Example usage for java.io RandomAccessFile setLength

Introduction

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

Prototype

public native void setLength(long newLength) throws IOException;

Source Link

Document

Sets the length of this file.

Usage

From source file:org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice.java

/**
 * Find out the number of bytes in the block that match its crc.
 * <p/>/*  w w w  . j a va  2  s . c o m*/
 * This algorithm assumes that data corruption caused by unexpected
 * datanode shutdown occurs only in the last crc chunk. So it checks
 * only the last chunk.
 *
 * @param blockFile
 *     the block file
 * @param genStamp
 *     generation stamp of the block
 * @return the number of valid bytes
 */
private long validateIntegrityAndSetLength(File blockFile, long genStamp) {
    DataInputStream checksumIn = null;
    InputStream blockIn = null;
    try {
        final File metaFile = FsDatasetUtil.getMetaFile(blockFile, genStamp);
        long blockFileLen = blockFile.length();
        long metaFileLen = metaFile.length();
        int crcHeaderLen = DataChecksum.getChecksumHeaderSize();
        if (!blockFile.exists() || blockFileLen == 0 || !metaFile.exists() || metaFileLen < crcHeaderLen) {
            return 0;
        }
        checksumIn = new DataInputStream(
                new BufferedInputStream(new FileInputStream(metaFile), HdfsConstants.IO_FILE_BUFFER_SIZE));

        // read and handle the common header here. For now just a version
        BlockMetadataHeader header = BlockMetadataHeader.readHeader(checksumIn);
        short version = header.getVersion();
        if (version != BlockMetadataHeader.VERSION) {
            FsDatasetImpl.LOG
                    .warn("Wrong version (" + version + ") for metadata file " + metaFile + " ignoring ...");
        }
        DataChecksum checksum = header.getChecksum();
        int bytesPerChecksum = checksum.getBytesPerChecksum();
        int checksumSize = checksum.getChecksumSize();
        long numChunks = Math.min((blockFileLen + bytesPerChecksum - 1) / bytesPerChecksum,
                (metaFileLen - crcHeaderLen) / checksumSize);
        if (numChunks == 0) {
            return 0;
        }
        IOUtils.skipFully(checksumIn, (numChunks - 1) * checksumSize);
        blockIn = new FileInputStream(blockFile);
        long lastChunkStartPos = (numChunks - 1) * bytesPerChecksum;
        IOUtils.skipFully(blockIn, lastChunkStartPos);
        int lastChunkSize = (int) Math.min(bytesPerChecksum, blockFileLen - lastChunkStartPos);
        byte[] buf = new byte[lastChunkSize + checksumSize];
        checksumIn.readFully(buf, lastChunkSize, checksumSize);
        IOUtils.readFully(blockIn, buf, 0, lastChunkSize);

        checksum.update(buf, 0, lastChunkSize);
        long validFileLength;
        if (checksum.compare(buf, lastChunkSize)) { // last chunk matches crc
            validFileLength = lastChunkStartPos + lastChunkSize;
        } else { // last chunck is corrupt
            validFileLength = lastChunkStartPos;
        }

        // truncate if extra bytes are present without CRC
        if (blockFile.length() > validFileLength) {
            RandomAccessFile blockRAF = new RandomAccessFile(blockFile, "rw");
            try {
                // truncate blockFile
                blockRAF.setLength(validFileLength);
            } finally {
                blockRAF.close();
            }
        }

        return validFileLength;
    } catch (IOException e) {
        FsDatasetImpl.LOG.warn(e);
        return 0;
    } finally {
        IOUtils.closeStream(checksumIn);
        IOUtils.closeStream(blockIn);
    }
}

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From source file:org.interreg.docexplore.authoring.AuthoringMenu.java

void writeRecent() {
    try {/*from  w w  w.  ja v  a  2s .c  o  m*/
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(recent);
        oos.flush();
        RandomAccessFile file = new RandomAccessFile(new File(DocExploreTool.getHomeDir(), "ATRecent"), "rw");
        file.setLength(0);
        file.write(baos.toByteArray());
        file.close();
        oos.close();

        //         ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(new File("ATRecent"), false));
        //         out.writeObject(recent);
        //         out.close();
    } catch (Exception e) {
        ErrorHandler.defaultHandler.submit(e, true);
    }
}

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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  a v a2 s . 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();
        }
    }
}

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From source file:com.roamtouch.menuserver.utils.FileUtils.java

private void removeLastCharacter(File fileName) {

    RandomAccessFile f;
    long length;//from w  w  w  .  j  ava  2s .c  om

    try {

        f = new RandomAccessFile(fileName, "rw");
        length = f.length();
        long l;

        if (length > 0)
            l = length - 1;
        else
            l = length;

        f.setLength(l);
        f.close();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

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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);
    assumeTrue(fileSize == file.length());
    file.close();/* w  w w  .  j  a  v  a 2s . c  o m*/

    // 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:org.kchine.rpf.PoolUtils.java

public static void killLocalWinProcess(String processId, boolean isKILLSIG) throws Exception {

    String killpath = System.getProperty("java.io.tmpdir") + "/rpf/WinTools/" + "kill.exe";
    File killFile = new File(killpath);
    if (!killFile.exists()) {
        killFile.getParentFile().mkdirs();
        InputStream is = PoolUtils.class.getResourceAsStream("/wintools/kill.exe");
        RandomAccessFile raf = new RandomAccessFile(killFile, "rw");
        raf.setLength(0);
        int b;/*  w w  w . j  av  a  2  s.  co  m*/
        while ((b = is.read()) != -1)
            raf.write((byte) b);
        raf.close();
    }
    String[] command = new String[] { killpath, processId };
    Runtime rt = Runtime.getRuntime();
    final Process proc = rt.exec(command);

    final StringBuffer killPrint = new StringBuffer();
    final StringBuffer errorPrint = new StringBuffer();
    new Thread(new Runnable() {
        public void run() {
            try {
                InputStream is = proc.getInputStream();
                int b;
                while ((b = is.read()) != -1) {
                    killPrint.append((char) b);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
    new Thread(new Runnable() {
        public void run() {
            try {
                InputStream is = proc.getErrorStream();
                int b;
                while ((b = is.read()) != -1) {
                    errorPrint.append((char) b);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();

    int exitVal = proc.waitFor();
    if (exitVal != 0)
        throw new Exception("kill exit code : " + exitVal + "\n" + errorPrint);
}

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From source file:com.asakusafw.runtime.util.lock.LocalFileLockProvider.java

@Override
public LocalFileLockObject<T> tryLock(T target) throws IOException {
    if (baseDirectory.mkdirs() == false && baseDirectory.isDirectory() == false) {
        throw new IOException(MessageFormat.format("Failed to create lock directory: {0}", baseDirectory));
    }/*from   w ww  .  java2  s .  c  o m*/
    String fileName = String.format("%08x.lck", target == null ? -1 : target.hashCode()); //$NON-NLS-1$
    File lockFile = new File(baseDirectory, fileName);
    RandomAccessFile fd = new RandomAccessFile(lockFile, "rw"); //$NON-NLS-1$
    boolean success = false;
    try {
        if (LOG.isDebugEnabled()) {
            LOG.debug(MessageFormat.format("Start to acquire lock for \"{0}\" ({1})", //$NON-NLS-1$
                    target, lockFile));
        }
        FileLock lockEntity = getLock(target, lockFile, fd);
        if (lockEntity == null) {
            return null;
        } else {
            if (LOG.isDebugEnabled()) {
                LOG.debug(MessageFormat.format("Finished to acquire lock for \"{0}\" ({1})", //$NON-NLS-1$
                        target, lockFile));
            }
            try {
                fd.seek(0L);
                fd.setLength(0L);
                fd.write(String.valueOf(target).getBytes(ENCODING));
                success = true;
                return new LocalFileLockObject<>(target, lockFile, fd, lockEntity);
            } finally {
                if (success == false) {
                    lockEntity.release();
                }
            }
        }
    } finally {
        if (success == false) {
            fd.close();
        }
    }
}

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From source file:org.kchine.rpf.PoolUtils.java

public static String currentWinProcessID() throws Exception {

    String pslistpath = System.getProperty("java.io.tmpdir") + "/rpf/WinTools/" + "ps.exe";
    System.out.println(pslistpath);
    File pslistFile = new File(pslistpath);
    if (!pslistFile.exists()) {
        pslistFile.getParentFile().mkdirs();
        InputStream is = PoolUtils.class.getResourceAsStream("/wintools/ps.exe");
        RandomAccessFile raf = new RandomAccessFile(pslistFile, "rw");
        raf.setLength(0);
        int b;//from www  . j a v a2s . c  o  m
        while ((b = is.read()) != -1)
            raf.write((byte) b);
        raf.close();
    }
    String[] command = new String[] { pslistpath };
    Runtime rt = Runtime.getRuntime();
    final Process proc = rt.exec(command);
    final StringBuffer psPrint = new StringBuffer();
    final StringBuffer psError = new StringBuffer();
    new Thread(new Runnable() {
        public void run() {
            try {
                InputStream is = proc.getInputStream();
                int b;
                while ((b = is.read()) != -1) {
                    psPrint.append((char) b);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
    new Thread(new Runnable() {
        public void run() {
            try {
                InputStream is = proc.getErrorStream();
                int b;
                while ((b = is.read()) != -1) {
                    psError.append((char) b);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();

    int exitVal = proc.waitFor();
    if (exitVal != 0)
        throw new Exception("ps exit code : " + exitVal);

    BufferedReader reader = new BufferedReader(new StringReader(psPrint.toString()));
    String line;
    int i = 0;
    while (!(line = reader.readLine()).startsWith("PID  PPID  THR PR NAME"))
        ++i;
    ++i;
    while ((line = reader.readLine()) != null) {
        StringTokenizer st = new StringTokenizer(line, " ");
        st.nextElement();
        String PPID = (String) st.nextElement();
        st.nextElement();
        st.nextElement();
        if (line.endsWith("\\ps.exe"))
            return PPID;
        ++i;
    }
    return null;
}

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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  .  jav  a2 s  . c  o m
    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.stimulus.archiva.domain.Volume.java

protected void writeVolumeInfoLines(RandomAccessFile out) {
    try {/* www . j a  v  a 2  s  .c om*/
        logger.debug("writeVolumeInfoLines()");
        out.setLength(0);
        out.seek(0);
        // don't save to ejected volume
        if (isEjected())
            return;

        // make a new volume unused
        if (getStatus() == Volume.Status.NEW)
            setStatus(Volume.Status.UNUSED);
        out.seek(0); //Seek to end of file
        out.writeBytes("# Archiva " + Config.getConfig().getApplicationVersion() + " Volume Information\n");
        out.writeBytes("# note: this file is crucial - do not delete it!\n");
        out.writeBytes("version:3\n");
        if (getID() != null || getID().length() > 0) {
            out.writeBytes("id:" + getID() + "\n");
        }
        if (getStatus() != null) {
            out.writeBytes("status:" + getStatus() + "\n");
        }
        if (getCreatedDate() != null)
            out.writeBytes("created:" + DateUtil.convertDatetoString(getCreatedDate()) + "\n");
        if (getClosedDate() != null)
            out.writeBytes("closed:" + DateUtil.convertDatetoString(getClosedDate()) + "\n");

    } catch (IOException io) {
        if (getStatus() != Volume.Status.UNMOUNTED)
            logger.error("failed to write volumeinfo. {" + toString() + "} cause:" + io, io);
    } catch (ConfigurationException ce) {
        logger.error("failed to set volume status. {" + toString() + "} cause:" + ce, ce);
    }
}

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