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.gsoft.admin.ScriptRunner.java

/**
 * Runs an SQL script (read in using the Reader parameter) using the
 * connection passed in//from   w ww.  j a  v a  2s.  c om
 * 
 * @param conn
 *            - the connection to use for the script
 * @param reader
 *            - the source of the script
 * @throws SQLException
 *             if any SQL errors occur
 * @throws IOException
 *             if there is an error reading from the Reader
 */
private void runScript(Connection conn, Reader reader) throws IOException, SQLException {
    StringBuffer command = null;
    try {
        LineNumberReader lineReader = new LineNumberReader(reader);
        String line = null;
        while ((line = lineReader.readLine()) != null) {
            if (command == null) {
                command = new StringBuffer();
            }
            String trimmedLine = line.trim();
            if (trimmedLine.startsWith("--")) {
                println(trimmedLine);
            } else if (trimmedLine.length() < 1 || trimmedLine.startsWith("//")) {
                // Do nothing
            } else if (trimmedLine.length() < 1 || trimmedLine.startsWith("--")) {
                // Do nothing
            } else if (!fullLineDelimiter && trimmedLine.endsWith(getDelimiter())
                    || fullLineDelimiter && trimmedLine.equals(getDelimiter())) {
                command.append(line.substring(0, line.lastIndexOf(getDelimiter())));
                command.append(" ");
                Statement statement = conn.createStatement();

                println(command);

                boolean hasResults = false;
                if (stopOnError) {
                    hasResults = statement.execute(command.toString());
                } else {
                    try {
                        statement.execute(command.toString());
                    } catch (SQLException e) {
                        e.fillInStackTrace();
                        printlnError("Error executing: " + command);
                        printlnError(e);
                    }
                }

                if (autoCommit && !conn.getAutoCommit()) {
                    conn.commit();
                }

                ResultSet rs = statement.getResultSet();
                if (hasResults && rs != null) {
                    ResultSetMetaData md = rs.getMetaData();
                    int cols = md.getColumnCount();
                    for (int i = 0; i < cols; i++) {
                        String name = md.getColumnLabel(i);
                        print(name + "\t");
                    }
                    println("");
                    while (rs.next()) {
                        for (int i = 0; i < cols; i++) {
                            String value = rs.getString(i);
                            print(value + "\t");
                        }
                        println("");
                    }
                }

                command = null;
                try {
                    statement.close();
                } catch (Exception e) {
                    // Ignore to workaround a bug in Jakarta DBCP
                }
                Thread.yield();
            } else {
                command.append(line);
                command.append(" ");
            }
        }
        if (!autoCommit) {
            conn.commit();
        }
    } catch (SQLException e) {
        e.fillInStackTrace();
        printlnError("Error executing: " + command);
        printlnError(e);
        throw e;
    } catch (IOException e) {
        e.fillInStackTrace();
        printlnError("Error executing: " + command);
        printlnError(e);
        throw e;
    } finally {
        conn.rollback();
        flush();
    }
}

---

From source file:org.sakaiproject.search.indexer.impl.test.SequenceGeneratorDisabled.java

/**
 * Test method for/*from   w w w.  j  a  va 2 s .  c  o m*/
 * {@link org.sakaiproject.search.transaction.impl.TransactionSequenceImpl#getNextId()}.
 */
public final void testGetNextIdWrapped() {
    sequenceGenerator.setMinValue(10);
    sequenceGenerator.setMaxValue(200);
    log.info("================================== " + this.getClass().getName() + ".testGetNextId");
    nt = 0;
    fail = 0;
    last = 0;
    for (int i = 0; i < 20; i++) {
        Thread t = new Thread(new Runnable() {

            public void run() {
                try {
                    nt++;
                    long n = 0;
                    long locallast = 0;
                    Map<Long, Long> seq = new HashMap<Long, Long>();
                    for (int i = 0; i < 1000; i++) {
                        n = sequenceGenerator.getNextId();
                        if (n < last) {
                            log.debug("Wrapped " + last + ":" + n);
                            m = new ConcurrentHashMap<Long, Long>();
                        }
                        if (n < locallast) {
                            log.debug("Wrapped Local" + locallast + ":" + n);
                            seq = new HashMap<Long, Long>();
                        }
                        last = n;
                        locallast = n;
                        if (seq.get(n) != null) {
                            fail = n;
                            fail("Local clash on " + n);

                        }
                        seq.put(n, n);
                    }
                    log.debug("Last " + n);
                    for (long nx : seq.values()) {
                        if (m.get(nx) != null) {
                            fail = nx;
                            fail("Concurrent clash on " + nx);
                        }
                        m.put(nx, nx);
                    }
                } finally {
                    nt--;
                }

            }

        });
        t.start();
    }
    while (nt > 0) {
        if (fail != 0) {
            fail("Failed with clash on " + fail);
        }
        Thread.yield();
    }
    log.info("==PASSED========================== " + this.getClass().getName() + ".testGetNextId");

}

---

From source file:org.xmetdb.rest.protocol.attachments.CallableAttachmentImporter.java

protected RemoteTask wait(RemoteTask task, long now) throws Exception {
    if (task.getError() != null)
        throw task.getError();
    if (task.getResult() == null)
        throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST,
                String.format("%s returns empty contend instead of URI"));
    String result = task.getResult().toString();
    FibonacciSequence sequence = new FibonacciSequence();
    while (!task.poll()) {
        if (task.getError() != null)
            throw task.getError();
        Thread.sleep(sequence.sleepInterval(pollInterval, true, 1000 * 60 * 5));
        Thread.yield();
        if ((System.currentTimeMillis() - now) > pollTimeout)
            throw new ResourceException(Status.SERVER_ERROR_GATEWAY_TIMEOUT, String.format("%s %s ms > %s ms",
                    result == null ? task.getUrl() : result, System.currentTimeMillis() - now, pollTimeout));
    }/*from   w  w w  . j  a  v a2  s. c  o m*/

    if (task.getError() != null)
        if (task.getError() instanceof ResourceException)
            throw new ResourceException(Status.SERVER_ERROR_BAD_GATEWAY,
                    String.format("%s %d %s", result == null ? task.getUrl() : result,
                            ((ResourceException) task.getError()).getStatus().getCode(),
                            task.getError().getMessage()),
                    task.getError());
        else
            throw new ResourceException(
                    Status.SERVER_ERROR_BAD_GATEWAY, String.format("%s %s",
                            result == null ? task.getUrl() : result, task.getError().getMessage()),
                    task.getError());

    return task;
}

---

From source file:com.github.maven_nar.NarUtil.java

public static void deleteDirectory(final File dir) throws MojoExecutionException {
    int retries = OS.WINDOWS.equalsIgnoreCase(System.getProperty("os.name")) ? 3 : 1; // Windows file locking (such as due to virus scanners) and sometimes deleting slowly, or slow to report completion.
    while (retries > 0) {
        retries--;/*from ww w.  ja va  2  s. c  om*/
        try {
            FileUtils.deleteDirectory(dir);
            retries = 0;
        } catch (final IOException e) {
            if (retries > 0) {
                Thread.yield();
            } else {
                throw new MojoExecutionException("Could not delete directory: " + dir, e);
            }
        }
        if (retries > 0) {
            //      getLog().info("Could not delete directory: " + dir + " : Retrying");
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
            }
            //TODO: if( windows and interactive ) prompt for retry?
            //@Component(role=org.codehaus.plexus.components.interactivity.Prompter.class, hint="archetype")
            //public class ArchetypePrompter
        }
    }
}

---

From source file:eu.openanalytics.rsb.EmailDepositITCase.java

private MimeMessage[] waitForRsbResponse() throws InterruptedException {
    MimeMessage[] receivedMessages = fetchMessagesFromUserMailBox();

    int attemptCount = 0;
    while ((receivedMessages.length == 0) && (attemptCount++ < 120)) {
        Thread.yield();
        Thread.sleep(250);/*from   ww  w  . j  av a  2  s  . c om*/
        receivedMessages = fetchMessagesFromUserMailBox();
    }
    return receivedMessages;
}

---

From source file:org.apache.streams.datasift.provider.DatasiftStreamProvider.java

@Override
//This is a hack.  It is only like this because of how perpetual streams work at the moment.  Read list server to debate/vote for new interfaces.
public StreamsResultSet readCurrent() {
    Queue<StreamsDatum> datums = Queues.newConcurrentLinkedQueue();
    StreamsDatum datum = null;//from w w w  . j  a  v  a2 s  .  c o m
    Interaction interaction;
    while (!this.interactions.isEmpty()) {
        interaction = this.interactions.poll();
        try {
            datum = new StreamsDatum(this.mapper.writeValueAsString(interaction.getData()),
                    interaction.getData().get("interaction").get("id").textValue());
        } catch (JsonProcessingException jpe) {
            LOGGER.error("Exception while converting Interaction to String : {}", jpe);
        }
        if (datum != null) {
            while (!datums.offer(datum)) {
                Thread.yield();
            }
        }

    }
    return new StreamsResultSet(datums);
}

---

From source file:org.sonatype.nexus.testsuite.obr.ObrITSupport.java

private void waitFor(final InputStream input, final String expectedLine) throws Exception {
    final long startMillis = System.currentTimeMillis();
    final StringBuilder content = new StringBuilder();
    do {//  w w w.  j a  va2 s . co  m
        final int available = input.available();
        if (available > 0) {
            final byte[] bytes = new byte[available];
            input.read(bytes);
            final String current = new String(bytes);
            System.out.print(current);
            content.append(current);
            Thread.yield();
        } else if (System.currentTimeMillis() - startMillis > 5 * 60 * 1000) {
            throw new InterruptedException(); // waited for more than 5 minutes
        } else {
            try {
                Thread.sleep(100);
            } catch (final InterruptedException e) {
                // continue...
            }
        }
    } while (content.indexOf(expectedLine) == -1);
    System.out.println();
}

---

From source file:com.indeed.lsmtree.core.TestImmutableBTreeIndex.java

public void testRandom() throws Exception {
    final int[] ints = createTree();
    final ImmutableBTreeIndex.Reader<Integer, Long> reader = new ImmutableBTreeIndex.Reader(tmpDir,
            new IntSerializer(), new LongSerializer(), false);
    final int max = ints[ints.length - 1];
    final AtomicInteger done = new AtomicInteger(8);
    for (int i = 0; i < 8; i++) {
        final int index = i;
        new Thread(new Runnable() {
            @Override//from  w  w  w.j  ava 2s. c om
            public void run() {
                try {
                    final Random r = new Random(index);
                    for (int i = 0; i < treeSize; i++) {
                        int rand = r.nextInt(max + 1);
                        int insertionindex = Arrays.binarySearch(ints, rand);
                        final Iterator<Generation.Entry<Integer, Long>> iterator = reader.iterator(rand, true);
                        try {
                            assertTrue(iterator.hasNext());
                        } catch (Throwable t) {
                            System.err.println("rand: " + rand);
                            throw Throwables.propagate(t);
                        }
                        Generation.Entry<Integer, Long> entry = iterator.next();
                        assertTrue("entry: " + entry + " rand: " + rand, entry.getKey() >= rand);
                        assertTrue(entry.getKey().longValue() == entry.getValue());
                        if (insertionindex >= 0) {
                            assertTrue(rand == ints[insertionindex]);
                            assertTrue(entry.getKey() == rand);
                            Generation.Entry<Integer, Long> result = reader.get(rand);
                            assertTrue(result.getValue() == rand);
                        } else {
                            if (insertionindex != -1)
                                assertTrue(ints[(~insertionindex) - 1] < rand);
                            assertTrue(
                                    "insertionindex: " + insertionindex + " entry: " + entry
                                            + " ints[!insertionindex]" + ints[~insertionindex],
                                    ints[~insertionindex] == entry.getKey());
                            Generation.Entry<Integer, Long> result = reader.get(rand);
                            assertTrue(result == null);
                        }
                    }
                } finally {
                    done.decrementAndGet();
                }
            }
        }).start();
    }
    while (done.get() > 0) {
        Thread.yield();
    }
    reader.close();
}

---

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

Response putValuePB(String table, String row, String column, String value) throws IOException {
    StringBuilder path = new StringBuilder();
    path.append('/');
    path.append(table);/*from  ww w. j a va  2s.  c  om*/
    path.append('/');
    path.append(row);
    path.append('/');
    path.append(column);
    RowModel rowModel = new RowModel(row);
    rowModel.addCell(new CellModel(Bytes.toBytes(column), Bytes.toBytes(value)));
    CellSetModel cellSetModel = new CellSetModel();
    cellSetModel.addRow(rowModel);
    Response response = client.put(path.toString(), MIMETYPE_PROTOBUF, cellSetModel.createProtobufOutput());
    Thread.yield();
    return response;
}

---

From source file:BenchmarkApplet.java

public synchronized void println(String s) {
      if (console.getState())
          System.out.println(s);/* ww  w  .j  a v a  2s  . co  m*/
      out.appendText(s + newline);
      clear.enable();
      Thread.yield(); // give interface a chance to process events
  }

---

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