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.koda.integ.hbase.blockcache.OffHeapBlockCacheOld.java

/**
 * Store external with codec./*from ww w. jav a2 s  .  c o m*/
 * Format:
 * 0..3  - total record size (-4)
 * 4..7  - size of a key in bytes (16 if use hash128)
 * 8 .. x - key data
 * x+1 ..x+1- IN_MEMORY flag ( 1- in memory, 0 - not)
 * x+2 ... block, serialized and compressed 
 *
 * @param blockName the block name
 * @param buf the buf
 * @param inMemory the in memory
 * @throws IOException Signals that an I/O exception has occurred.
 */
private void storeExternalWithCodec(String blockName, Cacheable buf, boolean inMemory) throws IOException {
    // If external storage is disable - bail out
    if (overflowExtEnabled == false) {
        return;
    }
    byte[] hashed = Utils.hash128(blockName);
    // Check if we have already this block in external storage cache
    if (extStorageCache.contains(hashed)) {
        return;
    }

    ByteBuffer buffer = extStorageCache.getLocalBufferWithAddress().getBuffer();
    deserializer.set(buf.getDeserializer());

    SerDe serde = extStorageCache.getSerDe();
    Codec codec = extStorageCache.getCompressionCodec();
    buffer.clear();

    buffer.position(4);

    // Save key
    buffer.putInt(hashed.length);
    buffer.put(hashed);
    buffer.put(inMemory ? (byte) 1 : (byte) 0);

    if (buf != null) {
        serde.writeCompressed(buffer, buf, codec);
        int pos = buffer.position();
        buffer.putInt(0, pos - 4);
    } else {
        buffer.putInt(0, 0);
    }

    StorageHandle handle = storage.storeData(buffer);

    try {
        // WE USE byte array as a key
        extStorageCache.put(hashed, handle);
    } catch (Exception e) {
        throw new IOException(e);
    }

}

From source file:com.koda.integ.hbase.blockcache.OffHeapBlockCacheOld.java

/**
 * Read external with codec.//  w  w w. ja  va 2  s  . co m
 *
 * @param blockName the block name
 * @return the cacheable
 * @throws IOException Signals that an I/O exception has occurred.
 */
private Cacheable readExternalWithCodec(String blockName) throws IOException {
    if (overflowExtEnabled == false)
        return null;
    // Check if we have  already this block in external storage cache
    try {
        // We use 16 - byte hash for external storage cache  
        byte[] hashed = Utils.hash128(blockName);
        StorageHandle handle = (StorageHandle) extStorageCache.get(hashed);
        if (handle == null)
            return null;
        ByteBuffer buffer = extStorageCache.getLocalBufferWithAddress().getBuffer();
        SerDe serde = extStorageCache.getSerDe();
        @SuppressWarnings("unused")
        Codec codec = extStorageCache.getCompressionCodec();

        buffer.clear();

        StorageHandle newHandle = storage.getData(handle, buffer);
        if (buffer.position() > 0)
            buffer.flip();
        int size = buffer.getInt();
        if (size == 0)
            return null;
        // Skip key
        int keySize = buffer.getInt();
        buffer.position(8 + keySize);
        boolean inMemory = buffer.get() == (byte) 1;

        //buffer.position(5);
        buffer.limit(size + 4);
        Cacheable obj = (Cacheable) serde.readCompressed(buffer/*, codec*/);
        if (inMemory) {
            permGenCache.put(blockName, obj);
        } else {
            tenGenCache.put(blockName, obj);
        }
        if (newHandle.equals(handle) == false) {
            extStorageCache.put(hashed, newHandle);
        }

        return obj;

    } catch (NativeMemoryException e) {
        throw new IOException(e);
    }

}

From source file:com.ning.http.client.providers.apache.ApacheAsyncHttpProvider.java

private HttpMethodBase createMethod(HttpClient client, Request request)
        throws IOException, FileNotFoundException {
    String methodName = request.getMethod();
    HttpMethodBase method = null;//  w  w w. j  a  v a  2  s  .  co  m
    if (methodName.equalsIgnoreCase("POST") || methodName.equalsIgnoreCase("PUT")) {
        EntityEnclosingMethod post = methodName.equalsIgnoreCase("POST") ? new PostMethod(request.getUrl())
                : new PutMethod(request.getUrl());

        String bodyCharset = request.getBodyEncoding() == null ? DEFAULT_CHARSET : request.getBodyEncoding();

        post.getParams().setContentCharset("ISO-8859-1");
        if (request.getByteData() != null) {
            post.setRequestEntity(new ByteArrayRequestEntity(request.getByteData()));
            post.setRequestHeader("Content-Length", String.valueOf(request.getByteData().length));
        } else if (request.getStringData() != null) {
            post.setRequestEntity(new StringRequestEntity(request.getStringData(), "text/xml", bodyCharset));
            post.setRequestHeader("Content-Length",
                    String.valueOf(request.getStringData().getBytes(bodyCharset).length));
        } else if (request.getStreamData() != null) {
            InputStreamRequestEntity r = new InputStreamRequestEntity(request.getStreamData());
            post.setRequestEntity(r);
            post.setRequestHeader("Content-Length", String.valueOf(r.getContentLength()));

        } else if (request.getParams() != null) {
            StringBuilder sb = new StringBuilder();
            for (final Map.Entry<String, List<String>> paramEntry : request.getParams()) {
                final String key = paramEntry.getKey();
                for (final String value : paramEntry.getValue()) {
                    if (sb.length() > 0) {
                        sb.append("&");
                    }
                    UTF8UrlEncoder.appendEncoded(sb, key);
                    sb.append("=");
                    UTF8UrlEncoder.appendEncoded(sb, value);
                }
            }

            post.setRequestHeader("Content-Length", String.valueOf(sb.length()));
            post.setRequestEntity(new StringRequestEntity(sb.toString(), "text/xml", "ISO-8859-1"));

            if (!request.getHeaders().containsKey("Content-Type")) {
                post.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            }
        } else if (request.getParts() != null) {
            MultipartRequestEntity mre = createMultipartRequestEntity(bodyCharset, request.getParts(),
                    post.getParams());
            post.setRequestEntity(mre);
            post.setRequestHeader("Content-Type", mre.getContentType());
            post.setRequestHeader("Content-Length", String.valueOf(mre.getContentLength()));
        } else if (request.getEntityWriter() != null) {
            post.setRequestEntity(new EntityWriterRequestEntity(request.getEntityWriter(),
                    computeAndSetContentLength(request, post)));
        } else if (request.getFile() != null) {
            File file = request.getFile();
            if (!file.isFile()) {
                throw new IOException(
                        String.format(Thread.currentThread() + "File %s is not a file or doesn't exist",
                                file.getAbsolutePath()));
            }
            post.setRequestHeader("Content-Length", String.valueOf(file.length()));

            FileInputStream fis = new FileInputStream(file);
            try {
                InputStreamRequestEntity r = new InputStreamRequestEntity(fis);
                post.setRequestEntity(r);
                post.setRequestHeader("Content-Length", String.valueOf(r.getContentLength()));
            } finally {
                fis.close();
            }
        } else if (request.getBodyGenerator() != null) {
            Body body = request.getBodyGenerator().createBody();
            try {
                int length = (int) body.getContentLength();
                if (length < 0) {
                    length = (int) request.getContentLength();
                }

                // TODO: This is suboptimal
                if (length >= 0) {
                    post.setRequestHeader("Content-Length", String.valueOf(length));

                    // This is totally sub optimal
                    byte[] bytes = new byte[length];
                    ByteBuffer buffer = ByteBuffer.wrap(bytes);
                    for (;;) {
                        buffer.clear();
                        if (body.read(buffer) < 0) {
                            break;
                        }
                    }
                    post.setRequestEntity(new ByteArrayRequestEntity(bytes));
                }
            } finally {
                try {
                    body.close();
                } catch (IOException e) {
                    logger.warn("Failed to close request body: {}", e.getMessage(), e);
                }
            }
        }

        if (request.getHeaders().getFirstValue("Expect") != null
                && request.getHeaders().getFirstValue("Expect").equalsIgnoreCase("100-Continue")) {
            post.setUseExpectHeader(true);
        }
        method = post;
    } else if (methodName.equalsIgnoreCase("DELETE")) {
        method = new DeleteMethod(request.getUrl());
    } else if (methodName.equalsIgnoreCase("HEAD")) {
        method = new HeadMethod(request.getUrl());
    } else if (methodName.equalsIgnoreCase("GET")) {
        method = new GetMethod(request.getUrl());
    } else if (methodName.equalsIgnoreCase("OPTIONS")) {
        method = new OptionsMethod(request.getUrl());
    } else {
        throw new IllegalStateException(String.format("Invalid Method", methodName));
    }

    ProxyServer proxyServer = request.getProxyServer() != null ? request.getProxyServer()
            : config.getProxyServer();
    boolean avoidProxy = ProxyUtils.avoidProxy(proxyServer, request);
    if (!avoidProxy) {

        if (proxyServer.getPrincipal() != null) {
            Credentials defaultcreds = new UsernamePasswordCredentials(proxyServer.getPrincipal(),
                    proxyServer.getPassword());
            client.getState().setCredentials(new AuthScope(null, -1, AuthScope.ANY_REALM), defaultcreds);
        }

        ProxyHost proxyHost = proxyServer == null ? null
                : new ProxyHost(proxyServer.getHost(), proxyServer.getPort());
        client.getHostConfiguration().setProxyHost(proxyHost);
    }

    method.setFollowRedirects(false);
    if ((request.getCookies() != null) && !request.getCookies().isEmpty()) {
        for (Cookie cookie : request.getCookies()) {
            method.setRequestHeader("Cookie", AsyncHttpProviderUtils.encodeCookies(request.getCookies()));
        }
    }

    if (request.getHeaders() != null) {
        for (String name : request.getHeaders().keySet()) {
            if (!"host".equalsIgnoreCase(name)) {
                for (String value : request.getHeaders().get(name)) {
                    method.setRequestHeader(name, value);
                }
            }
        }
    }

    if (request.getHeaders().getFirstValue("User-Agent") != null) {
        method.setRequestHeader("User-Agent", request.getHeaders().getFirstValue("User-Agent"));
    } else if (config.getUserAgent() != null) {
        method.setRequestHeader("User-Agent", config.getUserAgent());
    } else {
        method.setRequestHeader("User-Agent",
                AsyncHttpProviderUtils.constructUserAgent(ApacheAsyncHttpProvider.class));
    }

    if (config.isCompressionEnabled()) {
        Header acceptableEncodingHeader = method.getRequestHeader("Accept-Encoding");
        if (acceptableEncodingHeader != null) {
            String acceptableEncodings = acceptableEncodingHeader.getValue();
            if (acceptableEncodings.indexOf("gzip") == -1) {
                StringBuilder buf = new StringBuilder(acceptableEncodings);
                if (buf.length() > 1) {
                    buf.append(",");
                }
                buf.append("gzip");
                method.setRequestHeader("Accept-Encoding", buf.toString());
            }
        } else {
            method.setRequestHeader("Accept-Encoding", "gzip");
        }
    }

    if (request.getVirtualHost() != null) {

        String vs = request.getVirtualHost();
        int index = vs.indexOf(":");
        if (index > 0) {
            vs = vs.substring(0, index);
        }
        method.getParams().setVirtualHost(vs);
    }

    return method;
}

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

/**
 * ??Packet, ??/*from w  ww  .  ja v a 2  s. c  om*/
 * @param inputBuffer
 * @return
 * @throws IOException, InterruptedException
 */
public static Packet parse(BlockingQueue<ByteBuffer> inputBuffer, NetWorkEndPoint endPoint,
        SocketChannel channel) throws IOException, InterruptedException {
    // Buffer for packet header
    byte[] tmpBuf = new byte[NetWorkConstants.DEFAULT_NETWORK_BUFFER_SIZE];
    ByteBuffer header = ByteBuffer.allocate(Packet.getHeaderSize());
    ByteBuffer currentBuffer = null;
    int rest = 0;
    boolean isRemove = false;

    // ?
    while (true) {
        while ((currentBuffer = inputBuffer.peek()) == null) {
            if (!endPoint.notifyRead(channel)) {
                throw new IOException("Socket closed by other thread");
            }
            // ?
            //endPoint.waitMoreData(5);
            // FIXME 2ms
            //Thread.sleep(1);
            Thread.yield();
        }
        isRemove = false;
        rest = header.capacity() - header.position();
        if (currentBuffer.remaining() >= rest) {
            if (currentBuffer.remaining() == rest) {
                isRemove = true;
            }
            currentBuffer.get(tmpBuf, 0, rest);
            header.put(tmpBuf, 0, rest);
            if (isRemove) {
                inputBuffer.remove();
            }
            break;
        } else {
            header.put(currentBuffer);
            inputBuffer.remove();
        }
    }

    header.flip();

    // , ???

    // ?
    Integer size = header.getInt(Packet.getLengthPosition());
    // For test
    /*if(size < 0 || size > 100000) {
       logger.info("Error");
    }*/
    //logger.debug(new StringBuilder("Try to allocate ").append(size).append(" bytes memory"));
    ByteBuffer buffer = ByteBuffer.allocate(size);
    buffer.put(header);
    header.clear();

    // ?
    while (true) {
        while ((currentBuffer = inputBuffer.peek()) == null) {
            endPoint.notifyRead(channel);
            Thread.sleep(1000);
        }
        isRemove = false;
        rest = buffer.capacity() - buffer.position();
        if (currentBuffer.remaining() >= rest) {
            if (currentBuffer.remaining() == rest) {
                isRemove = true;
            }
            currentBuffer.get(tmpBuf, 0, rest);
            buffer.put(tmpBuf, 0, rest);
            if (isRemove) {
                inputBuffer.remove();
            }
            break;
        } else {
            buffer.put(currentBuffer);
            inputBuffer.remove();
        }
    }
    //buffer.position(0);
    buffer.flip();
    Packet packet = Packet.unmarshall(buffer);
    //logger.info("Parse one packet from network");
    //packet.dump();
    return packet;
}

From source file:co.elastic.tealess.SSLChecker.java

private void checkHandshake(SSLReport sslReport, SocketChannel socket) {
    final InetSocketAddress address = sslReport.getAddress();
    final String name = sslReport.getHostname();
    IOObserver ioObserver = new IOObserver();
    ObservingSSLEngine sslEngine = new ObservingSSLEngine(ctx.createSSLEngine(name, address.getPort()),
            ioObserver);/*  www .j  a  v a  2 s . co m*/
    sslReport.setIOObserver(ioObserver);
    sslEngine.setUseClientMode(true);

    try {
        sslEngine.beginHandshake();
    } catch (SSLException e) {
        sslReport.setFailed(e);
        Throwable cause = Blame.get(e);
        logger.warn("beginHandshake failed: [{}] {}", cause.getClass(), cause.getMessage());
    }

    // TODO: Is this enough bytes?
    int size = sslEngine.getSession().getApplicationBufferSize() * 2;
    ByteBuffer localText = ByteBuffer.allocate(size);
    ByteBuffer localWire = ByteBuffer.allocate(size);
    ByteBuffer peerText = ByteBuffer.allocate(size);
    ByteBuffer peerWire = ByteBuffer.allocate(size);

    // TODO: I wonder... do we need to send any data at all?
    localText.put("SSL TEST. HELLO.".getBytes());
    localText.flip();

    SSLEngineResult result;
    logger.info("Starting SSL handshake [{}] ", address);
    try {
        SSLEngineResult.HandshakeStatus state;
        state = sslEngine.getHandshakeStatus();
        while (state != FINISHED) {
            // XXX: Use a Selector to wait for data.
            //logger.trace("State: {} [{}]", state, address);
            switch (state) {
            case NEED_TASK:
                sslEngine.getDelegatedTask().run();
                state = sslEngine.getHandshakeStatus();
                break;
            case NEED_WRAP:
                localWire.clear();
                result = sslEngine.wrap(localText, localWire);
                state = result.getHandshakeStatus();
                localWire.flip();
                while (localWire.hasRemaining()) {
                    socket.write(localWire);
                    //logger.trace("Sent {} bytes [{}]", bytes, address);
                }
                localWire.compact();
                break;
            case NEED_UNWRAP:
                // Try reading until we get data.
                Selector selector = Selector.open();
                while (peerWire.position() == 0) {
                    socket.read(peerWire);
                    try {
                        Thread.currentThread().sleep(5);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println("Read " + peerWire.position() + " bytes");
                peerWire.flip();
                result = sslEngine.unwrap(peerWire, peerText);
                state = result.getHandshakeStatus();
                peerWire.compact();
                break;
            }
        }
    } catch (IOException e) {
        sslReport.setFailed(e);
        sslReport.setSSLSession(sslEngine.getHandshakeSession());
        sslReport.setPeerCertificateDetails(peerCertificateDetails);
        logger.warn("beginHandshake failed", e);
        return;
    }

    logger.info("handshake completed [{}]", address);

    // Handshake OK!
    sslReport.setSSLSession(sslEngine.getSession());
}

From source file:libepg.epg.section.sectionreconstructor.SectionReconstructor.java

/**
 * ??????? ??????????????????//w w  w.  jav a2 s . c  om
 *
 * @return ???
 *
 */
public synchronized Set<byte[]> getSectionByteArrays() {

    Set<byte[]> ret = new TreeSet<>((byte[] left, byte[] right) -> {
        for (int i = 0, j = 0; i < left.length && j < right.length; i++, j++) {
            int a = (left[i] & 0xff);
            int b = (right[j] & 0xff);
            if (a != b) {
                return a - b;
            }
        }
        return left.length - right.length;
    });

    boolean first_start_indicator_found = false;

    ByteBuffer buf = null;

    PayLoadSplitter splitter = new PayLoadSplitter();

    for (TsPacketParcel parcel : parcels) {

        splitter.setPacket(parcel.getPacket());
        Map<PayLoadSplitter.PAYLOAD_PART_KEY, byte[]> t_map = splitter.getSplittedPayLoad();

        if ((buf == null)
                || (parcel.isMissingJustBefore() == TsPacketParcel.MISSING_PACKET_FLAG.MISSING_JUST_BEFORE)) {
            if (LOG.isTraceEnabled()) {
                LOG.trace(
                        "?????????????????????????");
            }
            if (buf == null) {
                buf = ByteBuffer.allocate(TABLE_ID.MAX_SECTION_LENGTH.BYTE_4093.getMaxSectionLength());
            } else {
                buf.clear();
            }
        }
        if (LOG.isTraceEnabled()) {
            LOG.trace("?=" + Hex.encodeHexString(buf.array()));
        }
        if ((first_start_indicator_found == false) && (parcel.getPacket()
                .getPayload_unit_start_indicator() == TsPacket.PAYLOAD_UNIT_START_INDICATOR.START_PES_OR_START_SECTION)) {
            if (LOG.isTraceEnabled()) {
                LOG.trace("??");
            }
            first_start_indicator_found = true;
        }

        if (first_start_indicator_found == false) {
            if (LOG.isTraceEnabled()) {
                LOG.trace(
                        "?????????");
            }
        } else if (parcel.getPacket()
                .getPayload_unit_start_indicator() == TsPacket.PAYLOAD_UNIT_START_INDICATOR.START_PES_OR_START_SECTION) {
            if (LOG.isTraceEnabled()) {
                LOG.trace(
                        "??????????");
            }
            if (buf.position() == 0) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace(
                            "??0=?????????->??2?????????????+1?????");
                }
                byte[] temp_array = null;
                if (t_map.size() == 1) {
                    temp_array = t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.PAYLOAD_AFTER_2_BYTE);
                } else {
                    temp_array = t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.NEXT_POINTER);
                }
                buf.put(temp_array);
            } else {
                if (LOG.isTraceEnabled()) {
                    LOG.trace(
                            "??0????=???????->??2???????????\n???????????????+1?????");
                }
                byte[] temp_array = null;
                if (t_map.containsKey(PayLoadSplitter.PAYLOAD_PART_KEY.PAYLOAD_AFTER_2_BYTE)) {
                    if (LOG.isTraceEnabled()) {
                        LOG.trace(
                                "???????????????");
                    }

                    this.addToReturnObject(buf, ret);

                    buf.clear();

                    temp_array = t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.PAYLOAD_AFTER_2_BYTE);
                    buf.put(temp_array);
                } else {
                    if (LOG.isTraceEnabled()) {
                        LOG.trace(
                                "??????????????????");
                    }
                    temp_array = t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.PREV_POINTER);
                    buf.put(temp_array);

                    this.addToReturnObject(buf, ret);

                    buf.clear();

                    temp_array = t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.NEXT_POINTER);
                    buf.put(temp_array);
                }
            }
        } else {
            if (LOG.isTraceEnabled()) {
                LOG.trace(
                        "?????->????->??????");
            }
            buf.put(t_map.get(PayLoadSplitter.PAYLOAD_PART_KEY.ALL_PAYLOAD));
        }
    }

    return Collections.unmodifiableSet(ret);
}

From source file:io.druid.hll.HyperLogLogCollectorTest.java

private ByteBuffer makeCollectorBuffer(int offset, byte[] initialBytes, int remainingBytes) {
    short numNonZero = 0;
    for (byte initialByte : initialBytes) {
        numNonZero += computeNumNonZero(initialByte);
    }//from  www  . ja va 2 s.c o m

    final short numNonZeroInRemaining = computeNumNonZero((byte) remainingBytes);
    numNonZero += (short) ((HyperLogLogCollector.NUM_BYTES_FOR_BUCKETS - initialBytes.length)
            * numNonZeroInRemaining);

    ByteBuffer biggerOffset = ByteBuffer.allocate(HyperLogLogCollector.getLatestNumBytesForDenseStorage());
    biggerOffset.put(HLLCV1.VERSION);
    biggerOffset.put((byte) offset);
    biggerOffset.putShort(numNonZero);
    biggerOffset.put((byte) 0);
    biggerOffset.putShort((short) 0);
    biggerOffset.put(initialBytes);
    while (biggerOffset.hasRemaining()) {
        biggerOffset.put((byte) remainingBytes);
    }
    biggerOffset.clear();
    return biggerOffset.asReadOnlyBuffer();
}

From source file:com.liferay.portal.util.FileImpl.java

public boolean isSameContent(File file, byte[] bytes, int length) {
    FileChannel fileChannel = null;

    try {//from   w  w w .ja  v a  2  s . c om
        FileInputStream fileInputStream = new FileInputStream(file);

        fileChannel = fileInputStream.getChannel();

        if (fileChannel.size() != length) {
            return false;
        }

        byte[] buffer = new byte[1024];

        ByteBuffer byteBuffer = ByteBuffer.wrap(buffer);

        int bufferIndex = 0;
        int bufferLength = -1;

        while (((bufferLength = fileChannel.read(byteBuffer)) > 0) && (bufferIndex < length)) {

            for (int i = 0; i < bufferLength; i++) {
                if (buffer[i] != bytes[bufferIndex++]) {
                    return false;
                }
            }

            byteBuffer.clear();
        }

        if ((bufferIndex != length) || (bufferLength != -1)) {
            return false;
        } else {
            return true;
        }
    } catch (Exception e) {
        return false;
    } finally {
        if (fileChannel != null) {
            try {
                fileChannel.close();
            } catch (IOException ioe) {
            }
        }
    }
}

From source file:org.red5.stream.http.servlet.TransportSegmentFeeder.java

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
 *      response)//from w w  w. j a v  a  2 s.c  o  m
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    log.debug("Segment feed requested");
    // get red5 context and segmenter
    if (service == null) {
        ApplicationContext appCtx = (ApplicationContext) getServletContext()
                .getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
        service = (SegmenterService) appCtx.getBean("segmenter.service");
    }
    // get the requested stream / segment
    String servletPath = request.getServletPath();
    String streamName = servletPath.split("\\.")[0];
    log.debug("Stream name: {}", streamName);
    if (service.isAvailable(streamName)) {
        response.setContentType("video/MP2T");
        // data segment
        Segment segment = null;
        // setup buffers and output stream
        byte[] buf = new byte[188];
        ByteBuffer buffer = ByteBuffer.allocate(188);
        ServletOutputStream sos = response.getOutputStream();
        // loop segments
        while ((segment = service.getSegment(streamName)) != null) {
            do {
                buffer = segment.read(buffer);
                // log.trace("Limit - position: {}", (buffer.limit() - buffer.position()));
                if ((buffer.limit() - buffer.position()) == 188) {
                    buffer.get(buf);
                    // write down the output stream
                    sos.write(buf);
                } else {
                    log.info("Segment result has indicated a problem");
                    // verifies the currently requested stream segment
                    // number against the currently active segment
                    if (service.getSegment(streamName) == null) {
                        log.debug("Requested segment is no longer available");
                        break;
                    }
                }
                buffer.clear();
            } while (segment.hasMoreData());
            log.trace("Segment {} had no more data", segment.getIndex());
            // flush
            sos.flush();
            // segment had no more data
            segment.cleanupThreadLocal();
        }
        buffer.clear();
        buffer = null;
    } else {
        // let requester know that stream segment is not available
        response.sendError(404, "Requested segmented stream not found");
    }
}

From source file:org.apache.druid.hll.HyperLogLogCollectorTest.java

private ByteBuffer makeCollectorBuffer(int offset, byte[] initialBytes, int remainingBytes) {
    short numNonZero = 0;
    for (byte initialByte : initialBytes) {
        numNonZero += computeNumNonZero(initialByte);
    }//from   w  w  w .  j av  a 2 s.c om

    final short numNonZeroInRemaining = computeNumNonZero((byte) remainingBytes);
    numNonZero += (short) ((HyperLogLogCollector.NUM_BYTES_FOR_BUCKETS - initialBytes.length)
            * numNonZeroInRemaining);

    ByteBuffer biggerOffset = ByteBuffer.allocate(HyperLogLogCollector.getLatestNumBytesForDenseStorage());
    biggerOffset.put(VersionOneHyperLogLogCollector.VERSION);
    biggerOffset.put((byte) offset);
    biggerOffset.putShort(numNonZero);
    biggerOffset.put((byte) 0);
    biggerOffset.putShort((short) 0);
    biggerOffset.put(initialBytes);
    while (biggerOffset.hasRemaining()) {
        biggerOffset.put((byte) remainingBytes);
    }
    biggerOffset.clear();
    return biggerOffset.asReadOnlyBuffer();
}