List of usage examples for java.util Random setSeed
public synchronized void setSeed(long seed)
From source file:org.apache.hadoop.mapred.gridmix.TestGridmixRecord.java
static void binSortTest(GridmixRecord x, GridmixRecord y, int min, int max, WritableComparator cmp) throws Exception { final Random r = new Random(); final long s = r.nextLong(); r.setSeed(s); LOG.info("sort: " + s); final DataOutputBuffer out1 = new DataOutputBuffer(); final DataOutputBuffer out2 = new DataOutputBuffer(); for (int i = min; i < max; ++i) { final long seed1 = r.nextLong(); setSerialize(x, seed1, i, out1); assertEquals(0, x.compareSeed(seed1, Math.max(0, i - x.fixedBytes()))); final long seed2 = r.nextLong(); setSerialize(y, seed2, i, out2); assertEquals(0, y.compareSeed(seed2, Math.max(0, i - x.fixedBytes()))); // for eq sized records, ensure byte cmp where req final int chk = WritableComparator.compareBytes(out1.getData(), 0, out1.getLength(), out2.getData(), 0, out2.getLength());/* www . jav a 2 s . c om*/ assertEquals(chk, x.compareTo(y)); assertEquals(chk, cmp.compare(out1.getData(), 0, out1.getLength(), out2.getData(), 0, out2.getLength())); // write second copy, compare eq final int s1 = out1.getLength(); x.write(out1); assertEquals(0, cmp.compare(out1.getData(), 0, s1, out1.getData(), s1, out1.getLength() - s1)); final int s2 = out2.getLength(); y.write(out2); assertEquals(0, cmp.compare(out2.getData(), 0, s2, out2.getData(), s2, out2.getLength() - s2)); assertEquals(chk, cmp.compare(out1.getData(), 0, s1, out2.getData(), s2, out2.getLength() - s2)); } }
From source file:org.apache.hadoop.mapred.gridmix.TestGridmixRecord.java
static void checkSpec(GridmixKey a, GridmixKey b) throws Exception { final Random r = new Random(); final long s = r.nextLong(); r.setSeed(s); LOG.info("spec: " + s); final DataInputBuffer in = new DataInputBuffer(); final DataOutputBuffer out = new DataOutputBuffer(); a.setType(GridmixKey.REDUCE_SPEC);// www.jav a2 s.c o m b.setType(GridmixKey.REDUCE_SPEC); for (int i = 0; i < 100; ++i) { final int in_rec = r.nextInt(Integer.MAX_VALUE); a.setReduceInputRecords(in_rec); final int out_rec = r.nextInt(Integer.MAX_VALUE); a.setReduceOutputRecords(out_rec); final int out_bytes = r.nextInt(Integer.MAX_VALUE); a.setReduceOutputBytes(out_bytes); final int min = WritableUtils.getVIntSize(in_rec) + WritableUtils.getVIntSize(out_rec) + WritableUtils.getVIntSize(out_bytes); assertEquals(min + 2, a.fixedBytes()); // meta + vint min final int size = r.nextInt(1024) + a.fixedBytes() + 1; setSerialize(a, r.nextLong(), size, out); assertEquals(size, out.getLength()); assertTrue(a.equals(a)); assertEquals(0, a.compareTo(a)); in.reset(out.getData(), 0, out.getLength()); b.readFields(in); assertEquals(size, b.getSize()); assertEquals(in_rec, b.getReduceInputRecords()); assertEquals(out_rec, b.getReduceOutputRecords()); assertEquals(out_bytes, b.getReduceOutputBytes()); assertTrue(a.equals(b)); assertEquals(0, a.compareTo(b)); assertEquals(a.hashCode(), b.hashCode()); } }
From source file:org.apache.kylin.cube.inmemcubing.InMemCubeBuilderTest.java
static void feedData(final CubeInstance cube, final String flatTable, ArrayBlockingQueue<List<String>> queue, int count, long randSeed) throws IOException, InterruptedException { CubeJoinedFlatTableDesc flatTableDesc = new CubeJoinedFlatTableDesc(cube.getDescriptor(), null); int nColumns = flatTableDesc.getColumnList().size(); @SuppressWarnings("unchecked") Set<String>[] distinctSets = new Set[nColumns]; for (int i = 0; i < nColumns; i++) distinctSets[i] = new TreeSet<String>(); // get distinct values on each column List<String> lines = FileUtils.readLines(new File(flatTable), "UTF-8"); for (String line : lines) { String[] row = line.trim().split(","); assert row.length == nColumns; for (int i = 0; i < nColumns; i++) distinctSets[i].add(row[i]); }//from w w w . j a v a 2 s. c o m List<String[]> distincts = new ArrayList<String[]>(); for (int i = 0; i < nColumns; i++) { distincts.add((String[]) distinctSets[i].toArray(new String[distinctSets[i].size()])); } Random rand = new Random(); if (randSeed != 0) rand.setSeed(randSeed); // output with random data for (; count > 0; count--) { ArrayList<String> row = new ArrayList<String>(nColumns); for (int i = 0; i < nColumns; i++) { String[] candidates = distincts.get(i); row.add(candidates[rand.nextInt(candidates.length)]); } queue.put(row); } queue.put(new ArrayList<String>(0)); }
From source file:org.apache.kylin.cube.inmemcubing.ITInMemCubeBuilderTest.java
static void feedData(final CubeInstance cube, final String flatTable, ArrayBlockingQueue<List<String>> queue, int count, long randSeed) throws IOException, InterruptedException { IJoinedFlatTableDesc flatDesc = EngineFactory.getJoinedFlatTableDesc(cube.getDescriptor()); int nColumns = flatDesc.getAllColumns().size(); @SuppressWarnings("unchecked") Set<String>[] distinctSets = new Set[nColumns]; for (int i = 0; i < nColumns; i++) distinctSets[i] = new TreeSet<String>(); // get distinct values on each column List<String> lines = FileUtils.readLines(new File(flatTable), "UTF-8"); for (String line : lines) { String[] row = line.trim().split(","); assert row.length == nColumns; for (int i = 0; i < nColumns; i++) distinctSets[i].add(row[i]); }//from ww w . j a v a2 s . c o m List<String[]> distincts = new ArrayList<String[]>(); for (int i = 0; i < nColumns; i++) { distincts.add((String[]) distinctSets[i].toArray(new String[distinctSets[i].size()])); } Random rand = new Random(); if (randSeed != 0) rand.setSeed(randSeed); // output with random data for (; count > 0; count--) { ArrayList<String> row = new ArrayList<String>(nColumns); for (int i = 0; i < nColumns; i++) { String[] candidates = distincts.get(i); row.add(candidates[rand.nextInt(candidates.length)]); } queue.put(row); } queue.put(new ArrayList<String>(0)); }
From source file:com.sonicle.webtop.core.util.IdentifierUtils.java
/** * @deprecated use com.sonicle.commons.IdentifierUtils.getRandomAlphaNumericString instead * @return/*from ww w.j ava 2 s. c om*/ */ @Deprecated public static synchronized String getRandomAlphaNumericString(int length) { try { SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); Random rand = new Random(); char buff[] = new char[length]; for (int i = 0; i < length; ++i) { // reseed rand once you've used up all available entropy bits if ((i % 10) == 0) rand.setSeed(sr.nextLong()); // 64 bits of random! buff[i] = VALID_CHARACTERS[rand.nextInt(VALID_CHARACTERS.length)]; } return new String(buff); } catch (NoSuchAlgorithmException ex) { return null; } }
From source file:org.apache.accumulo.server.test.TestIngest.java
public static byte[] genRandomValue(Random random, byte dest[], int seed, int row, int col) { random.setSeed((row ^ seed) ^ col); random.nextBytes(dest);/* w ww.j a v a2 s. c om*/ toPrintableChars(dest); return dest; }
From source file:net.sf.keystore_explorer.crypto.privatekey.Pkcs8Util.java
private static int generateIterationCount() { // Generate a random iteration count in range 1000-1999 Random rng = new Random(); rng.setSeed(Calendar.getInstance().getTimeInMillis()); int random = rng.nextInt(); int mod1000 = random % 1000; return mod1000 + 1000; }
From source file:net.sf.keystore_explorer.crypto.privatekey.Pkcs8Util.java
private static byte[] generateSalt() { // Generate random 8-bit salt Random random = new Random(); random.setSeed(Calendar.getInstance().getTimeInMillis()); byte[] salt = new byte[8]; random.nextBytes(salt);//from w ww. ja va 2 s . c om return salt; }
From source file:org.apache.mnemonic.Utils.java
/** * create a new instance of Random/* ww w.ja v a 2 s . co m*/ * * @param rgenseed * specify a random seed * * @return the instance of Random */ public static Random createRandom(long rgenseed) { Random ret = new Random(); if (0L == rgenseed) { rgenseed = System.currentTimeMillis(); System.out.println("Random number generator seed is " + rgenseed); } else { System.out.println("Fixed Random number generator seed is " + rgenseed); } ret.setSeed(rgenseed); return ret; }
From source file:com.github.nlloyd.hornofmongo.MongoScope.java
public static void _srand(Context cx, Scriptable thisObj, Object[] args, Function funObj) { Random randomGen = threadLocalRandomGen.get(); if (args[0] instanceof Long) randomGen.setSeed((Long) args[0]); else/* ww w . jav a 2 s .co m*/ randomGen.setSeed(Double.valueOf(args[0].toString()).longValue()); }