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:eu.mhutti1.utils.storage.StorageDeviceUtils.java

private static boolean canWrite(File file) {
    try {/*from  w  w w  .  j a  v  a 2s.co  m*/
        RandomAccessFile randomAccessFile = new RandomAccessFile(file + "/test.txt", "rw");
        FileChannel fileChannel = randomAccessFile.getChannel();
        FileLock fileLock = fileChannel.lock();
        fileLock.release();
        fileChannel.close();
        randomAccessFile.close();
        return true;
    } catch (Exception ex) {
        return false;
    }
}

From source file:com.parse.ParseKeyValueCache.java

static String loadFromKeyValueCache(final String key, final long maxAgeMilliseconds) {
    synchronized (MUTEX_IO) {
        File file = getKeyValueCacheFile(key);
        if (file == null) {
            return null;
        }//from   w  w w  .  ja v  a2s  .c  om

        Date now = new Date();
        long oldestAcceptableAge = Math.max(0, now.getTime() - maxAgeMilliseconds);
        if (getKeyValueCacheAge(file) < oldestAcceptableAge) {
            return null;
        }

        // Update mtime to make the LRU work
        file.setLastModified(now.getTime());

        try {
            RandomAccessFile f = new RandomAccessFile(file, "r");
            byte[] bytes = new byte[(int) f.length()];
            f.readFully(bytes);
            f.close();
            return new String(bytes, "UTF-8");
        } catch (IOException e) {
            PLog.e(TAG, "error reading from cache", e);
            return null;
        }
    }
}

From source file:org.apache.solr.util.FileUtils.java

/**
 * Copied from Lucene's FSDirectory.fsync(String)
 *
 * @param fullFile the File to be synced to disk
 * @throws IOException if the file could not be synced
 *///from  www .j  a v  a2  s  .c  o  m
public static void sync(File fullFile) throws IOException {
    if (fullFile == null || !fullFile.exists())
        throw new FileNotFoundException("File does not exist " + fullFile);

    boolean success = false;
    int retryCount = 0;
    IOException exc = null;
    while (!success && retryCount < 5) {
        retryCount++;
        RandomAccessFile file = null;
        try {
            try {
                file = new RandomAccessFile(fullFile, "rw");
                file.getFD().sync();
                success = true;
            } finally {
                if (file != null)
                    file.close();
            }
        } catch (IOException ioe) {
            if (exc == null)
                exc = ioe;
            try {
                // Pause 5 msec
                Thread.sleep(5);
            } catch (InterruptedException ie) {
                Thread.currentThread().interrupt();
            }
        }
    }
    if (!success)
        // Throw original exception
        throw exc;
}

From source file:com.linkedin.pinot.perf.ForwardIndexReaderBenchmark.java

public static void singleValuedReadBenchMarkV2(File file, int numDocs, int numBits) throws Exception {
    boolean signed = false;
    boolean isMmap = false;
    long start, end;
    boolean fullScan = true;

    boolean batchRead = true;
    boolean singleRead = true;

    PinotDataBuffer heapBuffer = PinotDataBuffer.fromFile(file, ReadMode.heap, FileChannel.MapMode.READ_ONLY,
            "benchmarking");
    com.linkedin.pinot.core.io.reader.impl.v2.FixedBitSingleValueReader reader = new com.linkedin.pinot.core.io.reader.impl.v2.FixedBitSingleValueReader(
            heapBuffer, numDocs, numBits, signed);

    if (fullScan) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        ByteBuffer buffer = ByteBuffer.allocateDirect((int) file.length());
        RandomAccessFile raf = new RandomAccessFile(file, "r");
        raf.getChannel().read(buffer);/*from  w  ww.j  ava  2 s .c  o m*/
        raf.close();
        int[] input = new int[numBits];
        int[] output = new int[32];
        int numBatches = (numDocs + 31) / 32;
        for (int run = 0; run < MAX_RUNS; run++) {
            start = System.currentTimeMillis();
            for (int i = 0; i < numBatches; i++) {
                for (int j = 0; j < numBits; j++) {
                    input[j] = buffer.getInt(i * numBits * 4 + j * 4);
                }
                BitPacking.fastunpack(input, 0, output, 0, numBits);
            }
            end = System.currentTimeMillis();
            stats.addValue((end - start));
        }
        System.out.println(" v2 full scan stats for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));
    }
    if (singleRead) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        // sequential read
        for (int run = 0; run < MAX_RUNS; run++) {
            start = System.currentTimeMillis();
            for (int i = 0; i < numDocs; i++) {
                int value = reader.getInt(i);
            }
            end = System.currentTimeMillis();
            stats.addValue((end - start));
        }
        System.out.println(" v2 sequential single read for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));
    }
    if (batchRead) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        int batchSize = Math.min(5000, numDocs);
        int[] output = new int[batchSize];
        int[] rowIds = new int[batchSize];

        // sequential read
        for (int run = 0; run < MAX_RUNS; run++) {
            start = System.currentTimeMillis();
            int rowId = 0;
            while (rowId < numDocs) {
                int length = Math.min(batchSize, numDocs - rowId);
                for (int i = 0; i < length; i++) {
                    rowIds[i] = rowId + i;
                }
                reader.getIntBatch(rowIds, output, length);
                rowId = rowId + length;
            }
            end = System.currentTimeMillis();
            stats.addValue((end - start));
        }
        System.out.println("v2 sequential batch read stats for " + file.getName());
        System.out.println(
                stats.toString().replaceAll("\n", ", ") + " raw:" + Arrays.toString(stats.getValues()));
    }
    reader.close();

}

From source file:Main.java

public static byte[] readFile(File file) throws IOException {
    // Open file// w  w w. j av a2 s.  c  om
    RandomAccessFile f = new RandomAccessFile(file, "r");
    try {
        // Get and check length
        long longlength = f.length();
        int length = (int) longlength;
        if (length != longlength)
            throw new IOException("File size >= 2 GB");
        // Read file and return data
        byte[] data = new byte[length];
        f.readFully(data);
        return data;
    } finally {
        f.close();
    }
}

From source file:org.apache.pig.test.TestJobControlCompiler.java

public static POLoad createPOLoadWithSize(long size, LoadFunc loadFunc) throws Exception {
    File file = File.createTempFile("tempFile", ".tmp");
    file.deleteOnExit();// ww w .  ja  v  a 2  s .c  o  m
    RandomAccessFile f = new RandomAccessFile(file, "rw");
    f.setLength(size);
    f.close();

    loadFunc.setLocation(file.getAbsolutePath(), new org.apache.hadoop.mapreduce.Job(CONF));
    FuncSpec funcSpec = new FuncSpec(loadFunc.getClass().getCanonicalName());
    POLoad poLoad = new POLoad(new OperatorKey(), loadFunc);
    poLoad.setLFile(new FileSpec(file.getAbsolutePath(), funcSpec));
    poLoad.setPc(new PigContext());
    poLoad.setUp();

    return poLoad;
}

From source file:shootersubdownloader.Shootersubdownloader.java

static String computefilehash(File f) throws Exception {
    if (!f.exists() || f.length() < 8 * 1024) {
        return null;
    }//from  www .  ja v  a  2 s. c  o  m
    long l = f.length();
    long[] offset = new long[4];
    offset[3] = l - 8 * 1024;
    offset[2] = l / 3;
    offset[1] = l / 3 * 2;
    offset[0] = 4 * 1024;
    byte[] bBuf = new byte[1024 * 4];
    RandomAccessFile raf = new RandomAccessFile(f, "r");
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 4; i++) {
        raf.seek(offset[i]);
        int readlen = raf.read(bBuf, 0, 4 * 1024);
        String md5 = md5(bBuf);
        if (sb.length() != 0) {
            sb.append("%3B");
        }
        sb.append(md5);
    }
    raf.close();
    return sb.toString();
}

From source file:Main.java

public static String getCPUInfo() {
    RandomAccessFile reader = null;
    try {/*from   www  .j a v  a2 s.  c  o  m*/
        byte[] bs = new byte[1024];
        reader = new RandomAccessFile("/proc/cpuinfo", "r");
        reader.read(bs);
        String ret = new String(bs);
        int index = ret.indexOf(0);
        return index != -1 ? ret.substring(0, index) : ret;
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (reader != null)
                reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return null;
}

From source file:Main.java

public static boolean saveApk(File apk, String savePath) {
    FileInputStream in = null;//from   w  ww .  jav  a 2s  .com
    RandomAccessFile accessFile = null;
    try {
        in = new FileInputStream(apk);
        byte[] buf = new byte[1024 * 4];
        int len;
        File file = new File(savePath);
        accessFile = new RandomAccessFile(file, "rw");
        FileDescriptor fd = accessFile.getFD();
        while ((len = in.read(buf)) != -1) {
            accessFile.write(buf, 0, len);
        }
        fd.sync();
        accessFile.close();
        in.close();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        try {
            if (in != null) {
                in.close();
            }
            if (accessFile != null) {
                accessFile.close();
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return false;
    }
}

From source file:com.amazonaws.eclipse.core.regions.RegionUtils.java

/**
 * Set the length of the file given to 0 bytes.
 *///  w  w w  . ja v a 2 s . c  om
private static void truncateFile(File file) throws FileNotFoundException, IOException {
    if (file.exists()) {
        RandomAccessFile raf = new RandomAccessFile(file, "rw");
        raf.getChannel().truncate(0);
        raf.close();
    }
}