field mapField = java.security.AccessController.doPrivileged( |
| 482 |
> |
(java.security.PrivilegedAction<Field>) () -> { |
| 483 |
> |
try { |
| 484 |
> |
Field f = ConcurrentSkipListSet.class |
| 485 |
> |
.getDeclaredField("m"); |
| 486 |
> |
f.setAccessible(true); |
| 487 |
> |
return f; |
| 488 |
> |
} catch (ReflectiveOperationException e) { |
| 489 |
> |
throw new Error(e); |
| 490 |
> |
}}); |
| 491 |
|
try { |
| 492 |
< |
MethodHandles.Lookup l = MethodHandles.lookup(); |
| 493 |
< |
MAP = l.findVarHandle(ConcurrentSkipListSet.class, "m", |
| 491 |
< |
ConcurrentNavigableMap.class); |
| 492 |
< |
} catch (ReflectiveOperationException e) { |
| 492 |
> |
mapField.set(this, map); |
| 493 |
> |
} catch (IllegalAccessException e) { |
| 494 |
|
throw new Error(e); |
| 495 |
|
} |
| 496 |
|
} |
