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:net.vexelon.myglob.utils.Utils.java

/**
 * Reads an input stream into a byte array
 * @param source//from  w  w w  .  ja v a 2  s.c  o  m
 * @return Byte array of input stream data
 * @throws IOException
 */
public static byte[] read(InputStream source) throws IOException {
    ReadableByteChannel srcChannel = Channels.newChannel(source);
    ByteArrayOutputStream baos = new ByteArrayOutputStream(
            source.available() > 0 ? source.available() : BUFFER_PAGE_SIZE);
    WritableByteChannel destination = Channels.newChannel(baos);

    try {
        ByteBuffer buffer = ByteBuffer.allocate(BUFFER_PAGE_SIZE);
        while (srcChannel.read(buffer) > 0) {
            buffer.flip();
            while (buffer.hasRemaining()) {
                destination.write(buffer);
            }
            buffer.clear();
        }
        return baos.toByteArray();
    } catch (IOException e) {
        throw e;
    } finally {
        try {
            if (srcChannel != null)
                srcChannel.close();
        } catch (IOException e) {
        }
        try {
            if (source != null)
                source.close();
        } catch (IOException e) {
        }
        try {
            if (destination != null)
                destination.close();
        } catch (IOException e) {
        }
    }
}

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From source file:com.serotonin.bacnet4j.util.sero.StreamUtils.java

public static void transfer(InputStream in, SocketChannel out) throws IOException {
    byte[] buf = new byte[1024];
    ByteBuffer bbuf = ByteBuffer.allocate(1024);
    int len;/*from ww w  . j a  v  a  2 s .c om*/
    while ((len = in.read(buf)) != -1) {
        bbuf.put(buf, 0, len);
        bbuf.flip();
        while (bbuf.remaining() > 0)
            out.write(bbuf);
        bbuf.clear();
    }
}

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From source file:com.openteach.diamond.network.waverider.session.DefaultSession.java

public static Command makeGreetCommand() {
    String HELLO = "Hello Master";
    ByteBuffer buffer = ByteBuffer.allocate(HELLO.getBytes().length);
    buffer.put(HELLO.getBytes());//from   ww w .j a va2s  .c o m
    buffer.flip();
    Command command = new Command(1L, buffer);
    return command;
}

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From source file:com.mgmtp.perfload.perfalyzer.util.IoUtilities.java

/**
 * Copies the content from one channel to another.
 *
 * @param srcChannel//from  w w w . j a v  a2  s.c o  m
 *       the source channel to copy from
 * @param destChannel
 *       the destination channel to copy to
 */
public static void copy(final ReadableByteChannel srcChannel, final WritableByteChannel destChannel)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(BUFFER_SIZE);
    while (srcChannel.read(buffer) != -1) {
        // flip the buffer so it can be written to the destination channel
        buffer.flip();

        // write to the destination channel
        destChannel.write(buffer);

        // If partial transfer, shift remainder down so it does not get lost
        // If buffer is empty, this is the same as calling clear()
        buffer.compact();
    }

    // EOF will leave buffer in fill state
    buffer.flip();

    // make sure the buffer is fully drained
    while (buffer.hasRemaining()) {
        destChannel.write(buffer);
    }
}

---

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

public static boolean isFileEmpty(@NotNull File file, @NotNull IndexElt elt) {
    ByteBuffer fourBytes = ByteBuffer.allocate(4);
    try {/*w  w w. j  a v  a  2 s . com*/
        file.getFileChannel().read(fourBytes, elt.getOffset());
    } catch (IOException e) {
        log.error("Can't read blob file", e);
        throw new IllegalArgumentException(e);
    }

    fourBytes.flip();
    for (byte b : fourBytes.array()) {
        if (b != 0) {
            return false;
        }
    }

    return true;
}

---

From source file:com.offbynull.portmapper.pcp.PcpDiscovery.java

private static Map<InetAddress, InetAddress> discoverLocalAddressesToGateways(Set<InetAddress> gateways)
        throws IOException, InterruptedException {
    Set<InetAddress> localAddresses = NetworkUtils.getAllLocalIpv4Addresses();
    List<DatagramChannel> channels = new ArrayList<>();
    final Map<DatagramChannel, InetAddress> bindMap = Collections
            .synchronizedMap(new HashMap<DatagramChannel, InetAddress>());
    final Map<InetAddress, InetAddress> localAddrToGatewayAddrMap = Collections
            .synchronizedMap(new HashMap<InetAddress, InetAddress>());

    try {// w ww.j a  v a  2 s.  co m
        for (InetAddress localAddress : localAddresses) {
            DatagramChannel unicastChannel = null;
            try {
                unicastChannel = DatagramChannel.open();
                unicastChannel.configureBlocking(false);
                unicastChannel.socket().bind(new InetSocketAddress(localAddress, 0));
            } catch (IOException ioe) {
                IOUtils.closeQuietly(unicastChannel);
                throw ioe;
            }

            channels.add(unicastChannel);
            bindMap.put(unicastChannel, localAddress);
        }
    } catch (IOException ioe) {
        for (DatagramChannel channel : channels) {
            IOUtils.closeQuietly(channel);
        }
        throw ioe;
    }

    UdpCommunicator communicator = null;
    try {
        communicator = new UdpCommunicator(channels);
        communicator.startAsync().awaitRunning();
        communicator.addListener(new UdpCommunicatorListener() {

            @Override
            public void incomingPacket(InetSocketAddress sourceAddress, DatagramChannel channel,
                    ByteBuffer packet) {
                // make sure version is 2 and error isn't ADDRESS_MISMATCH and we're good to go
                if (packet.remaining() < 4
                        || packet.get(0) == 2 && packet.get(4) == PcpResultCode.ADDRESS_MISMATCH.ordinal()) {
                    return;
                }

                InetAddress localAddress = bindMap.get(channel);
                if (localAddress == null) {
                    return;
                }
                localAddrToGatewayAddrMap.put(localAddress, sourceAddress.getAddress());
            }
        });

        for (DatagramChannel channel : bindMap.keySet()) {
            for (InetAddress gateway : gateways) {
                ByteBuffer outBuf = ByteBuffer.allocate(1100);
                MapPcpRequest mpr = new MapPcpRequest(ByteBuffer.allocate(12), 0, 0, 0,
                        InetAddress.getByName("::"), 0L);
                mpr.dump(outBuf, bindMap.get(channel));
                outBuf.flip();

                communicator.send(channel, new InetSocketAddress(gateway, 5351), outBuf.asReadOnlyBuffer());
            }
        }

        Thread.sleep(5000L);
    } finally {
        if (communicator != null) {
            communicator.stopAsync().awaitTerminated();
        }
    }

    return new HashMap<>(localAddrToGatewayAddrMap);
}

---

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

/**
 * This function checks, if the file with the given filename contains exactly the given LinkData-objects.
 * /*from   w ww . ja  va2 s .  c o m*/
 * @param dbFileName
 *            the name of the file
 * @param linkDataList
 *            the array, containing LinkData
 * @throws IOException
 * @throws FileLockException
 */
public static boolean checkContentFile(String dbFileName, DummyKVStorable[] linkDataList)
        throws IOException, FileLockException {
    // load file
    DummyKVStorable prototype = gp.getPrototype();
    HeaderIndexFile<DummyKVStorable> dbfile = new HeaderIndexFile<DummyKVStorable>(dbFileName, 1, TestUtils.gp);
    ByteBuffer buffer = ByteBuffer.allocate(prototype.getSize());
    long offset = 0;
    int k = 0;
    while (offset < dbfile.getFilledUpFromContentStart()) {
        dbfile.read(offset, buffer);
        buffer.flip();
        DummyKVStorable newLinkData = (DummyKVStorable) prototype.fromByteBuffer(buffer);
        if (!newLinkData.equals(linkDataList[k])) {
            return false;
        }
        k++;
        offset += buffer.limit();
        buffer.clear();
    }
    dbfile.close();
    return true;
}

---

From source file:gridool.memcached.gateway.BinaryCommandProxy.java

private static void xferResponse(final byte opcode, final SocketChannel src, final Channel dst,
        final String key) throws IOException {
    ByteBuffer headerBuf = ByteBuffer.allocate(BinaryProtocol.HEADER_LENGTH);
    int headerRead = NIOUtils.readFully(src, headerBuf, BinaryProtocol.HEADER_LENGTH);
    assert (headerRead == BinaryProtocol.HEADER_LENGTH) : headerRead;
    headerBuf.flip();

    if (BinaryProtocol.surpressSuccessResponse(opcode)) {
        // piggyback will never happens 
        final short status = headerBuf.getShort(6);
        if (status == 0) {
            return;
        }/* w w w  .  j  av  a2  s. c om*/
    }

    ChannelBuffer res;
    int totalBody = headerBuf.getInt(8);
    if (totalBody > 0) {
        ByteBuffer bodyBuf = ByteBuffer.allocate(totalBody);
        int bodyRead = NIOUtils.readFully(src, bodyBuf, totalBody);
        assert (bodyRead == totalBody) : "bodyRead (" + bodyRead + ") != totalBody (" + totalBody + ")";
        bodyBuf.flip();
        res = ChannelBuffers.wrappedBuffer(headerBuf, bodyBuf);
    } else {
        res = ChannelBuffers.wrappedBuffer(headerBuf);
    }
    String opname = BinaryProtocol.resolveName(headerBuf.get(1));
    if (LOG.isDebugEnabled()) {
        Header header = new Header();
        header.decode(headerBuf);
        LOG.debug(
                "Start sending memcached response [" + opname + "] " + res.readableBytes() + " bytes for key '"
                        + key + "'\n" + header + '\n' + Arrays.toString(res.toByteBuffer().array()));
    }
    dst.write(res).addListener(new VerboseListener("sendResponse [" + opname + "] for key: " + key));
}

---

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 w ww . jav 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:com.meltmedia.cadmium.core.FileSystemManager.java

public static void streamCopy(InputStream streamIn, OutputStream streamOut, boolean leaveOutputOpen)
        throws IOException {
    ReadableByteChannel input = Channels.newChannel(streamIn);
    WritableByteChannel output = Channels.newChannel(streamOut);

    ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);

    while (input.read(buffer) != -1) {
        buffer.flip();

        output.write(buffer);//from  w  w w.j av  a 2 s .  c o m

        buffer.compact();
    }

    buffer.flip();

    // Make sure the buffer is empty
    while (buffer.hasRemaining()) {
        output.write(buffer);
    }

    input.close();
    if (!leaveOutputOpen) {
        output.close();
    }
}

---

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