Example usage for java.nio ByteBuffer allocate

Introduction

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

Prototype

public static ByteBuffer allocate(int capacity) 

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:de.csdev.ebus.command.EBusCommandUtils.java

/**
 * Build a complete telegram for master/slave, master/master and broadcasts
 *
 * @param source// ww w  .j  a v a2 s  . co m
 * @param target
 * @param command
 * @param masterData
 * @param slaveData
 * @return
 * @throws EBusTypeException
 */
public static ByteBuffer buildCompleteTelegram(byte source, byte target, byte[] command, byte[] masterData,
        byte[] slaveData) throws EBusTypeException {

    boolean isMastereMaster = EBusUtils.isMasterAddress(target);
    boolean isBroadcast = target == EBusConsts.BROADCAST_ADDRESS;
    boolean isMasterSlave = !isMastereMaster && !isBroadcast;

    ByteBuffer buf = ByteBuffer.allocate(50);
    buf.put(buildPartMasterTelegram(source, target, command, masterData));

    // if used compute a complete telegram
    if (isMasterSlave && slaveData != null) {
        ByteBuffer slaveTelegramPart = buildPartSlave(slaveData);
        buf.put(slaveTelegramPart);

        buf.put(EBusConsts.ACK_OK);
        buf.put(EBusConsts.SYN);
    }

    if (isMastereMaster) {
        buf.put(EBusConsts.ACK_OK);
        buf.put(EBusConsts.SYN);
    }

    if (isBroadcast) {
        buf.put(EBusConsts.SYN);
    }

    // set limit and reset position
    buf.limit(buf.position());
    buf.position(0);

    return buf;
}

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From source file:com.koda.integ.hbase.test.TestHFileBlockIndexer.java

@Override
protected void setUp() {
    if (buffer != null)
        return;/*from  ww w.ja v  a 2s .c om*/
    buffer = ByteBuffer.allocate(bufferSize);
    array = new KeyValue[N];
    populateData();
    serializeData();
    try {
        indexBlock();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

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From source file:com.netflix.spectator.tdigest.Json.java

/** Encode the measurement using the generator. */
void encode(Map<String, String> commonTags, TDigestMeasurement m, JsonGenerator gen) throws IOException {
    TDigest digest = m.value();//from  w  w w.  java 2 s. c  om
    digest.compress();
    ByteBuffer buf = ByteBuffer.allocate(digest.byteSize());
    digest.asBytes(buf);

    gen.writeStartArray();
    gen.writeStartObject();
    gen.writeStringField("name", m.id().name());
    for (Map.Entry<String, String> e : commonTags.entrySet()) {
        gen.writeStringField(e.getKey(), e.getValue());
    }
    for (Tag t : m.id().tags()) {
        gen.writeStringField(t.key(), t.value());
    }
    gen.writeEndObject();
    gen.writeNumber(m.timestamp());
    gen.writeBinary(buf.array());
    gen.writeEndArray();
}

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From source file:com.datatorrent.contrib.hdht.PurgeTest.java

@Test
public void testCacheWithPurge() {
    List<byte[]> dataList = Lists.newArrayList();
    byte[] deleted = HDHTWriter.DELETED;
    WriteCache cache = new WriteCache(new HDHTWriter.DefaultKeyComparator());
    for (int i = 0; i < 10; i++) {
        Slice s = new Slice(ByteBuffer.allocate(4).putInt(i).array());
        byte[] data = ByteBuffer.allocate(4).putInt(i).array();
        dataList.add(data);/*from   w  w  w .  ja  v a2 s  . c om*/
        cache.put(s, data);
    }
    Slice start = new Slice(ByteBuffer.allocate(4).putInt(2).array());
    Slice end = new Slice(ByteBuffer.allocate(4).putInt(5).array());

    Assert.assertEquals("Number of element in cache", 10, cache.size());
    cache.purge(start, end);
    Assert.assertEquals("Number of element in cache after purge", 6, cache.size());

    // data available after purge.
    byte[] data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(1).array()));
    Assert.assertEquals("Byte data ", data, dataList.get(1));

    // data at start of purge list
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(2).array()));
    Assert.assertEquals("Byte data ", data, HDHTWriter.DELETED);

    // data in between purge list
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(3).array()));
    Assert.assertEquals("Byte data ", data, HDHTWriter.DELETED);

    // data at end of purge list.
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(5).array()));
    Assert.assertEquals("Byte data ", data, HDHTWriter.DELETED);

    // just after purge end.
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(6).array()));
    Assert.assertEquals("Byte data ", data, dataList.get(6));

    // data not available should return null
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(10).array()));
    Assert.assertEquals("Invalid data", data, null);

    /**
     * Add a new data in the purge list
     * get on newly added data should return valid data.
     */
    cache.put(new Slice(ByteBuffer.allocate(4).putInt(3).array()), dataList.get(3));
    data = cache.get(new Slice(ByteBuffer.allocate(4).putInt(3).array()));
    Assert.assertEquals("Data added after purge is available", data, dataList.get(3));
}

---

From source file:com.dreamwork.web.FrontJsonController.java

private byte[] read(InputStream in) throws IOException {
    ByteBuffer fullBytesRed = ByteBuffer.allocate(0);
    int n;//from ww w .  j a v  a  2  s.  c  om
    while (true) {
        byte[] b = new byte[2048];
        n = in.read(b);
        if (n == -1) {
            break;
        }
        byte[] currBytes = fullBytesRed.array();
        fullBytesRed = ByteBuffer.allocate(currBytes.length + n);
        fullBytesRed.put(currBytes);
        fullBytesRed.put(b, 0, n);
    }
    byte[] data = fullBytesRed.array();
    return data;
}

---

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

/**
 * Constructs a {@link PreferFailurePcpOption}.
 */
public PreferFailurePcpOption() {
    super(2, ByteBuffer.allocate(0));
}

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From source file:com.netflix.aegisthus.pig.AegisthusLoadCaster.java

@Override
public Float bytesToFloat(byte[] arg0) throws IOException {
    if (arg0 == null || arg0.length == 0) {
        return null;
    }//from  w  ww  .j  ava2 s. c  o m
    try {
        byte[] by = hex.decode(arg0);
        ByteBuffer bb = ByteBuffer.allocate(by.length);
        bb.put(by);
        bb.position(0);
        return bb.getFloat();
    } catch (Exception e) {
        LOG.error("failed to convert " + new String(arg0) + " to float");
        return null;
    }
}

---

From source file:com.github.neoio.net.message.staging.file.TestFileMessageStaging.java

@Test
public void test_primaryStage() throws Exception {
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    buffer.put("Hello World".getBytes());
    buffer.flip();/* w w  w . ja v  a 2  s  .c  o  m*/
    staging.writePrimaryStaging(buffer, "Hello World".getBytes().length);

    buffer.clear();
    staging.getPrimaryStage().read(buffer);
    Assert.assertEquals("Hello World".getBytes().length, staging.getPrimaryStageSize());
    Assert.assertEquals("Hello World", new String(buffer.array(), 0, buffer.position()));

    staging.resetPrimaryStage();
    Assert.assertEquals(0, staging.getPrimaryStageSize());
}

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From source file:org.lispmob.noroot.IPC.java

public void run() {
    int len = 0;//w  ww .j a v  a  2 s .c o m
    ByteBuffer buf = ByteBuffer.allocate(9000);
    while (!ipc_thread.isInterrupted()) {
        buf.clear();
        try {
            len = ipc_channel.read(buf);
            if (len == 0) {
                continue;
            }
            buf.flip();
            String json_str = EncodingUtils.getString(buf.array(), "utf8");
            JSONObject jObj = new JSONObject(json_str);
            int ipc_type = jObj.getInt("type");
            System.out.println("LISPmob: Received IPC message: " + ipc_type);
            switch (ipc_type) {
            case IPC_LOG_MSG:
                LISPmobVPNService.err_msg_code = jObj.getInt("err_msg_code");
                Thread.sleep(1000);
                if (LISPmobVPNService.err_msg_code != 0) {
                    /* If LISPmob is not the active windows, the error msg code is not clean
                     * and we send a notification of the error */
                    Resources res = vpn_service.getResources();
                    String[] err_msg = res.getStringArray(R.array.ErrMsgArray);
                    String msg = err_msg[LISPmobVPNService.err_msg_code];
                    //notifications.notify_msg( msg);
                }
                break;
            case IPC_PROTECT_SOCKS:
                int socket = jObj.getInt("socket");
                if (socket != -1) {
                    boolean sock_protect = false;
                    int retry = 0;
                    while (!sock_protect && retry < 30) {
                        if (!vpn_service.protect(socket)) {
                            retry++;
                            Thread.sleep(200);
                        } else {
                            sock_protect = true;
                            System.out.println(
                                    "LISPmob: The socket " + socket + " has been protected (VPN Service)");
                        }
                    }
                }
                break;
            default:
                System.out.println("***** Unknown IPC message: " + ipc_type);
                break;
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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From source file:at.tfr.securefs.client.ClientMessageHandlerImpl.java

public void write(InputStream is, final String path) throws IOException {

    final ChannelPipe<StreamSourceChannel, StreamSinkChannel> pipe = xnioWorker.createHalfDuplexPipe();
    final String uniqueKey = pipe.toString();

    pipe.getLeftSide().getReadSetter().set(new ChannelListener<StreamSourceChannel>() {
        private final ByteBuffer buff = ByteBuffer.allocate(Constants.BUFFER_SIZE);

        public void handleEvent(StreamSourceChannel channel) {
            Message msg = null;/* w  w  w.jav  a2  s .  c  o m*/
            buff.clear();
            try {

                int count;
                while ((count = channel.read(buff)) > 0) {
                    buff.flip();
                    if (buff.hasRemaining()) {
                        msg = new Message(MessageType.DATA, path, buff).key(uniqueKey);
                        messageSender.send(msg);
                    }
                }
                if (count < 0) {
                    IoUtils.safeClose(channel);
                } else {
                    channel.resumeReads();
                }

            } catch (IOException e) {
                log.warn("cannot write message: " + msg, e);
                IoUtils.safeClose(channel);
            }
        }
    });

    pipe.getLeftSide().getCloseSetter().set(new ChannelListener<StreamSourceChannel>() {

        @Override
        public void handleEvent(StreamSourceChannel channel) {
            activeStreams.getStreams().remove(uniqueKey);
            messageSender.send(new Message(MessageType.CLOSE, path).key(uniqueKey));
        }
    });

    pipe.getRightSide().getWriteSetter().set(new ChannelListener<StreamSinkChannel>() {
        private byte[] bytes = new byte[Constants.BUFFER_SIZE];

        @Override
        public void handleEvent(StreamSinkChannel channel) {
            try {
                int count = 0;
                while ((count = is.read(bytes, 0, bytes.length)) > 0) {
                    Channels.writeBlocking(channel, ByteBuffer.wrap(bytes, 0, count));
                }

                if (count < 0) {
                    IoUtils.safeClose(channel);
                } else {
                    channel.resumeWrites();
                }
            } catch (Exception e) {
                log.warn("cannot read from cypher: " + e, e);
                IoUtils.safeClose(channel);
            }
        }
    });

    try {
        messageSender.send(new Message(MessageType.OPEN, MessageSubType.WRITE, path).key(uniqueKey));
    } catch (Exception e) {
        IoUtils.safeClose(pipe.getLeftSide());
        IoUtils.safeClose(pipe.getRightSide());
        throw new IOException("cannot initiate OPEN: " + e, e);
    }

    activeStreams.getStreams().put(uniqueKey,
            new StreamInfo<ChannelPipe<StreamSourceChannel, StreamSinkChannel>>(pipe, path));

    // start sending data:
    pipe.getLeftSide().resumeReads();
    pipe.getRightSide().resumeWrites();
}

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