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:Main.java

public static DoubleBuffer createDoubleBuffer(final int size) {
    final DoubleBuffer buf = ByteBuffer.allocateDirect(8 * size).order(ByteOrder.nativeOrder())
            .asDoubleBuffer();//from w  w w .j  av  a 2  s  .c o  m
    buf.clear();
    return buf;
}

From source file:org.apache.hadoop.io.compress.bzip2.Bzip2Decompressor.java

/**
 * Creates a new decompressor.//from   w ww. ja v  a  2s .c  o  m
 */
public Bzip2Decompressor(boolean conserveMemory, int directBufferSize) {
    this.conserveMemory = conserveMemory;
    this.directBufferSize = directBufferSize;
    compressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
    uncompressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
    uncompressedDirectBuf.position(directBufferSize);

    stream = init(conserveMemory ? 1 : 0);
}

From source file:net.lightbody.bmp.proxy.jetty.http.nio.SocketChannelOutputStream.java

/** Constructor.
 * 
 */
public SocketChannelOutputStream(SocketChannel channel, int bufferSize) {
    _channel = channel;
    _buffer = ByteBuffer.allocateDirect(bufferSize);
}

From source file:org.apache.hadoop.mapred.nativetask.NativeBatchProcessor.java

public NativeBatchProcessor(Class<IK> iKClass, Class<IV> iVClass, Class<OK> oKClass, Class<OV> oVClass,
        String nativeHandlerName, int inputBufferCapacity, int outputBufferCapacity) throws IOException {
    if (inputBufferCapacity > 0) {
        this.inputBuffer = ByteBuffer.allocateDirect(inputBufferCapacity);
        this.inputBuffer.order(ByteOrder.BIG_ENDIAN);
    }/*from  w ww .ja v  a2 s. c om*/
    if (outputBufferCapacity > 0) {
        this.outputBuffer = ByteBuffer.allocateDirect(outputBufferCapacity);
        this.outputBuffer.order(ByteOrder.BIG_ENDIAN);
    }
    this.nativeHandlerName = nativeHandlerName;

    this.nativeReader = new NativeInputStream(outputBuffer);
    this.nativeWriter = new NativeOutputStream(inputBuffer) {

        @Override
        public void flush() throws IOException {
            flushInputAndProcess();
        }

        @Override
        public void close() throws IOException {
            finishInput();
        }

    };

    if (null != iKClass && null != iVClass) {
        this.serializer = new KVSerializer<IK, IV>(iKClass, iVClass);
    }
    if (null != oKClass && null != oVClass) {
        this.deserializer = new KVSerializer<OK, OV>(oKClass, oVClass);
    }
}

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

/**
 * Converts the specified float 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 float buffer to convert
 * @return The converted float buffer or the source buffer if no conversion
 *         is needed
 */

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

    if (log.isTraceEnabled())
        log.trace("Converting endianess of " + buffer.capacity() + " floats");

    final ByteBuffer bytes = ByteBuffer.allocateDirect(buffer.capacity());
    bytes.order(ByteOrder.nativeOrder());
    final FloatBuffer floats = bytes.asFloatBuffer();
    floats.put(buffer).rewind();
    return floats;
}

From source file:net.jenet.Packet.java

/**
 * Creates a new Packet./* ww w  .ja  v  a 2  s  .  c  o m*/
 * The constructor allocates a new packet and allocates a
 * buffer of <code>dataLength</code> bytes for it.
 * 
 * @param dataLength
 *                      The size in bytes of this packet.
 * @param flags
 *                      An byte inidicating the how to handle this packet.
 */
public Packet(int dataLength, int flags) {
    data = ByteBuffer.allocateDirect(dataLength);
    this.dataLength = dataLength;
    this.flags = flags;
}

From source file:org.apache.tajo.tuple.BaseTupleBuilder.java

public void ensureSize(int size) {
    if (buffer.remaining() - size < 0) { // check the remain size
        // enlarge new buffer and copy writing data
        int newBlockSize = UnsafeUtil.alignedSize(buffer.capacity() * 2);
        ByteBuffer newByteBuf = ByteBuffer.allocateDirect(newBlockSize);
        long newAddress = ((DirectBuffer) newByteBuf).address();
        UNSAFE.copyMemory(this.address, newAddress, buffer.limit());
        LOG.debug("Increase the buffer size to " + FileUtil.humanReadableByteCount(newBlockSize, false));

        // release existing buffer and replace variables
        UnsafeUtil.free(buffer);//from w  w w  .j a  v  a 2  s. c  o m
        buffer = newByteBuf;
        address = newAddress;
    }
}

From source file:org.apache.hadoop.util.NativeJerasure.java

private static ByteBuffer directify(byte[] readBufs, int dataStart, int dataLen) {
    ByteBuffer newBuf = null;//from  w  ww .  j av a  2s . c o m
    newBuf = ByteBuffer.allocateDirect(dataLen);
    newBuf.position(0);
    newBuf.mark();
    newBuf.put(readBufs, dataStart, dataLen);
    newBuf.reset();
    newBuf.limit(dataLen);
    return newBuf;
}

From source file:com.sunchenbin.store.feilong.core.io.IOReaderUtil.java

/**
 * ?.//from   w w w.  ja v a 2  s.co  m
 *
 * @param file
 *            
 * @param charsetName
 *            ?,isNullOrEmpty, {@link CharsetType#UTF8}
 * @return the file content
 * @see org.apache.commons.io.FileUtils#readFileToString(File, Charset)
 */
public static String getFileContent(File file, String charsetName) {
    if (Validator.isNullOrEmpty(file)) {
        throw new NullPointerException("the file is null or empty!");
    }
    // ?
    final int capacity = 186140;
    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(capacity);
    StringBuilder sb = new StringBuilder(capacity);

    FileInputStream fileInputStream = null;
    try {
        fileInputStream = new FileInputStream(file);

        // ?????.
        FileChannel fileChannel = fileInputStream.getChannel();
        String useCharsetName = Validator.isNullOrEmpty(charsetName) ? DEFAULT_CHARSET_NAME : charsetName;
        Charset charset = Charset.forName(useCharsetName);
        while (fileChannel.read(byteBuffer) != -1) {
            // ??
            byteBuffer.flip();
            CharBuffer charBuffer = charset.decode(byteBuffer);
            sb.append(charBuffer.toString());
            byteBuffer.clear();
        }
        return sb.toString();

    } catch (FileNotFoundException e) {
        throw new UncheckedIOException(e);
    } catch (IOException e) {
        throw new UncheckedIOException(e);
    } finally {
        // ? ,^_^
        IOUtils.closeQuietly(fileInputStream);
    }
}

From source file:org.apache.james.mpt.session.ExternalSession.java

public ExternalSession(SocketChannel socket, Monitor monitor, String shabang, boolean debug) {
    super();//from  ww w . j a  va2  s .  co m
    this.socket = socket;
    this.monitor = monitor;
    readBuffer = ByteBuffer.allocateDirect(2048);
    ascii = Charset.forName("US-ASCII");
    lineEndBuffer = ByteBuffer.wrap(CRLF);
    this.shabang = shabang;
}