Example usage for java.util List parallelStream

Introduction

In this page you can find the example usage for java.util List parallelStream.

Prototype

default Stream<E> parallelStream() 

Source Link

Document

Returns a possibly parallel Stream with this collection as its source.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    List<Person> persons = Arrays.asList(new Person("Max", 18), new Person("Peter", 23),
            new Person("Pamela", 23), new Person("David", 12));

    Integer ageSum = persons.parallelStream().reduce(0, (sum, p) -> {
        System.out.format("accumulator: sum=%s; person=%s; thread=%s\n", sum, p,
                Thread.currentThread().getName());
        return sum += p.age;
    }, (sum1, sum2) -> {//from ww  w.  j  av  a  2 s.co  m
        System.out.format("combiner: sum1=%s; sum2=%s; thread=%s\n", sum1, sum2,
                Thread.currentThread().getName());
        return sum1 + sum2;
    });

    System.out.println(ageSum);
}

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From source file:com.bobby.peng.learning.java.stream.StreamMap.java

public static void main(String[] args) {
    //        List<Integer> list = StreamMap.newRandomList();
    ///*  www.j  a  v  a 2 s . co m*/
    //        List<Integer> list2 = list.stream().map(i->i*5).collect(Collectors.toList());
    //
    //        StreamMap.printOut(list2);
    //
    //        list = list.subList(0,11);
    //        StreamMap.printOut(list);
    //
    //        String value = "INSERT INTO tech_subao_00.subao_renew_list (id, extra_info, gmt_created, gmt_modified, is_deleted, creator, modifier, remark, status, unqiue_flag, list_biz_id, province_name, province_code, city_name, city_code, license_no, engine_no, frame_no, factory_plate_model, first_register_date, applicant_name, owner_name, owner_certificate_type, owner_id_no, owner_mobile, contact_phone1, contact_phone2, bi_end_date, ci_end_date, vehicle_id, list_allocation_time, booking_start_date, booking_end_date, user_id, renew_batch_id, renew_biz_name, source, organization_id) VALUES (%d, null, '2018-08-07 02:50:36', '2018-08-07 02:50:37', 'N', '', 'system', null, 10, '000000%d', '1', '', '110000', '', '110100', '12312313', '12313', '31231', '111', '2018-05-12', '123', '123', 1, '310111111111111111', '13311111111', '13311111111', '13311111111', '2019-08-07 05:24:56', '2019-08-07 05:25:03', 1, null, null, null, null, %d, 'batch1', 50, 1);";
    //
    //        int id = 3;
    //        for(int i=3;i<100;i++) {
    //            for(int j=0;j<2;j++) {
    //                System.out.println(String.format(value,id,id,i));
    //                id++;
    //            }
    //        }

    List<Integer> test = new ArrayList<>();
    for (int i = 0; i < 1000; i++) {
        test.add(i);
    }

    test.parallelStream().map(i -> {
        System.out.println(i);
        return i;
    }).collect(Collectors.toList());

    System.out.println("===================================");

    test.stream().map(i -> {
        System.out.println(i);
        return i;
    }).collect(Collectors.toList());

}

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From source file:Main.java

public static void main(String[] args) {
    List<Person> roster = createRoster();
    ConcurrentMap<Person.Sex, List<Person>> byGenderParallel = roster.parallelStream()
            .collect(Collectors.groupingByConcurrent(Person::getGender));

    List<Map.Entry<Person.Sex, List<Person>>> byGenderList = new ArrayList<>(byGenderParallel.entrySet());

    System.out.println("Group members by gender:");
    byGenderList.stream().forEach(e -> {
        System.out.println("Gender: " + e.getKey());
        e.getValue().stream().map(Person::getName).forEach(f -> System.out.println(f));
    });//from   ww w.ja v a2 s.co  m

}

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From source file:Main.java

public static void main(String[] args) {
    List<String> strings = new LinkedList<>();
    strings.add("a");
    strings.add("B");
    strings.add("ab");
    strings.add("abc");
    strings.add("ABC");

    ConcurrentMap<Integer, List<String>> byLength = strings.parallelStream()
            .collect(Collectors.groupingByConcurrent(String::length));

    System.out.println(byLength);
}

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From source file:Main.java

public static void main(String[] args) {
    Integer[] intArray = { 1, 2, 3, 4, 5, 6, 7, 8 };
    List<Integer> listOfIntegers = new ArrayList<>(Arrays.asList(intArray));

    List<Integer> serialStorage = new ArrayList<>();

    System.out.println("Serial stream:");
    listOfIntegers.stream()/*from   w  w w  .  j a  v a 2  s. com*/

            // Don't do this! It uses a stateful lambda expression. 
            .map(e -> {
                serialStorage.add(e);
                return e;
            })

            .forEachOrdered(e -> System.out.print(e + " "));
    System.out.println("");

    serialStorage.stream().forEachOrdered(e -> System.out.print(e + " "));
    System.out.println("");

    System.out.println("Parallel stream:");
    List<Integer> parallelStorage = Collections.synchronizedList(new ArrayList<>());
    listOfIntegers.parallelStream()

            // Don't do this! It uses a stateful lambda expression.
            .map(e -> {
                parallelStorage.add(e);
                return e;
            })

            .forEachOrdered(e -> System.out.print(e + " "));
    System.out.println("");

    parallelStorage.stream().forEachOrdered(e -> System.out.print(e + " "));
    System.out.println("");

}

---

From source file:acmi.l2.clientmod.l2_version_switcher.Main.java

public static void main(String[] args) {
    if (args.length != 3 && args.length != 4) {
        System.out.println("USAGE: l2_version_switcher.jar host game version <--splash> <filter>");
        System.out.println("EXAMPLE: l2_version_switcher.jar " + L2.NCWEST_HOST + " " + L2.NCWEST_GAME
                + " 1 \"system\\*\"");
        System.out.println(//from   www .j  a  va  2  s.  co m
                "         l2_version_switcher.jar " + L2.PLAYNC_TEST_HOST + " " + L2.PLAYNC_TEST_GAME + " 48");
        System.exit(0);
    }

    List<String> argsList = new ArrayList<>(Arrays.asList(args));
    String host = argsList.get(0);
    String game = argsList.get(1);
    int version = Integer.parseInt(argsList.get(2));
    Helper helper = new Helper(host, game, version);
    boolean available = false;

    try {
        available = helper.isAvailable();
    } catch (IOException e) {
        System.err.print(e.getClass().getSimpleName());
        if (e.getMessage() != null) {
            System.err.print(": " + e.getMessage());
        }

        System.err.println();
    }

    System.out.println(String.format("Version %d available: %b", version, available));
    if (!available) {
        System.exit(0);
    }

    List<FileInfo> fileInfoList = null;
    try {
        fileInfoList = helper.getFileInfoList();
    } catch (IOException e) {
        System.err.println("Couldn\'t get file info map");
        System.exit(1);
    }

    boolean splash = argsList.remove("--splash");
    if (splash) {
        Optional<FileInfo> splashObj = fileInfoList.stream()
                .filter(fi -> fi.getPath().contains("sp_32b_01.bmp")).findAny();
        if (splashObj.isPresent()) {
            try (InputStream is = new FilterInputStream(
                    Util.getUnzipStream(helper.getDownloadStream(splashObj.get().getPath()))) {
                @Override
                public int read() throws IOException {
                    int b = super.read();
                    if (b >= 0)
                        b ^= 0x36;
                    return b;
                }

                @Override
                public int read(byte[] b, int off, int len) throws IOException {
                    int r = super.read(b, off, len);
                    if (r >= 0) {
                        for (int i = 0; i < r; i++)
                            b[off + i] ^= 0x36;
                    }
                    return r;
                }
            }) {
                new DataInputStream(is).readFully(new byte[28]);
                BufferedImage bi = ImageIO.read(is);

                JFrame frame = new JFrame("Lineage 2 [" + version + "] " + splashObj.get().getPath());
                frame.setContentPane(new JComponent() {
                    {
                        setPreferredSize(new Dimension(bi.getWidth(), bi.getHeight()));
                    }

                    @Override
                    protected void paintComponent(Graphics g) {
                        g.drawImage(bi, 0, 0, null);
                    }
                });
                frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("Splash not found");
        }
        return;
    }

    String filter = argsList.size() > 3 ? separatorsToSystem(argsList.get(3)) : null;

    File l2Folder = new File(System.getProperty("user.dir"));
    List<FileInfo> toUpdate = fileInfoList.parallelStream().filter(fi -> {
        String filePath = separatorsToSystem(fi.getPath());

        if (filter != null && !wildcardMatch(filePath, filter, IOCase.INSENSITIVE))
            return false;
        File file = new File(l2Folder, filePath);

        try {
            if (file.exists() && file.length() == fi.getSize() && Util.hashEquals(file, fi.getHash())) {
                System.out.println(filePath + ": OK");
                return false;
            }
        } catch (IOException e) {
            System.out.println(filePath + ": couldn't check hash: " + e);
            return true;
        }

        System.out.println(filePath + ": need update");
        return true;
    }).collect(Collectors.toList());

    List<String> errors = Collections.synchronizedList(new ArrayList<>());
    ExecutorService executor = Executors.newFixedThreadPool(16);
    CompletableFuture[] tasks = toUpdate.stream().map(fi -> CompletableFuture.runAsync(() -> {
        String filePath = separatorsToSystem(fi.getPath());
        File file = new File(l2Folder, filePath);

        File folder = file.getParentFile();
        if (!folder.exists()) {
            if (!folder.mkdirs()) {
                errors.add(filePath + ": couldn't create parent dir");
                return;
            }
        }

        try (InputStream input = Util
                .getUnzipStream(new BufferedInputStream(helper.getDownloadStream(fi.getPath())));
                OutputStream output = new BufferedOutputStream(new FileOutputStream(file))) {
            byte[] buffer = new byte[Math.min(fi.getSize(), 1 << 24)];
            int pos = 0;
            int r;
            while ((r = input.read(buffer, pos, buffer.length - pos)) >= 0) {
                pos += r;
                if (pos == buffer.length) {
                    output.write(buffer, 0, pos);
                    pos = 0;
                }
            }
            if (pos != 0) {
                output.write(buffer, 0, pos);
            }
            System.out.println(filePath + ": OK");
        } catch (IOException e) {
            String msg = filePath + ": FAIL: " + e.getClass().getSimpleName();
            if (e.getMessage() != null) {
                msg += ": " + e.getMessage();
            }
            errors.add(msg);
        }
    }, executor)).toArray(CompletableFuture[]::new);
    CompletableFuture.allOf(tasks).thenRun(() -> {
        for (String err : errors)
            System.err.println(err);
        executor.shutdown();
    });
}

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From source file:asia.gkc.vneedu.utils.FilterUtil.java

public static Map<String, Object> exclude(List<String> list, Map<String, Object> object) {
    list.parallelStream().forEach((e) -> object.remove(e.trim()));
    return object;
}

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From source file:com.firewallid.util.FIUtils.java

public static <L> Map<L, Long> reduceListToMap(List<L> l) {
    Map<L, Long> map = l.parallelStream()
            .collect(Collectors.groupingBy(object -> object, Collectors.counting()));

    return map;/*from ww w  .jav a  2  s . co m*/
}

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From source file:org.cripac.isee.vpe.ctrl.ConfManager.java

private static void prepareTmpCfgFiles() {
    tmpDir = System.getProperty("java.io.tmpdir");
    List<FileDescriptor> fileList = ConfManager.getCfgFileList(PedestrianTrackingApp.APP_NAME);
    fileList.parallelStream().forEach(file -> {
        File tmp = new File(tmpDir + "/" + file.getConcatName());
        try {// w ww  . j  a  v a2 s  . com
            tmp.createNewFile();
            tmp.deleteOnExit();
            FileOutputStream tmpOutputStream = new FileOutputStream(tmp);
            IOUtils.copy(new FileInputStream(CONF_DIR + "/" + file.getPath()), tmpOutputStream);
            tmpOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    });
}

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From source file:ru.VirtaMarketAnalyzer.main.Wizard.java

public static void saveProductImg(final List<Product> products) {
    products.parallelStream().forEach(product -> {
        saveImg(product.getImgUrl());/*  w  w  w.ja  v a  2 s. c o  m*/
        saveImg(product.getImgUrl().replace("/img/products/", "/img/products/16/"));
    });
}

---

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