| 20 |
|
* which differs from both the primitive double {@code ==} operator |
| 21 |
|
* and from {@link Double#equals}, as if implemented by: |
| 22 |
|
* <pre> {@code |
| 23 |
< |
* boolean bitEquals(double x, double y) { |
| 23 |
> |
* static boolean bitEquals(double x, double y) { |
| 24 |
|
* long xBits = Double.doubleToRawLongBits(x); |
| 25 |
|
* long yBits = Double.doubleToRawLongBits(y); |
| 26 |
|
* return xBits == yBits; |
| 32 |
|
public class AtomicDoubleArray implements java.io.Serializable { |
| 33 |
|
private static final long serialVersionUID = -2308431214976778248L; |
| 34 |
|
|
| 35 |
< |
private final long[] array; |
| 35 |
> |
private final transient long[] array; |
| 36 |
|
|
| 37 |
|
private long checkedByteOffset(int i) { |
| 38 |
|
if (i < 0 || i >= array.length) |
| 162 |
|
* if the current value is <a href="#bitEquals">bitwise equal</a> |
| 163 |
|
* to the expected value. |
| 164 |
|
* |
| 165 |
< |
* <p>May <a href="package-summary.html#Spurious">fail spuriously</a> |
| 165 |
> |
* <p>May <a |
| 166 |
> |
* href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious"> |
| 167 |
> |
* fail spuriously</a> |
| 168 |
|
* and does not provide ordering guarantees, so is only rarely an |
| 169 |
|
* appropriate alternative to {@code compareAndSet}. |
| 170 |
|
* |
| 224 |
|
if (iMax == -1) |
| 225 |
|
return "[]"; |
| 226 |
|
|
| 227 |
< |
StringBuilder b = new StringBuilder(); |
| 227 |
> |
// Double.toString(Math.PI).length() == 17 |
| 228 |
> |
StringBuilder b = new StringBuilder((17 + 2) * (iMax + 1)); |
| 229 |
|
b.append('['); |
| 230 |
< |
for (int i = 0; ; i++) { |
| 230 |
> |
for (int i = 0;; i++) { |
| 231 |
|
b.append(longBitsToDouble(getRaw(byteOffset(i)))); |
| 232 |
|
if (i == iMax) |
| 233 |
|
return b.append(']').toString(); |
| 235 |
|
} |
| 236 |
|
} |
| 237 |
|
|
| 238 |
+ |
/** |
| 239 |
+ |
* Saves the state to a stream (that is, serializes it). |
| 240 |
+ |
* |
| 241 |
+ |
* @serialData The length of the array is emitted (int), followed by all |
| 242 |
+ |
* of its elements (each a {@code double}) in the proper order. |
| 243 |
+ |
*/ |
| 244 |
+ |
private void writeObject(java.io.ObjectOutputStream s) |
| 245 |
+ |
throws java.io.IOException{ |
| 246 |
+ |
s.defaultWriteObject(); |
| 247 |
+ |
|
| 248 |
+ |
// Write out array length |
| 249 |
+ |
int length = length(); |
| 250 |
+ |
s.writeInt(length); |
| 251 |
+ |
|
| 252 |
+ |
// Write out all elements in the proper order. |
| 253 |
+ |
for (int i = 0; i < length; i++) |
| 254 |
+ |
s.writeDouble(get(i)); |
| 255 |
+ |
} |
| 256 |
+ |
|
| 257 |
+ |
/** |
| 258 |
+ |
* Reconstitutes the instance from a stream (that is, deserializes it). |
| 259 |
+ |
*/ |
| 260 |
+ |
private void readObject(java.io.ObjectInputStream s) |
| 261 |
+ |
throws java.io.IOException, ClassNotFoundException { |
| 262 |
+ |
s.defaultReadObject(); |
| 263 |
+ |
|
| 264 |
+ |
// Read in array length and allocate array |
| 265 |
+ |
int length = s.readInt(); |
| 266 |
+ |
unsafe.putObjectVolatile(this, arrayOffset, new long[length]); |
| 267 |
+ |
|
| 268 |
+ |
// Read in all elements in the proper order. |
| 269 |
+ |
for (int i = 0; i < length; i++) |
| 270 |
+ |
set(i, s.readDouble()); |
| 271 |
+ |
} |
| 272 |
+ |
|
| 273 |
|
// Unsafe mechanics |
| 274 |
|
private static final sun.misc.Unsafe unsafe = getUnsafe(); |
| 275 |
+ |
private static final long arrayOffset; |
| 276 |
|
private static final int base = unsafe.arrayBaseOffset(long[].class); |
| 277 |
|
private static final int shift; |
| 278 |
|
|
| 279 |
|
static { |
| 280 |
< |
int scale = unsafe.arrayIndexScale(long[].class); |
| 281 |
< |
if ((scale & (scale - 1)) != 0) |
| 282 |
< |
throw new Error("data type scale not a power of two"); |
| 283 |
< |
shift = 31 - Integer.numberOfLeadingZeros(scale); |
| 280 |
> |
try { |
| 281 |
> |
Class<?> k = AtomicDoubleArray.class; |
| 282 |
> |
arrayOffset = unsafe.objectFieldOffset |
| 283 |
> |
(k.getDeclaredField("array")); |
| 284 |
> |
int scale = unsafe.arrayIndexScale(long[].class); |
| 285 |
> |
if ((scale & (scale - 1)) != 0) |
| 286 |
> |
throw new Error("data type scale not a power of two"); |
| 287 |
> |
shift = 31 - Integer.numberOfLeadingZeros(scale); |
| 288 |
> |
} catch (Exception e) { |
| 289 |
> |
throw new Error(e); |
| 290 |
> |
} |
| 291 |
|
} |
| 292 |
|
|
| 293 |
|
/** |
