Example usage for java.lang Thread yield

Introduction

In this page you can find the example usage for java.lang Thread yield.

Prototype

public static native void yield();

Source Link

Document

A hint to the scheduler that the current thread is willing to yield its current use of a processor.

Usage

From source file:org.apache.hadoop.hbase.rest.TestRowResource.java

private static Response checkAndDeleteXML(String url, String table, String row, String column,
        String valueToCheck) throws IOException, JAXBException {
    RowModel rowModel = new RowModel(row);
    rowModel.addCell(new CellModel(Bytes.toBytes(column), Bytes.toBytes(valueToCheck)));
    CellSetModel cellSetModel = new CellSetModel();
    cellSetModel.addRow(rowModel);/* ww  w . j a  va  2 s .  c o  m*/
    StringWriter writer = new StringWriter();
    marshaller.marshal(cellSetModel, writer);
    Response response = client.put(url, Constants.MIMETYPE_XML, Bytes.toBytes(writer.toString()));
    Thread.yield();
    return response;
}

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From source file:com.taobao.metamorphosis.gregor.slave.OrderedThreadPoolExecutor.java

/**
 * {@inheritDoc}//from   w  w w  . ja va2s  .  com
 */
@Override
public List<Runnable> shutdownNow() {
    this.shutdown();

    final List<Runnable> answer = new ArrayList<Runnable>();
    IoCatalog ioCatalog;

    while ((ioCatalog = this.waitingIoCatalogs.poll()) != null) {
        if (ioCatalog == EXIT_SIGNAL) {
            this.waitingIoCatalogs.offer(EXIT_SIGNAL);
            Thread.yield(); // Let others take the signal.
            continue;
        }
        final TasksQueue sessionTasksQueue = (TasksQueue) ioCatalog.connection
                .getAttribute(this.getCatalog(ioCatalog));
        synchronized (sessionTasksQueue.tasksQueue) {
            for (final Runnable task : sessionTasksQueue.tasksQueue) {
                answer.add(task);
            }
            sessionTasksQueue.tasksQueue.clear();
        }
    }

    return answer;
}

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From source file:com.codefollower.lealone.omid.tso.ClientHandler.java

/**
 * Start a new transaction//  w w  w .  ja  v a  2  s  .  c o  m
 * 
 * @param channel
 * @throws IOException 
 */
private void startTransaction() {
    while (true) {// fill the pipe with as much as request you can
        if (!((channel.getInterestOps() & Channel.OP_WRITE) == 0))
            return;

        // if (outstandingTransactions.intValue() >= MAX_IN_FLIGHT)
        if (outstandingTransactions >= MAX_IN_FLIGHT)
            return;

        if (curMessage == 0) {
            LOG.info("No more messages, stopping benchmark");
            // wait for all outstanding msgs and then close the channel
            // if (outstandingTransactions.intValue() == 0) {
            if (outstandingTransactions == 0) {
                LOG.info("Close channel");
                channel.close().addListener(new ChannelFutureListener() {
                    public void operationComplete(ChannelFuture future) {
                        answer.offer(true);
                    }
                });
            }
            return;
        }
        curMessage--;
        //         TimestampRequest tr = new TimestampRequest();
        outstandingTransactions++;
        // outstandingTransactions.incrementAndGet();
        //         Channels.write(channel, tr);
        try {
            super.getNewTimestamp(new SyncCreateCallback());
        } catch (IOException e) {
            LOG.error("Couldn't start transaction", e);
        }

        Thread.yield();
    }
}

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From source file:org.apache.hadoop.hbase.regionserver.TestSplitLogWorker.java

@Test(timeout = 60000)
public void testRescan() throws Exception {
    LOG.info("testRescan");
    SplitLogCounters.resetCounters();/*from  www. j a v  a  2  s .c  om*/
    final ServerName SRV = ServerName.valueOf("svr,1,1");
    RegionServerServices mockedRS = getRegionServer(SRV);
    slw = new SplitLogWorker(zkw, TEST_UTIL.getConfiguration(), mockedRS, neverEndingTask);
    slw.start();
    Thread.yield(); // let the worker start
    Thread.sleep(100);

    String task = ZKSplitLog.getEncodedNodeName(zkw, "task");
    SplitLogTask slt = new SplitLogTask.Unassigned(MANAGER);
    zkw.getRecoverableZooKeeper().create(task, slt.toByteArray(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

    waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 0, 1, WAIT_TIME);
    // now the worker is busy doing the above task

    // preempt the task, have it owned by another worker
    ZKUtil.setData(zkw, task, slt.toByteArray());
    waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 0, 1, WAIT_TIME);

    // create a RESCAN node
    String rescan = ZKSplitLog.getEncodedNodeName(zkw, "RESCAN");
    rescan = zkw.getRecoverableZooKeeper().create(rescan, slt.toByteArray(), Ids.OPEN_ACL_UNSAFE,
            CreateMode.PERSISTENT_SEQUENTIAL);

    waitForCounter(SplitLogCounters.tot_wkr_task_acquired, 1, 2, WAIT_TIME);
    // RESCAN node might not have been processed if the worker became busy
    // with the above task. preempt the task again so that now the RESCAN
    // node is processed
    ZKUtil.setData(zkw, task, slt.toByteArray());
    waitForCounter(SplitLogCounters.tot_wkr_preempt_task, 1, 2, WAIT_TIME);
    waitForCounter(SplitLogCounters.tot_wkr_task_acquired_rescan, 0, 1, WAIT_TIME);

    List<String> nodes = ZKUtil.listChildrenNoWatch(zkw, zkw.splitLogZNode);
    LOG.debug(nodes);
    int num = 0;
    for (String node : nodes) {
        num++;
        if (node.startsWith("RESCAN")) {
            String name = ZKSplitLog.getEncodedNodeName(zkw, node);
            String fn = ZKSplitLog.getFileName(name);
            byte[] data = ZKUtil.getData(zkw, ZKUtil.joinZNode(zkw.splitLogZNode, fn));
            slt = SplitLogTask.parseFrom(data);
            assertTrue(slt.toString(), slt.isDone(SRV));
        }
    }
    assertEquals(2, num);
}

---

From source file:uk.co.real_logic.aeron.tools.ThwackerTool.java

/**
 * Worker Thread Method:/*w  w w .j  a  va 2  s .com*/
 * Randomly selects a slot out of the publication array and creates a publication
 * if there isn't an active Publication there already
 */
public void createPubs() {
    final Random rand = SeedableThreadLocalRandom.current();

    while (running) {
        if (active) {
            //Get random pub slot
            final int i = rand.nextInt(numberOfPublications);
            final ThwackingElement pub = pubs[i];
            pub.tryAddPub();
        }
        Thread.yield();
    }
    allDone.countDown();
    LOG.fine("CreatePubs all done!");
}

---

From source file:org.apache.hadoop.hbase.stargate.TestRowResource.java

void doTestMultiCellGetPutXML() throws IOException, JAXBException {
    String path = "/" + TABLE + "/fakerow"; // deliberate nonexistent row

    CellSetModel cellSetModel = new CellSetModel();
    RowModel rowModel = new RowModel(ROW_1);
    rowModel.addCell(new CellModel(Bytes.toBytes(COLUMN_1), Bytes.toBytes(VALUE_1)));
    rowModel.addCell(new CellModel(Bytes.toBytes(COLUMN_2), Bytes.toBytes(VALUE_2)));
    cellSetModel.addRow(rowModel);// w ww.ja v  a2  s. c  om
    rowModel = new RowModel(ROW_2);
    rowModel.addCell(new CellModel(Bytes.toBytes(COLUMN_1), Bytes.toBytes(VALUE_3)));
    rowModel.addCell(new CellModel(Bytes.toBytes(COLUMN_2), Bytes.toBytes(VALUE_4)));
    cellSetModel.addRow(rowModel);
    StringWriter writer = new StringWriter();
    marshaller.marshal(cellSetModel, writer);
    Response response = client.put(path, MIMETYPE_XML, Bytes.toBytes(writer.toString()));
    Thread.yield();

    // make sure the fake row was not actually created
    response = client.get(path, MIMETYPE_XML);
    assertEquals(response.getCode(), 404);

    // check that all of the values were created
    checkValueXML(TABLE, ROW_1, COLUMN_1, VALUE_1);
    checkValueXML(TABLE, ROW_1, COLUMN_2, VALUE_2);
    checkValueXML(TABLE, ROW_2, COLUMN_1, VALUE_3);
    checkValueXML(TABLE, ROW_2, COLUMN_2, VALUE_4);

    response = deleteRow(TABLE, ROW_1);
    assertEquals(response.getCode(), 200);
    response = deleteRow(TABLE, ROW_2);
    assertEquals(response.getCode(), 200);
}

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From source file:com.apporiented.hermesftp.client.FtpTestClient.java

private void executeReceive(TextReceiver l) {
    Thread t = new Thread(l);
    t.start();/* w  w  w .ja  v a2 s.c  om*/
    while (t.isAlive()) {
        Thread.yield();
    }
}

---

From source file:org.geowebcache.georss.GeoRSSPollTask.java

protected void stopSeeding(boolean checkLiveCount) {
    if (this.seedTasks != null) {
        int liveCount = 0;
        for (GWCTask task : seedTasks) {
            if (task.getState() != STATE.DEAD && task.getState() != STATE.DONE) {
                task.terminateNicely();/*from   w  w w. j  av  a 2s .co m*/
                liveCount++;
            }
        }

        Thread.yield();

        for (GWCTask task : seedTasks) {
            if (task.getState() != STATE.DEAD && task.getState() != STATE.DONE) {
                liveCount++;
            }
        }

        if (!checkLiveCount || liveCount == 0) {
            return;
        }

        try {
            logger.debug("Found " + liveCount + " running seed threads. Waiting 3s for them to terminate.");
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        liveCount = 0;
        Iterator<GWCTask> iter = seedTasks.iterator();
        while (iter.hasNext()) {
            GWCTask task = iter.next();
            if (task.getState() != STATE.DEAD && task.getState() != STATE.DONE) {
                liveCount++;
            } else {
                iter.remove();
            }
        }
        if (liveCount > 0) {
            logger.info(liveCount + " seed jobs are still waiting to terminate, proceeding anyway.");
        }

    } else {
        logger.debug("Found no running seed jobs");
    }
}

---

From source file:org.apache.hadoop.hbase.rest.TestGetAndPutResource.java

@Test
public void testLatestCellGetJSON() throws IOException, JAXBException {
    final String path = "/" + TABLE + "/" + ROW_4 + "/" + COLUMN_1;
    CellSetModel cellSetModel = new CellSetModel();
    RowModel rowModel = new RowModel(ROW_4);
    CellModel cellOne = new CellModel(Bytes.toBytes(COLUMN_1), 1L, Bytes.toBytes(VALUE_1));
    CellModel cellTwo = new CellModel(Bytes.toBytes(COLUMN_1), 2L, Bytes.toBytes(VALUE_2));
    rowModel.addCell(cellOne);// w ww.j  a  v a 2  s.c om
    rowModel.addCell(cellTwo);
    cellSetModel.addRow(rowModel);
    String jsonString = jsonMapper.writeValueAsString(cellSetModel);
    Response response = client.put(path, Constants.MIMETYPE_JSON, Bytes.toBytes(jsonString));
    assertEquals(response.getCode(), 200);
    Thread.yield();
    response = client.get(path, Constants.MIMETYPE_JSON);
    assertEquals(response.getCode(), 200);
    assertEquals(Constants.MIMETYPE_JSON, response.getHeader("content-type"));
    CellSetModel cellSet = jsonMapper.readValue(response.getBody(), CellSetModel.class);
    assertTrue(cellSet.getRows().size() == 1);
    assertTrue(cellSet.getRows().get(0).getCells().size() == 1);
    CellModel cell = cellSet.getRows().get(0).getCells().get(0);
    assertEquals(VALUE_2, Bytes.toString(cell.getValue()));
    assertEquals(2L, cell.getTimestamp());
    response = deleteRow(TABLE, ROW_4);
    assertEquals(response.getCode(), 200);
}

---

From source file:org.apache.hadoop.hbase.rest.RowResourceBase.java

protected static Response checkAndDeleteXML(String url, String table, String row, String column,
        String valueToCheck, HashMap<String, String> cellsToDelete) throws IOException, JAXBException {
    RowModel rowModel = new RowModel(row);

    if (cellsToDelete != null) {
        for (Map.Entry<String, String> entry : cellsToDelete.entrySet()) {
            rowModel.addCell(new CellModel(Bytes.toBytes(entry.getKey()), Bytes.toBytes(entry.getValue())));
        }//from  ww  w .  j  a va2 s.  com
    }
    // Add this at the end
    rowModel.addCell(new CellModel(Bytes.toBytes(column), Bytes.toBytes(valueToCheck)));
    CellSetModel cellSetModel = new CellSetModel();
    cellSetModel.addRow(rowModel);
    StringWriter writer = new StringWriter();
    xmlMarshaller.marshal(cellSetModel, writer);
    Response response = client.put(url, Constants.MIMETYPE_XML, Bytes.toBytes(writer.toString()));
    Thread.yield();
    return response;
}

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