Example usage for java.util Collections shuffle

List of usage examples for java.util Collections shuffle

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Introduction

In this page you can find the example usage for java.util Collections shuffle.

Prototype

public static void shuffle(List<?> list)

Source Link

Document

Randomly permutes the specified list using a default source of randomness.

Usage

From source file:com.netflix.simianarmy.basic.chaos.BasicChaosInstanceSelector.java

private Collection<String> selectNInstances(Collection<String> instances, int n, String selected) {
    logger().info("Randomly selecting {} from {} instances, excluding {}",
            new Object[] { n, instances.size(), selected });
    List<String> copy = Lists.newArrayList();
    for (String instance : instances) {
        if (!instance.equals(selected)) {
            copy.add(instance);/*  w  ww  .ja  v  a 2 s . c om*/
        }
    }
    if (n >= copy.size()) {
        return copy;
    }
    Collections.shuffle(copy);
    return copy.subList(0, n);
}

From source file:com.pinterest.teletraan.worker.HotfixStateTransitioner.java

void processBatch() throws Exception {
    // Get all current deploys, randomly pick one to work on
    List<String> hotfixIds = hotfixDAO.getOngoingHotfixIds();
    if (hotfixIds.isEmpty()) {
        LOG.info("HotfixStateTransitioner did not find any active hotfix, exiting.");
        return;/*w w w  . j  av a2 s . c  o m*/
    }
    Collections.shuffle(hotfixIds);
    for (String hotfixId : hotfixIds) {
        HotfixBean hotBean = hotfixDAO.getByHotfixId(hotfixId);
        try {
            LOG.info("HotfixStateTransitioner chooses hotfix {} to work on.", hotfixId);
            transitionHotfixState(hotBean);
        } catch (Throwable t) {
            // Catch all throwable so that subsequent job not suppressed, also long error in DB
            LOG.error("HotfixStateTransitioner failed to process {} " + hotfixId, t);
        }
    }
}

From source file:org.berlin.crawl.bom.StartURLSeedReader.java

public void launch() {
    final ApplicationContext ctx = new ClassPathXmlApplicationContext(
            "/org/berlin/batch/batch-databot-context.xml");
    final BotCrawlerDAO dao = new BotCrawlerDAO();
    final SessionFactory sf = (SessionFactory) ctx.getBean("sessionFactory");
    final Session session = sf.openSession();
    final List<BotSeed> seeds = dao.findSeedRequests(session);
    int numberOfSeeds = 0;

    // Randomize the seed list //      
    Collections.shuffle(seeds);
    for (final BotSeed seed : seeds) {
        if ("Y".equalsIgnoreCase(seed.getEnabled())) {
            numberOfSeeds++;/*from  ww w.j a v a 2  s  .  co  m*/
            if (this.activeThreads.size() < maxActiveThreads) {
                logger.info("At Start URL Seeder, seeding / num=" + numberOfSeeds + " / " + seed.getId()
                        + " sz=" + this.activeThreads.size());
                // Only launch so many threads               
                final BotTrueCrawler crawl = new BotTrueCrawler(this, ctx, seed.toLink());
                crawl.launch();
                // Slight delay after producing the links for processing //
                try {
                    Thread.sleep(BotTrueCrawler.DELAY_FROM_PRODUCER + (4 * 1000));
                } catch (final InterruptedException e) {
                    e.printStackTrace();
                } /// End of try catch //
            } else {
                // Wait for the threads to finish, using join
                for (final Thread wt : this.activeThreads) {
                    try {
                        logger.info("At Start URL Seeder, waiting on seeds to complete");
                        wt.join();
                    } catch (final InterruptedException e) {
                        e.printStackTrace();
                    }
                } // End of the for //
                  // If we reached this point, remove all the threads , they finished processing
                if (this.activeThreads.size() > 0) {
                    this.activeThreads.clear();
                }
            } // End of the if - else //            
            logger.info("!/=! At END OF seed launching, seeding / num=" + numberOfSeeds + " / " + seed.getId());
        } // End of the if //
    } // End of the for //

    // Wait for the threads to finish, using join
    for (final Thread wt : this.activeThreads) {
        try {
            logger.info("At Start URL Seeder, waiting on seeds to complete [f66x0");
            wt.join();
        } catch (final InterruptedException e) {
            e.printStackTrace();
        }
    } // End of the for //

    logger.info("!/=! At END OF seed seeding, launch complete");
    if (session != null) {
        // May not need to close the session
        session.close();
    } // End of the if //
}

From source file:com.jonschang.ai.ga.SpringGeneticAlgFactory.java

@Override
public G newGene() throws GeneticAlgException {
    Collections.shuffle(genes);
    return newGene(genes.get(0));
}

From source file:czlab.xlib.CU.java

/**
 * Shuffle characters in this string.//from   w ww  .  ja v  a 2  s. c  om
 *
 * @param s
 * @return
 */
public static String shuffle(String s) {
    List<Character> lst = new ArrayList<>();
    char[] cs = s.toCharArray();
    for (int n = 0; n < cs.length; ++n) {
        lst.add(cs[n]);
    }
    Collections.shuffle(lst);
    for (int n = 0; n < lst.size(); ++n) {
        cs[n] = lst.get(n).charValue();
    }
    return new String(cs);
}

From source file:com.music.scheduled.PieceDigestSendingJob.java

@Scheduled(cron = "0 0 9 ? * 1,4")
@Transactional(readOnly = true)/* ww  w  . j a va2s  . c  om*/
public void sendPieceDigestEmails() {
    logger.info("Sending email digests started");
    DateTime now = new DateTime();
    DateTime minusTwoDays = now.minusDays(2);
    List<Piece> pieces = pieceDao.getPiecesInRange(minusTwoDays, now);
    Collections.shuffle(pieces);
    final List<Piece> includedPieces = new ArrayList<>(pieces.subList(0, Math.min(pieces.size(), 3)));
    if (includedPieces.isEmpty()) {
        return;
    }
    // for now - using the same data for all users. TODO send personalized selection
    final EmailDetails baseDetails = new EmailDetails();
    baseDetails.setMessageTemplate("digest.vm");
    baseDetails.setSubject("Computoser-generated tracks digest for you");
    Map<String, Object> model = Maps.newHashMap();
    baseDetails.setMessageTemplateModel(model);
    baseDetails.setFrom(from);
    baseDetails.setHtml(true);
    userDao.performBatched(User.class, 100, new PageableOperation<User>() {
        @Override
        public void execute() {
            for (User user : getData()) {
                if (user.isReceiveDailyDigest() && StringUtils.isNotBlank(user.getEmail())) {
                    EmailDetails email = SerializationUtils.clone(baseDetails);
                    email.setTo(user.getEmail());
                    email.setCurrentUser(user);
                    String hmac = SecurityUtils.hmac(user.getEmail(), hmacKey);
                    email.getMessageTemplateModel().put("pieces", includedPieces);
                    email.getMessageTemplateModel().put("hmac", hmac);
                    // needed due to SES restrictions
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        throw new IllegalStateException(e);
                    }
                    emailService.send(email);
                }
            }
        }
    });
}

From source file:dk.statsbiblioteket.alto.AnagramHashingTest.java

public void disabledTestGenerateSampleWords() throws IOException {
    final int CHUNK = 100;

    List<String> words = new ArrayList<String>(100000);
    AnagramHashing te = new AnagramHashing();
    List<File> altos = new ArrayList<File>();
    te.getALTOs(altos, getInputFolder());
    for (File alto : altos) {
        log.debug("Processing ALTO " + alto);
        for (String ts : te.splitAndPrune(te.getStrings(alto))) {
            words.add(ts);/*www  .j  av  a 2s . c o  m*/
        }
    }
    Collections.shuffle(words);

    int pos = 0;
    StringBuilder sb = new StringBuilder();
    while (pos < words.size()) {
        sb.setLength(0);
        sb.append("<String CONTENT=\"");
        int end = Math.min(words.size(), pos + CHUNK);
        for (int i = pos; i < end; i++) {
            if (i > pos) {
                sb.append(' ');
            }
            sb.append(words.get(i).replace("&", "&amp;").replace("'", "&apos;").replace("\"", "&quot;")
                    .replace("<", "&lt;").replace(">", "&gt;"));
        }
        sb.append("\"/>");
        System.out.println(sb.toString());
        pos = end;
    }
}

From source file:com.facebook.hiveio.options.NamespaceOptions.java

/**
 * Read metastore information from file path
 *
 * @return HostPort of metastore/* w  w  w.j a v  a2 s .  co m*/
 * @throws IOException
 */
public HostPort readMetastoreInfo() throws IOException {
    if (path == null) {
        LOG.error("Cluster file not given");
        new Help().run();
        return null;
    }
    ObjectMapper objectMapper = new ObjectMapper();
    File file = new File(path);
    NamespaceData clustersData = objectMapper.readValue(file, NamespaceData.class);
    List<HostPort> hostAndPorts = clustersData.data.get(name);
    if (hostAndPorts == null) {
        LOG.error("Cluster {} not found in data file {}", name, path);
        return null;
    }
    Collections.shuffle(hostAndPorts);
    return hostAndPorts.get(0);
}

From source file:com.example.bidisha.ace.ClueScan.java

/***
 * @mitra00/*from  w ww. ja va2 s  . c  o m*/
 * function to generate the random clues
 * @param //savedInstanceState
 */
void gen_clues() {
    /**
     * @mitra00
     * creatiing the random clues array
     */
    ArrayList<Integer> list = new ArrayList<Integer>();
    for (int ii = 0; ii < 19; ii++) {
        list.add(new Integer(ii));
    }
    Collections.shuffle(list);
    for (int ii = 0; ii < 10; ii++) {
        //System.out.println(list.get(i));
        rando[ii] = clues[list.get(ii)];
        //Toast.makeText(ClueScan.this,rando[ii],Toast.LENGTH_LONG).show();

    }
    //first clue same for all
    rando[0] = "This app was recently inaugurated by Mysore MLA";
}

From source file:com.pinterest.teletraan.worker.AutoPromoter.java

void processBatch() throws Exception {
    // Get all auto_promote enabled & normal state envs, randomly pick one to work on
    List<String> envIds = promoteDAO.getAutoPromoteEnvIds();
    if (envIds.isEmpty()) {
        LOG.debug("AutoPromoter did not find any valid env to work on, exiting.");
        return;/*from  w w w. j  a  v a 2 s.  c o  m*/
    }
    Collections.shuffle(envIds);
    for (String envId : envIds) {
        try {
            LOG.debug("AutoPromoter chooses env {} to work on.", envId);
            processOnce(envId);
        } catch (Throwable t) {
            // Catch all throwable so that subsequent job not suppressed
            LOG.error("AutoPromoter failed to process {}", envId, t);
        }
    }
}