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:org.apache.cassandra.hadoop.ColumnFamilyRecordReader.java

@Override
public boolean next(ByteBuffer key, SortedMap<ByteBuffer, IColumn> value) throws IOException {
    if (this.nextKeyValue()) {
        key.clear();
        key.put(this.getCurrentKey());
        key.rewind();/*from  w ww .  j a va  2  s  .  c  om*/

        value.clear();
        value.putAll(this.getCurrentValue());

        return true;
    }
    return false;
}

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From source file:xbird.storage.io.RemoteVarSegments.java

private ByteBuffer truncateBuffer(final ByteBuffer buf, final int size) {
    if (size > buf.capacity()) {
        _rbufPool.returnObject(buf);/*from   w w  w .ja  v a 2 s.  c o  m*/
        return ByteBuffer.allocate(size); // TODO REVIEWME
    } else {
        buf.clear();
        buf.limit(size);
        return buf;
    }
}

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From source file:com.gpl_compression.lzo.LzoCompressor.java

/**
 * Reallocates a direct byte buffer by freeing the old one and allocating
 * a new one, unless the size is the same, in which case it is simply
 * cleared and returned./*ww  w. jav  a2s .c om*/
 *
 * NOTE: this uses unsafe APIs to manually free memory - if anyone else
 * has a reference to the 'buf' parameter they will likely read random
 * data or cause a segfault by accessing it.
 */
private ByteBuffer realloc(ByteBuffer buf, int newSize) {
    if (buf != null) {
        if (buf.capacity() == newSize) {
            // Can use existing buffer
            buf.clear();
            return buf;
        }
        try {
            // Manually free the old buffer using undocumented unsafe APIs.
            // If this fails, we'll drop the reference and hope GC finds it
            // eventually.
            Object cleaner = buf.getClass().getMethod("cleaner").invoke(buf);
            cleaner.getClass().getMethod("clean").invoke(cleaner);
        } catch (Exception e) {
            // Perhaps a non-sun-derived JVM - contributions welcome
            LOG.warn("Couldn't realloc bytebuffer", e);
        }
    }
    return ByteBuffer.allocateDirect(newSize);
}

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From source file:com.streamsets.pipeline.lib.generator.wholefile.WholeFileDataGenerator.java

@Override
public void write(Record record) throws IOException, DataGeneratorException {
    validateRecord(record);//from ww  w. jav  a  2 s .co  m
    FileRef fileRef = record.get(FileRefUtil.FILE_REF_FIELD_PATH).getValueAsFileRef();
    int bufferSize = fileRef.getBufferSize();
    boolean canUseDirectByteBuffer = fileRef.getSupportedStreamClasses().contains(ReadableByteChannel.class);
    if (canUseDirectByteBuffer) {
        //Don't have to close this here, because generate.close will call output stream close
        WritableByteChannel writableByteChannel = Channels.newChannel(outputStream); //NOSONAR
        try (ReadableByteChannel readableByteChannel = getReadableStream(fileRef, ReadableByteChannel.class)) {
            ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
            while ((readableByteChannel.read(buffer)) > 0) {
                //Flip to use the buffer from 0 to position.
                buffer.flip();
                while (buffer.hasRemaining()) {
                    writableByteChannel.write(buffer);
                }
                //Compact the buffer for reuse.
                buffer.clear();
            }
        }
    } else {
        byte[] b = new byte[bufferSize];
        try (InputStream stream = getReadableStream(fileRef, InputStream.class)) {
            IOUtils.copyLarge(stream, outputStream, b);
        }
    }
}

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From source file:acromusashi.kafka.log.producer.WinApacheLogProducer.java

/**
 * ????//from  w  w  w  .j a v  a2s .  c  o m
 *
 * @param random 
 * @return ?????
 * @throws IOException 
 */
private byte[] readToEnd(RandomAccessFile random) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ByteBuffer buffer = ByteBuffer.allocate(DEFAULT_ALLOCATE_SIZE);

    while ((random.getChannel().read(buffer)) != -1) {
        out.write(buffer.array());
        buffer.clear();
    }

    return out.toByteArray();
}

---

From source file:org.cloudata.core.commitlog.pipe.Message.java

public boolean write(SocketChannel channel) throws IOException {
    if (writingHeaderPhase) {
        ByteBuffer dupHeaderBuf = duplicate(headerBuf);
        dupHeaderBuf.position(writtenPosition);
        dupHeaderBuf.limit(headerBuf.capacity());
        channel.write(dupHeaderBuf);/*from w w w  .  j  a va 2 s .  c  om*/

        if (dupHeaderBuf.hasRemaining()) {
            writtenPosition = dupHeaderBuf.position();
            return false;
        }
        dupHeaderBuf.clear();
        writtenPosition = 0;
        writingHeaderPhase = false;
    }

    ByteBuffer dupBuffer = duplicate(buffer);
    dupBuffer.position(writtenPosition);
    dupBuffer.limit(buffer.capacity());
    channel.write(dupBuffer);

    if (dupBuffer.hasRemaining()) {
        writtenPosition = dupBuffer.position();
        return false;
    }

    writtenPosition = 0;
    writingHeaderPhase = true;
    dupBuffer.clear();
    return true;
}

---

From source file:com.cloud.maint.UpgradeManagerImpl.java

public String deployNewAgent(String url) {
    s_logger.info("Updating agent with binary from " + url);

    final HttpClient client = new HttpClient(s_httpClientManager);
    final GetMethod method = new GetMethod(url);
    int response;
    File file = null;/* w  w  w .ja  v a 2s  . c o m*/
    try {
        response = client.executeMethod(method);
        if (response != HttpURLConnection.HTTP_OK) {
            s_logger.warn("Retrieving the agent gives response code: " + response);
            return "Retrieving the file from " + url + " got response code: " + response;
        }

        final InputStream is = method.getResponseBodyAsStream();
        file = File.createTempFile("agent-", "-" + Long.toString(new Date().getTime()));
        file.deleteOnExit();

        s_logger.debug("Retrieving new agent into " + file.getAbsolutePath());

        final FileOutputStream fos = new FileOutputStream(file);

        final ByteBuffer buffer = ByteBuffer.allocate(2048);
        final ReadableByteChannel in = Channels.newChannel(is);
        final WritableByteChannel out = fos.getChannel();

        while (in.read(buffer) != -1) {
            buffer.flip();
            out.write(buffer);
            buffer.clear();
        }

        in.close();
        out.close();

        s_logger.debug("New Agent zip file is now retrieved");
    } catch (final HttpException e) {
        return "Unable to retrieve the file from " + url;
    } catch (final IOException e) {
        return "Unable to retrieve the file from " + url;
    } finally {
        method.releaseConnection();
    }

    file.delete();

    return "File will be deployed.";
}

---

From source file:edu.umn.cs.spatialHadoop.visualization.FrequencyMap.java

@Override
public void write(DataOutput out) throws IOException {
    super.write(out);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    GZIPOutputStream gzos = new GZIPOutputStream(baos);
    ByteBuffer bbuffer = ByteBuffer.allocate(getHeight() * 4 + 8);
    bbuffer.putInt(getWidth());/*  ww w  .  j av  a 2 s .c  om*/
    bbuffer.putInt(getHeight());
    gzos.write(bbuffer.array(), 0, bbuffer.position());
    for (int x = 0; x < getWidth(); x++) {
        bbuffer.clear();
        for (int y = 0; y < getHeight(); y++) {
            bbuffer.putFloat(frequencies[x][y]);
        }
        gzos.write(bbuffer.array(), 0, bbuffer.position());
    }
    gzos.close();

    byte[] serializedData = baos.toByteArray();
    out.writeInt(serializedData.length);
    out.write(serializedData);
}

---

From source file:net.ymate.platform.serv.nio.support.NioSession.java

public void read() throws IOException {
    if (__buffer == null) {
        __buffer = ByteBufferBuilder.allocate(__eventGroup.bufferSize());
    }/* ww  w.ja v a 2 s . c o  m*/
    ByteBuffer _data = ByteBuffer.allocate(__eventGroup.bufferSize());
    int _len = 0;
    while ((_len = __doChannelRead(_data)) > 0) {
        _data.flip();
        __buffer.append(_data.array(), _data.position(), _data.remaining());
        _data.clear();
    }
    if (_len < 0) {
        close();
        return;
    }
    ByteBufferBuilder _copiedBuffer = __buffer.duplicate().flip();
    while (true) {
        _copiedBuffer.mark();
        Object _message = null;
        if (_copiedBuffer.remaining() > 0) {
            _message = __eventGroup.codec().decode(_copiedBuffer);
        } else {
            _message = null;
        }
        if (_message == null) {
            _copiedBuffer.reset();
            __doBufferReset(_copiedBuffer);
            break;
        } else {
            final Object _copiedObj = _message;
            __eventGroup.executorService().submit(new Runnable() {
                public void run() {
                    try {
                        __eventGroup.listener().onMessageReceived(_copiedObj, NioSession.this);
                    } catch (IOException e) {
                        try {
                            __eventGroup.listener().onExceptionCaught(e, NioSession.this);
                        } catch (IOException ex) {
                            try {
                                close();
                            } catch (Throwable exx) {
                                _LOG.error(exx.getMessage(), RuntimeUtils.unwrapThrow(exx));
                            }
                        }
                    }
                }
            });
        }
    }
}

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From source file:org.apache.vxquery.xtest.TestRunner.java

public TestCaseResult run(final TestCase testCase) {
    TestCaseResult res = new TestCaseResult(testCase);
    if (opts.verbose) {
        System.err.println("Starting " + testCase.getXQueryDisplayName());
    }/*from  ww  w  .  j av a  2 s  . c  o  m*/

    long start = System.currentTimeMillis();

    try {
        try {
            FileInputStream query = new FileInputStream(testCase.getXQueryFile());
            if (opts.showQuery) {
                System.err.println("***Query for " + testCase.getXQueryDisplayName() + ": ");
                System.err.println(IOUtils.toString(query, "UTF-8"));
            }

            VXQueryCompilationListener listener = new VXQueryCompilationListener(opts.showAST, opts.showTET,
                    opts.showOET, opts.showRP);
            XMLQueryCompiler compiler = new XMLQueryCompiler(listener, new String[] { "nc1" }, opts.frameSize);
            Reader in = new InputStreamReader(new FileInputStream(testCase.getXQueryFile()), "UTF-8");
            CompilerControlBlock ccb = new CompilerControlBlock(
                    new StaticContextImpl(RootStaticContextImpl.INSTANCE),
                    new ResultSetId(testCase.getXQueryDisplayName().hashCode()), testCase.getSourceFileMap());
            compiler.compile(testCase.getXQueryDisplayName(), in, ccb, opts.optimizationLevel);
            JobSpecification spec = compiler.getModule().getHyracksJobSpecification();
            in.close();

            DynamicContext dCtx = new DynamicContextImpl(compiler.getModule().getModuleContext());
            spec.setGlobalJobDataFactory(new VXQueryGlobalDataFactory(dCtx.createFactory()));

            spec.setMaxReattempts(0);
            JobId jobId = hcc.startJob(spec, EnumSet.of(JobFlag.PROFILE_RUNTIME));

            if (hds == null) {
                hds = new HyracksDataset(hcc, spec.getFrameSize(), opts.threads);
            }
            ByteBuffer buffer = ByteBuffer.allocate(spec.getFrameSize());
            IHyracksDatasetReader reader = hds.createReader(jobId, ccb.getResultSetId());
            IFrameTupleAccessor frameTupleAccessor = new ResultFrameTupleAccessor(spec.getFrameSize());
            buffer.clear();
            res.result = "";
            while (reader.read(buffer) > 0) {
                buffer.clear();
                res.result += ResultUtils.getStringFromBuffer(buffer, frameTupleAccessor);
            }
            res.result.trim();
            hcc.waitForCompletion(jobId);
        } catch (HyracksException e) {
            Throwable t = e;
            while (t.getCause() != null) {
                t = t.getCause();
            }
            Matcher m = EMBEDDED_SYSERROR_PATTERN.matcher(t.getMessage());
            if (m.find()) {
                String eCode = m.group(1);
                throw new SystemException(ErrorCode.valueOf(eCode), e);
            }
            throw e;
        }
    } catch (Throwable e) {
        // Check for nested SystemExceptions.
        Throwable error = e;
        while (error != null) {
            if (error instanceof SystemException) {
                res.error = error;
                break;
            }
            error = error.getCause();
        }
        // Default
        if (res.error == null) {
            res.error = e;
        }
    } finally {
        try {
            res.compare();
        } catch (Exception e) {
            System.err.println("Framework error");
            e.printStackTrace();
        }
        long end = System.currentTimeMillis();
        res.time = end - start;
    }
    if (opts.showResult) {
        if (res.result == null) {
            System.err.println("***Error: ");
            System.err.println("Message: " + res.error.getMessage());
            res.error.printStackTrace();
        } else {
            System.err.println("***Result: ");
            System.err.println(res.result);
        }
    }
    return res;
}

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