Example usage for java.nio ByteBuffer flip

Introduction

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

Prototype

public final Buffer flip()

Source Link

Document

Flips this buffer.

Usage

From source file:hivemall.fm.FactorizationMachineUDTF.java

private static void writeBuffer(@Nonnull ByteBuffer srcBuf, @Nonnull NioStatefullSegment dst)
        throws HiveException {
    srcBuf.flip();
    try {//from   w  w w  .j a va 2  s. c  om
        dst.write(srcBuf);
    } catch (IOException e) {
        throw new HiveException("Exception causes while writing a buffer to file", e);
    }
    srcBuf.clear();
}

From source file:io.ecarf.core.utils.Utils.java

/**
 * Get the likely uncompressed size of a Gziped file
 * @param filename//from   w  w w .  j a  v a 2s .  c o  m
 * @return
 * @throws IOException 
 * @see http://stackoverflow.com/questions/27825927/get-gzipped-file-attributes-like-gzip-l-basically-compression-ratio
 * @throws FileNotFoundException 
 */
public static long getUncompressedFileSize(String filename) throws FileNotFoundException, IOException {

    File f = new File(filename);
    try (RandomAccessFile ra = new RandomAccessFile(f, "r"); FileChannel channel = ra.getChannel()) {

        MappedByteBuffer fileBuffer = channel.map(MapMode.READ_ONLY, f.length() - 4, 4);
        fileBuffer.load();

        ByteBuffer buf = ByteBuffer.allocate(4);
        buf.order(ByteOrder.LITTLE_ENDIAN);

        buf.put(fileBuffer);
        buf.flip();
        //will print the uncompressed size
        //getInt() reads the 4 bytes as a int
        // if the file is between 2GB and 4GB
        // then this will return a negative value
        //and you'll have to do your own converting to an unsigned int
        int size = buf.getInt();

        if (size < 0) {
            return FileUtils.ONE_GB + size;
        } else {
            return size;
        }
    }
}

From source file:com.palantir.atlasdb.keyvalue.cassandra.CassandraKeyValueServices.java

static ByteBuffer makeCompositeBuffer(byte[] colName, long ts) {
    assert colName.length <= 1 << 16 : "Cannot use column names larger than 64KiB, was " + colName.length;

    ByteBuffer buffer = ByteBuffer.allocate(6 /* misc */ + 8 /* timestamp */ + colName.length)
            .order(ByteOrder.BIG_ENDIAN);

    buffer.put((byte) ((colName.length >> 8) & 0xFF));
    buffer.put((byte) (colName.length & 0xFF));
    buffer.put(colName);// www .  j a v a2  s  .c  om
    buffer.put((byte) 0);

    buffer.put((byte) 0);
    buffer.put((byte) (8 & 0xFF));
    buffer.putLong(~ts);
    buffer.put((byte) 0);

    buffer.flip();

    return buffer;
}

From source file:hivemall.mf.OnlineMatrixFactorizationUDTF.java

protected static void writeBuffer(@Nonnull final ByteBuffer srcBuf, @Nonnull final NioFixedSegment dst,
        final long lastWritePos) throws HiveException {
    // TODO asynchronous write in the background
    srcBuf.flip();
    try {/*  w ww  .j ava2 s. com*/
        dst.writeRecords(lastWritePos, srcBuf);
    } catch (IOException e) {
        throw new HiveException("Exception causes while writing records to : " + lastWritePos, e);
    }
    srcBuf.clear();
}

From source file:io.blobkeeper.file.util.FileUtils.java

public static long getCrc(@NotNull File file) {
    CRC32 crc = new CRC32();

    while (true) {
        ByteBuffer buffer = ByteBuffer.allocate(CHUNK_SIZE);
        while (buffer.hasRemaining()) {
            int bytes = 0;
            try {
                bytes = file.getFileChannel().read(buffer);
            } catch (IOException e) {
                log.error("Can't read blob file " + file, e);
                throw new IllegalArgumentException(e);
            }//from   ww w.  j  a va 2s.  co  m
            if (bytes < 0) {
                break;
            }
        }
        buffer.flip();
        if (buffer.remaining() == 0) {
            break;
        } else {
            crc.update(buffer.array());
        }
    }

    return crc.getValue();
}

From source file:org.activiti.engine.test.api.repository.diagram.ProcessDiagramRetrievalTest.java

private static boolean isEqual(InputStream stream1, InputStream stream2) throws IOException {

    ReadableByteChannel channel1 = Channels.newChannel(stream1);
    ReadableByteChannel channel2 = Channels.newChannel(stream2);

    ByteBuffer buffer1 = ByteBuffer.allocateDirect(1024);
    ByteBuffer buffer2 = ByteBuffer.allocateDirect(1024);

    try {/*  ww w .j  a v  a2s .  c  o  m*/
        while (true) {

            int bytesReadFromStream1 = channel1.read(buffer1);
            int bytesReadFromStream2 = channel2.read(buffer2);

            if (bytesReadFromStream1 == -1 || bytesReadFromStream2 == -1)
                return bytesReadFromStream1 == bytesReadFromStream2;

            buffer1.flip();
            buffer2.flip();

            for (int i = 0; i < Math.min(bytesReadFromStream1, bytesReadFromStream2); i++)
                if (buffer1.get() != buffer2.get())
                    return false;

            buffer1.compact();
            buffer2.compact();
        }

    } finally {
        if (stream1 != null)
            stream1.close();
        if (stream2 != null)
            stream2.close();
    }
}

From source file:hivemall.mf.BPRMatrixFactorizationUDTF.java

private static void writeBuffer(@Nonnull final ByteBuffer srcBuf, @Nonnull final NioFixedSegment dst,
        final long lastWritePos) throws HiveException {
    // TODO asynchronous write in the background
    srcBuf.flip();
    try {//from   w ww .  j  a  v a  2s  .c  om
        dst.writeRecords(lastWritePos, srcBuf);
    } catch (IOException e) {
        throw new HiveException("Exception causes while writing records to : " + lastWritePos, e);
    }
    srcBuf.clear();
}

From source file:com.aerohive.nms.engine.admin.task.licensemgr.license.processor2.PacketUtil.java

public static byte[] join(Header header, byte[] content) {
    ByteBuffer buf = ByteBuffer.allocate(8192);

    byte[] outBytes;
    if (content.length == 0) {
        outBytes = new byte[0];
    } else {//from   w  w w.j  a  v  a 2  s. c  om
        if (header.isSecretFlag()) {
            // encrypt data
            outBytes = encryptData(content);
        } else {
            outBytes = new byte[content.length];
            System.arraycopy(content, 0, outBytes, 0, content.length);
        }
    }
    buf.put(header.getType());
    buf.putInt(outBytes.length);
    buf.put(header.getProtocolVersion());
    buf.put(header.isSecretFlag() ? CommConst.Secret_Flag_Yes : CommConst.Secret_Flag_No);
    buf.put(outBytes);

    buf.flip();

    byte[] dst = new byte[buf.limit()];
    buf.get(dst);
    return dst;
}

From source file:hivemall.GeneralLearnerBaseUDTF.java

private static void writeBuffer(@Nonnull ByteBuffer srcBuf, @Nonnull NioStatefulSegment dst)
        throws HiveException {
    srcBuf.flip();
    try {/*from   w w w  .j  a v a2 s  .  c  o m*/
        dst.write(srcBuf);
    } catch (IOException e) {
        throw new HiveException("Exception causes while writing a buffer to file", e);
    }
    srcBuf.clear();
}

From source file:org.apache.bookkeeper.bookie.BookieJournalTest.java

private static void updateJournalVersion(JournalChannel jc, int journalVersion) throws IOException {
    long prevPos = jc.fc.position();
    try {/*from w  w  w  .j  a  v  a 2 s .  c o m*/
        ByteBuffer versionBuffer = ByteBuffer.allocate(4);
        versionBuffer.putInt(journalVersion);
        versionBuffer.flip();
        jc.fc.position(4);
        IOUtils.writeFully(jc.fc, versionBuffer);
        jc.fc.force(true);
    } finally {
        jc.fc.position(prevPos);
    }
}