Example usage for java.util.concurrent Semaphore Semaphore

Introduction

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

Prototype

public Semaphore(int permits) 

Source Link

Document

Creates a Semaphore with the given number of permits and nonfair fairness setting.

Usage

From source file:org.apache.flume.client.avro.TestReliableSpoolingFileEventReader.java

@Test
public void testConsumeFileRandomlyNewFile() throws Exception {
    // Atomic moves are not supported in Windows.
    if (SystemUtils.IS_OS_WINDOWS) {
        return;/*ww w.j a  va2 s.  co m*/
    }
    final ReliableEventReader reader = new ReliableSpoolingFileEventReader.Builder().spoolDirectory(WORK_DIR)
            .consumeOrder(ConsumeOrder.RANDOM).build();
    File fileName = new File(WORK_DIR, "new-file");
    FileUtils.write(fileName, "New file created in the end. Shoud be read randomly.\n");
    Set<String> expected = Sets.newHashSet();
    int totalFiles = WORK_DIR.listFiles().length;
    final Set<String> actual = Sets.newHashSet();
    ExecutorService executor = Executors.newSingleThreadExecutor();
    final Semaphore semaphore1 = new Semaphore(0);
    final Semaphore semaphore2 = new Semaphore(0);
    Future<Void> wait = executor.submit(new Callable<Void>() {
        @Override
        public Void call() throws Exception {
            readEventsForFilesInDir(WORK_DIR, reader, actual, semaphore1, semaphore2);
            return null;
        }
    });
    semaphore1.acquire();
    File finalFile = new File(WORK_DIR, "t-file");
    FileUtils.write(finalFile, "Last file");
    semaphore2.release();
    wait.get();
    int listFilesCount = ((ReliableSpoolingFileEventReader) reader).getListFilesCount();
    finalFile.delete();
    createExpectedFromFilesInSetup(expected);
    expected.add("");
    expected.add("New file created in the end. Shoud be read randomly.");
    expected.add("Last file");
    Assert.assertTrue(listFilesCount < (totalFiles + 2));
    Assert.assertEquals(expected, actual);
}

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From source file:com.pinterest.pinlater.client.PinLaterQueryIssuer.java

private void issueDequeueAckRequests(final PinLater.ServiceIface iface) throws InterruptedException {
    Preconditions.checkNotNull(queueName, "Queue was not specified.");
    final AtomicLong queriesIssued = new AtomicLong(0);
    final Semaphore permits = new Semaphore(concurrency);
    while (numQueries == -1 || queriesIssued.get() < numQueries) {
        final PinLaterDequeueRequest request = new PinLaterDequeueRequest();
        request.setQueueName(queueName);
        request.setLimit(batchSize);//from   w w  w  .j  a va2s .c  o  m
        final long startTimeNanos = System.nanoTime();
        queriesIssued.incrementAndGet();
        permits.acquire();
        iface.dequeueJobs(REQUEST_CONTEXT, request)
                .flatMap(new Function<PinLaterDequeueResponse, Future<Void>>() {
                    @Override
                    public Future<Void> apply(PinLaterDequeueResponse response) {
                        if (response.getJobsSize() == 0) {
                            return Future.Void();
                        }

                        PinLaterJobAckRequest jobAckRequest = new PinLaterJobAckRequest(queueName);
                        for (String job : response.getJobs().keySet()) {
                            if (random.nextInt(100) < dequeueSuccessPercent) {
                                jobAckRequest.addToJobsSucceeded(new PinLaterJobAckInfo(job));
                            } else {
                                jobAckRequest.addToJobsFailed(new PinLaterJobAckInfo(job));
                            }
                        }
                        return iface.ackDequeuedJobs(REQUEST_CONTEXT, jobAckRequest);
                    }
                }).respond(new Function<Try<Void>, BoxedUnit>() {
                    @Override
                    public BoxedUnit apply(Try<Void> voidTry) {
                        permits.release();
                        statsLogger
                                .requestComplete(Duration.fromNanoseconds(System.nanoTime() - startTimeNanos));
                        if (voidTry.isThrow()) {
                            LOG.info("Exception for request: " + request + " : " + ((Throw) voidTry).e());
                        }
                        return BoxedUnit.UNIT;
                    }
                });
    }
    permits.acquire(concurrency);
    LOG.info("Dequeue/ack queries issued: " + queriesIssued);
}

---

From source file:com.digium.respokesdk.RespokeCall.java

/**
 *  Common constructor logic//ww  w .  j  a  v  a  2s.  com
 *
 *  @param channel  The signaling channel to use for the call
 */
private void commonConstructor(RespokeSignalingChannel channel) {
    signalingChannel = channel;
    iceServers = new ArrayList<PeerConnection.IceServer>();
    queuedLocalCandidates = new ArrayList<IceCandidate>();
    queuedRemoteCandidates = new ArrayList<IceCandidate>();
    collectedLocalCandidates = new ArrayList<IceCandidate>();
    sessionID = Respoke.makeGUID();
    timestamp = new Date();
    queuedRemoteCandidatesSemaphore = new Semaphore(1); // remote candidates queue mutex
    localCandidatesSemaphore = new Semaphore(1); // local candidates queue mutex

    if (null != signalingChannel) {
        RespokeSignalingChannel.Listener signalingChannelListener = signalingChannel.GetListener();
        if (null != signalingChannelListener) {
            signalingChannelListener.callCreated(this);
        }
    }

    //TODO resign active handler?
}

---

From source file:com.cwp.android.baidutest.MyApplication.java

public static void startMaInfoMonitoring() {

    //?MaInfo?//w ww.j a va  2  s .  c  o  m
    BmobRealTimeData rtd = new BmobRealTimeData();

    //start?
    //??
    rtd.start(mContext, new ValueEventListener() {
        @Override
        public void onConnectCompleted() {
            //?
            Log.d("->MyApplication", "BmobRealTimeData->currentThread=" + Thread.currentThread());
            Log.d("->MyApplication", "BmobRealTimeData->?:" + rtd.isConnected());

            //?
            if (rtd.isConnected()) {
                rtd.subTableUpdate("MaInfo");
            }
        }

        @Override
        public void onDataChange(JSONObject jsonObject) {
            //

            new Thread(() -> {
                Log.d("->MyApplication", "onDataChange->currentThread=" + Thread.currentThread());
                Log.d("->MyApplication",
                        "onDataChange->(" + jsonObject.optString("action") + ")\n?" + jsonObject);

                if (BmobRealTimeData.ACTION_UPDATETABLE.equals(jsonObject.optString("action"))) {
                    JSONObject data = jsonObject.optJSONObject("data");

                    Log.d("->MyApplication", "onDataChange->?");
                    String username = data.optString("username");
                    String vin = data.optString("vin");

                    try {
                        mSyncSemaphore.acquire();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    //?????????????
                    List<AutoInfo> list = AutoInfoLocalDBOperation
                            .queryBy(mContext,
                                    AutoInfoConstants.COLUMN_USERNAME + " = ? and "
                                            + AutoInfoConstants.COLUMN_VIN + " = ?",
                                    new String[] { username, vin });
                    if (list.size() != 0) {
                        Log.d("->MyApplication", "onDataChange->?");
                        //?
                        AutoInfo autoInfo = list.get(0);
                        String brand = autoInfo.getBrand();
                        String model = autoInfo.getModel();
                        String plateNum = autoInfo.getLicensePlateNum();
                        Message message = Message.obtain();
                        message.what = -1;
                        message.obj = brand + " " + model + " " + plateNum;
                        //???????
                        if (data.optInt("gasolineVolume") < 20) {//?<20%
                            //
                            mHandler.sendEmptyMessage(1);
                        }

                        //?15000?
                        //?1500?(??)?????

                        //???

                        //??5.E.a-c,????
                        //????
                        Semaphore semaphore = new Semaphore(1);
                        double mileage = data.optDouble("mileage");
                        //mileage?15000??
                        if (mileage >= 15000) {
                            try {
                                semaphore.acquire();
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                            String scanTime = data.optString("scanTime");
                            BmobQuery<MaInfo> query = new BmobQuery<MaInfo>();
                            query.addWhereEqualTo("username", username);
                            query.addWhereEqualTo("vin", vin);
                            query.addWhereLessThan("scanTime", scanTime);
                            query.addQueryKeys("scanTime");
                            query.order("-scanTime");
                            final Semaphore finalSemaphore = semaphore;
                            query.findObjects(mContext, new FindListener<MaInfo>() {
                                @Override
                                public void onSuccess(List<MaInfo> list) {
                                    int current = (int) mileage / 15000;
                                    Log.d("", "current=" + current + ",mileage=" + mileage);
                                    if (list.size() == 0) {
                                        message.obj = current;
                                        message.what = 2;
                                        mHandler.sendMessage(message);
                                    } else {
                                        double lastMileage = list.get(0).getMileage();
                                        int last = (int) lastMileage / 15000;
                                        if (current > last) {
                                            Message message = Message.obtain();
                                            message.obj = current;
                                            message.what = 2;
                                            mHandler.sendMessage(message);
                                        }
                                    }
                                    finalSemaphore.release();
                                }

                                @Override
                                public void onError(int i, String s) {
                                    finalSemaphore.release();
                                }
                            });
                        }

                        try {
                            semaphore.acquire();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        //???????????
                        if (data.optString("enginePerfor").equals("")) {//?
                            mHandler.sendEmptyMessage(3);
                        }
                        if (data.optString("lamp").equals("")) {//?
                            mHandler.sendEmptyMessage(4);
                        }
                        if (data.optString("transmissionPerfor").equals("")) {//?
                            mHandler.sendEmptyMessage(5);
                        }
                        semaphore.release();

                        //????
                        mHandler.sendEmptyMessage(0);
                        mSyncSemaphore.release();
                        Log.d("++++++++++++++++++++", "++++++++++++++++");
                    } else {
                        mSyncSemaphore.release();
                    }
                }
            }).start();
        }
    });
}

---

From source file:com.impetus.ankush2.cassandra.deployer.CassandraDeployer.java

/**
 * Perform asynchronous operations nodes.
 * /*from w  w  w  .j  a v a 2  s . c om*/
 * @param nodeList
 *            {@link Collection}
 * @return <code>true</code>, if successful
 */
private boolean validate(Collection<String> nodeList) throws AnkushException {
    try {
        // Create semaphore to join threads
        final Semaphore semaphore = new Semaphore(nodeList.size());
        for (final String host : nodeList) {
            final NodeConfig nodeConfig = clusterConfig.getNodes().get(host);
            semaphore.acquire();
            AppStoreWrapper.getExecutor().execute(new Runnable() {
                @Override
                public void run() {
                    nodeConfig.setStatus(new CassandraValidator(clusterConfig, nodeConfig).validate());

                    if (semaphore != null) {
                        semaphore.release();
                    }
                }

            });
        }
        semaphore.acquire(nodeList.size());
    } catch (Exception e) {
        throw new AnkushException(getComponentName() + " validation failed.");
    }
    return AnkushUtils.getStatus(clusterConfig, nodeList);
}

---

From source file:com.pinterest.rocksplicator.controller.DispatcherTest.java

@Test
public void testRetryTask() throws Exception {
    final String errorMsg = "Boom!!!";
    TaskBase task = new ThrowingTask(errorMsg).retry(3).getEntity();
    final CountDownLatch latch = new CountDownLatch(3);
    FIFOTaskQueue tq = new FIFOTaskQueue(10) {
        @Override//  w  w w . j av  a  2s.  com
        public boolean finishTask(final long id, final String output) {
            latch.countDown();
            return super.finishTask(id, output);
        }

        @Override
        public long finishTaskAndEnqueueRunningTask(final long id, final String output, final TaskBase newTask,
                final String worker) {
            latch.countDown();
            return super.finishTaskAndEnqueueRunningTask(id, output, newTask, worker);
        }
    };
    tq.enqueueTask(task, Integer.toString(++nameCounter), 0);

    Semaphore idleWorkersSemaphore = new Semaphore(2);
    ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 2, 0, TimeUnit.SECONDS,
            new ArrayBlockingQueue<Runnable>(2));
    WorkerPool workerPool = new WorkerPool(threadPoolExecutor, idleWorkersSemaphore, tq);
    TaskDispatcher dispatcher = new TaskDispatcher(2, idleWorkersSemaphore, workerPool, tq);
    dispatcher.start();

    Assert.assertTrue(latch.await(30, TimeUnit.SECONDS));
    Assert.assertEquals(tq.getResult(0), errorMsg);
    Assert.assertEquals(tq.getResult(1), errorMsg);
    Assert.assertEquals(tq.getResult(2), errorMsg);
    dispatcher.stop();
}

---

From source file:com.arpnetworking.metrics.impl.ApacheHttpSinkTest.java

@Test
public void testCompoundUnits() throws InterruptedException {
    _wireMockRule.stubFor(WireMock.requestMatching(new RequestValueMatcher(r -> {
        // Annotations
        Assert.assertEquals(0, r.getAnnotationsCount());

        // Dimensions
        Assert.assertEquals(0, r.getDimensionsCount());

        // Samples
        Assert.assertEquals(0, r.getTimersCount());
        Assert.assertEquals(0, r.getTimersCount());
        assertSample(r.getGaugesList(), "gauge", 10d, ClientV2.Unit.Type.Value.BIT,
                ClientV2.Unit.Scale.Value.UNIT, ClientV2.Unit.Type.Value.SECOND,
                ClientV2.Unit.Scale.Value.UNIT);
    })).willReturn(WireMock.aResponse().withStatus(200)));

    final Semaphore semaphore = new Semaphore(0);
    final Sink sink = new ApacheHttpSink.Builder()
            .setUri(URI.create("http://localhost:" + _wireMockRule.port() + PATH))
            .setEventHandler(new CompletionHandler(semaphore)).build();

    final TsdEvent event = new TsdEvent(Collections.emptyMap(), createQuantityMap(), createQuantityMap(),
            createQuantityMap("gauge", TsdQuantity.newInstance(10d, Units.BITS_PER_SECOND)));

    sink.record(event);//from  w w w  .  ja va  2 s  .c  om
    semaphore.acquire();

    // Request matcher
    final RequestPatternBuilder requestPattern = WireMock.postRequestedFor(WireMock.urlEqualTo(PATH))
            .withHeader("Content-Type", WireMock.equalTo("application/octet-stream"));

    // Assert that data was sent
    _wireMockRule.verify(1, requestPattern);
    Assert.assertTrue(_wireMockRule.findUnmatchedRequests().getRequests().isEmpty());
}

---

From source file:org.bart452.runningshoesensor.MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    requestPermission();//from  w  w  w  .j  a v  a  2s .  co m
    context = getApplicationContext();

    mHeaderImageView = (ImageView) findViewById(R.id.appBarIv);
    Picasso.with(context).load(R.drawable.sunset_road_landscape).into(mHeaderImageView);

    // Toolbar
    mToolbar = (Toolbar) findViewById(R.id.toolBar);
    setSupportActionBar(mToolbar);
    mCollapsingTb = (CollapsingToolbarLayout) findViewById(R.id.collapsingToolbar);
    mCollapsingTb.setTitle("Shoe sensor");
    mCollapsingTb.setExpandedTitleGravity(Gravity.CENTER_HORIZONTAL | Gravity.TOP);

    // Bluetooth
    final BluetoothManager mBleMan = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    mBleAdapter = mBleMan.getAdapter();
    mBleScanner = mBleAdapter.getBluetoothLeScanner();
    mCharList = new ArrayList<>();
    mBleSem = new Semaphore(1);
    mBleThread = new BleThread(mBleSem);
    mBleThread.start();

    mBleReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
                if (mBleAdapter.getState() == BluetoothAdapter.STATE_ON) {
                    Log.d(LOG_TAG, "BT ON");
                    mScanFab.setEnabled(true);
                    if (mSnackBar != null) {
                        if (mSnackBar.isShown())
                            mSnackBar.dismiss();
                    }
                } else {
                    mScanFab.setEnabled(false);
                    bleEnable();
                }
            }
        }
    };

    // Text
    mDevNameTv = (TextView) findViewById(R.id.devNameTv);
    mDevNameTv.setText(getString(R.string.device_name) + " No device found");
    mRssiTv = (TextView) findViewById(R.id.rssiTv);
    mAddrTv = (TextView) findViewById(R.id.devAddrTv);

    // Buttons and switches
    mScanFab = (FloatingActionButton) findViewById(R.id.scanFab);
    mScanFab.setOnClickListener(this);
    mConnSwitch = (Switch) findViewById(R.id.connSwitch);
    mConnSwitch.setOnClickListener(this);

    //Graph
    mDataGraph = (GraphView) findViewById(R.id.dataGraph);
    mDataXSeries = new LineGraphSeries<>();
    mDataYSeries = new LineGraphSeries<>();
    mDataYSeries.setBackgroundColor(Color.RED);
    mDataGraph.addSeries(mDataXSeries);
    mDataGraph.addSeries(mDataYSeries);
    mDataGraph.getViewport().setXAxisBoundsManual(true);
    mDataGraph.getViewport().setMinX(0);
    mDataGraph.getViewport().setMaxX(20);

    // Animation
    mRotateAnim = new RotateAnimation(0, 720, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
            0.5f);
    mRotateAnim.setDuration(SCAN_PERIOD);
    mRotateAnim.setInterpolator(new LinearInterpolator());
    bleEnable();
}

---

From source file:com.all.app.ApplicationUtils.java

public static void showFrameAndWaitForClose(Window window) {
    try {/*from w ww  .  j a  v  a 2 s. c  o  m*/
        final Semaphore lock = new Semaphore(0);
        window.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                lock.release();
            }
        });
        window.setVisible(true);
        lock.acquire();
    } catch (Exception e) {
        LOG.error(e, e);
    }
}

---

From source file:com.netflix.curator.framework.imps.TestFrameworkEdges.java

@Test
public void testRetry() throws Exception {
    final int MAX_RETRIES = 3;
    final int serverPort = server.getPort();

    final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), 1000, 1000,
            new RetryOneTime(10));
    client.start();//w  ww  .  jav  a  2  s  .c  om
    try {
        final AtomicInteger retries = new AtomicInteger(0);
        final Semaphore semaphore = new Semaphore(0);
        client.getZookeeperClient().setRetryPolicy(new RetryPolicy() {
            @Override
            public boolean allowRetry(int retryCount, long elapsedTimeMs, RetrySleeper sleeper) {
                semaphore.release();
                if (retries.incrementAndGet() == MAX_RETRIES) {
                    try {
                        server = new TestingServer(serverPort);
                    } catch (Exception e) {
                        throw new Error(e);
                    }
                }
                return true;
            }
        });

        server.stop();

        // test foreground retry
        client.checkExists().forPath("/hey");
        Assert.assertTrue(semaphore.tryAcquire(MAX_RETRIES, 10, TimeUnit.SECONDS));

        semaphore.drainPermits();
        retries.set(0);

        server.stop();

        // test background retry
        client.checkExists().inBackground().forPath("/hey");
        Assert.assertTrue(semaphore.tryAcquire(MAX_RETRIES, 10, TimeUnit.SECONDS));
    } catch (Throwable e) {
        Assert.fail("Error", e);
    } finally {
        IOUtils.closeQuietly(client);
    }
}

---

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