Example usage for java.util Collections shuffle

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:edu.cmu.tetrad.data.DataUtils.java

public static DataSet reorderColumns(DataSet dataModel) {
    List<Node> vars = new ArrayList<Node>();

    List<Node> variables = dataModel.getVariables();
    Collections.shuffle(variables);

    for (Node node : variables) {
        Node _node = dataModel.getVariable(node.getName());

        if (_node != null) {
            vars.add(_node);/*from   w  w  w.  j ava 2  s.c o  m*/
        }
    }

    return dataModel.subsetColumns(vars);
}

---

From source file:com.yahoo.pulsar.broker.loadbalance.impl.SimpleLoadManagerImpl.java

private Map<Long, Set<ResourceUnit>> getAvailableBrokers(ServiceUnitId serviceUnitId) throws Exception {
    Map<Long, Set<ResourceUnit>> availableBrokers = sortedRankings.get();

    // Normal case: we are the leader and we do have load reports information available

    if (availableBrokers.isEmpty()) {
        // Create a map with all available brokers with no load information
        Set<String> activeBrokers = availableActiveBrokers.get(LOADBALANCE_BROKERS_ROOT);
        List<String> brokersToShuffle = new ArrayList<>(activeBrokers);
        Collections.shuffle(brokersToShuffle);
        activeBrokers = new HashSet<>(brokersToShuffle);

        availableBrokers = Maps.newTreeMap();
        for (String broker : activeBrokers) {
            ResourceUnit resourceUnit = new SimpleResourceUnit(String.format("http://%s", broker),
                    new PulsarResourceDescription());
            availableBrokers.computeIfAbsent(0L, key -> Sets.newTreeSet()).add(resourceUnit);
        }/*from  w  w w.  j  a  va  2  s  .co m*/
        log.info("Choosing at random from broker list: [{}]", availableBrokers.values());
    }
    return availableBrokers;
}

---

From source file:edu.cmu.tetrad.data.DataUtils.java

public static List<DataSet> reorderColumns(List<DataSet> dataSets) {
    List<Node> vars = new ArrayList<Node>();

    List<Node> variables = dataSets.get(0).getVariables();
    Collections.shuffle(variables);

    for (Node node : variables) {
        Node _node = dataSets.get(0).getVariable(node.getName());

        if (_node != null) {
            vars.add(_node);//from w w  w.  ja  va2 s  .  co  m
        }
    }

    List<DataSet> ret = new ArrayList<DataSet>();

    for (DataSet m : dataSets) {
        ret.add(m.subsetColumns(vars));
    }

    return ret;
}

---

From source file:edu.cmu.tetrad.data.DataUtils.java

public static ICovarianceMatrix reorderColumns(ICovarianceMatrix cov) {
    List<String> vars = new ArrayList<String>();

    List<Node> variables = new ArrayList<Node>(cov.getVariables());
    Collections.shuffle(variables);

    for (Node node : variables) {
        Node _node = cov.getVariable(node.getName());

        if (_node != null) {
            vars.add(_node.getName());//  ww  w .j a  v  a 2s .c om
        }
    }

    return cov.getSubmatrix(vars);
}

---

From source file:com.cloud.storage.StorageManagerImpl.java

@Override
public Pair<Long, Answer[]> sendToPool(StoragePool pool, long[] hostIdsToTryFirst, List<Long> hostIdsToAvoid,
        Commands cmds) throws StorageUnavailableException {
    List<Long> hostIds = getUpHostsInPool(pool.getId());
    Collections.shuffle(hostIds);
    if (hostIdsToTryFirst != null) {
        for (int i = hostIdsToTryFirst.length - 1; i >= 0; i--) {
            if (hostIds.remove(hostIdsToTryFirst[i])) {
                hostIds.add(0, hostIdsToTryFirst[i]);
            }/*from   w w  w .  j  av  a2s. c o m*/
        }
    }

    if (hostIdsToAvoid != null) {
        hostIds.removeAll(hostIdsToAvoid);
    }
    if (hostIds == null || hostIds.isEmpty()) {
        throw new StorageUnavailableException("Unable to send command to the pool " + pool.getId()
                + " due to there is no enabled hosts up in this cluster", pool.getId());
    }
    for (Long hostId : hostIds) {
        try {
            List<Answer> answers = new ArrayList<Answer>();
            Command[] cmdArray = cmds.toCommands();
            for (Command cmd : cmdArray) {
                long targetHostId = _hvGuruMgr.getGuruProcessedCommandTargetHost(hostId, cmd);
                answers.add(_agentMgr.send(targetHostId, cmd));
            }
            return new Pair<Long, Answer[]>(hostId, answers.toArray(new Answer[answers.size()]));
        } catch (AgentUnavailableException e) {
            s_logger.debug("Unable to send storage pool command to " + pool + " via " + hostId, e);
        } catch (OperationTimedoutException e) {
            s_logger.debug("Unable to send storage pool command to " + pool + " via " + hostId, e);
        }
    }

    throw new StorageUnavailableException("Unable to send command to the pool ", pool.getId());
}

---

From source file:com.devicehive.service.UserServiceTest.java

@Test
@DirtiesContext(methodMode = DirtiesContext.MethodMode.BEFORE_METHOD)
public void should_return_list_of_users_sorted() throws Exception {
    String suffix = RandomStringUtils.randomAlphabetic(5);
    List<String> prefixes = Arrays.asList("a", "b", "c", "d", "e");
    Collections.shuffle(prefixes);
    for (String prefix : prefixes) {
        UserVO user = new UserVO();
        user.setLogin(prefix + "_" + suffix);
        user.setStatus(UserStatus.ACTIVE);
        userService.createUser(user, RandomStringUtils.randomAlphabetic(10));
    }//from  w  ww  . j  a v a 2s.  c om
    handleListUserRequest();
    userService.list(null, "%" + suffix, null, null, "login", true, 100, 0).thenAccept(users -> {
        assertThat(users, not(empty()));
        assertThat(users, hasSize(5));

        assertThat(users.get(0).getLogin(), startsWith("a"));
        assertThat(users.get(1).getLogin(), startsWith("b"));
        assertThat(users.get(2).getLogin(), startsWith("c"));
        assertThat(users.get(3).getLogin(), startsWith("d"));
        assertThat(users.get(4).getLogin(), startsWith("e"));
    }).get(15, TimeUnit.SECONDS);

    userService.list(null, "%" + suffix, null, null, "login", false, 100, 0).thenAccept(users -> {
        assertThat(users, not(empty()));
        assertThat(users, hasSize(5));

        assertThat(users.get(0).getLogin(), startsWith("e"));
        assertThat(users.get(1).getLogin(), startsWith("d"));
        assertThat(users.get(2).getLogin(), startsWith("c"));
        assertThat(users.get(3).getLogin(), startsWith("b"));
        assertThat(users.get(4).getLogin(), startsWith("a"));
    }).get(15, TimeUnit.SECONDS);

    verify(requestHandler, times(2)).handle(argument.capture());
}

---

From source file:com.cloud.network.vpc.NetworkACLServiceImplTest.java

@Test
public void getAllAclRulesSortedByNumberTest() {
    List<NetworkACLItemVO> networkAclItemVos = new ArrayList<>();

    NetworkACLItemVO networkACLItemVO1 = new NetworkACLItemVO();
    networkACLItemVO1.setNumber(1);/*from   w  w  w. j ava2 s  . c  o  m*/

    NetworkACLItemVO networkACLItemVO2 = new NetworkACLItemVO();
    networkACLItemVO2.setNumber(2);

    NetworkACLItemVO networkACLItemVO3 = new NetworkACLItemVO();
    networkACLItemVO3.setNumber(3);

    NetworkACLItemVO networkACLItemVO4 = new NetworkACLItemVO();
    networkACLItemVO4.setNumber(4);

    networkAclItemVos.add(networkACLItemVO1);
    networkAclItemVos.add(networkACLItemVO2);
    networkAclItemVos.add(networkACLItemVO3);
    networkAclItemVos.add(networkACLItemVO4);

    Collections.shuffle(networkAclItemVos);

    Mockito.doReturn(networkAclItemVos).when(networkAclItemDaoMock).listByACL(networkAclMockId);

    List<NetworkACLItemVO> allAclRulesSortedByNumber = networkAclServiceImpl
            .getAllAclRulesSortedByNumber(networkAclMockId);

    Assert.assertEquals(networkAclItemVos.size(), allAclRulesSortedByNumber.size());
    Assert.assertEquals(networkACLItemVO1, networkAclItemVos.get(0));
    Assert.assertEquals(networkACLItemVO2, networkAclItemVos.get(1));
    Assert.assertEquals(networkACLItemVO3, networkAclItemVos.get(2));
    Assert.assertEquals(networkACLItemVO4, networkAclItemVos.get(3));

}

---

From source file:mzb.Balancer.java

/**
 * Balance all namenodes./*from ww w.  j  ava2 s .  com*/
 * For each iteration,
 * for each namenode,
 * execute a {@link Balancer} to work through all datanodes once.  
 */
static int run(Collection<URI> namenodes, Configuration conf) throws IOException, InterruptedException {
    final long sleeptime = 2000 * conf.getLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY,
            DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_DEFAULT);
    LOG.info("namenodes = " + namenodes);
    //    LOG.info("p         = " + p);

    final Formatter formatter = new Formatter(System.out);
    System.out.println(
            "Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being Moved");

    final List<NameNodeConnector> connectors = new ArrayList<NameNodeConnector>(namenodes.size());
    try {
        for (URI uri : namenodes) {
            connectors.add(new NameNodeConnector(uri, conf));
        }

        boolean done = false;
        for (int iteration = 0; !done; iteration++) {
            done = true;
            Collections.shuffle(connectors);
            for (NameNodeConnector nnc : connectors) {
                final Balancer b = new Balancer(nnc, conf);
                final ReturnStatus r = b.run(iteration, formatter, conf);
                // clean all lists
                b.resetData(conf);
                if (r == ReturnStatus.IN_PROGRESS) {
                    done = false;
                } else if (r != ReturnStatus.SUCCESS) {
                    //must be an error statue, return.
                    return r.code;
                }
            }

            if (!done) {
                Thread.sleep(sleeptime);
            }
        }
    } finally {
        for (NameNodeConnector nnc : connectors) {
            nnc.close();
        }
    }
    return ReturnStatus.SUCCESS.code;
}

---

From source file:com.cloud.resource.ResourceManagerImpl.java

@Override
public HypervisorType getAvailableHypervisor(final long zoneId) {
    HypervisorType defaultHype = getDefaultHypervisor(zoneId);
    if (defaultHype == HypervisorType.None) {
        final List<HypervisorType> supportedHypes = getSupportedHypervisorTypes(zoneId, false, null);
        if (supportedHypes.size() > 0) {
            Collections.shuffle(supportedHypes);
            defaultHype = supportedHypes.get(0);
        }/*from  w ww  .j av a  2  s. com*/
    }

    if (defaultHype == HypervisorType.None) {
        defaultHype = HypervisorType.Any;
    }
    return defaultHype;
}

---

From source file:de.uhh.l2g.dao.VideoDao.java

/**
 * Gets the popular videos rnd./*from w ww.j  av a2 s  . c  om*/
 *
 * @param facilityId the facility id
 * @param limit the limit
 * @return the popular videos rnd
 */
@SuppressWarnings("unchecked")
public List<Video> getPopularVideosRnd(Integer facilityId, Integer limit) {

    List<Video> liste = new ArrayList<Video>();
    List<Video> returnList = new ArrayList<Video>();
    String sqlquery = "";
    JdbcTemplate jdbst = new JdbcTemplate(this.getDataSource());
    // ohne Facility
    if (facilityId == 0) {
        sqlquery = "SELECT v.id, v.title, m.creator, l.name, v.filename,  v.generationDate, f.typ, v.lectureseriesId, v.metadataId, v.hostId, v.producerId FROM videohitlist vh, video v, metadata m, lectureseries l, facility f WHERE (v.id = vh.id AND v.metadataId = m.id AND v.lectureseriesId = l.id AND v.facilityId=f.id) GROUP BY v.id";
        liste = jdbst.query(sqlquery, new VideoResultSearchRowMapper());
    }

    //Die Liste Randomisieren
    Collections.shuffle(liste);

    // Die ersten i-Rauspicken (je nachdem wie viele Angezeigt werden sollen), Pruefung auf Listengroesse wichtig falls Liste < Anzeiggroesse
    for (int i = 0; i < limit && i < liste.size(); i++) {
        if (liste.get(i) != null)
            returnList.add(liste.get(i));
    }

    return returnList;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• »