Example usage for java.nio.channels Channels newOutputStream

Introduction

In this page you can find the example usage for java.nio.channels Channels newOutputStream.

Prototype

public static OutputStream newOutputStream(AsynchronousByteChannel ch) 

Source Link

Document

Constructs a stream that writes bytes to the given channel.

Usage

From source file:com.almende.eve.state.ConcurrentJsonFileState.java

/**
 * Open file.//from w  ww .  ja  va 2s  .c o m
 * 
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 */
@SuppressWarnings("resource")
protected void openFile() throws IOException {
    synchronized (locked) {
        while (locked.containsKey(filename) && locked.get(filename)) {
            try {
                locked.wait();
            } catch (final InterruptedException e) {
            }
        }
        locked.put(filename, true);

        final File file = new File(filename);
        if (!file.exists()) {
            locked.put(filename, false);
            locked.notifyAll();
            throw new IllegalStateException("Warning: File doesn't exist (anymore):'" + filename + "'");
        }

        channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            // TODO: add support for shared locks, allowing parallel reading
            // operations.
            lock = channel.lock();

        } catch (final Exception e) {
            channel.close();
            channel = null;
            lock = null;
            locked.put(filename, false);
            locked.notifyAll();
            throw new IllegalStateException("error, couldn't obtain file lock on:" + filename, e);
        }
        fis = Channels.newInputStream(channel);
        fos = Channels.newOutputStream(channel);
    }
}

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From source file:com.lemania.sis.server.servlet.GcsServlet.java

/**
 * Writes the payload of the incoming post as the contents of a file to GCS.
 * If the request path is /gcs/Foo/Bar this will be interpreted as a request
 * to create a GCS file named Bar in bucket Foo.
 * // ww  w .j av a2s .  c o m
 * @throws ServletException
 */
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
    //
    GcsOutputChannel outputChannel = gcsService.createOrReplace(getFileName(req),
            GcsFileOptions.getDefaultInstance());

    ServletFileUpload upload = new ServletFileUpload();
    resp.setContentType("text/plain");
    //
    InputStream fileContent = null;
    FileItemIterator iterator;
    try {
        iterator = upload.getItemIterator(req);
        while (iterator.hasNext()) {
            FileItemStream item = iterator.next();
            InputStream stream = item.openStream();

            if (item.isFormField()) {
                //
            } else {
                fileContent = stream;
                break;
            }
        }
    } catch (FileUploadException e) {
        //
        e.printStackTrace();
    }
    //
    copy(fileContent, Channels.newOutputStream(outputChannel));
}

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From source file:com.almende.eve.state.file.ConcurrentSerializableFileState.java

/**
 * Open file./* w w w .ja v a2  s .  c  om*/
 * 
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 */
@SuppressWarnings("resource")
protected void openFile() throws IOException {
    synchronized (locked) {
        while (locked.containsKey(filename) && locked.get(filename)) {
            try {
                locked.wait();
            } catch (final InterruptedException e) {
            }
        }
        locked.put(filename, true);

        final File file = new File(filename);
        if (!file.exists()) {
            locked.put(filename, false);
            locked.notifyAll();
            throw new IllegalStateException("Warning: File doesn't exist (anymore):'" + filename + "'");
        }
        channel = new RandomAccessFile(file, "rw").getChannel();

        try {
            // TODO: add support for shared locks, allowing parallel reading
            // operations.
            lock = channel.lock();
        } catch (final Exception e) {
            channel.close();
            channel = null;
            lock = null;
            locked.put(filename, false);
            locked.notifyAll();
            throw new IllegalStateException("error, couldn't obtain file lock on:" + filename, e);
        }
        fis = new BufferedInputStream(Channels.newInputStream(channel));
        fos = new BufferedOutputStream(Channels.newOutputStream(channel));
    }
}

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From source file:com.almende.eve.state.file.ConcurrentJsonFileState.java

/**
 * Open file.//w  ww  . ja va  2  s . co  m
 * 
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 */
@SuppressWarnings("resource")
protected void openFile() throws IOException {
    Lock llock = null;
    synchronized (LOCKED) {
        llock = LOCKED.get(filename);
        if (llock == null) {
            llock = new Lock();
            LOCKED.put(filename, llock);
        }
    }
    synchronized (llock) {
        while (llock.locked) {
            try {
                llock.wait();
            } catch (final InterruptedException e) {
            }
        }
        llock.locked = true;

        final File file = new File(filename);
        if (!file.exists()) {
            llock.locked = false;
            llock.notifyAll();
            throw new IllegalStateException("Warning: File doesn't exist (anymore):'" + filename + "'");
        }

        channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            // TODO: add support for shared locks, allowing parallel reading
            // operations.
            lock = channel.lock();

        } catch (final Exception e) {
            channel.close();
            channel = null;
            lock = null;
            llock.locked = false;
            llock.notifyAll();
            throw new IllegalStateException("error, couldn't obtain file lock on:" + filename, e);
        }
        fis = new BufferedInputStream(Channels.newInputStream(channel));
        fos = new BufferedOutputStream(Channels.newOutputStream(channel));
    }
}

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From source file:ee.ria.xroad.common.messagelog.archive.LogArchiveWriter.java

private boolean archiveAsicContainers() {
    try (InputStream input = logArchiveCache.getArchiveFile();
            OutputStream output = Channels.newOutputStream(archiveOut)) {
        IOUtils.copy(input, output);/*from   www. j  av a2 s. co  m*/
    } catch (IOException e) {
        log.error("Failed to archive ASiC containers due to IO error", e);
        return false;
    }

    return true;
}

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From source file:com.thinkberg.vfs.s3.jets3t.Jets3tFileObject.java

protected OutputStream doGetOutputStream(boolean bAppend) throws Exception {
    return new MonitorOutputStream(Channels.newOutputStream(getCacheFile().getChannel())) {
        protected void onClose() throws IOException {
            try {
                LOG.debug(String.format("sending '%s' to storage (cached=%b)", object.getKey(), cacheFile));
                if (cacheFile != null) {
                    FileChannel cacheFc = getCacheFile().getChannel();
                    object.setContentLength(cacheFc.size());
                    object.setDataInputStream(Channels.newInputStream(cacheFc));
                }/*from   w w  w. j  av a  2 s.c  o m*/
                service.putObject(bucket, object);
            } catch (S3ServiceException e) {
                LOG.error(String.format("can't send object '%s' to storage", object), e);
            }
        }
    };
}

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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();/*  w ww. ja va  2  s.  c  om*/
    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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From source file:com.github.jinahya.simple.file.back.LocalFileBackTest.java

@Test(enabled = true, invocationCount = 1)
public void write() throws IOException, FileBackException {

    fileContext.fileOperationSupplier(() -> FileOperation.WRITE);

    final ByteBuffer fileKey = randomFileKey();
    fileContext.targetKeySupplier(() -> fileKey);

    final Path leafPath = LocalFileBack.leafPath(rootPath, fileKey, true);

    final byte[] fileBytes = randomFileBytes();
    final boolean fileWritten = Files.isRegularFile(leafPath) || current().nextBoolean();
    if (fileWritten) {
        Files.write(leafPath, fileBytes, StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE);
        logger.trace("file written");
    }//from  ww w.  jav  a  2s .co m

    fileContext.sourceChannelSupplier(() -> Channels.newChannel(new ByteArrayInputStream(fileBytes)));

    fileContext.targetChannelConsumer(v -> {
        try {
            final long copied = IOUtils.copyLarge(new ByteArrayInputStream(fileBytes),
                    Channels.newOutputStream(v));
        } catch (final IOException ioe) {
            logger.error("failed to copy", ioe);
        }
    });

    fileBack.operate(fileContext);

    if (fileWritten) {
        final byte[] actual = Files.readAllBytes(leafPath);
        assertEquals(actual, fileBytes);
    }
}

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