Example usage for java.nio.channels FileChannel map

List of usage examples for java.nio.channels FileChannel map

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Introduction

In this page you can find the example usage for java.nio.channels FileChannel map.

Prototype

public abstract MappedByteBuffer map(MapMode mode, long position, long size) throws IOException;

Source Link

Document

Maps a region of this channel's file directly into memory.

Usage

From source file:org.grouplens.lenskit.data.dao.packed.BinaryIndexTableTest.java

@Test
public void testLimitedView() throws IOException {
    File file = folder.newFile();
    FileChannel chan = new RandomAccessFile(file, "rw").getChannel();
    BinaryIndexTableWriter writer = BinaryIndexTableWriter.create(BinaryFormat.create(), chan, 3);
    writer.writeEntry(12, new int[] { 0 });
    writer.writeEntry(17, new int[] { 1, 3 });
    writer.writeEntry(19, new int[] { 4, 5 });

    MappedByteBuffer buffer = chan.map(FileChannel.MapMode.READ_ONLY, 0, chan.size());
    BinaryIndexTable tbl = BinaryIndexTable.fromBuffer(3, buffer);
    tbl = tbl.createLimitedView(2);/*w ww .java2 s  .  c om*/
    assertThat(tbl.getKeys(), hasSize(2));
    assertThat(tbl.getKeys(), contains(12L, 17L));
    assertThat(tbl.getEntry(12), contains(0));
    assertThat(tbl.getEntry(17), contains(1));
    assertThat(tbl.getEntry(19), nullValue());
    assertThat(tbl.getEntry(-1), nullValue());

    BinaryIndexTable serializedTbl = SerializationUtils.clone(tbl);
    assertThat(serializedTbl.getKeys(), hasSize(2));
    assertThat(serializedTbl.getKeys(), contains(12L, 17L));
    assertThat(serializedTbl.getEntry(12), contains(0));
    assertThat(serializedTbl.getEntry(17), contains(1));
    assertThat(serializedTbl.getEntry(19), nullValue());
    assertThat(serializedTbl.getEntry(-1), nullValue());
}

From source file:org.opennms.systemreport.AbstractSystemReportPlugin.java

protected String slurp(final File lsb) {
    if (lsb != null && lsb.exists()) {
        FileInputStream stream = null;
        try {/*ww w. j a v a  2 s  . c  om*/
            stream = new FileInputStream(lsb);
            FileChannel fc = stream.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            return Charset.defaultCharset().decode(bb).toString().replace("[\\r\\n]*$", "");
        } catch (final Exception e) {
            LOG.debug("Unable to read from file '{}'", lsb.getPath(), e);
        } finally {
            IOUtils.closeQuietly(stream);
        }
    }
    return null;
}

From source file:org.ednovo.gooru.application.util.ResourceProcessor.java

public void postPdfUpdate(final String resourceGooruOid) throws Exception {

    new TransactionBox() {

        @Override/*from  w w  w  . j  av a 2s  .c  om*/
        public void execute() {

            try {

                logger.info("Updating Resource: " + resourceGooruOid);
                Resource resource = resourceRepository.findResourceByContentGooruId(resourceGooruOid);
                String repoPath = resource.getOrganization().getNfsStorageArea().getInternalPath()
                        + resource.getFolder();
                /*
                 * getGooruImageUtil().scaleImage(repoPath +
                 * resource.getThumbnail(), repoPath, null,
                 * ResourceImageUtil.RESOURCE_THUMBNAIL_SIZES);
                 */
                ResourceInfo resourceInfo = resourceRepository.findResourceInfo(resource.getGooruOid());
                if (resourceInfo == null) {
                    resourceInfo = new ResourceInfo();
                    resourceInfo.setResource(resource);
                }

                resourceInfo.setLastUpdated(new Date());

                RandomAccessFile raf = new RandomAccessFile(new File(repoPath + resource.getUrl()), "r");
                FileChannel channel = raf.getChannel();
                ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
                PDFFile pdffile = new PDFFile(buf);
                resourceInfo.setNumOfPages(pdffile.getNumPages());

                resourceRepository.save(resourceInfo);
                resource.setResourceInfo(resourceInfo);
                resourceRepository.save(resource);

                s3ResourceApiHandler.uploadResourceFolder(resource);

            } catch (Exception ex) {
                logger.error("Error while generating thumbnail ", ex);
                s3ResourceApiHandler.uploadResourceFolderWithNewSession(resourceGooruOid);
            }
        }
    };
}

From source file:com.amaze.filemanager.utils.files.GenericCopyUtil.java

private void copyFile(BufferedInputStream bufferedInputStream, FileChannel outChannel) throws IOException {

    MappedByteBuffer byteBuffer = outChannel.map(FileChannel.MapMode.READ_WRITE, 0, mSourceFile.getSize());
    int count = 0;
    byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
    while (count != -1) {

        count = bufferedInputStream.read(buffer);
        if (count != -1 && !progressHandler.getCancelled()) {

            byteBuffer.put(buffer, 0, count);
            ServiceWatcherUtil.position += count;
        } else//from  ww  w .  ja v  a  2s.c o  m
            break;
    }
}

From source file:com.wwpass.connection.WWPassConnection.java

private static PKCS8EncodedKeySpec readKeyFile(String path) throws IOException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {/*from  w  w  w .j  a v a  2  s  .c om*/
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        String pem = Charset.defaultCharset().decode(bb).toString();
        pem = pem.replaceFirst("-----BEGIN (RSA )?PRIVATE KEY-----\r?\n?", "")
                .replace("-----END (RSA )?PRIVATE KEY-----", "");
        Base64 dec1 = new Base64();
        byte[] encoded = dec1.decode(pem);
        return new PKCS8EncodedKeySpec(encoded);
    } finally {
        stream.close();
    }
}

From source file:esg.node.components.monitoring.MonitorDAO.java

private void loadDiskInfoResource() {
    disk_info_dsroot_pat = Pattern.compile("thredds_dataset_roots\\s*=\\s*(.*?)\\s*\\w+\\s*?=");
    disk_info_dsroot_keyval_pat = Pattern.compile("\\s*(\\w+)\\s*\\|\\s*(\\S+)\\s*");

    String filename = props.getProperty("monitor.esg.ini",
            System.getenv().get("ESG_USER_HOME") + "/.esgcet/esg.ini");
    File iniFile = new File(filename);
    if (!iniFile.exists()) {
        log.warn("ESG publisher config file [" + filename + "] not found! Cannot provide disk info!");
        return;/*from  w  ww  . jav a2 s  .  co  m*/
    }

    log.debug("Scanning for drives specified in: " + filename);

    try {
        FileInputStream fis = new FileInputStream(iniFile);
        FileChannel fc = fis.getChannel();
        disk_info_byte_buffer = fc.map(FileChannel.MapMode.READ_ONLY, 0, (int) fc.size());
    } catch (FileNotFoundException e) {
        log.error(e);
    } catch (IOException e) {
        log.error(e);
    }
}

From source file:com.amaze.filemanager.utils.files.GenericCopyUtil.java

private void copyFile(FileChannel inChannel, BufferedOutputStream bufferedOutputStream) throws IOException {
    MappedByteBuffer inBuffer = inChannel.map(FileChannel.MapMode.READ_ONLY, 0, mSourceFile.getSize());

    int count = -1;
    byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
    try {/*from   w  ww.j  ava2 s .c o  m*/
        while (inBuffer.hasRemaining() && count != 0) {

            int tempPosition = inBuffer.position();

            try {

                // try normal way of getting bytes
                ByteBuffer tempByteBuffer = inBuffer.get(buffer);
                count = tempByteBuffer.position() - tempPosition;
            } catch (BufferUnderflowException exception) {
                exception.printStackTrace();

                // not enough bytes left in the channel to read, iterate over each byte and store
                // in the buffer

                // reset the counter bytes
                count = 0;
                for (int i = 0; i < buffer.length && inBuffer.hasRemaining(); i++) {
                    buffer[i] = inBuffer.get();
                    count++;
                }
            }

            if (count != -1 && !progressHandler.getCancelled()) {

                bufferedOutputStream.write(buffer, 0, count);
                ServiceWatcherUtil.position = inBuffer.position();
            } else
                break;

        }
    } finally {
        bufferedOutputStream.flush();
    }
}

From source file:com.topsem.common.net.IPSeeker.java

public IPSeeker(File ipFile) throws Exception {
    this.ipFile = new RandomAccessFile(ipFile, "r");
    ipCache = new HashMap<String, IPLocation>();
    FileChannel fc = this.ipFile.getChannel();
    mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, ipFile.length());
    mbb.order(ByteOrder.LITTLE_ENDIAN);
    ipBegin = readInt(0);/*from   ww  w.j av a2  s.  c om*/
    ipEnd = readInt(4);
    if (ipBegin == -1 || ipEnd == -1) {
        throw new IOException("IP???IP");
    }
    log.debug("IP?:" + ipFile.getAbsolutePath());
}

From source file:org.lic.ip.ipseeker.IPSeeker.java

/**
 * ?/*from  www  . ja v a2  s. c om*/
 */
private IPSeeker() {
    tmpBuf = new byte[100];
    tmpB4 = new byte[4];

    try {
        String filepath = getClass().getClassLoader().getResource("qqwry.dat").getPath();
        ipFile = new RandomAccessFile(filepath, "r");
        // ipFile = new RandomAccessFile(ClassLoader.getSystemResource(
        // ip_filename).getPath(), "r");
    } catch (IOException e) {
        logger.error("IP??IP");
        return;
    }

    if (ipFile == null)
        return;

    // ??
    try {
        ipBegin = readInt4(0);
        ipEnd = readInt4(4);
        if (ipBegin == -1 || ipEnd == -1) {
            ipFile.close();
            ipFile = null;
            return;
        }
    } catch (IOException e) {
        logger.error("IP???IP");
        ipFile = null;
        return;
    }

    // IP?
    try {
        FileChannel fc = ipFile.getChannel();
        long ipFileLen = ipFile.length();
        mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, ipFileLen);
        mbb.order(ByteOrder.LITTLE_ENDIAN);
        ipFile.close();

        logger.info("read ip file to memory, len = " + ipFileLen + " bytes");
    } catch (IOException e) {
        e.printStackTrace();
    }
}