Example usage for java.io RandomAccessFile getFD

List of usage examples for java.io RandomAccessFile getFD

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Introduction

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

Prototype

public final FileDescriptor getFD() throws IOException

Source Link

Document

Returns the opaque file descriptor object associated with this stream.

Usage

From source file:github.daneren2005.dsub.util.FileUtil.java

public static <T extends Serializable> T deserialize(Context context, String fileName, Class<T> tClass,
        int hoursOld) {
    Input in = null;//from  www .  j ava2  s  .c om
    try {
        File file = new File(context.getCacheDir(), fileName);
        if (!file.exists()) {
            return null;
        }

        if (hoursOld != 0) {
            Date fileDate = new Date(file.lastModified());
            // Convert into hours
            long age = (new Date().getTime() - fileDate.getTime()) / 1000 / 3600;
            if (age > hoursOld) {
                return null;
            }
        }

        RandomAccessFile randomFile = new RandomAccessFile(file, "r");

        in = new Input(new FileInputStream(randomFile.getFD()));
        synchronized (kryo) {
            T result = kryo.readObject(in, tClass);
            return result;
        }
    } catch (FileNotFoundException e) {
        // Different error message
        Log.w(TAG, "No serialization for object from " + fileName);
        return null;
    } catch (Throwable x) {
        Log.w(TAG, "Failed to deserialize object from " + fileName);
        return null;
    } finally {
        Util.close(in);
    }
}

From source file:github.daneren2005.dsub.util.FileUtil.java

public static <T extends Serializable> boolean serialize(Context context, T obj, String fileName) {
    Output out = null;/*from ww  w  .j a va 2s. c o m*/
    try {
        RandomAccessFile file = new RandomAccessFile(context.getCacheDir() + "/" + fileName, "rw");
        out = new Output(new FileOutputStream(file.getFD()));
        synchronized (kryo) {
            kryo.writeObject(out, obj);
        }
        return true;
    } catch (Throwable x) {
        Log.w(TAG, "Failed to serialize object to " + fileName);
        return false;
    } finally {
        Util.close(out);
    }
}

From source file:org.apache.hadoop.io.nativeio.NativeIO2.java

/**
 * Create a FileInputStream that shares delete permission on the
 * file opened at a given offset, i.e. other process can delete
 * the file the FileInputStream is reading. Only Windows implementation
 * uses the native interface.//from  www. ja v  a  2s. c om
 */
public static FileInputStream getShareDeleteFileInputStream(File f, long seekOffset) throws IOException {
    if (!Shell.WINDOWS) {
        RandomAccessFile rf = new RandomAccessFile(f, "r");
        if (seekOffset > 0) {
            rf.seek(seekOffset);
        }
        return new FileInputStream(rf.getFD());
    } else {
        // Use Windows native interface to create a FileInputStream that
        // shares delete permission on the file opened, and set it to the
        // given offset.
        //
        FileDescriptor fd = NativeIO2.Windows.createFile(
                f.getAbsolutePath(), NativeIO2.Windows.GENERIC_READ, NativeIO2.Windows.FILE_SHARE_READ
                        | NativeIO2.Windows.FILE_SHARE_WRITE | NativeIO2.Windows.FILE_SHARE_DELETE,
                NativeIO2.Windows.OPEN_EXISTING);
        if (seekOffset > 0)
            NativeIO2.Windows.setFilePointer(fd, seekOffset, NativeIO2.Windows.FILE_BEGIN);
        return new FileInputStream(fd);
    }
}

From source file:github.daneren2005.dsub.util.FileUtil.java

public static <T extends Serializable> boolean serializeCompressed(Context context, T obj, String fileName) {
    Output out = null;/*ww  w.  ja  v a 2 s.co  m*/
    try {
        RandomAccessFile file = new RandomAccessFile(context.getCacheDir() + "/" + fileName, "rw");
        out = new Output(new DeflaterOutputStream(new FileOutputStream(file.getFD())));
        synchronized (kryo) {
            kryo.writeObject(out, obj);
        }
        return true;
    } catch (Throwable x) {
        Log.w(TAG, "Failed to serialize compressed object to " + fileName);
        return false;
    } finally {
        Util.close(out);
    }
}

From source file:com.buaa.cfs.io.nativeio.NativeIO.java

/**
 * Create a FileInputStream that shares delete permission on the file opened at a given offset, i.e. other process
 * can delete the file the FileInputStream is reading. Only Windows implementation uses the native interface.
 *///from   w  w w.j ava2s . c o m
public static FileInputStream getShareDeleteFileInputStream(File f, long seekOffset) throws IOException {
    if (!Shell.WINDOWS) {
        RandomAccessFile rf = new RandomAccessFile(f, "r");
        if (seekOffset > 0) {
            rf.seek(seekOffset);
        }
        return new FileInputStream(rf.getFD());
    } else {
        // Use Windows native interface to create a FileInputStream that
        // shares delete permission on the file opened, and set it to the
        // given offset.
        //
        FileDescriptor fd = NativeIO.Windows.createFile(
                f.getAbsolutePath(), NativeIO.Windows.GENERIC_READ, NativeIO.Windows.FILE_SHARE_READ
                        | NativeIO.Windows.FILE_SHARE_WRITE | NativeIO.Windows.FILE_SHARE_DELETE,
                NativeIO.Windows.OPEN_EXISTING);
        if (seekOffset > 0)
            NativeIO.Windows.setFilePointer(fd, seekOffset, NativeIO.Windows.FILE_BEGIN);
        return new FileInputStream(fd);
    }
}

From source file:github.daneren2005.dsub.util.FileUtil.java

@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public static <T extends Serializable> T deserializeCompressed(Context context, String fileName,
        Class<T> tClass) {/* w w w  .jav  a2s  .  c  o m*/
    Input in = null;
    try {
        RandomAccessFile file = new RandomAccessFile(context.getCacheDir() + "/" + fileName, "r");

        in = new Input(new InflaterInputStream(new FileInputStream(file.getFD())));
        synchronized (kryo) {
            T result = kryo.readObject(in, tClass);
            return result;
        }
    } catch (FileNotFoundException e) {
        // Different error message
        Log.w(TAG, "No serialization compressed for object from " + fileName);
        return null;
    } catch (Throwable x) {
        Log.w(TAG, "Failed to deserialize compressed object from " + fileName);
        return null;
    } finally {
        Util.close(in);
    }
}

From source file:org.apache.flume.channel.file.TestEventQueueBackingStoreFactory.java

@Test(expected = BadCheckpointException.class)
public void testTruncateMeta() throws Exception {
    EventQueueBackingStore backingStore = EventQueueBackingStoreFactory.get(checkpoint, 10, "test");
    backingStore.close();/*from  w  ww. jav a  2s .  com*/
    Assert.assertTrue(checkpoint.exists());
    File metaFile = Serialization.getMetaDataFile(checkpoint);
    Assert.assertTrue(metaFile.length() != 0);
    RandomAccessFile writer = new RandomAccessFile(metaFile, "rw");
    writer.setLength(0);
    writer.getFD().sync();
    writer.close();
    backingStore = EventQueueBackingStoreFactory.get(checkpoint, 10, "test");
}

From source file:com.thoughtworks.go.config.GoConfigFileWriter.java

public synchronized void writeToConfigXmlFile(String content) {
    FileChannel channel = null;//from  w  w  w.  j  a v  a 2s. c o m
    FileOutputStream outputStream = null;
    FileLock lock = null;

    try {
        RandomAccessFile randomAccessFile = new RandomAccessFile(fileLocation(), "rw");
        channel = randomAccessFile.getChannel();
        lock = channel.lock();
        randomAccessFile.seek(0);
        randomAccessFile.setLength(0);
        outputStream = new FileOutputStream(randomAccessFile.getFD());

        IOUtils.write(content, outputStream, UTF_8);
    } catch (Exception e) {
        throw new RuntimeException(e);
    } finally {
        if (channel != null && lock != null) {
            try {
                lock.release();
                channel.close();
                IOUtils.closeQuietly(outputStream);
            } catch (IOException e) {
                LOGGER.error("Error occured when releasing file lock and closing file.", e);
            }
        }
    }
}

From source file:org.apache.flume.channel.file.TestEventQueueBackingStoreFactory.java

@Test(expected = InvalidProtocolBufferException.class)
public void testCorruptMeta() throws Throwable {
    EventQueueBackingStore backingStore = EventQueueBackingStoreFactory.get(checkpoint, 10, "test");
    backingStore.close();/*from  w ww .  j a va  2  s  .com*/
    Assert.assertTrue(checkpoint.exists());
    File metaFile = Serialization.getMetaDataFile(checkpoint);
    Assert.assertTrue(metaFile.length() != 0);
    RandomAccessFile writer = new RandomAccessFile(metaFile, "rw");
    writer.seek(10);
    writer.writeLong(new Random().nextLong());
    writer.getFD().sync();
    writer.close();
    try {
        backingStore = EventQueueBackingStoreFactory.get(checkpoint, 10, "test");
    } catch (BadCheckpointException ex) {
        throw ex.getCause();
    }
}

From source file:tayler.TailerTest.java

protected void eraseFile(File file) throws IOException {
    RandomAccessFile raf = new RandomAccessFile(file, "rws");
    try {//w w w .  j a  va 2  s  . c o m
        raf.setLength(0);
        raf.getFD().sync();
    } finally {
        IOUtils.closeQuietly(raf);
    }
}