Example usage for java.io RandomAccessFile getChannel

Introduction

In this page you can find the example usage for java.io RandomAccessFile getChannel.

Prototype

public final FileChannel getChannel() 

Source Link

Document

Returns the unique java.nio.channels.FileChannel FileChannel object associated with this file.

Usage

From source file:org.apache.tajo.pullserver.HttpDataServerHandler.java

private ChannelFuture sendFile(ChannelHandlerContext ctx, FileChunk file) throws IOException {
    RandomAccessFile raf;
    try {// www.  j a v  a2 s  .  c o m
        raf = new RandomAccessFile(file.getFile(), "r");
    } catch (FileNotFoundException fnfe) {
        return null;
    }

    ChannelFuture writeFuture;
    ChannelFuture lastContentFuture;
    if (ctx.pipeline().get(SslHandler.class) != null) {
        // Cannot use zero-copy with HTTPS.
        lastContentFuture = ctx
                .write(new HttpChunkedInput(new ChunkedFile(raf, file.startOffset(), file.length(), 8192)));
    } else {
        // No encryption - use zero-copy.
        final FileRegion region = new DefaultFileRegion(raf.getChannel(), file.startOffset(), file.length());
        writeFuture = ctx.write(region);
        lastContentFuture = ctx.write(LastHttpContent.EMPTY_LAST_CONTENT);
        writeFuture.addListener(new ChannelFutureListener() {
            public void operationComplete(ChannelFuture future) {
                if (region.refCnt() > 0) {
                    region.release();
                }
            }
        });
    }

    return lastContentFuture;
}

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From source file:interactivespaces.liveactivity.runtime.standalone.development.DevelopmentStandaloneLiveActivityRuntime.java

/**
 * Get the instance suffix to use for this instance. The suffix returned depends on the number of already running
 * instances./*from  ww  w  .j  a  v a 2  s .co  m*/
 *
 * @param rootDir
 *          the root directory that holds the instance locks
 *
 * @return suffix to use for directories and files
 */
private String findInstanceSuffix(File rootDir) {
    if (instanceSuffix != null) {
        return instanceSuffix;
    }

    int instance = 0;
    while (instance < MAX_INSTANCE_COUNT) {
        String suffix = instance > 0 ? ("-" + instance) : "";
        File lockFile = new File(rootDir, LOCK_FILE_NAME + suffix);
        try {
            RandomAccessFile pidRaf = new RandomAccessFile(lockFile, "rw");
            FileLock fileLock = pidRaf.getChannel().tryLock(0, Long.MAX_VALUE, false);
            if (fileLock != null) {
                return suffix;
            }
        } catch (IOException e) {
            // Do nothing, increment and try again.
        }
        instance++;
    }
    throw new InteractiveSpacesException("Could not lock run file after " + MAX_INSTANCE_COUNT + " tries");
}

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From source file:io.pcp.parfait.dxm.FileByteBufferFactory.java

public ByteBuffer build(int length) throws IOException {
    RandomAccessFile fos = null;
    try {//w w w.  j  ava2s.  co  m
        File parent = file.getParentFile();
        if (parent == null) {
            throw new RuntimeException("Could not find parent of output file " + file.getCanonicalPath());
        } else if (parent.exists()) {
            file.delete(); /* directory update visible to MMV PMDA */
            if (file.exists()) {
                throw new RuntimeException("Could not delete existing file " + file.getCanonicalPath());
            }
        } else if (!parent.mkdirs()) {
            throw new RuntimeException("Could not create output directory " + parent.getCanonicalPath());
        }
        fos = new RandomAccessFile(file, "rw");
        fos.setLength(length);
        ByteBuffer tempDataFile = fos.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, length);
        tempDataFile.order(ByteOrder.nativeOrder());
        fos.close();

        return tempDataFile;
    } finally {
        if (fos != null) {
            fos.close();
        }
    }
}

---

From source file:org.fuin.utils4j.Utils4J.java

/**
 * Lock the file./*from   w  w w.  j av  a  2  s  . c om*/
 * 
 * @param file
 *            File to lock - Cannot be <code>null</code>.
 * @param tryLockMax
 *            Number of tries to lock before throwing an exception.
 * @param tryWaitMillis
 *            Milliseconds to sleep between retries.
 * 
 * @return FileLock.
 * 
 * @throws LockingFailedException
 *             Locking the file failed.
 */
public static FileLock lockRandomAccessFile(final RandomAccessFile file, final int tryLockMax,
        final long tryWaitMillis) throws LockingFailedException {

    checkNotNull("file", file);

    final FileChannel channel = file.getChannel();

    int tryCount = 0;
    while (tryCount < tryLockMax) {
        tryCount++;
        try {
            final FileLock lock = channel.tryLock();
            if (lock != null) {
                return lock;
            }
        } catch (final IOException ex) {
            throw new LockingFailedException("Unexpected I/O-Exception!", ex);
        } catch (final OverlappingFileLockException ex) {
            ignore();
        }
        try {
            Thread.sleep(tryWaitMillis);
        } catch (final InterruptedException ex) {
            throw new LockingFailedException("Unexpected interrupt!", ex);
        }
    }
    throw new LockingFailedException("Number of max tries (" + tryLockMax + ") exceeded!");

}

---

From source file:org.oscarehr.document.web.ManageDocumentAction.java

public File createCacheVersion(Document d, int pageNum) throws Exception {

    File documentCacheDir = new File(EDocUtil.getCacheDirectory());
    File file = new File(EDocUtil.getDocumentPath(d.getDocfilename()));

    RandomAccessFile raf = new RandomAccessFile(file, "r");
    FileChannel channel = raf.getChannel();
    ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
    PDFFile pdffile = new PDFFile(buf);
    if (raf != null)
        raf.close();//  w w w. j  a  va  2  s  .c  o m
    if (channel != null)
        channel.close();
    // draw the first page to an image
    PDFPage ppage = pdffile.getPage(pageNum);

    log.debug("WIDTH " + (int) ppage.getBBox().getWidth() + " height " + (int) ppage.getBBox().getHeight());

    // get the width and height for the doc at the default zoom
    Rectangle rect = new Rectangle(0, 0, (int) ppage.getBBox().getWidth(), (int) ppage.getBBox().getHeight());

    log.debug("generate the image");
    Image img = ppage.getImage(rect.width, rect.height, // width & height
            rect, // clip rect
            null, // null for the ImageObserver
            true, // fill background with white
            true // block until drawing is done
    );

    log.debug("about to Print to stream");
    File outfile = new File(documentCacheDir, d.getDocfilename() + "_" + pageNum + ".png");

    OutputStream outs = null;
    try {
        outs = new FileOutputStream(outfile);

        RenderedImage rendImage = (RenderedImage) img;
        ImageIO.write(rendImage, "png", outs);
        outs.flush();
    } finally {
        if (outs != null)
            outs.close();
    }
    return outfile;

}

---

From source file:org.oscarehr.document.web.ManageDocumentAction.java

public ActionForward view2(ActionMapping mapping, ActionForm form, HttpServletRequest request,
        HttpServletResponse response) throws Exception {

    // TODO: NEED TO CHECK FOR ACCESS
    String doc_no = request.getParameter("doc_no");
    log.debug("Document No :" + doc_no);

    LogAction.addLog((String) request.getSession().getAttribute("user"), LogConst.READ, LogConst.CON_DOCUMENT,
            doc_no, request.getRemoteAddr());

    Document d = documentDAO.getDocument(doc_no);
    log.debug("Document Name :" + d.getDocfilename());

    // TODO: Right now this assumes it's a pdf which it shouldn't

    response.setContentType("image/png");
    // response.setHeader("Content-Disposition", "attachment;filename=\"" + filename+ "\"");
    // read the file name.
    File file = new File(EDocUtil.getDocumentPath(d.getDocfilename()));

    RandomAccessFile raf = new RandomAccessFile(file, "r");
    FileChannel channel = raf.getChannel();
    ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
    PDFFile pdffile = new PDFFile(buf);
    // draw the first page to an image
    PDFPage ppage = pdffile.getPage(0);/*w ww  . j a v  a 2s.  c  o m*/

    log.debug("WIDTH " + (int) ppage.getBBox().getWidth() + " height " + (int) ppage.getBBox().getHeight());

    // get the width and height for the doc at the default zoom
    Rectangle rect = new Rectangle(0, 0, (int) ppage.getBBox().getWidth(), (int) ppage.getBBox().getHeight());

    log.debug("generate the image");
    Image img = ppage.getImage(rect.width, rect.height, // width & height
            rect, // clip rect
            null, // null for the ImageObserver
            true, // fill background with white
            true // block until drawing is done
    );

    log.debug("about to Print to stream");
    ServletOutputStream outs = response.getOutputStream();

    RenderedImage rendImage = (RenderedImage) img;
    ImageIO.write(rendImage, "png", outs);
    outs.flush();
    outs.close();
    return null;
}

---

From source file:tachyon.worker.WorkerStorage.java

/**
 * Swap out those blocks missing INode information onto underFS which can be retrieved by user
 * later. Its cleanup only happens while formating the mTachyonFS.
 *//*www . ja  v  a  2  s .c o  m*/
private void swapoutOrphanBlocks(long blockId, File file) throws IOException {
    RandomAccessFile localFile = new RandomAccessFile(file, "r");
    ByteBuffer buf = localFile.getChannel().map(MapMode.READ_ONLY, 0, file.length());

    String ufsOrphanBlock = CommonUtils.concat(mUfsOrphansFolder, blockId);
    OutputStream os = mUfs.create(ufsOrphanBlock);
    final int bulkSize = Constants.KB * 64;
    byte[] bulk = new byte[bulkSize];
    for (int k = 0; k < (buf.limit() + bulkSize - 1) / bulkSize; k++) {
        int len = bulkSize < buf.remaining() ? bulkSize : buf.remaining();
        buf.get(bulk, 0, len);
        os.write(bulk, 0, len);
    }
    os.close();

    localFile.close();
}

---

From source file:ro.ieugen.fileserver.http.HttpStaticFileServerHandler.java

@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
    HttpRequest request = (HttpRequest) e.getMessage();

    final String path = sanitizeUri(request.getUri());
    LOG.info("Requested URI is {}, sanitised path is {}", request.getUri(), path);
    if (path == null) {
        sendError(ctx, FORBIDDEN);/*w w  w  . j av  a 2  s.c o  m*/
        return;
    }

    File file = new File(path);
    if (file.isHidden() || !file.exists()) {
        sendError(ctx, NOT_FOUND);
        return;
    }

    if (!(file.isFile() || file.isDirectory())) {
        sendError(ctx, FORBIDDEN);
        return;
    }

    Channel ch = e.getChannel();
    ChannelFuture writeFuture = null;

    if (file.isDirectory()) {
        ch.write(directoryListingResponse(file));
    } else {
        // Cache Validation
        if (sendRetrieveFromCacheIfNotModified(ctx, request, file))
            return;
        RandomAccessFile raf = openFileOrSendError(ctx, file);
        if (raf == null)
            return;
        // Write the initial line and the header.
        ch.write(fileDownloadResponse(file, raf));

        // Write the content.
        if (ch.getPipeline().get(SslHandler.class) != null) {
            // Cannot use zero-copy with HTTPS.
            writeFuture = ch.write(new ChunkedFile(raf, 0, raf.length(), 8192));
        } else {
            // No encryption - use zero-copy.
            final FileRegion region = new DefaultFileRegion(raf.getChannel(), 0, raf.length());
            writeFuture = ch.write(region);
            writeFuture.addListener(new ChannelFutureProgressListener() {
                public void operationComplete(ChannelFuture future) {
                    region.releaseExternalResources();
                }

                public void operationProgressed(ChannelFuture future, long amount, long current, long total) {
                    LOG.info("{}", String.format("%s: %d / %d (+%d)%n", path, current, total, amount));
                }
            });
        }
    }

    // Decide whether to close the connection or not.
    if (!isKeepAlive(request)) {
        // Close the connection when the whole content is written out.
        writeFuture.addListener(ChannelFutureListener.CLOSE);
    }
}

---

From source file:org.openspaces.pu.container.jee.jetty.support.FileLockFreePortGenerator.java

public PortHandle nextAvailablePort(int startFromPort, int retryCount) {
    int portNumber = -1;
    FileLock portFileLock = null;
    RandomAccessFile portFile = null;
    for (int i = 0; i < retryCount; i++) {
        portNumber = startFromPort + i;/* www  .  j ava 2s  . c om*/
        File portF = new File(portDirectory, portNumber + ".port");
        try {
            portFile = new RandomAccessFile(portF, "rw");
        } catch (FileNotFoundException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to open port marker file [" + portF.getAbsolutePath() + "]", e);
            }
            // can't get this one, continue
            continue;
        }
        try {
            if (logger.isDebugEnabled()) {
                logger.debug("Trying to lock file [" + portF.getAbsolutePath() + "]");
            }
            portFileLock = portFile.getChannel().tryLock();
            if (portFileLock == null) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Can't get lock for [" + portF.getAbsolutePath() + "], try another");
                }
                try {
                    portFile.close();
                } catch (Exception e) {
                    // ignore
                }
                continue;
            }
        } catch (OverlappingFileLockException e) {
            if (logger.isDebugEnabled()) {
                logger.debug(
                        "Can't get lock for [" + portF.getAbsolutePath() + "], try another, " + e.getMessage());
            }
            try {
                portFile.close();
            } catch (Exception e1) {
                // ignore
            }
            // failed to get the lock, continue
            continue;
        } catch (IOException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to get lock file for [" + portF.getAbsolutePath() + "]", e);
            }
            try {
                portFile.close();
            } catch (Exception e1) {
                // ignore
            }
            // failed to get the lock, continue
            continue;
        }
        // all is well, break
        break;
    }
    if (portFileLock == null) {
        throw new IllegalStateException("Failed to acquire port file lock, tried for [" + retryCount
                + "], basePort [" + startFromPort + "]");
    }
    return new FileLockPortHandle(portFile, portFileLock, portNumber);
}

---

From source file:org.commoncrawl.service.crawler.CrawlLog.java

private static void updateLogFileHeader(File logFileName, LogFileHeader header, long addedRecordCount)
        throws IOException {

    RandomAccessFile file = new RandomAccessFile(logFileName, "rw");

    try {//from w ww.j  a v  a 2 s .  c o m

        // update cached header ...
        header._fileSize = file.getChannel().size();
        header._itemCount += addedRecordCount;
        // set the position at zero ..
        file.seek(0);
        // and write header to disk ...
        header.writeHeader(file);
    } finally {
        // major bottle neck..
        // file.getFD().sync();
        file.close();
    }
}

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