Example usage for java.nio ByteBuffer allocateDirect

Introduction

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

Prototype

public static ByteBuffer allocateDirect(int capacity) 

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

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

@Test
public void testEstimationReadOnlyByteBuffers() {
    Random random = new Random(0L);

    final int[] valsToCheck = { 10, 20, 50, 100, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 1000000,
            2000000 };//from  www.  jav a  2  s  .  c o m
    final double[] expectedVals = { 11.029647221949576, 21.108407720752034, 51.64575281885815,
            100.42231726408892, 981.8579991802412, 1943.1337257462792, 4946.192042635218, 9935.088157579434,
            20366.1486889433, 49433.56029693898, 100615.26273314281, 980831.624899156000, 1982408.2608981386 };

    int valsToCheckIndex = 0;
    HyperLogLogCollector collector = HyperLogLogCollector
            .makeCollector(ByteBuffer.allocateDirect(HyperLogLogCollector.getLatestNumBytesForDenseStorage()));
    for (int i = 0; i < valsToCheck[valsToCheck.length - 1]; ++i) {
        collector.add(fn.hashLong(random.nextLong()).asBytes());
        if (i == valsToCheck[valsToCheckIndex]) {
            Assert.assertEquals(expectedVals[valsToCheckIndex], collector.estimateCardinality(), 0.0d);
            ++valsToCheckIndex;
        }
    }
    Assert.assertEquals(expectedVals.length, valsToCheckIndex + 1);
    Assert.assertEquals(expectedVals[valsToCheckIndex], collector.estimateCardinality(), 0.0d);
}

---

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

@Test
public void testEstimationReadOnlyByteBuffers() throws Exception {
    Random random = new Random(0L);

    final int[] valsToCheck = { 10, 20, 50, 100, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 1000000,
            2000000 };//from  ww w .  j  a va 2s  .c o  m
    final double[] expectedVals = { 11.029647221949576, 21.108407720752034, 51.64575281885815,
            100.42231726408892, 981.8579991802412, 1943.1337257462792, 4946.192042635218, 9935.088157579434,
            20366.1486889433, 49433.56029693898, 100615.26273314281, 980831.624899156000, 1982408.2608981386 };

    int valsToCheckIndex = 0;
    HyperLogLogCollector collector = HyperLogLogCollector
            .makeCollector(ByteBuffer.allocateDirect(HyperLogLogCollector.getLatestNumBytesForDenseStorage()));
    for (int i = 0; i < valsToCheck[valsToCheck.length - 1]; ++i) {
        collector.add(fn.hashLong(random.nextLong()).asBytes());
        if (i == valsToCheck[valsToCheckIndex]) {
            Assert.assertEquals(expectedVals[valsToCheckIndex], collector.estimateCardinality(), 0.0d);
            ++valsToCheckIndex;
        }
    }
    Assert.assertEquals(expectedVals.length, valsToCheckIndex + 1);
    Assert.assertEquals(expectedVals[valsToCheckIndex], collector.estimateCardinality(), 0.0d);
}

---

From source file:de.digitalcollections.streaming.euphoria.controller.StreamingController.java

/**
 * Stream the given input to the given output via NIO {@link Channels} and a directly allocated NIO
 * {@link ByteBuffer}. Both the input and output streams will implicitly be closed after streaming, regardless of
 * whether an exception is been thrown or not.
 *
 * @param input The input stream.//w  ww  . j a v a2 s  .c o m
 * @param output The output stream.
 * @return The length of the written bytes.
 * @throws IOException When an I/O error occurs.
 */
private long stream(InputStream input, OutputStream output) throws IOException {
    try (ReadableByteChannel inputChannel = Channels.newChannel(input);
            WritableByteChannel outputChannel = Channels.newChannel(output)) {
        ByteBuffer buffer = ByteBuffer.allocateDirect(DEFAULT_STREAM_BUFFER_SIZE);
        long size = 0;

        while (inputChannel.read(buffer) != -1) {
            buffer.flip();
            size += outputChannel.write(buffer);
            buffer.clear();
        }

        return size;
    }
}

---

From source file:org.alfresco.repo.content.AbstractWritableContentStoreTest.java

/**
 * Tests random access writing// www.j a v  a  2  s  .c o  m
 * <p>
 * Only executes if the writer implements {@link RandomAccessContent}.
 */
@Test
public void testRandomAccessWrite() throws Exception {
    ContentWriter writer = getWriter();

    FileChannel fileChannel = writer.getFileChannel(true);
    assertNotNull("No channel given", fileChannel);

    // check that no other content access is allowed
    try {
        writer.getWritableChannel();
        fail("Second channel access allowed");
    } catch (RuntimeException e) {
        // expected
    }

    // write some content in a random fashion (reverse order)
    byte[] content = new byte[] { 1, 2, 3 };
    for (int i = content.length - 1; i >= 0; i--) {
        ByteBuffer buffer = ByteBuffer.wrap(content, i, 1);
        fileChannel.write(buffer, i);
    }

    // close the channel
    fileChannel.close();
    assertTrue("Writer not closed", writer.isClosed());

    // check the content
    ContentReader reader = writer.getReader();
    ReadableByteChannel channelReader = reader.getReadableChannel();
    ByteBuffer buffer = ByteBuffer.allocateDirect(3);
    int count = channelReader.read(buffer);
    assertEquals("Incorrect number of bytes read", 3, count);
    for (int i = 0; i < content.length; i++) {
        assertEquals("Content doesn't match", content[i], buffer.get(i));
    }

    // get a new writer from the store, using the existing content and perform a truncation check
    ContentContext writerTruncateCtx = new ContentContext(writer.getReader(), null);
    ContentWriter writerTruncate = getStore().getWriter(writerTruncateCtx);
    assertEquals("Content size incorrect", 0, writerTruncate.getSize());
    // get the channel with truncation
    FileChannel fcTruncate = writerTruncate.getFileChannel(true);
    fcTruncate.close();
    assertEquals("Content not truncated", 0, writerTruncate.getSize());

    // get a new writer from the store, using the existing content and perform a non-truncation check
    ContentContext writerNoTruncateCtx = new ContentContext(writer.getReader(), null);
    ContentWriter writerNoTruncate = getStore().getWriter(writerNoTruncateCtx);
    assertEquals("Content size incorrect", 0, writerNoTruncate.getSize());
    // get the channel without truncation
    FileChannel fcNoTruncate = writerNoTruncate.getFileChannel(false);
    fcNoTruncate.close();
    assertEquals("Content was truncated", writer.getSize(), writerNoTruncate.getSize());
}

---

From source file:com.emc.ecs.smart.SmartUploader.java

private synchronized ByteBuffer getBuffer() {
    if (buffers.isEmpty()) {
        return ByteBuffer.allocateDirect(segmentSize);
    } else {/*  w  ww . j  a va2  s  .  c om*/
        return buffers.remove();
    }
}

---

From source file:org.alfresco.repo.transfer.HttpClientTransmitterImpl.java

private static void channelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(2 * 1024);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();// www  . j a v a  2  s  .co  m
        // write to the channel, may block
        dest.write(buffer);

        // If partial transfer, shift remainder down
        // If buffer is empty, same as doing clear()
        buffer.compact();
    }

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

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

---

From source file:org.gephi.desktop.importer.DesktopImportControllerUI.java

/**
 * Uncompress a Bzip2 file.//from ww  w  .j  a v  a2  s  .c om
 */
private static File getBzipFile(FileObject in, File out, boolean isTar) throws IOException {

    // Stream buffer
    final int BUFF_SIZE = 8192;
    final byte[] buffer = new byte[BUFF_SIZE];

    BZip2CompressorInputStream inputStream = null;
    FileOutputStream outStream = null;

    try {
        FileInputStream is = new FileInputStream(in.getPath());
        inputStream = new BZip2CompressorInputStream(is);
        outStream = new FileOutputStream(out.getAbsolutePath());

        if (isTar) {
            // Read Tar header
            int remainingBytes = readTarHeader(inputStream);

            // Read content
            ByteBuffer bb = ByteBuffer.allocateDirect(4 * BUFF_SIZE);
            byte[] tmpCache = new byte[BUFF_SIZE];
            int nRead, nGet;
            while ((nRead = inputStream.read(tmpCache)) != -1) {
                if (nRead == 0) {
                    continue;
                }
                bb.put(tmpCache);
                bb.position(0);
                bb.limit(nRead);
                while (bb.hasRemaining() && remainingBytes > 0) {
                    nGet = Math.min(bb.remaining(), BUFF_SIZE);
                    nGet = Math.min(nGet, remainingBytes);
                    bb.get(buffer, 0, nGet);
                    outStream.write(buffer, 0, nGet);
                    remainingBytes -= nGet;
                }
                bb.clear();
            }
        } else {
            int len;
            while ((len = inputStream.read(buffer)) > 0) {
                outStream.write(buffer, 0, len);
            }
        }
    } catch (IOException ex) {
        Exceptions.printStackTrace(ex);
    } finally {
        if (inputStream != null) {
            inputStream.close();
        }
        if (outStream != null) {
            outStream.close();
        }
    }

    return out;
}

---

From source file:com.aimfire.gallery.cardboard.PhotoActivity.java

/**
 * Draws a frame for an eye.//  w w  w  .  j a  v  a  2s.  c  om
 *
 * @param eye The eye to render. Includes all required transformations.
 */
@Override
public void onDrawEye(Eye eye) {
    if (mAssetInd == -1) {
        // we are still showing instruction, return without doing anything
        return;
    }

    if (!mAssetChangedLeft && !mAssetChangedRight) {
        // nothing changed, do nothing and return
        return;
    }

    if (eye.getType() == Eye.Type.LEFT)
        mAssetChangedLeft = false;
    else if (eye.getType() == Eye.Type.RIGHT)
        mAssetChangedRight = false;

    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
    checkGLError("mColorParam");

    GLES20.glUseProgram(mPicProgram);

    GLES20.glUniform1f(mDimRatioParam, mDimRatio);

    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    if (eye.getType() == Eye.Type.LEFT) {
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureCurr[0]);
    } else {
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureCurr[1]);
    }

    // set the zoom level
    GLES20.glUniform1f(mZoomParam, sZoom[mImgZoomInd]);

    /*
     * if user prefers negative parallax, shift window on left frame leftward and right frame
     * rightward. if user prefers positive parallax, do the opposite
     */
    if (eye.getType() == Eye.Type.LEFT) {
        GLES20.glUniform1f(mParallaxParam, mImgParallaxAdj / 2.0f);
    } else {
        GLES20.glUniform1f(mParallaxParam, -mImgParallaxAdj / 2.0f);
    }

    // Set the position of the picture
    //float zoomCoords[] = new float[picCoords.length];
    //for(int i=0; i<picCoords.length; i++)
    //zoomCoords[i] = picCoords[i] * zoom[zoomInd];

    //ByteBuffer bblVertices = ByteBuffer.allocateDirect(zoomCoords.length * 4);
    ByteBuffer bblVertices = ByteBuffer.allocateDirect(picCoords.length * 4);
    bblVertices.order(ByteOrder.nativeOrder());
    mPicVertices = bblVertices.asFloatBuffer();
    //mPicVertices.put(zoomCoords);
    mPicVertices.put(picCoords);
    mPicVertices.position(0);

    GLES20.glVertexAttribPointer(mPicPositionParam, COORDS_PER_VERTEX, GLES20.GL_FLOAT, false, vertexStride,
            mPicVertices);

    GLES20.glDrawElements(GLES20.GL_TRIANGLES, /* mode */
            6, /* count */
            GLES20.GL_UNSIGNED_SHORT, /* type */
            mPicElements /* element array buffer offset */
    );
}

---

From source file:org.gephi.desktop.importer.DesktopImportControllerUI.java

/**
 * Uncompress a GZIP file./*from  w  w w  .j a v a  2s . c om*/
 */
private static File getGzFile(FileObject in, File out, boolean isTar) throws IOException {

    // Stream buffer
    final int BUFF_SIZE = 8192;
    final byte[] buffer = new byte[BUFF_SIZE];

    GZIPInputStream inputStream = null;
    FileOutputStream outStream = null;

    try {
        inputStream = new GZIPInputStream(new FileInputStream(in.getPath()));
        outStream = new FileOutputStream(out);

        if (isTar) {
            // Read Tar header
            int remainingBytes = readTarHeader(inputStream);

            // Read content
            ByteBuffer bb = ByteBuffer.allocateDirect(4 * BUFF_SIZE);
            byte[] tmpCache = new byte[BUFF_SIZE];
            int nRead, nGet;
            while ((nRead = inputStream.read(tmpCache)) != -1) {
                if (nRead == 0) {
                    continue;
                }
                bb.put(tmpCache);
                bb.position(0);
                bb.limit(nRead);
                while (bb.hasRemaining() && remainingBytes > 0) {
                    nGet = Math.min(bb.remaining(), BUFF_SIZE);
                    nGet = Math.min(nGet, remainingBytes);
                    bb.get(buffer, 0, nGet);
                    outStream.write(buffer, 0, nGet);
                    remainingBytes -= nGet;
                }
                bb.clear();
            }
        } else {
            int len;
            while ((len = inputStream.read(buffer)) > 0) {
                outStream.write(buffer, 0, len);
            }
        }
    } catch (IOException ex) {
        Exceptions.printStackTrace(ex);
    } finally {
        if (inputStream != null) {
            inputStream.close();
        }
        if (outStream != null) {
            outStream.close();
        }
    }

    return out;
}

---

From source file:com.ibm.crail.tools.CrailBenchmark.java

void early(String filename) throws Exception {
    ByteBuffer buf = ByteBuffer.allocateDirect(32);
    CrailFile file = fs// w ww.ja  v  a2s.  c  o  m
            .create(filename, CrailNodeType.DATAFILE, CrailStorageClass.DEFAULT, CrailLocationClass.DEFAULT)
            .early().asFile();
    CrailBufferedOutputStream stream = file.getBufferedOutputStream(0);
    System.out.println("buffered stream initialized");

    Thread.sleep(1000);
    stream.write(buf);
    System.out.println("buffered stream written");

    Thread.sleep(1000);
    stream.write(buf);
    System.out.println("buffered stream written");

    stream.purge();
    stream.close();

    System.out.println("buffered stream closed");

    fs.getStatistics().print("close");
}

---

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