Example usage for java.io RandomAccessFile close

Introduction

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

Prototype

public void close() throws IOException 

Source Link

Document

Closes this random access file stream and releases any system resources associated with the stream.

Usage

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

private void doTestCorruptInflights(String name, boolean backup) throws Exception {
    Map<String, String> overrides = Maps.newHashMap();
    overrides.put(FileChannelConfiguration.USE_DUAL_CHECKPOINTS, String.valueOf(backup));
    channel = createFileChannel(overrides);
    channel.start();/* www.  j  a  v  a  2  s .c om*/
    Assert.assertTrue(channel.isOpen());
    final Set<String> in1 = putEvents(channel, "restart-", 10, 100);
    Assert.assertEquals(100, in1.size());
    Executors.newSingleThreadScheduledExecutor().submit(new Runnable() {
        @Override
        public void run() {
            Transaction tx = channel.getTransaction();
            Set<String> out1 = takeWithoutCommit(channel, tx, 100);
            Assert.assertEquals(100, out1.size());
        }
    });
    Transaction tx = channel.getTransaction();
    Set<String> in2 = putWithoutCommit(channel, tx, "restart", 100);
    Assert.assertEquals(100, in2.size());
    forceCheckpoint(channel);
    if (backup) {
        Thread.sleep(2000);
    }
    tx.commit();
    tx.close();
    channel.stop();
    File inflight = new File(checkpointDir, name);
    RandomAccessFile writer = new RandomAccessFile(inflight, "rw");
    writer.write(new Random().nextInt());
    writer.close();
    channel = createFileChannel(overrides);
    channel.start();
    Assert.assertTrue(channel.isOpen());
    Assert.assertTrue(!backup || channel.checkpointBackupRestored());
    Set<String> out = consumeChannel(channel);
    in1.addAll(in2);
    compareInputAndOut(in1, out);
}

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From source file:hudson.util.TextFile.java

/**
 * Efficiently reads the last N characters (or shorter, if the whole file is shorter than that.)
 *
 * <p>/*from w  w w . ja  v a  2s  .  c  o  m*/
 * This method first tries to just read the tail section of the file to get the necessary chars.
 * To handle multi-byte variable length encoding (such as UTF-8), we read a larger than
 * necessary chunk.
 *
 * <p>
 * Some multi-byte encoding, such as Shift-JIS (http://en.wikipedia.org/wiki/Shift_JIS) doesn't
 * allow the first byte and the second byte of a single char to be unambiguously identified,
 * so it is possible that we end up decoding incorrectly if we start reading in the middle of a multi-byte
 * character. All the CJK multi-byte encodings that I know of are self-correcting; as they are ASCII-compatible,
 * any ASCII characters or control characters will bring the decoding back in sync, so the worst
 * case we just have some garbage in the beginning that needs to be discarded. To accommodate this,
 * we read additional 1024 bytes.
 *
 * <p>
 * Other encodings, such as UTF-8, are better in that the character boundary is unambiguous,
 * so there can be at most one garbage char. For dealing with UTF-16 and UTF-32, we read at
 * 4 bytes boundary (all the constants and multipliers are multiples of 4.)
 *
 * <p>
 * Note that it is possible to construct a contrived input that fools this algorithm, and in this method
 * we are willing to live with a small possibility of that to avoid reading the whole text. In practice,
 * such an input is very unlikely.
 *
 * <p>
 * So all in all, this algorithm should work decently, and it works quite efficiently on a large text.
 */
public @Nonnull String fastTail(int numChars, Charset cs) throws IOException {
    RandomAccessFile raf = new RandomAccessFile(file, "r");

    try {
        long len = raf.length();
        // err on the safe side and assume each char occupies 4 bytes
        // additional 1024 byte margin is to bring us back in sync in case we started reading from non-char boundary.
        long pos = Math.max(0, len - (numChars * 4 + 1024));
        raf.seek(pos);

        byte[] tail = new byte[(int) (len - pos)];
        raf.readFully(tail);

        String tails = cs.decode(java.nio.ByteBuffer.wrap(tail)).toString();

        return new String(tails.substring(Math.max(0, tails.length() - numChars))); // trim the baggage of substring by allocating a new String
    } finally {
        raf.close();
    }
}

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From source file:hudson.FilePathTest.java

private void checkTarUntarRoundTrip(String filePrefix, long fileSize) throws Exception {
    final File tmpDir = temp.newFolder(filePrefix);
    final File tempFile = new File(tmpDir, filePrefix + ".log");
    RandomAccessFile file = new RandomAccessFile(tempFile, "rw");
    final File tarFile = new File(tmpDir, filePrefix + ".tar");

    file.setLength(fileSize);//  w  w  w .j ava 2s  .c o m
    assumeTrue(fileSize == file.length());
    file.close();

    // Compress archive
    final FilePath tmpDirPath = new FilePath(tmpDir);
    int tar = tmpDirPath.tar(new FileOutputStream(tarFile), tempFile.getName());
    assertEquals("One file should have been compressed", 1, tar);

    // Decompress
    FilePath outDir = new FilePath(temp.newFolder(filePrefix + "_out"));
    final FilePath outFile = outDir.child(tempFile.getName());
    tmpDirPath.child(tarFile.getName()).untar(outDir, TarCompression.NONE);
    assertEquals("Result file after the roundtrip differs from the initial file",
            new FilePath(tempFile).digest(), outFile.digest());
}

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From source file:dk.statsbiblioteket.util.LineReaderTest.java

public void testReadTypes() throws Exception {
    File temp = createTempFile();
    RandomAccessFile raf = new RandomAccessFile(temp, "rw");
    writeSample(raf);/*from   w  w w  . j av  a 2 s.c o m*/
    raf.close();

    LineReader lr = new LineReader(temp, "rw");
    testSample("LR", lr);
    lr.close();

    temp.createNewFile();
    lr = new LineReader(temp, "rw");
    writeSample(lr);
    lr.close();

    raf = new RandomAccessFile(temp, "rw");
    testSample("RA", raf);
    raf.close();
}

---

From source file:com.liferay.portal.util.FileImpl.java

public byte[] getBytes(File file) throws IOException {
    if ((file == null) || !file.exists()) {
        return null;
    }//from w ww .  j  a  va2 s.co  m

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

    byte[] bytes = new byte[(int) randomAccessFile.length()];

    randomAccessFile.readFully(bytes);

    randomAccessFile.close();

    return bytes;
}

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

public static LogFileHeader readLogFileHeader(File logFileName) throws IOException {

    LogFileHeader headerOut = new LogFileHeader();
    RandomAccessFile file = new RandomAccessFile(logFileName, "r");
    try {/* w ww  .j  a  va2s . c o  m*/
        headerOut = readLogFileHeader(file);
    } finally {
        file.close();
    }
    return headerOut;
}

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From source file:cd.education.data.collector.android.utilities.EncryptionUtils.java

private static void encryptFile(File file, EncryptedFormInformation formInfo)
        throws IOException, EncryptionException {
    File encryptedFile = new File(file.getParentFile(), file.getName() + ".enc");

    if (encryptedFile.exists() && !encryptedFile.delete()) {
        throw new IOException(
                "Cannot overwrite " + encryptedFile.getAbsolutePath() + ". Perhaps the file is locked?");
    }/*from w w  w.j a  va2  s  . com*/

    // add elementSignatureSource for this file...
    formInfo.appendFileSignatureSource(file);

    RandomAccessFile randomAccessFile = null;
    CipherOutputStream cipherOutputStream = null;
    try {
        Cipher c = formInfo.getCipher();

        randomAccessFile = new RandomAccessFile(encryptedFile, "rws");
        ByteArrayOutputStream encryptedData = new ByteArrayOutputStream();
        cipherOutputStream = new CipherOutputStream(encryptedData, c);
        InputStream fin = new FileInputStream(file);
        byte[] buffer = new byte[2048];
        int len = fin.read(buffer);
        while (len != -1) {
            cipherOutputStream.write(buffer, 0, len);
            len = fin.read(buffer);
        }
        fin.close();
        cipherOutputStream.flush();
        cipherOutputStream.close();

        randomAccessFile.write(encryptedData.toByteArray());

        Log.i(t, "Encrpyted:" + file.getName() + " -> " + encryptedFile.getName());
    } catch (Exception e) {
        String msg = "Error encrypting: " + file.getName() + " -> " + encryptedFile.getName();
        Log.e(t, msg, e);
        e.printStackTrace();
        throw new EncryptionException(msg, e);
    } finally {
        IOUtils.closeQuietly(cipherOutputStream);

        if (randomAccessFile != null) {
            randomAccessFile.close();
        }
    }
}

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

private void doTestTruncatedCheckpointMeta(boolean backup) throws Exception {
    Map<String, String> overrides = Maps.newHashMap();
    overrides.put(FileChannelConfiguration.USE_DUAL_CHECKPOINTS, String.valueOf(backup));
    channel = createFileChannel(overrides);
    channel.start();/*from  w  w w.  j a  va  2 s. com*/
    Assert.assertTrue(channel.isOpen());
    Set<String> in = putEvents(channel, "restart", 10, 100);
    Assert.assertEquals(100, in.size());
    forceCheckpoint(channel);
    if (backup) {
        Thread.sleep(2000);
    }
    channel.stop();
    File checkpoint = new File(checkpointDir, "checkpoint");
    RandomAccessFile writer = new RandomAccessFile(Serialization.getMetaDataFile(checkpoint), "rw");
    writer.setLength(0);
    writer.getFD().sync();
    writer.close();
    channel = createFileChannel(overrides);
    channel.start();
    Assert.assertTrue(channel.isOpen());
    Assert.assertTrue(!backup || channel.checkpointBackupRestored());
    Set<String> out = consumeChannel(channel);
    compareInputAndOut(in, out);
}

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From source file:com.csipsimple.service.DownloadLibService.java

private boolean installRemoteLib(RemoteLibInfo lib) {
    String fileName = lib.getFileName();
    File filePath = lib.getFilePath();

    File tmp_gz = new File(filePath, fileName + ".gz");
    File dest = new File(filePath, fileName);

    try {/*  w  w  w.  j a  v a 2 s.c  o m*/
        if (dest.exists()) {
            dest.delete();
        }
        RandomAccessFile out = new RandomAccessFile(dest, "rw");
        out.seek(0);
        GZIPInputStream zis = new GZIPInputStream(new FileInputStream(tmp_gz));
        int len;
        byte[] buf = new byte[BUFFER];
        while ((len = zis.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        zis.close();
        out.close();
        Log.d(THIS_FILE, "Ungzip is in : " + dest.getAbsolutePath());
        tmp_gz.delete();
        //Update preferences fields with current stack values
        Editor editor = prefs.edit();
        editor.putString(CURRENT_STACK_ID, lib.getId());
        editor.putString(CURRENT_STACK_VERSION, lib.getVersion());
        editor.putString(CURRENT_STACK_URI, lib.getDownloadUri().toString());
        editor.commit();
        return true;
    } catch (IOException e) {
        Log.e(THIS_FILE, "We failed to install it ", e);
    }
    return false;
}

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From source file:au.org.ala.layers.web.UserDataService.java

private void setImageBlank(HttpServletResponse response) {
    if (blankImageBytes == null && blankImageObject != null) {
        synchronized (blankImageObject) {
            if (blankImageBytes == null) {
                try {
                    RandomAccessFile raf = new RandomAccessFile(
                            UserDataService.class.getResource("/blank.png").getFile(), "r");
                    blankImageBytes = new byte[(int) raf.length()];
                    raf.read(blankImageBytes);
                    raf.close();
                } catch (IOException e) {
                    logger.error("error reading default blank tile", e);
                }/*from   w  w w  . ja  v a2s.  c  om*/
            }
        }
    }
    if (blankImageObject != null) {
        response.setContentType("image/png");
        try {
            ServletOutputStream outStream = response.getOutputStream();
            outStream.write(blankImageBytes);
            outStream.flush();
            outStream.close();
        } catch (IOException e) {
            logger.error("error outputting blank tile", e);
        }
    }
}

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