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:MyZone.Settings.java

public byte[] readXML(String filename) {
    byte[] readIn = null;
    FileChannel channel = null;/* ww  w.  j  a va2  s  .  c  om*/
    FileLock lock = null;
    FileInputStream fis = null;
    ByteArrayOutputStream baos = null;
    try {
        File file = new File(filename);
        if (!file.exists()) {
            return null;
        }
        fis = new FileInputStream(file);
        channel = fis.getChannel();
        while ((lock = channel.tryLock(0L, Long.MAX_VALUE, true)) == null) {
            Thread.yield();
        }
        baos = new ByteArrayOutputStream();
        byte[] b = new byte[1024];
        ByteBuffer buf = ByteBuffer.wrap(b);
        int count = 0;
        long fileLength = file.length();
        while (fileLength > 0) {
            count = channel.read(buf);
            if (count >= 0) {
                fileLength -= count;
                baos.write(b, 0, count);
                buf.rewind();
            }
        }
        readIn = baos.toByteArray();
    } catch (Exception e) {
        if (DEBUG) {
            e.printStackTrace();
        }
        readIn = null;
    } finally {
        try {
            if (lock != null) {
                lock.release();
            }
            if (channel != null) {
                channel.close();
            }
            if (fis != null) {
                fis.close();
            }
            if (baos != null) {
                baos.close();
            }
        } catch (Exception e) {
            if (DEBUG) {
                e.printStackTrace();
            }
            readIn = null;
        }
    }
    return readIn;
}

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

@Test
public void testMultiCellGetPutPB() throws IOException {
    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);// www.  j  a  v  a 2 s  .com
    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);
    Response response = client.put(path, Constants.MIMETYPE_PROTOBUF, cellSetModel.createProtobufOutput());
    Thread.yield();

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

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

---

From source file:com.nttec.everychan.chans.dvach.DvachModule.java

private void cssTest(String boardName, final CancellableTask task) throws Exception { /* =*.*= */
    class CSSCodeHolder {
        private volatile String cssCode = null;

        public synchronized void setCode(String code) {
            Logger.d(TAG, "set CSS code: " + code);
            if (cssCode == null)
                cssCode = code;//from w  w w .  j a  v  a 2s .c  o m
        }

        public boolean isSet() {
            return cssCode != null;
        }

        public String getCode() {
            return cssCode;
        }
    }
    class WebViewHolder {
        private WebView webView = null;
    }

    final CSSCodeHolder holder = new CSSCodeHolder();
    final WebViewHolder wv = new WebViewHolder();
    final String cssTest = HttpStreamer.getInstance().getStringFromUrl(
            getUsingUrl() + boardName + "/csstest.foo", HttpRequestModel.DEFAULT_GET, httpClient, null, task,
            false);
    long startTime = System.currentTimeMillis();

    Async.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            wv.webView = new WebView(MainApplication.getInstance());
            wv.webView.setWebViewClient(new WebViewClient() {
                @Override
                public void onLoadResource(WebView view, String url) {
                    if (url.contains("?code=") && !task.isCancelled()) {
                        holder.setCode(url.substring(url.indexOf("?code=") + 6));
                    }
                }
            });
            wv.webView.loadDataWithBaseURL("http://127.0.0.1/csstest.foo", cssTest, "text/html", "UTF-8", "");
        }
    });

    while (!holder.isSet()) {
        long time = System.currentTimeMillis() - startTime;
        if ((task != null && task.isCancelled()) || time > 5000)
            break;
        Thread.yield();
    }

    Async.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            try {
                wv.webView.stopLoading();
                wv.webView.clearCache(true);
                wv.webView.destroy();
            } catch (Exception e) {
                Logger.e(TAG, e);
            }
        }
    });

    if (task != null && task.isCancelled())
        throw new InterruptedException("interrupted");
    String cssCode = holder.getCode();
    if (cssCode != null) {
        HttpStreamer.getInstance().getBytesFromUrl(getUsingUrl() + boardName + "/csstest.foo?code=" + cssCode,
                HttpRequestModel.DEFAULT_GET, httpClient, null, task, false);
    }
}

---

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

@Test
public void testMetrics() throws IOException, JAXBException {
    final String path = "/" + TABLE + "/" + ROW_4 + "/" + COLUMN_1;
    Response response = client.put(path, Constants.MIMETYPE_BINARY, Bytes.toBytes(VALUE_4));
    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"));
    response = deleteRow(TABLE, ROW_4);/*  w  w w.j ava  2 s . c o  m*/
    assertEquals(response.getCode(), 200);

    UserGroupInformation ugi = User.getCurrent().getUGI();
    METRICS_ASSERT.assertCounterGt("requests", 2l, RESTServlet.getInstance(conf, ugi).getMetrics().getSource());

    METRICS_ASSERT.assertCounterGt("successfulGet", 0l,
            RESTServlet.getInstance(conf, ugi).getMetrics().getSource());

    METRICS_ASSERT.assertCounterGt("successfulPut", 0l,
            RESTServlet.getInstance(conf, ugi).getMetrics().getSource());

    METRICS_ASSERT.assertCounterGt("successfulDelete", 0l,
            RESTServlet.getInstance(conf, ugi).getMetrics().getSource());
}

---

From source file:com.palantir.atlasdb.transaction.impl.SnapshotTransactionTest.java

@Test
public void testTransactionAtomicity() throws Exception {
    // This test runs multiple transactions in parallel, with KeyValueService.put calls throwing
    // a RuntimeException from time to time and hanging other times. which effectively kills the
    // thread. We ensure that every transaction either adds 5 rows to the table or adds 0 rows
    // by checking at the end that the number of rows is a multiple of 5.
    final String tableName = "table";
    Random random = new Random(1);

    final UnstableKeyValueService unstableKvs = new UnstableKeyValueService(keyValueService, random);
    final TestTransactionManager unstableTransactionManager = new TestTransactionManagerImpl(unstableKvs,
            timestampService, lockClient, lockService, transactionService, conflictDetectionManager,
            sweepStrategyManager);//  w ww  .java2 s .  c  om

    ScheduledExecutorService service = PTExecutors.newScheduledThreadPool(20);

    for (int i = 0; i < 30; i++) {
        final int threadNumber = i;
        service.schedule(new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                if (threadNumber == 10) {
                    unstableKvs.setRandomlyThrow(true);
                }
                if (threadNumber == 20) {
                    unstableKvs.setRandomlyHang(true);
                }

                Transaction transaction = unstableTransactionManager.createNewTransaction();
                BatchingVisitable<RowResult<byte[]>> results = transaction.getRange(tableName,
                        RangeRequest.builder().build());

                final MutableInt nextIndex = new MutableInt(0);
                results.batchAccept(1,
                        AbortingVisitors.batching(new AbortingVisitor<RowResult<byte[]>, Exception>() {
                            @Override
                            public boolean visit(RowResult<byte[]> row) throws Exception {
                                byte[] dataBytes = row.getColumns().get("data".getBytes());
                                BigInteger dataValue = new BigInteger(dataBytes);
                                nextIndex.setValue(Math.max(nextIndex.toInteger(), dataValue.intValue() + 1));
                                return true;
                            }
                        }));

                // nextIndex now contains the least row number not already in the table. Add 5 more
                // rows to the table.
                for (int j = 0; j < 5; j++) {
                    int rowNumber = nextIndex.toInteger() + j;
                    Cell cell = Cell.create(("row" + rowNumber).getBytes(), "data".getBytes());
                    transaction.put(tableName,
                            ImmutableMap.of(cell, BigInteger.valueOf(rowNumber).toByteArray()));
                    Thread.yield();
                }
                transaction.commit();
                return null;
            }
        }, i * 20, TimeUnit.MILLISECONDS);
    }

    service.shutdown();
    service.awaitTermination(1, TimeUnit.SECONDS);

    // Verify each table has a number of rows that's a multiple of 5
    Transaction verifyTransaction = txManager.createNewTransaction();
    BatchingVisitable<RowResult<byte[]>> results = verifyTransaction.getRange(tableName,
            RangeRequest.builder().build());

    final MutableInt numRows = new MutableInt(0);
    results.batchAccept(1, AbortingVisitors.batching(new AbortingVisitor<RowResult<byte[]>, Exception>() {
        @Override
        public boolean visit(RowResult<byte[]> row) throws Exception {
            numRows.increment();
            return true;
        }
    }));

    Assert.assertEquals(0, numRows.toInteger() % 5);
}

---

From source file:ac.core.ConfigLoader.java

/**
 * showConfigNodes(...) method is used to recursively scan the XML config
 * file and display the nodes in tree format.
 *
 * @param parent/*  w  w  w . j  a v  a 2s  . c om*/
 * @param level level of the node, increased for each child-node to allow
 * tabbed tree display output
 *
 */
protected void showConfigNodes(org.w3c.dom.Node parent, int level) {
    // create a local class to display node value/text and associated
    // node attributes
    class SubShowNode {

        // loop through the node attributes for the node passed
        String displayNodeAttributes(org.w3c.dom.Node node) {
            // create string build object to support string concatanation
            StringBuilder sb = new StringBuilder();

            // retrieve node attributes (if any)
            ArrayList nAttributes = _xmlr.getNodeAttributes(node);

            // loop through the attributes array and append them to the
            // string builder object
            for (Object na : nAttributes) {
                // append the attribute details (key/text) to the string
                // builder object
                sb.append(" [ATTR=").append(((org.w3c.dom.Node) na).getNodeName()).append("//")
                        .append(((org.w3c.dom.Node) na).getNodeValue()).append("]");

                // yield processing to other threads
                Thread.yield();
            }

            // return the string builder representation as a string
            return sb.toString();
        }
    }

    // declare the showNode class to allow methods to reference the display
    // method to prevent duplicaion in code
    SubShowNode showNode = new SubShowNode();

    // retrieve the child nodes for processing
    ArrayList nodes = _xmlr.getNodeChildren(parent);

    // if node level is 1, then this is root node, display it with no
    // indentation
    if (level == 1) {
        // display the parent node name
        String data = StringUtils.repeat('~', level) + parent.getNodeName();

        // use the sub function to extract node attributes
        data += showNode.displayNodeAttributes(parent);

        // display all collected data to the user output
        System.out.println(data);
    }

    // parse the list of child nodes for the node being processed
    for (Object node : nodes) {
        // display the parent node name
        String data = StringUtils.repeat('\t', level) + ((org.w3c.dom.Node) node).getNodeName();

        // use the sub function to extract node attributes
        data += showNode.displayNodeAttributes((org.w3c.dom.Node) node);

        // if node has a text value, display the text
        if (_xmlr.getNodeText((org.w3c.dom.Node) node) != null) {
            data += " (TEXT=" + _xmlr.getNodeText((org.w3c.dom.Node) node) + ")";
        }

        // display all collected data to the user output
        System.out.println(data);

        // recall the function (recursion) to see if the node has child 
        // nodes and preocess them in hierarchial level
        showConfigNodes((org.w3c.dom.Node) node, (level + 1));

        // yield processing to other threads
        Thread.yield();
    }
}

---

From source file:com.alibaba.otter.node.etl.select.selector.canal.CanalEmbedSelector.java

private void applyWait(int emptyTimes) {
    int newEmptyTimes = emptyTimes > maxEmptyTimes ? maxEmptyTimes : emptyTimes;
    if (emptyTimes <= 3) { // 3
        Thread.yield();
    } else { // 3?sleep 10ms
        LockSupport.parkNanos(1000 * 1000L * newEmptyTimes);
    }/*from  ww  w  .  jav  a 2  s .  com*/
}

---

From source file:org.apache.cassandra.Util.java

public static void spinAssertEquals(Object expected, Supplier<Object> s, int timeoutInSeconds) {
    long now = System.currentTimeMillis();
    while (System.currentTimeMillis() - now < now + (1000 * timeoutInSeconds)) {
        if (s.get().equals(expected))
            break;
        Thread.yield();
    }//from w w  w  .  j  av a2 s  . c om
    assertEquals(expected, s.get());
}

---

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

private void executeSend(RawSender l) {
    Thread t = new Thread(l);
    t.start();
    while (t.isAlive()) {
        Thread.yield();
    }
}

---

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

protected static Response deleteValue(String table, String row, String column) throws IOException {
    StringBuilder path = new StringBuilder();
    path.append('/');
    path.append(table);/*www  .jav a 2  s  . co  m*/
    path.append('/');
    path.append(row);
    path.append('/');
    path.append(column);
    Response response = client.delete(path.toString());
    Thread.yield();
    return response;
}

---

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