Example usage for java.util.concurrent Executors newFixedThreadPool

Introduction

In this page you can find the example usage for java.util.concurrent Executors newFixedThreadPool.

Prototype

public static ExecutorService newFixedThreadPool(int nThreads) 

Source Link

Document

Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue.

Usage

From source file:FullReindexer.java

public void reindex() throws IOException {
    ExecutorService executor = Executors.newFixedThreadPool(totalThreads);

    for (int i = 0; i < totalThreads; i++) {
        Worker worker = new Worker(i, totalThreads, readClient, writeClient);
        executor.execute(worker);//from  www  . j  av a2s .  com
    }

    executor.shutdown();

    while (!executor.isTerminated()) {
        // Wait until done
    }

    readClient.close();
    writeClient.close();
}

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From source file:DFSBenchmark.java

public DFSBenchmark(int threads, Path basePath) {
    this.threads = threads;
    this.baseDirPath = basePath;
    greenSignal = new CountDownLatch(threads);
    service = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(threads));
    reporter.enable(metrics, 3000, TimeUnit.MILLISECONDS);
}

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From source file:com.cloudera.oryx.ml.serving.als.LoadIT.java

@Test
public void testRecommendLoad() throws Exception {
    // Since latency is more important, and local machine will also be busy handling requests,
    // use few concurrent workers, like 1:
    int workers = 1;
    AtomicLong count = new AtomicLong();
    Mean meanReqTimeMS = new Mean();
    long start = System.currentTimeMillis();

    List<Callable<Void>> tasks = new ArrayList<>(workers);
    for (int i = 0; i < workers; i++) {
        tasks.add(new LoadCallable(Integer.toString(i), meanReqTimeMS, count, start));
    }//w ww .ja  v  a 2 s  .  c  o  m

    ExecutorService executor = Executors.newFixedThreadPool(workers);
    try {
        executor.invokeAll(tasks);
    } finally {
        executor.shutdown();
    }

    int totalRequests = workers * REQS_PER_WORKER;
    log(totalRequests, meanReqTimeMS, start);

    Assert.assertTrue(meanReqTimeMS.getResult() < 300.0);
}

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From source file:cc.kave.commons.pointsto.evaluation.DefaultModule.java

@Override
protected void configure() {
    configCrossValidation();/*from  ww w .  jav  a  2s. com*/
    configOptions();

    configMeasure();

    bind(new TypeLiteral<Predicate<Usage>>() {
    }).annotatedWith(UsageFilter.class).to(PointsToUsageFilter.class);
    bind(ResultExporter.class).to(CSVExporter.class);

    // Executor for CVEvaluator
    int numThreads;
    if (System.getProperties().containsKey("evaluation.numthreads")) {
        numThreads = Integer.parseInt(System.getProperty("evaluation.numthreads"));
    } else {
        numThreads = Math.min(6, Runtime.getRuntime().availableProcessors());
    }
    ExecutorService executorService = Executors.newFixedThreadPool(numThreads);
    // ExecutorService executorService = Executors.newSingleThreadExecutor();
    bind(ExecutorService.class).toInstance(executorService);
}

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From source file:com.jillesvangurp.httpclientfuture.HttpClientWithFutureTest.java

@BeforeClass
public void beforeClass() {
    webServerExecutor = Executors.newSingleThreadExecutor();
    webServer = new WebServer();
    webServerExecutor.execute(webServer);
    clientThreadPool = Executors.newFixedThreadPool(threads);
    PoolingClientConnectionManager conman = new PoolingClientConnectionManager();
    conman.setDefaultMaxPerRoute(threads);
    conman.setMaxTotal(threads);//from   ww  w .  j  av  a  2s. com
    DefaultHttpClient httpclient = new DefaultHttpClient(conman);
    client = new HttpClientWithFuture<Boolean>(httpclient, clientThreadPool, new ResponseHandler<Boolean>() {
        @Override
        public Boolean handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
            return response.getStatusLine().getStatusCode() == 200;
        }
    });
}

---

From source file:gr.demokritos.iit.cru.creativity.reasoning.semantic.WebMiner.java

public static String WebMiner(String seed, int difficulty, String language, boolean compactForm)
        throws ClassNotFoundException, SQLException, IOException, InstantiationException,
        IllegalAccessException {/*w  w  w . jav  a  2 s.co  m*/
    Gson gson = new Gson();
    Connect c = new Connect(language);
    RandomWordGenerator r = new RandomWordGenerator(c);
    String randomPhrase = r.selectRandomWord(seed, difficulty).replace(",", " ");
    InfoSummarization inf = new InfoSummarization(c);
    LinkedHashMap<String, Double> TagCloud = new LinkedHashMap<String, Double>();

    Set<String> pages = new HashSet<String>();
    ArrayList<String> urls = new ArrayList<String>();
    ArrayList<String> urls_temp = new ArrayList<String>();
    if (language.equalsIgnoreCase("en")) {
        if (randomPhrase.length() == 0) {
            randomPhrase = seed;
        }
        String bingAppId = c.getBingAppId();
        BingCrawler bc = new BingCrawler(bingAppId, language);
        urls_temp = bc.crawl(randomPhrase);
        int url_loop = 0;
        while ((url_loop < 5) && (url_loop < urls_temp.size())) {
            urls.add(urls_temp.get(url_loop));
            url_loop++;
        }
    } else if (language.equalsIgnoreCase("el")) {
        String bingAppId = c.getBingAppId();
        BingCrawler bc = new BingCrawler(bingAppId, language);
        urls_temp = bc.crawl(randomPhrase);
        int url_loop = 0;
        while ((url_loop < 5) && (url_loop < urls_temp.size())) {
            urls.add(urls_temp.get(url_loop));
            url_loop++;
        }
    } else if (language.equalsIgnoreCase("de")) {//keep only the first word of the random phrase for search
        if (randomPhrase.length() == 0) {
            randomPhrase = seed;
        }
        urls_temp = HTMLUtilities.linkExtractor(
                "http://www.fragfinn.de/kinderliste/suche?start=0&query=" + randomPhrase.split(" ")[0], "UTF-8",
                0);

        for (String url : urls_temp) {
            urls.add(StringEscapeUtils.unescapeHtml4(url));
            if (urls.size() == 5) {
                break;
            }
        }
    }
    String delims = "[{} .,;?!():\"]+";

    String[] words = randomPhrase.split(",");
    String[] user_keywords = seed.split(delims);
    if (urls.size() > 0) {
        ExecutorService threadPool = Executors.newFixedThreadPool(urls.size());
        for (String url : urls) {
            threadPool.submit(new HTMLPages(url, pages, language)); //stopWordSet, tokensHashMap,language));
            // threadPool.submit(HTMLTokenizer());
        }
        threadPool.shutdown();
        while (!threadPool.isTerminated()) {

        }

        LinkedHashMap<ArrayList<String>, Double> temp = inf.TopTermsBing(pages, compactForm);
        HashMap<String, Double> temp2 = new HashMap<String, Double>();
        for (ArrayList<String> stems : temp.keySet()) {
            for (int j = 0; j < stems.size(); j++) {
                String s = stems.get(j).split("\\{")[0];
                s = s.replace(",", " ");
                s = s.trim();

                boolean wordnet = true;
                //if term is not one of the initial random phrase
                for (int i = 0; i < words.length; i++) {
                    if (s.equalsIgnoreCase(words[i])) {
                        wordnet = false;
                    }
                }
                //and if it 's not in the initial words of user
                for (int i = 0; i < user_keywords.length; i++) {
                    if (s.equalsIgnoreCase(user_keywords[i])) {
                        wordnet = false;
                    }
                }
                //in german or greek, ignore english words from search english words
                if (language.equalsIgnoreCase("de") || language.equalsIgnoreCase("el")) {
                    if (c.getWn().getCommonPos(s) != null) {
                        continue;
                    }
                }
                //return it with its stem's weight
                if (wordnet) {
                    //for every stem, put each of its corresponding terms to tagCloud with the stem's tf
                    temp2.put(stems.get(j), temp.get(stems));
                }
            }
        }
        TagCloud = inf.sortHashMapByValues(temp2);
        threadPool.shutdownNow();
    }
    String json = gson.toJson(TagCloud);
    c.CloseConnection();
    return json;
}

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From source file:com.otway.picasasync.syncutil.SyncManager.java

public SyncManager(Settings settings) {
    this.settings = settings;

    log.info("Initialising Thread Pool");
    executor = Executors.newFixedThreadPool(1);

    log.info("Initialising SyncState");
    syncState = new SyncState();

    log.info("Initialising OAuth");
    auth = new GoogleOAuth();

    log.info("SyncManager initialised successfully.");
}

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From source file:info.pancancer.arch3.coordinator.Coordinator.java

public void doWork() throws InterruptedException, ExecutionException {
    ExecutorService pool = Executors.newFixedThreadPool(DEFAULT_THREADS);
    CoordinatorOrders coordinatorOrders = new CoordinatorOrders(this.configFile,
            this.options.has(this.endlessSpec));
    CleanupJobs cleanupJobs = new CleanupJobs(this.configFile, this.options.has(this.endlessSpec));
    FlagJobs flagJobs = new FlagJobs(this.configFile, this.options.has(this.endlessSpec));
    List<Future<?>> futures = new ArrayList<>();
    futures.add(pool.submit(coordinatorOrders));
    futures.add(pool.submit(cleanupJobs));
    futures.add(pool.submit(flagJobs));/*  w w  w  .j av a2 s.  c o  m*/
    try {
        for (Future<?> future : futures) {
            future.get();
        }
    } catch (InterruptedException | ExecutionException ex) {
        log.error(ex.toString());
        throw new RuntimeException(ex);
    } finally {
        pool.shutdown();
    }
}

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From source file:com.solace.demos.cloudfoundry.scaling.aggregator.controller.SolaceController.java

@PostConstruct
public void init() {
    // Connect to Solace
    trace.info("************* Init Called ************");

    try {/*www .j a va2s.  c o  m*/
        session = jcsmpFactory.createSession();
        session.connect();

        destForPublish = JCSMPFactory.onlyInstance().createQueue("Q/demo/requests");

        isSolaceConnected = true;
        System.out.println("************* Solace initialized correctly!! ************");

    } catch (Exception e) {
        trace.error("Error connecting and setting up session.", e);
    }

    executor = Executors.newFixedThreadPool(NUM_PUBLISH_THREADS);

}

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From source file:it.infn.ct.futuregateway.apiserver.inframanager.MonitorQueue.java

/**
 * Build a monitor queue./* ww w .  ja  va 2  s .  c  o  m*/
 * A monitor queue is made of two elements: queue and monitor thread. Both
 * are created.
 *
 * @param bufferSize  A queue to store the activities
 * @param threadPoolSize A thread pool for the monitoring
 * @param checkInterval The minimum interval between checks in milliseconds
 */
public MonitorQueue(final int bufferSize, final int threadPoolSize, final int checkInterval) {
    log.debug("Creating the monitor queue");
    monitorQueue = new ArrayBlockingQueue<>(bufferSize);
    log.debug("Creating the monitor thread pool");
    monitorPool = Executors.newFixedThreadPool(threadPoolSize);
    for (int i = 0; i < threadPoolSize; i++) {
        monitorPool.submit(new Monitor(monitorQueue, checkInterval));
    }
}

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