Example usage for java.nio ByteBuffer get

Introduction

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

Prototype

public abstract byte get(int index);

Source Link

Document

Returns the byte at the specified index and does not change the position.

Usage

From source file:com.chicm.cmraft.rpc.PacketUtils.java

public static RpcCall parseRpcRequestFromChannel(AsynchronousSocketChannel channel, BlockingService service)
        throws InterruptedException, ExecutionException, IOException {
    RpcCall call = null;/*from www.  j a v a  2  s  .  com*/
    long t = System.currentTimeMillis();
    InputStream in = Channels.newInputStream(channel);
    byte[] datasize = new byte[MESSAGE_LENGHT_FIELD_SIZE];
    in.read(datasize);
    int nDataSize = bytes2Int(datasize);

    int len = 0;
    ByteBuffer buf = ByteBuffer.allocateDirect(nDataSize);
    for (; len < nDataSize;) {
        len += channel.read(buf).get();
    }
    if (len < nDataSize) {
        LOG.error("SOCKET READ FAILED, len:" + len);
        return call;
    }
    byte[] data = new byte[nDataSize];
    buf.flip();
    buf.get(data);
    int offset = 0;
    CodedInputStream cis = CodedInputStream.newInstance(data, offset, nDataSize - offset);
    int headerSize = cis.readRawVarint32();
    offset += cis.getTotalBytesRead();
    RequestHeader header = RequestHeader.newBuilder().mergeFrom(data, offset, headerSize).build();

    offset += headerSize;
    cis.skipRawBytes(headerSize);
    cis.resetSizeCounter();
    int bodySize = cis.readRawVarint32();
    offset += cis.getTotalBytesRead();
    //LOG.debug("header parsed:" + header.toString());

    MethodDescriptor md = service.getDescriptorForType().findMethodByName(header.getRequestName());
    Builder builder = service.getRequestPrototype(md).newBuilderForType();
    Message body = null;
    if (builder != null) {
        body = builder.mergeFrom(data, offset, bodySize).build();
        //LOG.debug("server : request parsed:" + body.toString());
    }
    call = new RpcCall(header.getId(), header, body, md);
    if (LOG.isTraceEnabled()) {
        LOG.trace("Parse Rpc request from socket: " + call.getCallId() + ", takes"
                + (System.currentTimeMillis() - t) + " ms");
    }

    return call;
}

---

From source file:com.chicm.cmraft.rpc.PacketUtils.java

public static RpcCall parseRpcResponseFromChannel(AsynchronousSocketChannel channel, BlockingService service)
        throws InterruptedException, ExecutionException, IOException {
    RpcCall call = null;/*from  www . ja va2s .co  m*/
    long t = System.currentTimeMillis();
    InputStream in = Channels.newInputStream(channel);
    byte[] datasize = new byte[MESSAGE_LENGHT_FIELD_SIZE];
    in.read(datasize);
    int nDataSize = bytes2Int(datasize);

    LOG.debug("message size: " + nDataSize);

    int len = 0;
    ByteBuffer buf = ByteBuffer.allocateDirect(nDataSize);
    for (; len < nDataSize;) {
        len += channel.read(buf).get();
    }
    if (len < nDataSize) {
        LOG.error("SOCKET READ FAILED, len:" + len);
        return call;
    }
    byte[] data = new byte[nDataSize];
    buf.flip();
    buf.get(data);
    int offset = 0;
    CodedInputStream cis = CodedInputStream.newInstance(data, offset, nDataSize - offset);
    int headerSize = cis.readRawVarint32();
    offset += cis.getTotalBytesRead();
    ResponseHeader header = ResponseHeader.newBuilder().mergeFrom(data, offset, headerSize).build();

    offset += headerSize;
    cis.skipRawBytes(headerSize);
    cis.resetSizeCounter();
    int bodySize = cis.readRawVarint32();
    offset += cis.getTotalBytesRead();

    MethodDescriptor md = service.getDescriptorForType().findMethodByName(header.getResponseName());
    Builder builder = service.getResponsePrototype(md).newBuilderForType();
    Message body = null;
    if (builder != null) {
        body = builder.mergeFrom(data, offset, bodySize).build();
    }
    call = new RpcCall(header.getId(), header, body, md);
    if (LOG.isTraceEnabled()) {
        LOG.trace("Parse Rpc response from socket: " + call.getCallId() + ", takes"
                + (System.currentTimeMillis() - t) + " ms");
    }

    return call;
}

---

From source file:com.googlecode.mp4parser.boxes.microsoft.XtraBox.java

private static String readAsciiString(ByteBuffer content, int length) {
    byte s[] = new byte[length];
    content.get(s);
    try {/*from  w ww . j ava  2  s . co  m*/
        return new String(s, "US-ASCII");
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException("Shouldn't happen", e);
    }
}

---

From source file:de.csdev.ebus.utils.EBusUtils.java

/**
 * Generates a string hex dump from a ByteBuffer
 *
 * @param data The source/*w  w  w  .java  2 s.co m*/
 * @return The StringBuilder with hex dump
 */
static public StringBuilder toHexDumpString(ByteBuffer data) {

    int size = 0;
    if (data.position() == 0) {
        size = data.limit();
    } else {
        size = data.position();
    }

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < size; i++) {
        byte c = data.get(i);
        if (i > 0) {
            sb.append(' ');
        }
        sb.append(toHexDumpString(c));
    }
    return sb;
}

---

From source file:jsave.Utils.java

/**
 * Returns an unsigned byte.//from w  ww . j a  v a2  s . c o m
 * 
 * Since java does not provide unsigned primitive types, each unsigned
 * value read from the buffer is promoted up to the next bigger primitive
 * data type : getUnsignedByte() returns a short.     
 *
 * @param bb the array of bytes in the buffer
 * @return an unsigned byte as short
 */
public static short getUnsignedByte(ByteBuffer bb) {
    return ((short) (bb.get(0) & 0xff));
}

---

From source file:com.openteach.diamond.network.waverider.network.Packet.java

/**
 * ByteBuffer??/*  w  w  w  .jav a2  s .  c  o m*/
 * @param buffer
 * @return
 */
public static Packet unmarshall(ByteBuffer buffer) {
    if (buffer.remaining() < getHeaderSize()) {
        throw new RuntimeException("Wrong packet.");
    }

    Packet packet = new Packet();
    byte[] str = new byte[NetWorkConstants.WAVERIDER_MAGIC.getBytes().length];
    buffer.get(str);
    packet.setMagic(new String(str));

    if (!NetWorkConstants.WAVERIDER_MAGIC.equals(packet.getMagic())) {
        throw new RuntimeException("Wrong packet.");
    }

    packet.setSequence(buffer.getLong());
    packet.setType(buffer.getLong());
    packet.setLength(buffer.getInt());
    packet.setPayLoad(buffer.slice());
    return packet;
}

---

From source file:net.servicestack.client.Utils.java

public static UUID fromGuidBytes(byte[] guidBytes) {
    ByteBuffer buf = ByteBuffer.wrap(guidBytes);

    byte[] first4 = new byte[4];
    buf.get(first4);
    reverse(first4);//from  w ww .j  a v  a 2s  .  c  o  m

    byte[] second2 = new byte[2];
    buf.get(second2);
    reverse(second2);

    byte[] third2 = new byte[2];
    buf.get(third2);
    reverse(third2);

    long lsb = buf.getLong();

    buf = ByteBuffer.wrap(new byte[8]).put(first4).put(second2).put(third2);

    buf.rewind();
    long msb = buf.getLong();

    return new UUID(msb, lsb);
}

---

From source file:com.unister.semweb.drums.TestUtils.java

/**
 * Reads from the given numbe of elements (<code>numberOfElementsToRead</code>) from the given file from the
 * beginning./*from w w  w . j  a  va  2  s . c om*/
 */
public static List<DummyKVStorable> readFrom(String filename, int numberOfElementsToRead) throws Exception {
    HeaderIndexFile<DummyKVStorable> file = new HeaderIndexFile<DummyKVStorable>(filename, AccessMode.READ_ONLY,
            1, TestUtils.gp);
    ByteBuffer dataBuffer = ByteBuffer.allocate(numberOfElementsToRead * TestUtils.gp.getElementSize());
    file.read(0, dataBuffer);
    dataBuffer.flip();

    List<DummyKVStorable> readData = new ArrayList<DummyKVStorable>();
    while (dataBuffer.position() < dataBuffer.limit()) {
        byte[] oneLinkData = new byte[TestUtils.gp.getElementSize()];
        dataBuffer.get(oneLinkData);
        DummyKVStorable oneDate = TestUtils.gp.getPrototype().fromByteBuffer(ByteBuffer.wrap(oneLinkData));
        readData.add(oneDate);
    }
    file.close();
    return readData;
}

---

From source file:com.google.flatbuffers.Table.java

/**
 * Check if a {@link ByteBuffer} contains a file identifier.
 *
 * @param bb A {@code ByteBuffer} to check if it contains the identifier
 * `ident`./* w w  w  . j  ava2  s .com*/
 * @param ident A `String` identifier of the FlatBuffer file.
 * @return True if the buffer contains the file identifier
 */
protected static boolean __has_identifier(ByteBuffer bb, String ident) {
    if (ident.length() != FILE_IDENTIFIER_LENGTH)
        throw new AssertionError("FlatBuffers: file identifier must be length " + FILE_IDENTIFIER_LENGTH);
    for (int i = 0; i < FILE_IDENTIFIER_LENGTH; i++) {
        if (ident.charAt(i) != (char) bb.get(bb.position() + SIZEOF_INT + i))
            return false;
    }
    return true;
}

---

From source file:com.linkedin.pinot.perf.ForwardIndexReaderBenchmark.java

public static void multiValuedReadBenchMarkV1(File file, int numDocs, int totalNumValues, int maxEntriesPerDoc,
        int columnSizeInBits) throws Exception {
    System.out.println("******************************************************************");
    System.out.println("Analyzing " + file.getName() + " numDocs:" + numDocs + ", totalNumValues:"
            + totalNumValues + ", maxEntriesPerDoc:" + maxEntriesPerDoc + ", numBits:" + columnSizeInBits);
    long start, end;
    boolean readFile = true;
    boolean randomRead = true;
    boolean contextualRead = true;
    boolean signed = false;
    boolean isMmap = false;
    PinotDataBuffer heapBuffer = PinotDataBuffer.fromFile(file, ReadMode.mmap, FileChannel.MapMode.READ_ONLY,
            "benchmarking");
    BaseSingleColumnMultiValueReader reader = new com.linkedin.pinot.core.io.reader.impl.v1.FixedBitMultiValueReader(
            heapBuffer, numDocs, totalNumValues, columnSizeInBits, signed);

    int[] intArray = new int[maxEntriesPerDoc];
    File outfile = new File("/tmp/" + file.getName() + ".raw");
    FileWriter fw = new FileWriter(outfile);
    for (int i = 0; i < numDocs; i++) {
        int length = reader.getIntArray(i, intArray);
        StringBuilder sb = new StringBuilder();
        String delim = "";
        for (int j = 0; j < length; j++) {
            sb.append(delim);/*  w  ww  . ja va2 s.c om*/
            sb.append(intArray[j]);
            delim = ",";
        }
        fw.write(sb.toString());
        fw.write("\n");
    }
    fw.close();

    // sequential read
    if (readFile) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        RandomAccessFile raf = new RandomAccessFile(file, "rw");
        ByteBuffer buffer = ByteBuffer.allocateDirect((int) file.length());
        raf.getChannel().read(buffer);
        for (int run = 0; run < MAX_RUNS; run++) {
            long length = file.length();
            start = System.currentTimeMillis();
            for (int i = 0; i < length; i++) {
                byte b = buffer.get(i);
            }
            end = System.currentTimeMillis();
            stats.addValue((end - start));
        }
        System.out.println("v1 multi value read bytes stats for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));

        raf.close();
    }
    if (randomRead) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        for (int run = 0; run < MAX_RUNS; run++) {
            start = System.currentTimeMillis();
            for (int i = 0; i < numDocs; i++) {
                int length = reader.getIntArray(i, intArray);
            }
            end = System.currentTimeMillis();
            stats.addValue((end - start));
        }
        System.out.println("v1 multi value sequential read one stats for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));
    }

    if (contextualRead) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        for (int run = 0; run < MAX_RUNS; run++) {
            MultiValueReaderContext context = (MultiValueReaderContext) reader.createContext();
            start = System.currentTimeMillis();
            for (int i = 0; i < numDocs; i++) {
                int length = reader.getIntArray(i, intArray, context);
            }
            end = System.currentTimeMillis();
            // System.out.println("RUN:" + run + "Time:" + (end-start));
            stats.addValue((end - start));
        }
        System.out.println("v1 multi value sequential read one with context stats for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));

    }
    reader.close();
    heapBuffer.close();
    System.out.println("******************************************************************");

}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• »