| 80 |
|
* in security-sensitive applications. Additionally, |
| 81 |
|
* default-constructed instances do not use a cryptographically random |
| 82 |
|
* seed unless the {@linkplain System#getProperty system property} |
| 83 |
< |
* {@code java.util.secureRandomSeed} is set to {@code true}. |
| 83 |
> |
* {@systemProperty java.util.secureRandomSeed} is set to {@code true}. |
| 84 |
|
* |
| 85 |
|
* @author Guy Steele |
| 86 |
|
* @author Doug Lea |
| 219 |
|
return seed += gamma; |
| 220 |
|
} |
| 221 |
|
|
| 222 |
+ |
// IllegalArgumentException messages |
| 223 |
+ |
static final String BAD_BOUND = "bound must be positive"; |
| 224 |
+ |
static final String BAD_RANGE = "bound must be greater than origin"; |
| 225 |
+ |
static final String BAD_SIZE = "size must be non-negative"; |
| 226 |
+ |
|
| 227 |
|
/** |
| 228 |
|
* The seed generator for default constructors. |
| 229 |
|
*/ |
| 230 |
< |
private static final AtomicLong defaultGen = new AtomicLong(initialSeed()); |
| 230 |
> |
private static final AtomicLong defaultGen |
| 231 |
> |
= new AtomicLong(mix64(System.currentTimeMillis()) ^ |
| 232 |
> |
mix64(System.nanoTime())); |
| 233 |
|
|
| 234 |
< |
private static long initialSeed() { |
| 234 |
> |
// at end of <clinit> to survive static initialization circularity |
| 235 |
> |
static { |
| 236 |
|
if (java.security.AccessController.doPrivileged( |
| 237 |
|
new java.security.PrivilegedAction<Boolean>() { |
| 238 |
|
public Boolean run() { |
| 242 |
|
long s = (long)seedBytes[0] & 0xffL; |
| 243 |
|
for (int i = 1; i < 8; ++i) |
| 244 |
|
s = (s << 8) | ((long)seedBytes[i] & 0xffL); |
| 245 |
< |
return s; |
| 245 |
> |
defaultGen.set(s); |
| 246 |
|
} |
| 239 |
– |
return (mix64(System.currentTimeMillis()) ^ |
| 240 |
– |
mix64(System.nanoTime())); |
| 247 |
|
} |
| 248 |
|
|
| 243 |
– |
// IllegalArgumentException messages |
| 244 |
– |
static final String BAD_BOUND = "bound must be positive"; |
| 245 |
– |
static final String BAD_RANGE = "bound must be greater than origin"; |
| 246 |
– |
static final String BAD_SIZE = "size must be non-negative"; |
| 247 |
– |
|
| 249 |
|
/* |
| 250 |
|
* Internal versions of nextX methods used by streams, as well as |
| 251 |
|
* the public nextX(origin, bound) methods. These exist mainly to |
| 375 |
|
* may, and typically does, vary across program invocations. |
| 376 |
|
*/ |
| 377 |
|
public SplittableRandom() { // emulate defaultGen.split() |
| 378 |
< |
long s = defaultGen.getAndAdd(2 * GOLDEN_GAMMA); |
| 378 |
> |
long s = defaultGen.getAndAdd(GOLDEN_GAMMA << 1); |
| 379 |
|
this.seed = mix64(s); |
| 380 |
|
this.gamma = mixGamma(s + GOLDEN_GAMMA); |
| 381 |
|
} |
| 399 |
|
} |
| 400 |
|
|
| 401 |
|
/** |
| 402 |
+ |
* Fills a user-supplied byte array with generated pseudorandom bytes. |
| 403 |
+ |
* |
| 404 |
+ |
* @param bytes the byte array to fill with pseudorandom bytes |
| 405 |
+ |
* @throws NullPointerException if bytes is null |
| 406 |
+ |
* @since 10 |
| 407 |
+ |
*/ |
| 408 |
+ |
public void nextBytes(byte[] bytes) { |
| 409 |
+ |
int i = 0; |
| 410 |
+ |
int len = bytes.length; |
| 411 |
+ |
for (int words = len >> 3; words--> 0; ) { |
| 412 |
+ |
long rnd = nextLong(); |
| 413 |
+ |
for (int n = 8; n--> 0; rnd >>>= Byte.SIZE) |
| 414 |
+ |
bytes[i++] = (byte)rnd; |
| 415 |
+ |
} |
| 416 |
+ |
if (i < len) |
| 417 |
+ |
for (long rnd = nextLong(); i < len; rnd >>>= Byte.SIZE) |
| 418 |
+ |
bytes[i++] = (byte)rnd; |
| 419 |
+ |
} |
| 420 |
+ |
|
| 421 |
+ |
/** |
| 422 |
|
* Returns a pseudorandom {@code int} value. |
| 423 |
|
* |
| 424 |
|
* @return a pseudorandom {@code int} value |
| 799 |
|
* @return a stream of pseudorandom {@code double} values, |
| 800 |
|
* each with the given origin (inclusive) and bound (exclusive) |
| 801 |
|
* @throws IllegalArgumentException if {@code streamSize} is |
| 802 |
< |
* less than zero |
| 782 |
< |
* @throws IllegalArgumentException if {@code randomNumberOrigin} |
| 802 |
> |
* less than zero, or {@code randomNumberOrigin} |
| 803 |
|
* is greater than or equal to {@code randomNumberBound} |
| 804 |
|
*/ |
| 805 |
|
public DoubleStream doubles(long streamSize, double randomNumberOrigin, |
