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:com.haulmont.cuba.core.sys.remoting.ClusterInvocationSupport.java

public void init() {
    urls = new ArrayList<>();
    String[] strings = baseUrl.split("[,;]");
    for (String string : strings) {
        if (!StringUtils.isBlank(string)) {
            urls.add(string + "/" + servletPath);
        }//from  w ww . j  av a2  s.c o  m
    }
    if (urls.size() > 1 && randomPriority) {
        Collections.shuffle(urls);
    }
}

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From source file:com.gs.collections.impl.jmh.AggregateByTest.java

@Before
@Setup(Level.Iteration)//  w  ww .j a  v a2  s . c  om
public void setUp() {
    this.executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
    Collections.shuffle(this.gscPositions);
    Collections.shuffle(this.jdkPositions);
}

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From source file:com.anhth12.lambda.ml.param.HyperParams.java

public static List<List<?>> chooseHyperParameterCombos(Collection<HyperParamValues<?>> ranges, int howMany,
        int perParam) {
    Preconditions.checkArgument(howMany > 0);
    Preconditions.checkArgument(perParam >= 0);

    int numParams = ranges.size();
    if (numParams == 0 || perParam == 0) {
        return Collections.<List<?>>singletonList(Collections.emptyList());
    }/* w ww .ja v  a  2  s  . com*/

    // Put some reasonable upper limit on the number of combos
    Preconditions.checkArgument(Math.pow(perParam, numParams) <= MAX_COMBOS);

    int howManyCombos = 1;
    List<List<?>> paramRanges = new ArrayList<>(numParams);
    for (HyperParamValues<?> range : ranges) {
        List<?> values = range.getTrialValues(perParam);
        paramRanges.add(values);
        howManyCombos *= values.size();
    }

    List<List<?>> allCombinations = new ArrayList<>(howManyCombos);
    for (int combo = 0; combo < howManyCombos; combo++) {
        List<Object> combination = new ArrayList<>(numParams);
        for (int param = 0; param < numParams; param++) {
            int whichValueToTry = combo;
            for (int i = 0; i < param; i++) {
                whichValueToTry /= paramRanges.get(i).size();
            }
            whichValueToTry %= paramRanges.get(param).size();
            combination.add(paramRanges.get(param).get(whichValueToTry));
        }
        allCombinations.add(combination);
    }

    if (howMany >= howManyCombos) {
        Collections.shuffle(allCombinations);
        return allCombinations;
    }
    RandomDataGenerator rdg = new RandomDataGenerator(RandomManager.getRandom());
    int[] indices = rdg.nextPermutation(howManyCombos, howMany);
    List<List<?>> result = new ArrayList<>(indices.length);
    for (int i = 0; i < indices.length; i++) {
        result.add(allCombinations.get(i));
    }
    Collections.shuffle(result);
    return result;
}

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From source file:aj.com.watchandshare.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    mCardPresenter = new CardPresenter();

    int i;//ww  w . jav  a 2  s . c  o  m
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(mCardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i]);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    HeaderItem gridHeader = new HeaderItem(i, "PREFERENCES");

    GridItemPresenter mGridPresenter = new GridItemPresenter();
    ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);
    gridRowAdapter.add(getResources().getString(R.string.grid_view));
    gridRowAdapter.add(getString(R.string.error_fragment));
    gridRowAdapter.add(getResources().getString(R.string.personal_settings));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

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From source file:androidtvhackathon.mioandroidtv.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    mCardPresenter = new CardPresenter();

    int i;/*from  w ww  .j  a v a2s.  c  o  m*/
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(mCardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i], null);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    HeaderItem gridHeader = new HeaderItem(i, "PREFERENCES", null);

    GridItemPresenter mGridPresenter = new GridItemPresenter();
    ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);
    gridRowAdapter.add(getResources().getString(R.string.grid_view));
    gridRowAdapter.add(getString(R.string.error_fragment));
    gridRowAdapter.add(getResources().getString(R.string.personal_settings));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

---

From source file:com.androidtvhackathon_feb2015.kush2.cahtelevision.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    mCardPresenter = new CardPresenter();

    int i;/*  www.j  av a 2s  . c  o  m*/
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(mCardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i], null);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    HeaderItem gridHeader = new HeaderItem(i, "Players", null);

    GridItemPresenter mGridPresenter = new GridItemPresenter();
    ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);
    //gridRowAdapter.add(getResources().getString(R.string.grid_view));
    //gridRowAdapter.add(getString(R.string.error_fragment));
    gridRowAdapter.add(getResources().getString(R.string.personal_settings));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

---

From source file:com.zz.cluster4spring.support.invocation.ShuffleEndpointSelectionPolicy.java

/**
 * Selects endpoint for invocation from the given list of endpoints. This
 * implementation creates copy of given list, shuffle it and selects
 * firstendpoint from resulting list./* w  w  w.j  a  va 2s.  c  o m*/
 *
 * @param aEndpoints
 *            list of endpoints available for invocation of remote service
 * @return selected endpoints
 * @throws org.springframework.remoting.RemoteAccessException
 *             throw if some error occured during seleting endpoint for
 *             invocation
 * @see Collections#shuffle(java.util.List)
 */
public E selectServiceEndpoint(List<E> aEndpoints) throws RemoteAccessException {
    if (aEndpoints == null) {
        String message = "Unable to obtain service endpoint - list of endpoints is null";
        if (fLog.isErrorEnabled()) {
            fLog.error(message);
        }
        throw new RemoteAccessException(message);
    }

    // we create copy of originated list, shuffle it and select first item
    // from that list
    List<E> copy = new ArrayList<E>(aEndpoints);
    Collections.shuffle(copy);
    E result = copy.get(0);
    if (fLog.isTraceEnabled()) {
        SI serviceInfo = result.getServiceInfo();
        String message = format("EndPoint selected. Service URL: [{0}]", serviceInfo);
        fLog.trace(message);
    }
    return result;
}

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From source file:com.graphaware.neo4j.webexpo.database.DataGenerator.java

/**
 * Find a number of random attendees.//from  w ww .j  a  v a  2s.c  om
 *
 * @param number of attendees to find.
 * @return the given number of random attendees.
 */
public List<String> findRandomAttendees(int number) {
    List<String> allAttendees = findAllAttendees();
    Collections.shuffle(allAttendees);
    return allAttendees.subList(0, number);
}

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From source file:herddb.cluster.PreferLocalBookiePlacementPolicy.java

@Override
public ArrayList<BookieSocketAddress> newEnsemble(int ensembleSize, int quorumSize,
        Set<BookieSocketAddress> excludeBookies) throws BKException.BKNotEnoughBookiesException {

    ArrayList<BookieSocketAddress> newBookies = new ArrayList<>(ensembleSize);
    if (ensembleSize <= 0) {
        return newBookies;
    }//from   w  w  w.  jav  a 2s .  c  o m
    List<BookieSocketAddress> allBookies;
    synchronized (this) {
        allBookies = new ArrayList<>(knownBookies);
    }

    BookieSocketAddress localBookie = null;
    for (BookieSocketAddress bookie : allBookies) {
        if (excludeBookies.contains(bookie)) {
            continue;
        }
        if (isLocalBookie(bookie)) {
            localBookie = bookie;
            break;
        }
    }
    if (localBookie != null) {
        boolean ret = allBookies.remove(localBookie);
        if (!ret) {
            throw new RuntimeException("localBookie not found in list");
        }
        newBookies.add(localBookie);
        --ensembleSize;
        if (ensembleSize == 0) {
            return newBookies;
        }
    }

    Collections.shuffle(allBookies);
    for (BookieSocketAddress bookie : allBookies) {
        if (excludeBookies.contains(bookie)) {
            continue;
        }
        newBookies.add(bookie);
        --ensembleSize;
        if (ensembleSize == 0) {
            return newBookies;
        }
    }

    throw new BKException.BKNotEnoughBookiesException();
}

---

From source file:com.github.lukaszbudnik.gugis.GugisInterceptor.java

@Override
public Object invoke(MethodInvocation i) throws Throwable {
    if (log.isDebugEnabled()) {
        log.debug(/*from  www . j a va  2  s .  c o  m*/
                "Method " + i.getMethod() + " is called on " + i.getThis() + " with args " + i.getArguments());
    }

    Propagate propagate = i.getMethod().getAnnotation(Propagate.class);

    Class clazz = i.getMethod().getDeclaringClass().getInterfaces()[0];

    if (log.isDebugEnabled()) {
        log.debug("About to find bindings for " + clazz);
        log.debug("Propagation set to " + propagate.propagation());
        log.debug("Allow failure set to " + propagate.allowFailure());
    }

    List<Binding<Object>> bindings = injector.findBindingsByType(TypeLiteral.get(clazz));

    if (bindings.size() == 0) {
        log.error("No bindings found for " + clazz);
        throw new GugisException("No bindings found for " + clazz);
    }

    if (log.isDebugEnabled()) {
        log.debug("Found " + bindings.size() + " bindings for " + clazz);
    }

    Observable<Try<Object>> resultsObservable = null;
    switch (propagate.propagation()) {
    //            case FASTEST: {
    //                Observable<Binding<Object>> bindingsObservable = Observable.from(bindings);
    //                Observable<Try<Object>> executedObservable = executeBindings(propagate.allowFailure(), bindingsObservable, i.getMethod().getName(), i.getArguments());
    //                resultsObservable = executedObservable.debounce(5, TimeUnit.MILLISECONDS);
    //                break;
    //            }
    case PRIMARY: {
        resultsObservable = executeRxBindingsForRole(i, bindings, propagate.allowFailure(), Primary.class);
        break;
    }
    case SECONDARY: {
        resultsObservable = executeRxBindingsForRole(i, bindings, propagate.allowFailure(), Secondary.class);
        break;
    }
    case RANDOM: {
        ArrayList<Binding<Object>> modifiableBindings = new ArrayList<Binding<Object>>(bindings);
        Collections.shuffle(modifiableBindings);
        for (Binding<Object> binding : modifiableBindings) {
            Observable<Binding<Object>> bindingsObservable = Observable.just(binding);
            Observable<Try<Object>> executedObservable = executeBindings(propagate.allowFailure(),
                    bindingsObservable, i.getMethod().getName(), i.getArguments());

            Try<Object> tryObject = executedObservable.toBlocking().first();

            if (tryObject.isSuccess()) {
                resultsObservable = Observable.just(tryObject);
                break;
            }
        }
        break;
    }
    default: {
        // handles ALL
        Observable<Binding<Object>> bindingsObservable = Observable.from(bindings);
        resultsObservable = executeBindings(propagate.allowFailure(), bindingsObservable,
                i.getMethod().getName(), i.getArguments());
        break;
    }
    }

    List<Try<Object>> results = resultsObservable.toList().toBlocking().first();

    List<Try<Object>> successes = FluentIterable.from(results).filter(new Predicate<Try<Object>>() {
        @Override
        public boolean apply(Try<Object> input) {
            return input.isSuccess();
        }
    }).toList();

    if (successes.size() == 0) {
        String errorMessage = ErrorMessageBuilder
                .buildErrorMessageFromTries("No result for " + propagate.propagation() + " found for "
                        + clazz.getCanonicalName() + "." + i.getMethod().getName(), results);
        throw new GugisException(errorMessage);
    }

    // all implementations should be homogeneous and should return same value for same arguments
    Try<Object> tryObject = successes.get(0);

    if (log.isDebugEnabled()) {
        log.debug("Method " + i.getMethod() + " returns " + tryObject.get());
    }

    return tryObject.get();
}

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