public void run() {
try {
BigInteger p = BigInteger.ONE;
while (!cancelled) queue.put(p = p.nextProbablePrime());
} catch (InterruptedException consumed) {
}
}
public static void nextProbablePrime() throws Exception {
int failCount = 0;
BigInteger p1, p2, p3;
p1 = p2 = p3 = ZERO;
// First test nextProbablePrime on the low range starting at zero
for (int i = 0; i < primesTo100.length; i++) {
p1 = p1.nextProbablePrime();
if (p1.longValue() != primesTo100[i]) {
System.err.println("low range primes failed");
System.err.println("p1 is " + p1);
System.err.println("expected " + primesTo100[i]);
failCount++;
}
}
// Test nextProbablePrime on a relatively small, known prime sequence
p1 = BigInteger.valueOf(aPrimeSequence[0]);
for (int i = 1; i < aPrimeSequence.length; i++) {
p1 = p1.nextProbablePrime();
if (p1.longValue() != aPrimeSequence[i]) {
System.err.println("prime sequence failed");
failCount++;
}
}
// Next, pick some large primes, use nextProbablePrime to find the
// next one, and make sure there are no primes in between
for (int i = 0; i < 100; i += 10) {
p1 = BigInteger.probablePrime(50 + i, rnd);
p2 = p1.add(ONE);
p3 = p1.nextProbablePrime();
while (p2.compareTo(p3) < 0) {
if (p2.isProbablePrime(100)) {
System.err.println("nextProbablePrime failed");
System.err.println("along range " + p1.toString(16));
System.err.println("to " + p3.toString(16));
failCount++;
break;
}
p2 = p2.add(ONE);
}
}
report("nextProbablePrime", failCount);
}
public void run() {
try {
BigInteger p = BigInteger.ONE;
while (!Thread.currentThread().isInterrupted()) queue.put(p = p.nextProbablePrime());
} catch (InterruptedException consumed) {
/* Allow thread to exit */
}
}
public static Set<BigInteger> createPrimesSet(int max) {
Set<BigInteger> primes = new HashSet<BigInteger>();
BigInteger n = new BigInteger("2");
BigInteger maxValue = new BigInteger(String.valueOf(max));
while (n.compareTo(maxValue) < 0) {
primes.add(n);
n = n.nextProbablePrime();
}
System.out.println("Primes under " + max + " generated.");
return primes;
}
static void largePrimesProduct(BigInteger a, BigInteger b, String c) {
BigInteger wp = a.multiply(b);
assertFalse(
"isProbablePrime failed for product of two large primes" + a + " * " + b + " = " + c,
wp.isProbablePrime(80));
BigInteger wpMinusOne = wp.subtract(BigInteger.ONE);
BigInteger next = wpMinusOne.nextProbablePrime();
// System.out.println(c);
// System.out.println(next);
assertTrue(
"nextProbablePrime returns wrong number: " + next + "instead of expected: " + c,
next.toString().equals(c));
}
public static void main(String[] args) {
// Generics, varargs & boxing working together:
List<Integer> li = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
Integer result = reduce(li, new IntegerAdder());
print(result);
result = reduce(li, new IntegerSubtracter());
print(result);
print(filter(li, new GreaterThan<Integer>(4)));
print(forEach(li, new MultiplyingIntegerCollector()).result());
print(
forEach(filter(li, new GreaterThan<Integer>(4)), new MultiplyingIntegerCollector())
.result());
MathContext mc = new MathContext(7);
List<BigDecimal> lbd =
Arrays.asList(
new BigDecimal(1.1, mc),
new BigDecimal(2.2, mc),
new BigDecimal(3.3, mc),
new BigDecimal(4.4, mc));
BigDecimal rbd = reduce(lbd, new BigDecimalAdder());
print(rbd);
print(filter(lbd, new GreaterThan<BigDecimal>(new BigDecimal(3))));
// Use the prime-generation facility of BigInteger:
List<BigInteger> lbi = new ArrayList<BigInteger>();
BigInteger bi = BigInteger.valueOf(11);
for (int i = 0; i < 11; i++) {
lbi.add(bi);
bi = bi.nextProbablePrime();
}
print(lbi);
BigInteger rbi = reduce(lbi, new BigIntegerAdder());
print(rbi);
// The sum of this list of primes is also prime:
print(rbi.isProbablePrime(5));
List<AtomicLong> lal =
Arrays.asList(
new AtomicLong(11), new AtomicLong(47), new AtomicLong(74), new AtomicLong(133));
AtomicLong ral = reduce(lal, new AtomicLongAdder());
print(ral);
print(transform(lbd, new BigDecimalUlp()));
}
/**
* Get the value of a JE property that is mapped to a configuration attribute.
*
* @param cfg The configuration containing the property values.
* @param attrName The configuration attribute type name.
* @return The string value of the JE property.
*/
private static String getPropertyValue(BackendCfg cfg, String attrName, ByteString backendId) {
try {
PropertyDefinition<?> propDefn = jebDefnMap.get(attrName);
Method method = jebMethodMap.get(attrName);
if (propDefn instanceof DurationPropertyDefinition) {
Long value = (Long) method.invoke(cfg);
// JE durations are in microseconds so we must convert.
DurationPropertyDefinition durationPropDefn = (DurationPropertyDefinition) propDefn;
value = 1000 * durationPropDefn.getBaseUnit().toMilliSeconds(value);
return String.valueOf(value);
} else {
Object value = method.invoke(cfg);
if (value != null) {
return String.valueOf(value);
}
if (attrName.equals(ATTR_NUM_CLEANER_THREADS)) {
// Automatically choose based on the number of processors. We will use
// similar heuristics to those used to define the default number of
// worker threads.
value = Platform.computeNumberOfThreads(8, 1.0f);
logger.debug(INFO_ERGONOMIC_SIZING_OF_JE_CLEANER_THREADS, backendId, (Number) value);
} else if (attrName.equals(ATTR_NUM_LOCK_TABLES)) {
// Automatically choose based on the number of processors. We'll assume that the user has
// also allowed
// automatic configuration of cleaners and workers.
BigInteger tmp = BigInteger.valueOf(Platform.computeNumberOfThreads(1, 2));
value = tmp.nextProbablePrime();
logger.debug(INFO_ERGONOMIC_SIZING_OF_JE_LOCK_TABLES, backendId, (Number) value);
}
return String.valueOf(value);
}
} catch (Exception e) {
logger.traceException(e);
return "";
}
}
public static void prime() {
BigInteger p1, p2, c1;
int failCount = 0;
// Test consistency
for (int i = 0; i < 10; i++) {
p1 = BigInteger.probablePrime(100, rnd);
if (!p1.isProbablePrime(100)) {
System.err.println("Consistency " + p1.toString(16));
failCount++;
}
}
// Test some known Mersenne primes (2^n)-1
// The array holds the exponents, not the numbers being tested
for (int i = 0; i < NUM_MERSENNES_TO_TEST; i++) {
p1 = new BigInteger("2");
p1 = p1.pow(mersenne_powers[i]);
p1 = p1.subtract(BigInteger.ONE);
if (!p1.isProbablePrime(100)) {
System.err.println("Mersenne prime " + i + " failed.");
failCount++;
}
}
// Test some primes reported by customers as failing in the past
for (int i = 0; i < customer_primes.length; i++) {
p1 = new BigInteger(customer_primes[i]);
if (!p1.isProbablePrime(100)) {
System.err.println("Customer prime " + i + " failed.");
failCount++;
}
}
// Test some known Carmichael numbers.
for (int i = 0; i < carmichaels.length; i++) {
c1 = BigInteger.valueOf(carmichaels[i]);
if (c1.isProbablePrime(100)) {
System.err.println("Carmichael " + i + " reported as prime.");
failCount++;
}
}
// Test some computed Carmichael numbers.
// Numbers of the form (6k+1)(12k+1)(18k+1) are Carmichael numbers if
// each of the factors is prime
int found = 0;
BigInteger f1 = new BigInteger(40, 100, rnd);
while (found < NUM_CARMICHAELS_TO_TEST) {
BigInteger k = null;
BigInteger f2, f3;
f1 = f1.nextProbablePrime();
BigInteger[] result = f1.subtract(ONE).divideAndRemainder(SIX);
if (result[1].equals(ZERO)) {
k = result[0];
f2 = k.multiply(TWELVE).add(ONE);
if (f2.isProbablePrime(100)) {
f3 = k.multiply(EIGHTEEN).add(ONE);
if (f3.isProbablePrime(100)) {
c1 = f1.multiply(f2).multiply(f3);
if (c1.isProbablePrime(100)) {
System.err.println("Computed Carmichael " + c1.toString(16));
failCount++;
}
found++;
}
}
}
f1 = f1.add(TWO);
}
// Test some composites that are products of 2 primes
for (int i = 0; i < 50; i++) {
p1 = BigInteger.probablePrime(100, rnd);
p2 = BigInteger.probablePrime(100, rnd);
c1 = p1.multiply(p2);
if (c1.isProbablePrime(100)) {
System.err.println("Composite failed " + c1.toString(16));
failCount++;
}
}
for (int i = 0; i < 4; i++) {
p1 = BigInteger.probablePrime(600, rnd);
p2 = BigInteger.probablePrime(600, rnd);
c1 = p1.multiply(p2);
if (c1.isProbablePrime(100)) {
System.err.println("Composite failed " + c1.toString(16));
failCount++;
}
}
report("Prime", failCount);
}