Example usage for java.io RandomAccessFile RandomAccessFile

Introduction

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

Prototype

public RandomAccessFile(File file, String mode) throws FileNotFoundException 

Source Link

Document

Creates a random access file stream to read from, and optionally to write to, the file specified by the File argument.

Usage

From source file:com.adaptris.fs.NioWorkerTest.java

@Test
public void testLockWhileReading() throws Exception {
    FsWorker worker = createWorker();//from  w w w.j  a  v  a  2 s .com
    File f = File.createTempFile(this.getClass().getSimpleName(), "");
    f.delete();
    try {
        worker.put(BYTES, f);

        RandomAccessFile raf = new RandomAccessFile(f, "rwd");
        FileLock lock = raf.getChannel().lock();
        try {
            worker.get(f);
            fail();
        } catch (FsException expected) {
            assertEquals(OverlappingFileLockException.class, expected.getCause().getClass());
        }
        lock.release();
        raf.close();
        worker.get(f);
    } finally {
        FileUtils.deleteQuietly(f);
    }
}

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From source file:hoot.services.info.ErrorLog.java

public String getErrorlog(long maxLength) throws Exception {

    File file = new File(_errLogPath);
    RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
    int lines = 0;
    StringBuilder builder = new StringBuilder();
    long length = file.length();
    //length--;/*from   w ww. ja  v a2s.c  o  m*/

    long startOffset = 0;
    if (length > maxLength) {
        startOffset = length - maxLength;
    }
    for (long seek = startOffset; seek < length; seek++) {
        randomAccessFile.seek(seek);
        char c = (char) randomAccessFile.read();
        builder.append(c);
    }

    randomAccessFile.close();

    return builder.toString();
}

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From source file:net.sourceforge.doddle_owl.data.JpnWordNetDic.java

public static boolean initJPNWNDic() {
    if (jpnwnURIConceptMap != null && 0 < jpnwnURIConceptMap.size()) {
        return true;
    }/*w w  w.ja v a  2 s.  c  om*/
    jpnwnURIConceptMap = new HashMap<String, Concept>();
    jpnwnWordIDSetMap = new HashMap<String, Set<String>>();
    // String baseDir = DODDLEConstants.JPWN_HOME + File.separator;
    try {
        // jpnwnTreeDataFile = new RandomAccessFile(baseDir +
        // TREE_DATA_FILE, "r");
        jpnwnTreeDataFile = new RandomAccessFile(Utils.getJPWNFile(TREE_DATA_FILE), "r");
        // jpnwnWordDataFile = new RandomAccessFile(baseDir +
        // WORD_DATA_FILE, "r");
        jpnwnWordDataFile = new RandomAccessFile(Utils.getJPWNFile(WORD_DATA_FILE), "r");
        // jpnwnConceptDataFile = new RandomAccessFile(baseDir +
        // CONCEPT_DATA_FILE, "r");
        jpnwnConceptDataFile = new RandomAccessFile(Utils.getJPWNFile(CONCEPT_DATA_FILE), "r");

        // jpnwnTreeIndexFile = new RandomAccessFile(baseDir +
        // TREE_INDEX_FILE, "r");
        jpnwnTreeIndexFile = new RandomAccessFile(Utils.getJPWNFile(TREE_INDEX_FILE), "r");
        // jpnwnWordIndexFile = new RandomAccessFile(baseDir +
        // WORD_INDEX_FILE, "r");
        jpnwnWordIndexFile = new RandomAccessFile(Utils.getJPWNFile(WORD_INDEX_FILE), "r");
        // jpnwnConceptIndexFile = new RandomAccessFile(baseDir +
        // CONCEPT_INDEX_FILE, "r");
        jpnwnConceptIndexFile = new RandomAccessFile(Utils.getJPWNFile(CONCEPT_INDEX_FILE), "r");
    } catch (IOException ioe) {
        ioe.printStackTrace();
        return false;
    }
    return true;
}

---

From source file:com.btoddb.fastpersitentqueue.JournalFileTest.java

@Test
public void testInitForWritingThenClose() throws IOException {
    JournalFile jf1 = new JournalFile(theFile);
    jf1.initForWriting(new UUID());
    assertThat(jf1.isWriteMode(), is(true));
    assertThat(jf1.isOpen(), is(true));/*from   w  w  w.ja v a 2  s. c o  m*/
    assertThat(jf1.getFilePosition(), is((long) JournalFile.HEADER_SIZE));
    jf1.close();

    assertThat(jf1.isOpen(), is(false));

    RandomAccessFile raFile = new RandomAccessFile(theFile, "rw");
    assertThat(raFile.readInt(), is(JournalFile.VERSION));
    assertThat(Utils.readUuidFromFile(raFile), is(jf1.getId()));
    assertThat(raFile.readLong(), is(0L));
    raFile.close();
}

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From source file:com.haulmont.cuba.core.sys.logging.LogArchiver.java

private static byte[] getTailBytes(File logFile) throws FileNotFoundException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    byte[] buf = null;
    int len;/* ww  w  .  j av a 2s  .  c om*/
    int size = 1024;
    try {
        RandomAccessFile randomAccessFile = new RandomAccessFile(logFile, "r");
        long lengthFile = randomAccessFile.length();
        if (lengthFile >= LOG_TAIL_FOR_PACKING_SIZE) {
            randomAccessFile.seek(lengthFile - LOG_TAIL_FOR_PACKING_SIZE);
        }
        buf = new byte[size];
        while ((len = randomAccessFile.read(buf, 0, size)) != -1) {
            bos.write(buf, 0, len);
        }
        buf = bos.toByteArray();
    } catch (IOException e) {
        log.error("Unable to get tail for log file " + logFile.getName(), e);
    } finally {
        IOUtils.closeQuietly(bos);
    }
    return buf;
}

---

From source file:au.org.ala.spatial.util.RecordsSmall.java

public RecordsSmall(String dir) throws IOException {
    this.filename = dir + File.separator;

    //look for a small file
    File smallFile = new File(filename + "records.csv.small.species");

    if (!smallFile.exists() && new File(filename + "records.csv").exists()) {
        try {/* w w  w.ja v a2  s . c  om*/
            makeSmallFile(filename);
            makeUniquePoints();
        } catch (Exception e) {
            logger.error("failed to make small records files", e);
        }
    }

    //read species
    if (smallFile.exists()) {
        try {
            //open points and pointsToSpecies
            points = new RandomAccessFile(filename + "records.csv.small.points", "r");
            pointsToSpecies = new RandomAccessFile(filename + "records.csv.small.pointsToSpecies", "r");
            maxPoints = new File(filename + "records.csv.small.pointsToSpecies").length() / 4;
            pointsDis = new DataInputStream(
                    new BufferedInputStream(new FileInputStream(filename + "records.csv.small.points")));
            pointsToSpeciesDis = new DataInputStream(new BufferedInputStream(
                    new FileInputStream(filename + "records.csv.small.pointsToSpecies")));

            lsids = FileUtils.readLines(new File(filename + "records.csv.small.species"));

            getUniquePointsAll();
        } catch (Exception e) {
            logger.error("failed to open small records file", e);
        }
    }
}

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From source file:org.chimi.s4s.fileservice.FileLockBasedThumbnailCreator.java

@Override
public File create(FileData fileData, Size newSize) throws IOException {
    String thumbnailPath = getThumbnailPath(fileData.getFileId(), newSize);
    File thumbnailFile = new File(thumbnailPath);
    if (thumbnailFile.exists()) {
        // ? ?? //from www. j  a va2 s .c  o  m
        return thumbnailFile;
    }
    File lockFile = getLockFile(thumbnailPath);
    FileChannel channel = new RandomAccessFile(lockFile, "rw").getChannel();
    FileLock lock = null;
    try {
        lock = channel.tryLock();
    } catch (OverlappingFileLockException ex) {
    }

    if (lock == null) {
        // ??  , 1  ?? ?? ? ? 
        return createTemporaryThumbnail(thumbnailPath, fileData, newSize);
    }
    try {
        createThumbnail(thumbnailPath, fileData, newSize);
        return thumbnailFile;
    } finally {
        lock.release();
        channel.close();

        // TODO ? ?   
    }
}

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From source file:de.micromata.genome.logging.spi.ifiles.IndexedReader.java

public IndexedReader(IndexFileLoggingImpl logger, File logFile, File indexFile) throws IOException {
    this.logger = logger;
    this.logFile = logFile;
    this.indexFile = indexFile;
    idxRandomAccessFile = new RandomAccessFile(indexFile, "r");
    indexChannel = idxRandomAccessFile.getChannel();
    long chsize = indexChannel.size();
    indexByteBuffer = indexChannel.map(FileChannel.MapMode.READ_ONLY, 0, chsize);
    indexHeader = IndexHeader.openIndexHeader(indexByteBuffer, indexChannel.size());
}

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From source file:fr.letroll.ttorrentandroid.client.storage.FileStorage.java

public FileStorage(File file, long offset, long size) throws IOException {
    this.target = file;
    this.offset = offset;
    this.size = size;

    File partial = new File(this.target.getAbsolutePath() + TorrentByteStorage.PARTIAL_FILE_NAME_SUFFIX);

    if (partial.exists()) {
        logger.debug("Partial download found at {}. Continuing...", partial.getAbsolutePath());
        this.current = partial;
    } else if (!this.target.exists()) {
        logger.debug("Downloading new file to {}...", partial.getAbsolutePath());
        this.current = partial;
    } else {/*  w w  w .  j  a  v a  2s .co m*/
        logger.debug("Using existing file {}.", this.target.getAbsolutePath());
        this.current = this.target;
    }

    this.raf = new RandomAccessFile(this.current, "rw");

    // Set the file length to the appropriate size, eventually truncating
    // or extending the file if it already exists with a different size.
    this.raf.setLength(this.size);

    this.channel = raf.getChannel();
    logger.info("Initialized byte storage file at {} ({}+{} byte(s)).",
            new Object[] { this.current.getAbsolutePath(), this.offset, this.size, });
}

---

From source file:com.tps.ttorrent.client.storage.FileStorage.java

public FileStorage(File file, long offset, long size) throws IOException {
    this.target = file;
    this.offset = offset;
    this.size = size;

    this.partial = new File(this.target.getAbsolutePath() + TorrentByteStorage.PARTIAL_FILE_NAME_SUFFIX);

    if (this.partial.exists()) {
        logger.debug("Partial download found at {}. Continuing...", this.partial.getAbsolutePath());
        this.current = this.partial;
    } else if (!this.target.exists()) {
        logger.debug("Downloading new file to {}...", this.partial.getAbsolutePath());
        this.current = this.partial;
    } else {//from  ww  w. j av a 2s  .  c o  m
        logger.debug("Using existing file {}.", this.target.getAbsolutePath());
        this.current = this.target;
    }

    this.raf = new RandomAccessFile(this.current, "rw");
    this.current.deleteOnExit();

    // Set the file length to the appropriate size, eventually truncating
    // or extending the file if it already exists with a different size.
    this.raf.setLength(this.size);

    this.channel = raf.getChannel();
    logger.info("Initialized byte storage file at {} " + "({}+{} byte(s)).",
            new Object[] { this.current.getAbsolutePath(), this.offset, this.size, });
}

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