Example usage for java.nio ByteBuffer allocateDirect

Introduction

In this page you can find the example usage for java.nio ByteBuffer allocateDirect.

Prototype

public static ByteBuffer allocateDirect(int capacity) 

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

From source file:de.ailis.threedee.utils.BufferUtils.java

/**
 * Converts the specified integer buffer to native endian and returns this
 * new buffer. If buffer is already in correct endian format then it is
 * returned right away./*from w  ww .j  a  v  a 2  s  .c  o  m*/
 *
 * @param buffer
 *            The integer buffer to convert
 * @return The converted integer buffer or the source buffer if no
 *         conversion is needed
 */

public static IntBuffer convertToNativeEndian(final IntBuffer buffer) {
    if (buffer.order() == ByteOrder.nativeOrder())
        return buffer;

    final ByteBuffer bytes = ByteBuffer.allocateDirect(buffer.capacity());
    bytes.order(ByteOrder.nativeOrder());
    final IntBuffer ints = bytes.asIntBuffer();
    ints.put(buffer).rewind();
    return ints;
}

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From source file:org.neo4j.io.pagecache.impl.SingleFilePageSwapperTest.java

@Test
public void swappingInMustFillPageWithData() throws IOException {
    byte[] bytes = new byte[] { 1, 2, 3, 4 };
    StoreChannel channel = getFs().create(getFile());
    channel.writeAll(wrap(bytes));//w w w .jav a 2  s. com
    channel.close();

    PageSwapperFactory factory = swapperFactory();
    PageSwapper swapper = createSwapper(factory, getFile(), 4, null, false);
    ByteBuffer target = ByteBuffer.allocateDirect(4);
    ByteBufferPage page = new ByteBufferPage(target);
    swapper.read(0, page);

    assertThat(array(target), byteArray(bytes));
}

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From source file:io.hops.erasure_coding.NativeReedSolomonCode.java

@Override
public void decodeBulk(byte[][] readBufs, byte[][] writeBufs, int[] erasedLocations, int[] locationsToRead,
        int[] locationsNotToRead) {

    ByteBuffer[] breadBufs = new ByteBuffer[readBufs.length];
    ByteBuffer[] bwriteBufs = new ByteBuffer[locationsNotToRead.length];

    int size = readBufs[0].length;

    int[] inputOffsets = new int[readBufs.length];
    int[] outputOffsets = new int[locationsNotToRead.length];

    //init parities
    for (int i = 0; i < paritySize; i++) {
        breadBufs[i + stripeSize] = ByteBuffer.allocateDirect(size);
        for (int j = 0; j < size; j++) {
            breadBufs[i + stripeSize].put(readBufs[i][j]);
        }//from ww  w. j  a v a  2s . co m
        breadBufs[i + stripeSize].flip();
    }

    //init data
    for (int i = 0; i < stripeSize; i++) {
        breadBufs[i] = ByteBuffer.allocateDirect(size);
        for (int j = 0; j < size; j++) {
            breadBufs[i].put(readBufs[i + paritySize][j]);
        }
        breadBufs[i].flip();
    }

    int[] modifiedLocationsNotRead = new int[locationsNotToRead.length];

    for (int i = 0; i < locationsNotToRead.length; i++) {
        int location = locationsNotToRead[i];
        if (location < paritySize) {
            //then this is parity
            breadBufs[location + stripeSize] = null;
            modifiedLocationsNotRead[i] = location + stripeSize;
        } else {
            //then this is data
            breadBufs[location - paritySize] = null;
            modifiedLocationsNotRead[i] = location - paritySize;
        }
    }

    Arrays.sort(modifiedLocationsNotRead);

    //allocate writebufs
    for (int i = 0; i < modifiedLocationsNotRead.length; i++) {
        bwriteBufs[i] = ByteBuffer.allocateDirect(size);
    }

    decoder.performDecodeImpl(breadBufs, inputOffsets, size, modifiedLocationsNotRead, bwriteBufs,
            outputOffsets);

    for (int i = 0; i < writeBufs.length; i++) {
        for (int j = 0; j < size; j++) {
            writeBufs[i][j] = bwriteBufs[i].get();
        }
    }
}

---

From source file:com.hadoop.compression.fourmc.zstd.ZstdStreamDecompressor.java

/**
 * Creates a new ZstdStreamDecompressor.
 *
 *///  w  w  w .j a va2s  .  c  o m
public ZstdStreamDecompressor() {
    dStream = createDStream();

    /*
     * Notice for developers:
     * Is a direct buffer pool needed here?
     * The iBuffSize and oBuffSize is about ~128K, which is way smaller than 4MB. Take the community Lz4Compressor
     * for reference, allocateDirect shall not trigger a java.lang.OutOfMemoryError: Direct Buffer Memory exception.
     *
     * We can use a direct buffer pool if needed.
     */
    iBuff = ByteBuffer.allocateDirect(iBuffSize);
    oBuff = ByteBuffer.allocateDirect(oBuffSize);
    reset();
}

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From source file:xbird.util.nio.RemoteMemoryMappedFile.java

public RemoteMemoryMappedFile(int port, String filePath, int pageSize, boolean alloc, boolean bigEndian) {
    this._sockAddr = new InetSocketAddress(NetUtils.getLocalHost(), port);
    this._filePath = filePath;
    this._pageSize = pageSize;
    this._bigEndian = bigEndian;
    this._maxBulkFetchSize = pageSize * (MemoryMappedDocumentTable.CACHED_PAGES / 4);
    this._rcvbuf = alloc ? ByteBuffer.allocateDirect(pageSize) : null;
}

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From source file:org.apache.xmlgraphics.util.io.Base64Test.java

/**
 * Returns true if the contents of <tt>is1</tt> match the contents of
 * <tt>is2</tt>/*from w ww  .ja  v  a 2 s. c  o  m*/
 *
 * @throws IOException
 */
public static boolean compareStreams(final InputStream i1, final InputStream i2, final boolean skipws)
        throws IOException {
    try (final ReadableByteChannel ch1 = Channels.newChannel(i1)) {
        try (final ReadableByteChannel ch2 = Channels.newChannel(i2)) {

            final ByteBuffer buf1 = ByteBuffer.allocateDirect(1024);
            final ByteBuffer buf2 = ByteBuffer.allocateDirect(1024);

            while (true) {

                final int n1 = ch1.read(buf1);
                final int n2 = ch2.read(buf2);

                if (n1 == -1 || n2 == -1) {
                    return n1 == n2;
                }

                buf1.flip();
                buf2.flip();

                for (int i = 0; i < Math.min(n1, n2); ++i) {
                    if (buf1.get() != buf2.get()) {
                        return false;
                    }
                }

                buf1.compact();
                buf2.compact();
            }
        }
    }
}

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From source file:com.github.c77.base_driver.kobuki.KobukiBaseDevice.java

private void updateReceivedData(final byte[] bytes) {
    int readBytes = bytes.length;
    packetReader.newPacket(ByteBuffer.allocateDirect(readBytes).put(bytes, 0, readBytes));
    baseStatus = packetParser.parseBaseStatus(packetReader.getSensorPacket());
    odometryStatus.update(baseStatus);/*from  www . j  av  a2  s . com*/
}

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From source file:uk.co.real_logic.aeron.tools.perf_tools.AeronLatencyUnderLoadPublisher.java

public AeronLatencyUnderLoadPublisher(final String[] args) {
    try {//from  ww  w .  j av a2 s  .c  o m
        parseArgs(args);
    } catch (final ParseException e) {
        throw new RuntimeException(e);
    }
    final Aeron.Context ctx = new Aeron.Context().newConnectionHandler(this::connectionHandler);
    fragmentHandler = new FragmentAssemblyAdapter(this::msgHandler);
    final Aeron aeron = Aeron.connect(ctx);
    System.out.println("Reflect: " + reflectChannel + " Pub: " + pubChannel);
    pub = aeron.addPublication(pubChannel, pubStreamId);
    sub = aeron.addSubscription(reflectChannel, subStreamId);
    connectionLatch = new CountDownLatch(1);
    final IdleStrategy idle = new BusySpinIdleStrategy();
    bufferClaim = new BufferClaim();

    final List<RateControllerInterval> intervals = new ArrayList<>();
    intervals.add(new MessagesAtMessagesPerSecondInterval(100, 10));
    intervals.add(new MessagesAtMessagesPerSecondInterval(1000, 100));
    intervals.add(new MessagesAtMessagesPerSecondInterval(10000, 1000));
    intervals.add(new MessagesAtMessagesPerSecondInterval(100000, 10000));
    intervals.add(new MessagesAtMessagesPerSecondInterval(1000000, 100000));
    intervals.add(new MessagesAtMessagesPerSecondInterval(10000000, 1000000));
    intervals.add(new MessagesAtMessagesPerSecondInterval(30000000, 3000000));
    buffer = new UnsafeBuffer(ByteBuffer.allocateDirect(msgLen));
    msgCount = 0;

    RateController rateController = null;
    try {
        rateController = new RateController(this, intervals);
    } catch (final Exception ex) {
        throw new RuntimeException(ex);
    }

    final Runnable task = () -> {
        while (running) {
            while (sub.poll(fragmentHandler, 1) <= 0 && running) {
            }
        }
        System.out.println("Done");
    };
    final Thread subThread = new Thread(task);
    subThread.start();

    try {
        connectionLatch.await();
    } catch (final InterruptedException e) {
        e.printStackTrace();
    }

    final int warmUpMsgs = 100000;
    for (int i = 0; i < warmUpMsgs; i++) {
        while (pub.tryClaim(buffer.capacity(), bufferClaim) < 0L) {
            idle.idle(1);
        }
        final MutableDirectBuffer buffer = bufferClaim.buffer();
        final int offset = bufferClaim.offset();
        buffer.putByte(offset, (byte) 'w');
        bufferClaim.commit();
    }
    try {
        Thread.sleep(1000);
    } catch (final InterruptedException e) {
        e.printStackTrace();
    }
    System.out.println("warmup msgs received: " + warmups);
    final int start = (int) System.currentTimeMillis();
    while (rateController.next()) {

    }
    final int total = (int) (System.currentTimeMillis() - start) / 1000;
    buffer.putByte(0, (byte) 'q');

    while (pub.offer(buffer, 0, buffer.capacity()) < 0L) {
        idle.idle(0);
    }

    System.out.println("Duration: " + total + " seconds");
    try {
        Thread.sleep(1000);
    } catch (final InterruptedException e) {
        e.printStackTrace();
    }

    running = false;

    try {
        subThread.join();
    } catch (final InterruptedException e) {
        e.printStackTrace();
    }

    aeron.close();

    try {
        computeStats();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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From source file:com.bennavetta.appsite.file.ResourceService.java

private void copy(ReadableByteChannel src, WritableByteChannel dest) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize.get());
    while (src.read(buffer) != -1 || buffer.position() != 0) {
        buffer.flip();//from   w  w w.  ja v a 2  s  . c  om
        dest.write(buffer);
        buffer.compact();
    }
}

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From source file:com.alvermont.terraj.fracplanet.geom.TriangleBufferArray.java

/** Creates a new instance of TriangleBufferArray */
public TriangleBufferArray() {
    this.buffer = ByteBuffer.allocateDirect(DEFAULT_CAPACITY * INTS_PER_ENTRY * SIZEOF_INT)
            .order(ByteOrder.nativeOrder()).asIntBuffer();
    this.buffer.limit(0);
}

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