Example usage for java.nio ByteBuffer clear

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.github.ambry.utils.UtilsTest.java

@Test
public void testReadFileToByteBuffer() throws IOException {
    File file = File.createTempFile("test", "1");
    file.deleteOnExit();//w  w w  .j  a v  a2  s .com
    FileChannel fileChannel = Utils.openChannel(file, false);
    byte[] referenceBytes = new byte[20];
    new Random().nextBytes(referenceBytes);
    FileUtils.writeByteArrayToFile(file, referenceBytes);

    // fill up fresh byteBuffer
    ByteBuffer buffer = ByteBuffer.allocate(20);
    Utils.readFileToByteBuffer(fileChannel, 0, buffer);
    assertArrayEquals("Data mismatch", referenceBytes, buffer.array());

    // write to byteBuffer based on buffer remaining
    buffer.limit(10);
    buffer.position(0);
    assertEquals("buffer remaining should be 10", 10, buffer.remaining());
    Utils.readFileToByteBuffer(fileChannel, 10, buffer);
    assertEquals("buffer remaining should be 0", 0, buffer.remaining());
    for (int i = 0; i < 10; i++) {
        assertEquals("First 10 bytes in buffer should match last 10 bytes in file", buffer.array()[i],
                referenceBytes[i + 10]);
    }

    // byteBuffer.remaining() + starting offset > file size, exception is expected.
    buffer.clear();
    assertEquals("buffer remaining should be 20", 20, buffer.remaining());
    try {
        Utils.readFileToByteBuffer(fileChannel, 1, buffer);
        fail("Should fail");
    } catch (IOException e) {
    }

    // starting offset exceeds file size, exception is expected.
    buffer.clear();
    assertEquals("buffer remaining should be 20", 20, buffer.remaining());
    try {
        Utils.readFileToByteBuffer(fileChannel, 21, buffer);
        fail("Should fail");
    } catch (IOException e) {
    }
}

---

From source file:com.example.android.toyvpn.ToyVpnService.java

@Override
public synchronized void run() {
    try {//  w ww . jav  a  2 s.c  om
        //a. Configure the TUN and get the interface.
        Log.i("VPNService IP", getLocalIpAddress());

        mInterface = builder.setSession("MyVPNService")
                //.setMtu(1500)
                .addAddress("10.0.2.0", 32).addRoute("0.0.0.0", 0).establish();
        //.addDnsServer("8.8.8.8").establish();
        //b. Packets to be sent are queued in this input stream.
        FileInputStream in = new FileInputStream(mInterface.getFileDescriptor());
        //b. Packets received need to be written to this output stream.
        FileOutputStream out = new FileOutputStream(mInterface.getFileDescriptor());
        //c. The UDP channel can be used to pass/get ip package to/from server
        //DatagramChannel tunnel = DatagramChannel.open();
        // Connect to the server, localhost is used for demonstration only.
        //tunnel.connect(new InetSocketAddress("127.0.0.1",mServerPort));
        //d. Protect this socket, so package send by it will not be feedback to the vpn service.
        //protect(tunnel.socket());

        ByteBuffer packet = ByteBuffer.allocate(32767);
        int timer = 0;
        int length = 0;
        boolean idle;

        //e. Use a loop to pass packets.
        while (true) {

            //idle = true;

            // Read the outgoing packet from the input stream.
            length = in.read(packet.array());
            if (length > 0) {
                //Log.i("VpnService", "Out Pck size " + length);
                Packet pktInfo = new Packet(packet);
                //Log.i("VpnService",  pktInfo.ip4Header.destinationAddress + "");

                if (pktInfo.isTCP()) {
                    //TCPProxy
                    //Log.i("VpnService", "TCP: " + pktInfo.tcpHeader.destinationPort + "");
                } else if (pktInfo.isUDP()) {
                    //UDPProxy
                    Log.i("VpnService", "UDP Destport:" + pktInfo.udpHeader.destinationPort + "");
                    UDPtoProxy(packet);
                }
                //TODO Send the outgoing packet to the ProxyServer.
                packet.clear();

                //idle = false;
            }
            Thread.sleep(100);
            // Thread.sleep(100);
            // If we are idle or waiting for the network, sleep for a
            // fraction of time to avoid busy looping.
            // if (idle) {
            //      Thread.sleep(100);
            //     }   
        }
    } catch (Exception e) {
        // Catch any exception
        e.printStackTrace();
    } finally {
        try {
            if (mInterface != null) {
                mInterface.close();
                mInterface = null;
            }
        } catch (Exception e) {

        }
    }
}

---

From source file:com.colorchen.qbase.utils.FileUtil.java

/**
 * ?//from w  w w  . j  ava2  s .  c  o  m
 *
 * @param outFile
 * @param files
 */
public static void mergeFiles(Context context, File outFile, List<File> files) {
    FileChannel outChannel = null;
    try {
        outChannel = new FileOutputStream(outFile).getChannel();
        for (File f : files) {
            FileChannel fc = new FileInputStream(f).getChannel();
            ByteBuffer bb = ByteBuffer.allocate(BUFSIZE);
            while (fc.read(bb) != -1) {
                bb.flip();
                outChannel.write(bb);
                bb.clear();
            }
            fc.close();
        }
        Log.d(TAG, "?");
    } catch (IOException ioe) {
        ioe.printStackTrace();
    } finally {
        try {
            if (outChannel != null) {
                outChannel.close();
            }
        } catch (IOException ignore) {
        }
    }
}

---

From source file:cn.ac.ncic.mastiff.io.coding.DictionaryBitPackingRLEIntReader.java

@Override
public byte[] ensureDecompressed() throws IOException {
    FlexibleEncoding.ORC.DynamicByteArray dynamicBuffer = new FlexibleEncoding.ORC.DynamicByteArray();
    dynamicBuffer.add(inBuf.getData(), 12, inBuf.getLength() - 12);
    ByteBuffer byteBuf = ByteBuffer.allocate(dynamicBuffer.size());
    dynamicBuffer.setByteBuffer(byteBuf, 0, dynamicBuffer.size());
    byteBuf.flip();/*from  ww  w. ja va2 s. com*/
    DataInputBuffer dib = new DataInputBuffer();
    dib.reset(byteBuf.array(), 0, byteBuf.array().length);
    int dictionarySize = dib.readInt();
    int OnlydictionarySize = dib.readInt();
    dib.reset(byteBuf.array(), 8, dictionarySize - 4);
    byte[] dictionaryBuffer = dib.getData();
    dib.reset(byteBuf.array(), 4 + dictionarySize, (byteBuf.array().length - dictionarySize - 4));
    byte[] dictionaryId = dib.getData();
    dib.close();
    DictionaryValuesReader cr = initDicReader(OnlydictionarySize, dictionaryBuffer,
            PrimitiveType.PrimitiveTypeName.INT32);
    cr.initFromPage(numPairs, dictionaryId, 0);
    DataOutputBuffer decoding = new DataOutputBuffer();
    decoding.writeInt(decompressedSize);
    decoding.writeInt(numPairs);
    decoding.writeInt(startPos);
    for (int i = 0; i < numPairs; i++) {
        int tmp = cr.readInteger();
        decoding.writeInt(tmp);
    }
    byteBuf.clear();
    inBuf.close();
    return decoding.getData();
}

---

From source file:cn.ac.ncic.mastiff.io.coding.DictionaryBitPackingRLEIntReader.java

public byte[] CompressensureDecompressed() throws IOException {
    FlexibleEncoding.ORC.DynamicByteArray dynamicBuffer = new FlexibleEncoding.ORC.DynamicByteArray();
    dynamicBuffer.add(inBuf.getData(), 0, inBuf.getLength());
    ByteBuffer byteBuf = ByteBuffer.allocate(dynamicBuffer.size());
    dynamicBuffer.setByteBuffer(byteBuf, 0, dynamicBuffer.size());
    byteBuf.flip();//from  w ww  .j a v  a 2 s  .c om
    DataInputBuffer dib = new DataInputBuffer();
    dib.reset(byteBuf.array(), 0, byteBuf.array().length);
    int dictionarySize = dib.readInt();
    int OnlydictionarySize = dib.readInt();
    dib.reset(byteBuf.array(), 8, dictionarySize - 4);
    byte[] dictionaryBuffer = dib.getData();
    dib.reset(byteBuf.array(), 4 + dictionarySize, (byteBuf.array().length - dictionarySize - 4));
    byte[] dictionaryId = dib.getData();
    dib.close();
    DictionaryValuesReader cr = initDicReader(OnlydictionarySize, dictionaryBuffer,
            PrimitiveType.PrimitiveTypeName.INT32);
    cr.initFromPage(numPairs, dictionaryId, 0);
    DataOutputBuffer decoding = new DataOutputBuffer();
    decoding.writeInt(decompressedSize);
    decoding.writeInt(numPairs);
    decoding.writeInt(startPos);
    for (int i = 0; i < numPairs; i++) {
        int tmp = cr.readInteger();
        decoding.writeInt(tmp);
    }
    byteBuf.clear();

    inBuf.close();
    return decoding.getData();

}

---

From source file:de.fhg.fokus.diameter.DiameterPeer.transport.Communicator.java

public void run() {
    MessageInfo messageInfo = null;//  ww  w. j a v  a 2 s .  co  m
    ByteBuffer receiveByteBuffer = ByteBuffer.allocateDirect(MAX_MESSAGE_LENGTH);
    DiameterMessage msg = null;
    byte[] buffer = null;
    int len = 0;
    //handler to keep track of association setup and termination
    AssociationHandler assocHandler = new AssociationHandler();
    try {
        while (this.running) {
            messageInfo = sctpChannel.receive(receiveByteBuffer, System.out, assocHandler);
            log.debug("Received msg from communicator:" + this + " and sctpChannel:" + sctpChannel);
            log.debug("Received msg's length:" + messageInfo.bytes());
            log.error("Received msg's length:" + messageInfo.bytes());
            receiveByteBuffer.flip();

            if (receiveByteBuffer.remaining() > 0) {
                buffer = new byte[messageInfo.bytes()];
                receiveByteBuffer.get(buffer);
                receiveByteBuffer.clear();
                // log.debug("The origin message stream  is:\n" + CommonMethod.byteToHex(buffer));
                //first we check the version
                if (buffer[0] != 1) {
                    log.error("Expecting diameter version 1, received version " + buffer[0]);
                    continue;
                }
                //then we check the length of the message
                len = ((int) buffer[1] & 0xFF) << 16 | ((int) buffer[2] & 0xFF) << 8 | ((int) buffer[3] & 0xFF);
                if (len > MAX_MESSAGE_LENGTH) {
                    log.error("Message too long (msg length:" + len + " > max buffer length:"
                            + MAX_MESSAGE_LENGTH + ").");
                    continue;
                }
                //now we can decode the message
                try {
                    msg = Codec.decodeDiameterMessage(buffer, 0);
                } catch (DiameterMessageDecodeException e) {
                    log.error("Error decoding diameter message !");
                    log.error(e, e);
                    msg = null;
                    continue;
                }
                msg.networkTime = System.currentTimeMillis();
                log.debug("Received message is:\n" + msg);
                if (this.peer != null) {
                    this.peer.refreshTimer();
                }
                processMessage(msg);
            }
            msg = null;
        }
    } catch (Exception e1) {
        log.error("Exception:" + e1.getCause() + " catched in communicator:" + this + " and running flag="
                + running);
        if (this.running) {
            if (this.peer != null) {
                if (this.peer.I_comm == this) {
                    StateMachine.process(this.peer, StateMachine.I_Peer_Disc);
                }
                if (this.peer.R_comm == this) {
                    log.error("Now closing the peer:" + this.peer);
                    StateMachine.process(this.peer, StateMachine.R_Peer_Disc);
                }
            }
            log.error("Error reading from sctpChannel:" + sctpChannel + ", the channel might be colsed.");

        } /* else it was a shutdown request, it's normal */
    }
    log.debug("Now closing communicator:" + this + ", and it's sctpChannel:" + sctpChannel);
    this.running = false;
    try {
        sctpChannel.close();
    } catch (IOException e) {
        log.error("Error closing sctpChannel !");
        log.error(e, e);
    }
}

---

From source file:cn.ac.ncic.mastiff.io.coding.DictionaryBitPackingRLEByteReader.java

public byte[] CompressensureDecompressed() throws IOException {
    FlexibleEncoding.ORC.DynamicByteArray dynamicBuffer = new FlexibleEncoding.ORC.DynamicByteArray();
    dynamicBuffer.add(inBuf.getData(), 0, inBuf.getLength());
    ByteBuffer byteBuf = ByteBuffer.allocate(dynamicBuffer.size());
    dynamicBuffer.setByteBuffer(byteBuf, 0, dynamicBuffer.size());
    byteBuf.flip();/*from w  w  w  .j a  v a 2  s. c  o  m*/
    DataInputBuffer dib = new DataInputBuffer();
    dib.reset(byteBuf.array(), 0, byteBuf.array().length);
    int dictionarySize = dib.readInt();
    int OnlydictionarySize = dib.readInt();
    dib.reset(byteBuf.array(), 8, dictionarySize - 4);
    byte[] dictionaryBuffer = dib.getData();
    dib.reset(byteBuf.array(), 4 + dictionarySize, (byteBuf.array().length - dictionarySize - 4));
    byte[] dictionaryId = dib.getData();
    dib.close();
    DictionaryValuesReader cr = initDicReader(OnlydictionarySize, dictionaryBuffer,
            PrimitiveType.PrimitiveTypeName.BINARY);
    cr.initFromPage(numPairs, dictionaryId, 0);
    DataOutputBuffer decoding = new DataOutputBuffer();
    decoding.writeInt(decompressedSize);
    decoding.writeInt(numPairs);
    decoding.writeInt(startPos);
    for (int i = 0; i < numPairs; i++) {
        byte tmp = Byte.parseByte(cr.readBytes().toStringUsingUTF8());
        decoding.writeInt(tmp);
    }
    byteBuf.clear();
    inBuf.close();
    return decoding.getData();
}

---

From source file:cn.ac.ncic.mastiff.io.coding.DictionaryBitPackingRLEByteReader.java

@Override
public byte[] ensureDecompressed() throws IOException {
    FlexibleEncoding.ORC.DynamicByteArray dynamicBuffer = new FlexibleEncoding.ORC.DynamicByteArray();
    dynamicBuffer.add(inBuf.getData(), 12, inBuf.getLength() - 12);
    ByteBuffer byteBuf = ByteBuffer.allocate(dynamicBuffer.size());
    dynamicBuffer.setByteBuffer(byteBuf, 0, dynamicBuffer.size());
    byteBuf.flip();/* www  . j  a  v  a 2s  .  com*/
    DataInputBuffer dib = new DataInputBuffer();
    dib.reset(byteBuf.array(), 0, byteBuf.array().length);
    int dictionarySize = dib.readInt();
    int OnlydictionarySize = dib.readInt();
    dib.reset(byteBuf.array(), 8, dictionarySize - 4);
    byte[] dictionaryBuffer = dib.getData();
    dib.reset(byteBuf.array(), 4 + dictionarySize, (byteBuf.array().length - dictionarySize - 4));
    byte[] dictionaryId = dib.getData();
    dib.close();
    DictionaryValuesReader cr = initDicReader(OnlydictionarySize, dictionaryBuffer,
            PrimitiveType.PrimitiveTypeName.BINARY);
    cr.initFromPage(numPairs, dictionaryId, 0);
    DataOutputBuffer decoding = new DataOutputBuffer();
    decoding.writeInt(decompressedSize);
    decoding.writeInt(numPairs);
    decoding.writeInt(startPos);
    for (int i = 0; i < numPairs; i++) {
        byte tmp = Byte.parseByte(cr.readBytes().toStringUsingUTF8());
        decoding.writeInt(tmp);
    }
    byteBuf.clear();
    inBuf.close();
    return decoding.getData();

}

---

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

/**
 * Read external with codec.//from  ww  w .  j a v a  2  s. c om
 *
 * @param blockName the block name
 * @return the cacheable
 * @throws IOException Signals that an I/O exception has occurred.
 */
@SuppressWarnings("unused")
private Cacheable readExternalWithCodec(String blockName, boolean repeat, boolean caching) 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 = storage.newStorageHandle();
        byte[] data = (byte[]) extStorageCache.get(hashed);
        if (data == null) {
            if (repeat == false)
                extRefStats.miss(caching);
            return null;
        } else {
            extRefStats.hit(caching);
        }
        // Initialize handle 
        handle.fromBytes(data);

        ByteBuffer buffer = extStorageCache.getLocalBufferWithAddress().getBuffer();
        SerDe serde = extStorageCache.getSerDe();
        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) {
            // BIGBASE-45
            // Remove reference from reference cache
            // reference is in L3-RAM cache but no object in L3-DISK cache was found
            // remove only if handle is invalid
            if (storage.isValid(handle) == false) {
                extStorageCache.remove(hashed);
            }
            return null;
        }
        // Skip key
        int keySize = buffer.getInt();
        buffer.position(8 + keySize);

        boolean inMemory = buffer.get() == (byte) 1;

        buffer.limit(size + 4);
        Cacheable obj = (Cacheable) serde.readCompressed(buffer/*, codec*/);
        offHeapCache.put(blockName, obj);

        if (newHandle.equals(handle) == false) {
            extStorageCache.put(hashed, newHandle.toBytes());
        }

        return obj;

    } catch (Throwable e) {
        fatalExternalReads.incrementAndGet();
        throw new IOException(e);
    }

}

---

From source file:com.healthmarketscience.jackcess.Database.java

/**
 * Copies the given InputStream to the given channel using the most
 * efficient means possible.//from www  .ja va2s  .c om
 */
private static void transferFrom(FileChannel channel, InputStream in) throws IOException {
    ReadableByteChannel readChannel = Channels.newChannel(in);
    if (!BROKEN_NIO) {
        // sane implementation
        channel.transferFrom(readChannel, 0, MAX_EMPTYDB_SIZE);
    } else {
        // do things the hard way for broken vms
        ByteBuffer bb = ByteBuffer.allocate(8096);
        while (readChannel.read(bb) >= 0) {
            bb.flip();
            channel.write(bb);
            bb.clear();
        }
    }
}

---

• «
• 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
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• »