Example usage for java.nio ByteBuffer clear

List of usage examples for java.nio ByteBuffer clear

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Introduction

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

Prototype

public final Buffer clear()

Source Link

Document

Clears this buffer.

Usage

From source file:com.alibaba.otter.shared.common.utils.NioUtilsPerformance.java

public static void channelTest(File source, File target) throws Exception {
    FileInputStream fis = null;/*w ww.j a  va2  s .  com*/
    FileOutputStream fos = null;
    try {
        fis = new FileInputStream(source);
        fos = new FileOutputStream(target);
        FileChannel sChannel = fis.getChannel();
        FileChannel tChannel = fos.getChannel();

        target.createNewFile();

        ByteBuffer buffer = ByteBuffer.allocate(16 * 1024);
        while (sChannel.read(buffer) > 0) {
            buffer.flip();
            tChannel.write(buffer);
            buffer.clear();
        }

        tChannel.close();
        sChannel.close();
    } finally {
        IOUtils.closeQuietly(fis);
        IOUtils.closeQuietly(fos);
    }
}

From source file:gridool.communication.transport.nio.GridNioServer.java

private static void handleRead(final SocketChannel channel, final SelectionKey key,
        final ByteBuffer sharedReadBuf, final GridTransportListener notifier, final ExecutorService exec) {
    sharedReadBuf.clear();
    final SocketAddress remoteAddr = channel.socket().getRemoteSocketAddress();
    final int bytesRead;
    try {/*from  w ww .ja  v a 2 s.c  om*/
        bytesRead = channel.read(sharedReadBuf);
    } catch (IOException e) {
        LOG.warn("Failed to read data from client: " + remoteAddr, e);
        NIOUtils.close(key);
        return;
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug("Read " + bytesRead + " bytes from a client socket: " + remoteAddr);
    }
    if (bytesRead == -1) {
        if (LOG.isTraceEnabled()) {
            LOG.trace("Remote client closed connection: " + remoteAddr);
        }
        NIOUtils.close(key);
        return;
    } else if (bytesRead == 0) {
        return;
    }

    final GridMessageBuffer msgBuf = (GridMessageBuffer) key.attachment();
    sharedReadBuf.flip();
    while (sharedReadBuf.remaining() > 0) {
        msgBuf.read(sharedReadBuf);
        if (msgBuf.isFilled()) {
            exec.execute(new Runnable() {
                public void run() {
                    final GridCommunicationMessage msg = msgBuf.toMessage();
                    msgBuf.reset();
                    if (LOG.isInfoEnabled()) {
                        LOG.info("Recieved a GridCommunicationMessage [" + msg.getMessageId() + "]");
                    }
                    notifier.notifyListener(msg);
                }
            });
            break;
        }
    }
}

From source file:io.uploader.drive.util.FileUtils.java

public static String readAllAndgetMD5(InputStream in) throws IOException {
    com.google.common.hash.HashingInputStream his = null;
    try {/*from w ww  . j  ava2  s .  co  m*/
        his = new com.google.common.hash.HashingInputStream(Hashing.md5(), in);

        final int bufferSize = 2097152;
        final ReadableByteChannel inputChannel = Channels.newChannel(his);
        final ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
        while (inputChannel.read(buffer) != -1) {
            buffer.clear();
        }
        /*
        byte[] bytesBuffer = new byte[bufferSize] ;
        int r = his.read(bytesBuffer, 0, bufferSize) ;
        while (r != -1)
           r = his.read(bytesBuffer) ;
        */
        HashCode hc = his.hash();
        return (hc != null) ? (hc.toString()) : (null);
    } finally {
        if (his != null)
            his.close();
    }
}

From source file:ja.centre.util.io.Files.java

public static void copy(String source, String destination) throws IOException {
    FileInputStream fis = null;/*from ww w  .j a v a 2  s .co m*/
    FileOutputStream fos = null;
    try {
        fis = new FileInputStream(source);
        fos = new FileOutputStream(destination);

        FileChannel fic = null;
        FileChannel foc = null;
        try {
            fic = fis.getChannel();
            foc = fos.getChannel();

            ByteBuffer buffer = ByteBuffer.allocate(COPY_BUFFER_SIZE);
            do {
                buffer.flip();
                foc.write(buffer);
                buffer.clear();
            } while (fic.read(buffer) != -1);
        } finally {
            closeQuietly(fic);
            closeQuietly(foc);
        }
    } finally {
        closeQuietly(fis);
        closeQuietly(fos);
    }
}

From source file:ja.lingo.engine.util.EngineFiles.java

private static void appendFile(String fileName, FileOutputStream fos, boolean prependWithLength)
        throws IOException {
    FileInputStream fis = new FileInputStream(fileName);
    FileChannel fic = fis.getChannel();
    FileChannel foc = fos.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(COPY_BUFFER_SIZE);

    // put header: length (1 int = 4 bytes)
    if (prependWithLength) {
        buffer.putInt((int) new File(fileName).length());
    }/*from w  ww .j  ava 2 s .  c om*/

    // put body
    do {
        buffer.flip();
        foc.write(buffer);
        buffer.clear();
    } while (fic.read(buffer) != -1);
    fic.close();
    // NOTE: do not close 'foc'

    Files.delete(fileName);
}

From source file:org.cytobank.io.LargeFile.java

protected static ByteBuffer getBufferFromPool() throws IOException {
    try {/*w w w  .j  av a  2 s .  c om*/
        ByteBuffer byteBuffer = (ByteBuffer) objectPool.borrowObject();
        byteBuffer.clear();
        return byteBuffer;
    } catch (Exception e) {
        throw new IOException("Could not get buffer from buffer pool.");
    }
}

From source file:MainClass.java

private static void createFile() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/primes.bin");
    FileOutputStream outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    LongBuffer longBuf = buf.asLongBuffer();
    int primesWritten = 0;
    while (primesWritten < primes.length) {
        longBuf.put(primes, primesWritten, min(longBuf.capacity(), primes.length - primesWritten));
        buf.limit(8 * longBuf.position());

        file.write(buf);//from  www .j av a 2s  . c om
        primesWritten += longBuf.position();
        longBuf.clear();
        buf.clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

From source file:gridool.communication.transport.tcp.GridNioServer.java

private static void handleRead(final SocketChannel channel, final SelectionKey key,
        final ByteBuffer sharedReadBuf, final GridTransportListener notifier, final ExecutorService exec) {
    sharedReadBuf.clear();
    final SocketAddress remoteAddr = channel.socket().getRemoteSocketAddress();
    final int bytesRead;
    try {//from www  .j a v  a 2 s  . c  om
        bytesRead = channel.read(sharedReadBuf);
    } catch (IOException e) {
        LOG.warn("Failed to read data from client: " + remoteAddr, e);
        NIOUtils.close(key);
        return;
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug("Read " + bytesRead + " bytes from a client socket: " + remoteAddr);
    }
    if (bytesRead == -1) {
        if (LOG.isTraceEnabled()) {
            LOG.trace("Remote client closed connection: " + remoteAddr);
        }
        NIOUtils.close(key);
        return;
    } else if (bytesRead == 0) {
        return;
    }

    final GridMessageBuffer msgBuf = (GridMessageBuffer) key.attachment();
    sharedReadBuf.flip();
    while (sharedReadBuf.remaining() > 0) {
        msgBuf.read(sharedReadBuf);
        if (msgBuf.isFilled()) {
            exec.execute(new Runnable() {
                public void run() {
                    final GridCommunicationMessage msg = msgBuf.toMessage();
                    msgBuf.reset();
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Recieved a GridCommunicationMessage [" + msg.getMessageId() + "]");
                    }
                    notifier.notifyListener(msg);
                }
            });
            break;
        }
    }
}

From source file:de.bluepair.sci.client.SHAUtils.java

public static <T> Map<String, String> sha512(Path path, Predicate<T> gard, T testValue, long blockSizePref,
        boolean forceBlockSize) {

    if (Files.notExists(path)) {
        return null;
    }//from   ww w.j  a  v a 2  s  .c  o m
    MessageDigest md = getDigest();
    MessageDigest md1 = getDigest();

    if (!gard.test(testValue)) {
        return null;
    }
    long blockSize = blockSizePref;
    long size = -1;
    try {
        size = Files.size(path);
        if (!forceBlockSize) {// maximal 10 hashsummen
            // sonst hab ich zu viele in der datei
            // stehen!
            while (size / blockSize > 10) {
                blockSize += blockSizePref;
            }
        }

    } catch (IOException e) {
        blockSize = blockSizePref;
        return null;
    }

    Map<String, String> map = new HashMap<>();

    long lastStart = 0;

    long stepDown = blockSize;

    try (final SeekableByteChannel fileChannel = Files.newByteChannel(path, StandardOpenOption.READ);) {

        final ByteBuffer buffer = ByteBuffer.allocateDirect(8192);
        int last;
        do {
            if (!gard.test(testValue) || Files.notExists(path)) {
                return null;
            }
            buffer.clear();
            last = fileChannel.read(buffer);

            buffer.flip();
            md.update(buffer);

            // calc 2checksups
            buffer.flip();
            md1.update(buffer);

            if (last > 0) {
                stepDown -= last;
            }

            // wenn ich ein 100mb netzwerk habe
            // ~ca. 5MB bertragung
            // also bei abbruch kann wiederaufgesetzt werden wenn die summen
            // bekannt sind.
            // ~hnlich Blcke berechen also
            // 0-5 c1
            // 0-10 c2
            // 5-10 c3 ...

            if (stepDown <= 0 || (last <= 0)) {
                long len = (blockSize + Math.abs(stepDown));
                if (stepDown > 0) {
                    // kottektur wenn last <0
                    len = blockSize - stepDown;
                }
                stepDown = blockSize;
                map.put("sha512_" + lastStart + "_" + len, Hex.encodeHexString(md1.digest()));
                lastStart += len;
                md1.reset();
            }

        } while (last > 0);

    } catch (IOException ex) {
        Logger.getLogger(FileAnalysis.class.getName()).log(Level.SEVERE, null, ex);
        return null;
    }

    final byte[] sha1hash = md.digest();
    map.put("sha512", Hex.encodeHexString(sha1hash));
    return map;

}

From source file:StreamUtil.java

/**
 * Copies the content read from InputStream to OutputStream. Uses the NIO Channels to copy.
 * @param is The InputStream that is read.
 * @param os The OutputStream where the data is written.
 * @throws IOException/*from w  w w. j ava2 s .c om*/
 */
public static void copy(final InputStream is, final OutputStream os) throws IOException {
    final ReadableByteChannel inChannel = Channels.newChannel(is);
    final WritableByteChannel outChannel = Channels.newChannel(os);

    try {
        final ByteBuffer buffer = ByteBuffer.allocate(65536);
        while (true) {
            int bytesRead = inChannel.read(buffer);
            if (bytesRead == -1)
                break;
            buffer.flip();
            while (buffer.hasRemaining())
                outChannel.write(buffer);
            buffer.clear();
        }
    } finally {
        try {
            inChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
        try {
            outChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
    }
}