List of usage examples for java.util Random nextBoolean
public boolean nextBoolean()
From source file:airport.dispatcher.weather.Humidity.java
@Override public void update() { if (value == MAX_DEGREE) { value--;//from ww w . ja v a2 s. c om return; } if (value == MIN_DEGREE) { value++; return; } Random random = new Random(); if (random.nextBoolean()) { value++; } else { value--; } if (LOG.isInfoEnabled()) { LOG.info("update Humidity. New value : " + value); } }
From source file:airport.dispatcher.weather.TemperatureCentigrade.java
@Override public void update() { if (degree == MAX_DEGREE) { degree--;/* ww w. j av a 2 s. c o m*/ return; } if (degree == MIN_DEGREE) { degree++; return; } Random random = new Random(); if (random.nextBoolean()) { degree++; } else { degree--; } if (LOG.isInfoEnabled()) { LOG.info("update. New value : " + degree); } }
From source file:org.zanata.webtrans.client.presenter.UserConfigHolderTest.java
@Test public void randomSetterAndGetter() throws Exception { Random random = new Random(System.nanoTime()); boolean value = random.nextBoolean(); configHolder.setEnterSavesApproved(value); configHolder.setDisplayButtons(value); configHolder.setShowError(value);/*from w w w . j a v a2s. c om*/ assertThat(configHolder.getState().isEnterSavesApproved()).isEqualTo(value); assertThat(configHolder.getState().isDisplayButtons()).isEqualTo(value); assertThat(configHolder.getState().isShowError()).isEqualTo(value); }
From source file:org.sonar.server.platform.db.migration.version.v65.DeleteCeWorkerCountSettingTest.java
public void insertProperty(String propertyName) { Random random = new Random(); db.executeInsert(TABLE_PROPERTIES, "prop_key", propertyName, "is_empty", valueOf(random.nextBoolean()), "text_value", random.nextBoolean() ? null : RandomStringUtils.randomAlphabetic(2)); }
From source file:com.samsung.sjs.theorysolver.TheorySolverTest.java
/** * This tests the {@link TheorySolver} using a theory which has a random set of * blacklisted objects. We verify that the TheorySolver always finds the entire * set of non-blacklisted objects.// w w w . jav a2 s. co m */ @Test public void testBasics() { List<Object> all = Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h"); for (int i = 0; i < 100; ++i) { Random r = new Random(SEED + i); Collection<Object> truthy = all.stream().filter(x -> r.nextBoolean()).collect(Collectors.toSet()); Theory<Object, Void> theory = positive -> { Collection<Object> bad = positive.stream().filter(x -> !truthy.contains(x)) .collect(Collectors.toSet()); if (bad.size() > 0) { // Construct a random, nonempty unsat core. Collection<Object> unsat = new HashSet<>(); unsat.add(bad.iterator().next()); bad.stream().filter(x -> r.nextBoolean()).forEach(unsat::add); return Either.right(unsat); } else { return Either.left(null); } }; Pair<Void, Collection<Object>> result = TheorySolver.solve(theory, new SatFixingSetFinder<>(new Sat4J()), Collections.emptyList(), all); Assert.assertEquals(all.size() - truthy.size(), result.getRight().size()); Assert.assertEquals(truthy, all.stream().filter(x -> !result.getRight().contains(x)).collect(Collectors.toSet())); } }
From source file:org.apache.solr.common.util.TestJavaBinCodec.java
public static void doDecodePerf(String[] args) throws Exception { int arg = 0;/* w w w. j a v a 2 s.c om*/ int nThreads = Integer.parseInt(args[arg++]); int nBuffers = Integer.parseInt(args[arg++]); final long iter = Long.parseLong(args[arg++]); int cacheSz = Integer.parseInt(args[arg++]); Random r = new Random(0); final byte[][] buffers = new byte[nBuffers][]; for (int bufnum = 0; bufnum < nBuffers; bufnum++) { SolrDocument sdoc = new SolrDocument(); sdoc.put("id", "my_id_" + bufnum); sdoc.put("author", str(r, 10 + r.nextInt(10))); sdoc.put("address", str(r, 20 + r.nextInt(20))); sdoc.put("license", str(r, 10)); sdoc.put("title", str(r, 5 + r.nextInt(10))); sdoc.put("modified_dt", r.nextInt(1000000)); sdoc.put("creation_dt", r.nextInt(1000000)); sdoc.put("birthdate_dt", r.nextInt(1000000)); sdoc.put("clean", r.nextBoolean()); sdoc.put("dirty", r.nextBoolean()); sdoc.put("employed", r.nextBoolean()); sdoc.put("priority", r.nextInt(100)); sdoc.put("dependents", r.nextInt(6)); sdoc.put("level", r.nextInt(101)); sdoc.put("education_level", r.nextInt(10)); // higher level of reuse for string values sdoc.put("state", "S" + r.nextInt(50)); sdoc.put("country", "Country" + r.nextInt(20)); sdoc.put("some_boolean", "" + r.nextBoolean()); sdoc.put("another_boolean", "" + r.nextBoolean()); buffers[bufnum] = getBytes(sdoc); } int ret = 0; final RTimer timer = new RTimer(); ConcurrentLRUCache underlyingCache = cacheSz > 0 ? new ConcurrentLRUCache<>(cacheSz, cacheSz - cacheSz / 10, cacheSz, cacheSz / 10, false, true, null) : null; // the cache in the first version of the patch was 10000,9000,10000,1000,false,true,null final JavaBinCodec.StringCache stringCache = underlyingCache == null ? null : new JavaBinCodec.StringCache(underlyingCache); if (nThreads <= 0) { ret += doDecode(buffers, iter, stringCache); } else { runInThreads(nThreads, () -> { try { doDecode(buffers, iter, stringCache); } catch (IOException e) { e.printStackTrace(); } }); } long n = iter * Math.max(1, nThreads); System.out.println("ret=" + ret + " THROUGHPUT=" + (n * 1000 / timer.getTime())); if (underlyingCache != null) System.out.println("cache: hits=" + underlyingCache.getStats().getCumulativeHits() + " lookups=" + underlyingCache.getStats().getCumulativeLookups() + " size=" + underlyingCache.getStats().getCurrentSize()); }
From source file:org.apache.tinkerpop.gremlin.neo4j.AbstractNeo4jGraphProvider.java
private void createIndices(final Neo4jGraph graph, final LoadGraphWith.GraphData graphData) { final Random random = new Random(); final boolean pick = random.nextBoolean(); if (graphData.equals(LoadGraphWith.GraphData.GRATEFUL)) { if (pick) { graph.tx().readWrite();//from w ww . j a va2 s . c o m if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :artist(name)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :song(name)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :song(songType)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :song(performances)").iterate(); graph.tx().commit(); } // else no indices } else if (graphData.equals(LoadGraphWith.GraphData.MODERN)) { if (pick) { graph.tx().readWrite(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :person(name)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :person(age)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :software(name)").iterate(); if (random.nextBoolean()) { graph.cypher("CREATE INDEX ON :software(lang)").iterate(); } graph.tx().commit(); } // else no indices } else if (graphData.equals(LoadGraphWith.GraphData.CLASSIC)) { if (pick) { graph.tx().readWrite(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :vertex(name)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :vertex(age)").iterate(); if (random.nextBoolean()) graph.cypher("CREATE INDEX ON :vertex(lang)").iterate(); graph.tx().commit(); } // else no indices } else { // TODO: add CREW work here. // TODO: add meta_property indices when meta_property graph is provided //throw new RuntimeException("Could not load graph with " + graphData); } }
From source file:org.apache.edgent.samples.utils.sensor.PeriodicRandomSensor.java
/** * Create a periodic sensor stream with readings from {@link Random#nextBoolean()}. * @param t the topology to add the sensor stream to * @param periodMsec how frequently to generate a reading * @return the sensor value stream//from w ww .j a v a 2 s . c om */ public TStream<Pair<Long, Boolean>> newBoolean(Topology t, long periodMsec) { Random r = newRandom(); return t.poll(() -> new Pair<Long, Boolean>(System.currentTimeMillis(), r.nextBoolean()), periodMsec, TimeUnit.MILLISECONDS); }
From source file:org.primefaces.extensions.showcase.controller.timeline.LazyTimelineController.java
private void generateRandomEvents(Date startDate, Date endDate, TimelineUpdater timelineUpdater) { Calendar cal = Calendar.getInstance(); Date curDate = startDate;// w ww .ja v a 2s .co m Random rnd = new Random(); while (curDate.before(endDate)) { // create events in the given time range if (rnd.nextBoolean()) { // event with only one date model.add(new TimelineEvent("Event " + RandomStringUtils.randomNumeric(5), curDate), timelineUpdater); } else { // event with start and end dates cal.setTimeInMillis(curDate.getTime()); cal.add(Calendar.HOUR, 18); model.add(new TimelineEvent("Event " + RandomStringUtils.randomNumeric(5), curDate, cal.getTime()), timelineUpdater); } cal.setTimeInMillis(curDate.getTime()); cal.add(Calendar.HOUR, 24); curDate = cal.getTime(); } }
From source file:org.vaadin.viritin.it.aspect.MTableLazyLoadingWithEntityAspect.java
@Override public Component getTestComponent() { Random r = new Random(0); final List<User> listOfPersons = Service.getListOfPersons(1000).stream().map(person -> { User u = new User(person); u.setLocale(r.nextBoolean() ? Locale.ENGLISH : Locale.FRENCH); return u; }).collect(Collectors.toList()); MTable<User> table = new MTable<>((firstRow, sortAscending, property) -> { if (property != null) { if (property.equals("localizedSalutation")) { Collections.sort(listOfPersons, new Comparator<User>() { @Override/* w ww.j a v a2s. c o m*/ public int compare(User o1, User o2) { return localizedSalutation(o1).compareTo(localizedSalutation(o2)); } }); } else { Collections.sort(listOfPersons, new BeanComparator<>(property)); } if (!sortAscending) { Collections.reverse(listOfPersons); } } int last = firstRow + LazyList.DEFAULT_PAGE_SIZE; if (last > listOfPersons.size()) { last = listOfPersons.size(); } return new ArrayList<User>(listOfPersons.subList(firstRow, last)); }, () -> (int) Service.count()) .withProperties("localizedSalutation", "locale", "person.firstName", "person.lastName") .withColumnHeaders("Salutation", "Locale", "Forename", "Name").withFullWidth() .withGeneratedColumn("localizedSalutation", u -> localizedSalutation(u)); return table; }