List of usage examples for java.util.concurrent ThreadLocalRandom current
public static ThreadLocalRandom current()
From source file:io.hops.hopsworks.common.dao.rstudio.RStudioSettingsFacade.java
public RStudioSettings findByProjectUser(int projectId, String email) { RStudioSettingsPK pk = new RStudioSettingsPK(projectId, email); RStudioSettings js = null;/*from ww w . j a va2s .com*/ js = em.find(RStudioSettings.class, pk); if (js == null) { String secret = DigestUtils.sha256Hex(Integer.toString(ThreadLocalRandom.current().nextInt())); js = new RStudioSettings(pk); js.setSecret(secret); js.setMode("sparkDynamic"); persist(js); } return js; }
From source file:org.apache.hadoop.hdfs.TestLeaseRecoveryStriped.java
private static int[][][] getBlockLengthsSuite() { final int groups = 4; final int minNumCell = 3; final int maxNumCell = 11; final int minNumDelta = -4; final int maxNumDelta = 2; int delta = 0; int[][][] blkLenSuite = new int[groups][][]; Random random = ThreadLocalRandom.current(); for (int i = 0; i < blkLenSuite.length; i++) { if (i == blkLenSuite.length - 1) { delta = bytesPerChecksum;/*from ww w . ja v a2 s . c o m*/ } int[][] suite = new int[2][]; int[] lens = new int[NUM_DATA_BLOCKS + NUM_PARITY_BLOCKS]; long[] lenInLong = new long[lens.length]; for (int j = 0; j < lens.length; j++) { int numCell = random.nextInt(maxNumCell - minNumCell + 1) + minNumCell; int numDelta = j < NUM_DATA_BLOCKS ? random.nextInt(maxNumDelta - minNumDelta + 1) + minNumDelta : 0; lens[j] = CELL_SIZE * numCell + delta * numDelta; lenInLong[j] = lens[j]; } suite[0] = lens; suite[1] = new int[] { (int) StripedBlockUtil.getSafeLength(ecPolicy, lenInLong) }; blkLenSuite[i] = suite; } return blkLenSuite; }
From source file:org.lambda3.indra.service.mock.MockedNeighborsResourceImpl.java
private Set<String> getRandomWords() { Set<String> results = new HashSet<>(); int n = ThreadLocalRandom.current().nextInt(1, 8); for (int i = 0; i < n; i++) { int index = ThreadLocalRandom.current().nextInt(0, NEIGHBORS.size()); results.add(NEIGHBORS.get(index)); }//from ww w. ja va 2 s . co m return results; }
From source file:com.facebook.presto.operator.aggregation.BootstrappedAggregation.java
@Override public Accumulator createIntermediateAggregation(double confidence) { return createDeterministicIntermediateAggregation(confidence, ThreadLocalRandom.current().nextLong()); }
From source file:org.apache.druid.indexing.common.task.RealtimeIndexTask.java
public static String makeRandomId() { final StringBuilder suffix = new StringBuilder(TASK_ID_LENGTH); int randomBits = ThreadLocalRandom.current().nextInt(); for (int i = 0; i < TASK_ID_LENGTH; i++) { suffix.append((char) ('a' + ((randomBits >>> (i * TASK_ID_BITS_PER_SYMBOL)) & TASK_ID_SYMBOL_MASK))); }/*w w w.j a v a2 s . c om*/ return suffix.toString(); }
From source file:org.verdictdb.sqlwriter.CreateTableToSql.java
private String createImpalaPartitionTableToSql(CreateScrambledTableQuery query) throws VerdictDBException { // 1. This method should only get called when the target DB is Impala. // 2. Currently, Impala's create-table-as-select has a bug; dynamic partitioning is faulty // when used in conjunction with rand(); if (!(syntax instanceof ImpalaSyntax)) { throw new VerdictDBException("Target database must be Impala."); }//from w w w . j a va 2 s.c o m StringBuilder sql = new StringBuilder(); String schemaName = query.getSchemaName(); String tableName = query.getTableName(); SelectQuery select = query.getSelect(); // this table will be created and dropped at the end int randomNum = ThreadLocalRandom.current().nextInt(0, 10000); String tempTableName = "verdictdb_scrambling_temp_" + randomNum; // create a non-partitioned temp table as a select CreateTableAsSelectQuery tempCreate = new CreateTableAsSelectQuery(schemaName, tempTableName, select); sql.append(QueryToSql.convert(syntax, tempCreate)); sql.append(";"); // insert the temp table into a partitioned table. String aliasName = "t"; SelectQuery selectAllFromTemp = SelectQuery.create(new AsteriskColumn(), new BaseTable(schemaName, tempTableName, aliasName)); CreateTableAsSelectQuery insert = new CreateTableAsSelectQuery(schemaName, tableName, selectAllFromTemp); for (String col : query.getPartitionColumns()) { insert.addPartitionColumn(col); } sql.append(QueryToSql.convert(syntax, insert)); sql.append(";"); // drop the temp table DropTableQuery drop = new DropTableQuery(schemaName, tempTableName); sql.append(QueryToSql.convert(syntax, drop)); sql.append(";"); return sql.toString(); }
From source file:com.nesscomputing.quartz.QuartzJob.java
/** * Set the time-of-day when the first run of the job will take place. *//*from ww w . j a va 2 s . c o m*/ @SuppressWarnings("unchecked") public final SelfType startTime(final DateTime when, final TimeSpan jitter) { // Find the current week day in the same time zone as the "when" time passed in. final DateTime now = new DateTime().withZone(when.getZone()); final int startWeekDay = when.getDayOfWeek(); final int currentWeekDay = now.getDayOfWeek(); // ( x + n ) % n is x for x > 0 and n - x for x < 0. final int daysTilStart = (startWeekDay - currentWeekDay + DAYS_PER_WEEK) % DAYS_PER_WEEK; Preconditions.checkState(daysTilStart >= 0 && daysTilStart < DAYS_PER_WEEK, "daysTilStart must be 0..%s, but is %s", DAYS_PER_WEEK, daysTilStart); // same trick as above, add a full week in millis and do the modulo. final long millisecondsTilStart = (when.getMillisOfDay() - now.getMillisOfDay() + daysTilStart * MILLIS_PER_DAY + MILLIS_PER_WEEK) % MILLIS_PER_WEEK; Preconditions.checkState(millisecondsTilStart >= 0 && millisecondsTilStart < MILLIS_PER_WEEK, "millisecondsTilStart must be 0..%s, but is %s", MILLIS_PER_WEEK, millisecondsTilStart); this.delay = Duration.millis( (long) (ThreadLocalRandom.current().nextDouble() * jitter.getMillis()) + millisecondsTilStart); return (SelfType) this; }
From source file:org.workspace7.moviestore.utils.MovieDBHelper.java
/** * This method queries the external API and caches the movies, for the demo purpose we just query only first page * * @return - the status code of the invocation */// w ww . j a va2 s. c o m protected int queryAndCache() { if (this.moviesCache.isEmpty()) { log.info("No movies exist in cache, loading cache .."); UriComponentsBuilder moviesUri = UriComponentsBuilder .fromUriString(movieStoreProps.getApiEndpointUrl() + "/movie/popular") .queryParam("api_key", movieStoreProps.getApiKey()); final URI requestUri = moviesUri.build().toUri(); log.info("Request URI:{}", requestUri); ResponseEntity<String> response = restTemplate.getForEntity(requestUri, String.class); log.info("Response Status:{}", response.getStatusCode()); Map<String, Movie> movieMap = new HashMap<>(); if (200 == response.getStatusCode().value()) { String jsonBody = response.getBody(); ObjectMapper objectMapper = new ObjectMapper(); try { JsonNode root = objectMapper.readTree(jsonBody); JsonNode results = root.path("results"); results.elements().forEachRemaining(movieNode -> { String id = movieNode.get("id").asText(); Movie movie = Movie.builder().id(id).overview(movieNode.get("overview").asText()) .popularity(movieNode.get("popularity").floatValue()) .posterPath("http://image.tmdb.org/t/p/w92" + movieNode.get("poster_path").asText()) .logoPath("http://image.tmdb.org/t/p/w45" + movieNode.get("poster_path").asText()) .title(movieNode.get("title").asText()) .price(ThreadLocalRandom.current().nextDouble(1.0, 10.0)).build(); movieMap.put(id, movie); }); } catch (IOException e) { log.error("Error reading response:", e); } log.debug("Got {} movies", movieMap); moviesCache.putAll(movieMap); } return response.getStatusCode().value(); } else { log.info("Cache already loaded with movies ... will use cache"); return 200; } }
From source file:com.facebook.presto.operator.aggregation.AbstractTestApproximateCountDistinct.java
@Test(dataProvider = "provideStandardErrors") public void testMultiplePositionsPartial(double maxStandardError) throws Exception { for (int i = 0; i < 100; ++i) { int uniques = ThreadLocalRandom.current().nextInt(20000) + 1; List<Object> values = createRandomSample(uniques, (int) (uniques * 1.5)); assertEquals(estimateCountPartial(values, maxStandardError), estimateGroupByCount(values, maxStandardError)); }//from w w w. jav a 2 s . co m }
From source file:org.apache.phoenix.loadbalancer.service.LoadBalancer.java
/** * It returns the location of Phoenix Query Server * in form of Guava <a href="https://google.github.io/guava/releases/19.0/api/docs/com/google/common/net/HostAndPort.html">HostAndPort</a> * from the cache. The client should catch Exception incase * the method is unable to fetch PQS location due to network failure or * in-correct configuration issues./*www. jav a 2 s. c o m*/ * @return - return Guava HostAndPort. See <a href="http://google.com">http://google.com</a> * @throws Exception */ public HostAndPort getSingleServiceLocation() throws Exception { List<HostAndPort> childNodes = conductSanityCheckAndReturn(); // get an random connect string int i = ThreadLocalRandom.current().nextInt(0, childNodes.size()); return childNodes.get(i); }