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:com.owncloud.android.lib.common.network.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;/*from  www  .  j a  va2 s  . c  om*/
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getAbsolutePath());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

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From source file:com.cerema.cloud2.lib.common.network.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;//  ww w  . j a v  a 2 s  .c o m
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getAbsolutePath());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

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From source file:com.turn.ttorrent.client.TorrentByteStorage.java

/** Move the partial file to its final location.
 *
 * <p>//from www  . j  av a 2s.c o m
 * This method needs to make sure reads can still happen seemlessly during
 * the operation. The partial is first flushed to the storage device before
 * being copied to its target location. The {@link FileChannel} is then
 * switched to this new file before the partial is removed.
 * </p>
 */
public synchronized void complete() throws IOException {
    this.channel.force(true);

    // Nothing more to do if we're already on the target file.
    if (this.current.equals(this.target)) {
        return;
    }

    FileUtils.deleteQuietly(this.target);
    FileUtils.copyFile(this.current, this.target);

    logger.debug("Re-opening torrent byte storage at " + this.target.getAbsolutePath() + ".");

    RandomAccessFile raf = new RandomAccessFile(this.target, "rw");
    raf.setLength(this.size);

    this.channel = raf.getChannel();
    this.raf.close();
    this.raf = raf;
    this.current = this.target;

    FileUtils.deleteQuietly(this.partial);
}

---

From source file:it.doqui.index.ecmengine.business.personalization.multirepository.FileContentWriterDynamic.java

@Override
protected WritableByteChannel getDirectWritableChannel() throws ContentIOException {
    try {/*  w w w. jav  a2 s .  c om*/
        // we may not write to an existing file - EVER!!
        if (file.exists() && file.length() > 0) {
            throw new IOException("File exists - overwriting not allowed");
        }
        // create the channel
        WritableByteChannel channel = null;
        if (allowRandomAccess) {
            RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw"); // will create it
            channel = randomAccessFile.getChannel();
        } else {
            OutputStream os = new FileOutputStream(file);
            channel = Channels.newChannel(os);
        }
        // done
        if (logger.isDebugEnabled()) {
            logger.debug("Opened write channel to file: \n" + "   file: " + file + "\n" + "   random-access: "
                    + allowRandomAccess);
        }
        return channel;
    } catch (Throwable e) {
        throw new ContentIOException("Failed to open file channel: " + this, e);
    }
}

---

From source file:com.owncloud.android.operations.ChunkedUploadFileOperation.java

@Override
protected int uploadFile(WebdavClient client) throws HttpException, IOException {
    int status = -1;

    FileChannel channel = null;//from   www.  j a  v  a 2s  .c om
    RandomAccessFile raf = null;
    try {
        File file = new File(getStoragePath());
        raf = new RandomAccessFile(file, "r");
        channel = raf.getChannel();
        mEntity = new ChunkFromFileChannelRequestEntity(channel, getMimeType(), CHUNK_SIZE, file);
        ((ProgressiveDataTransferer) mEntity).addDatatransferProgressListeners(getDataTransferListeners());
        long offset = 0;
        String uriPrefix = client.getBaseUri() + WebdavUtils.encodePath(getRemotePath()) + "-chunking-"
                + Math.abs((new Random()).nextInt(9000) + 1000) + "-";
        long chunkCount = (long) Math.ceil((double) file.length() / CHUNK_SIZE);
        for (int chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++, offset += CHUNK_SIZE) {
            if (mPutMethod != null) {
                mPutMethod.releaseConnection(); // let the connection available for other methods
            }
            mPutMethod = new PutMethod(uriPrefix + chunkCount + "-" + chunkIndex);
            mPutMethod.addRequestHeader(OC_CHUNKED_HEADER, OC_CHUNKED_HEADER);
            ((ChunkFromFileChannelRequestEntity) mEntity).setOffset(offset);
            mPutMethod.setRequestEntity(mEntity);
            status = client.executeMethod(mPutMethod);
            client.exhaustResponse(mPutMethod.getResponseBodyAsStream());
            Log_OC.d(TAG, "Upload of " + getStoragePath() + " to " + getRemotePath() + ", chunk index "
                    + chunkIndex + ", count " + chunkCount + ", HTTP result status " + status);
            if (!isSuccess(status))
                break;
        }

    } finally {
        if (channel != null)
            channel.close();
        if (raf != null)
            raf.close();
        if (mPutMethod != null)
            mPutMethod.releaseConnection(); // let the connection available for other methods
    }
    return status;
}

---

From source file:com.owncloud.android.lib.resources.files.ChunkedUploadRemoteFileOperation.java

@Override
protected int uploadFile(OwnCloudClient client) throws HttpException, IOException {
    int status = -1;

    FileChannel channel = null;/*  w  ww.  j  a  v a 2  s.c o  m*/
    RandomAccessFile raf = null;
    try {
        File file = new File(mLocalPath);
        raf = new RandomAccessFile(file, "r");
        channel = raf.getChannel();
        mEntity = new ChunkFromFileChannelRequestEntity(channel, mMimeType, CHUNK_SIZE, file);
        //((ProgressiveDataTransferer)mEntity).addDatatransferProgressListeners(getDataTransferListeners());
        synchronized (mDataTransferListeners) {
            ((ProgressiveDataTransferer) mEntity).addDatatransferProgressListeners(mDataTransferListeners);
        }

        long offset = 0;
        String uriPrefix = client.getWebdavUri() + WebdavUtils.encodePath(mRemotePath) + "-chunking-"
                + Math.abs((new Random()).nextInt(9000) + 1000) + "-";
        long chunkCount = (long) Math.ceil((double) file.length() / CHUNK_SIZE);
        for (int chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++, offset += CHUNK_SIZE) {
            if (mPutMethod != null) {
                mPutMethod.releaseConnection(); // let the connection available for other methods
            }
            mPutMethod = new PutMethod(uriPrefix + chunkCount + "-" + chunkIndex);
            mPutMethod.addRequestHeader(OC_CHUNKED_HEADER, OC_CHUNKED_HEADER);
            ((ChunkFromFileChannelRequestEntity) mEntity).setOffset(offset);
            mPutMethod.setRequestEntity(mEntity);
            status = client.executeMethod(mPutMethod);
            client.exhaustResponse(mPutMethod.getResponseBodyAsStream());
            Log_OC.d(TAG, "Upload of " + mLocalPath + " to " + mRemotePath + ", chunk index " + chunkIndex
                    + ", count " + chunkCount + ", HTTP result status " + status);
            if (!isSuccess(status))
                break;
        }

    } finally {
        if (channel != null)
            channel.close();
        if (raf != null)
            raf.close();
        if (mPutMethod != null)
            mPutMethod.releaseConnection(); // let the connection available for other methods
    }
    return status;
}

---

From source file:com.linkedin.pinot.common.utils.MmapUtils.java

/**
 * Memory maps a file, tracking usage information.
 *
 * @param randomAccessFile The random access file to mmap
 * @param mode The mmap mode//from  w w w .  ja v  a 2s .  com
 * @param position The byte position to mmap
 * @param size The number of bytes to mmap
 * @param file The file that is mmap'ed
 * @param details Additional details about the allocation
 */
public static MappedByteBuffer mmapFile(RandomAccessFile randomAccessFile, FileChannel.MapMode mode,
        long position, long size, File file, String details) throws IOException {
    final String context;
    final AllocationContext allocationContext;

    if (file != null) {
        context = file.getAbsolutePath() + " (" + details + ")";
        allocationContext = new AllocationContext(file, details, AllocationType.MMAP);
    } else {
        context = "no file (" + details + ")";
        allocationContext = new AllocationContext(details, AllocationType.MMAP);
    }

    MMAP_BUFFER_USAGE.addAndGet(size);

    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug("Memory mapping file, mmap size {} with context {}, allocation after operation {}", size,
                context, getTrackedAllocationStatus());
    }

    MappedByteBuffer byteBuffer = null;

    try {
        byteBuffer = randomAccessFile.getChannel().map(mode, position, size);
        MMAP_BUFFER_COUNT.incrementAndGet();
    } catch (Exception e) {
        LOGGER.error("Failed to mmap file (size {}, context {})", size, context, e);
        LOGGER.error("Allocation status {}", getTrackedAllocationStatus());
        Utils.rethrowException(e);
    }

    BUFFER_TO_CONTEXT_MAP.put(byteBuffer, allocationContext);

    return byteBuffer;
}

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From source file:org.apache.hadoop.mapreduce.task.reduce.InMemoryLinkMapOutput.java

@Override
public void shuffle(MapHost host, InputStream input, long compressedLength, long decompressedLength,
        ShuffleClientMetrics metrics, Reporter reporter) throws IOException {

    String mapHostName = host.getHostName().split(":")[0];
    String app_path = conf.get(MRConfig.LOCAL_DIR);
    LOG.debug("original app_path " + app_path);
    String[] app_path_parts = app_path.split("/");
    app_path_parts[app_path_parts.length - 5] = mapHostName;
    StringBuilder builder = new StringBuilder();
    for (String s : app_path_parts) {
        builder.append(s);// w ww  .  ja  v a2  s  . c om
        builder.append("/");
    }
    app_path = builder.toString();
    String src = app_path + "output/" + getMapId() + "/file.out";

    File f = new File(src);
    if (f.exists()) {
        LOG.debug("shuffleToLink: the src " + src + " EXIST!");
    }

    //LOG.debug("src file size: "+f.length());

    //input = new FileInputStream(src);
    //input.skip(offset);

    RandomAccessFile raf = new RandomAccessFile(f, "r");
    input = Channels.newInputStream(raf.getChannel().position(offset));

    IFileInputStream checksumIn = new IFileInputStream(input, compressedLength, conf);

    input = checksumIn;

    // Are map-outputs compressed?
    if (codec != null) {
        decompressor.reset();
        input = codec.createInputStream(input, decompressor);
    }

    try {
        LOG.debug("offset: " + offset);
        LOG.debug("memory.length: " + memory.length);
        LOG.debug("compressedLength: " + compressedLength);
        LOG.debug("decompressedLength: " + decompressedLength);

        // TO-DO: would offset and length be OK to be int?
        IOUtils.readFully(input, memory, 0, memory.length);
        metrics.inputBytes((int) memory.length);
        reporter.progress();
        LOG.info("Read " + memory.length + " bytes from map-output for " + getMapId());

        /**
         * We've gotten the amount of data we were expecting. Verify the
         * decompressor has nothing more to offer. This action also forces
         * the decompressor to read any trailing bytes that weren't critical
         * for decompression, which is necessary to keep the stream in sync.
         */
        //if (input.read() >= 0) {
        //   throw new IOException(
        //         "Unexpected extra bytes from input stream for "
        //               + getMapId());
        //}
        input.close();
        raf.close();
    } catch (IOException ioe) {
        // Close the streams
        IOUtils.cleanup(LOG, input);

        // Re-throw
        throw ioe;
    } finally {
        CodecPool.returnDecompressor(decompressor);
    }
}

---

From source file:it.doqui.index.ecmengine.business.personalization.multirepository.FileContentReaderDynamic.java

@Override
protected ReadableByteChannel getDirectReadableChannel() throws ContentIOException {
    try {/*from  w w w .  ja v  a  2  s  . c  o m*/
        // the file must exist
        if (!file.exists()) {
            throw new IOException("File does not exist: " + file);
        }
        // create the channel
        ReadableByteChannel channel = null;
        if (allowRandomAccess) {
            RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r"); // won't create it
            channel = randomAccessFile.getChannel();
        } else {
            InputStream is = new FileInputStream(file);
            channel = Channels.newChannel(is);
        }
        // done
        if (logger.isDebugEnabled()) {
            logger.debug("Opened write channel to file: \n" + "   file: " + file + "\n" + "   random-access: "
                    + allowRandomAccess);
        }
        return channel;
    } catch (Throwable e) {
        throw new ContentIOException("Failed to open file channel: " + this, e);
    }
}

---

From source file:com.norconex.commons.lang.io.CachedOutputStream.java

@SuppressWarnings("resource")
private void cacheToFile() throws IOException {
    fileCache = File.createTempFile("CachedOutputStream-", "-temp", cacheDirectory);
    fileCache.deleteOnExit();/*from   ww w  .j  a  va 2s. co  m*/
    LOG.debug("Reached max cache size. Swapping to file: " + fileCache);
    RandomAccessFile f = new RandomAccessFile(fileCache, "rw");
    FileChannel channel = f.getChannel();
    fileOutputStream = Channels.newOutputStream(channel);

    IOUtils.write(memOutputStream.toByteArray(), fileOutputStream);
    memOutputStream = null;
}

---

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