Examples with FileLock java.nio.channels.FileLock used on opensource projects

Example 41 with FileLock

use of java.nio.channels.FileLock in project azure-tools-for-java by Microsoft.

the class FileTokenCache method acquireLock.

private FileLock acquireLock(RandomAccessFile raf) throws IOException, InterruptedException {
    // in case of multiprocess file access
    FileLock lock = null;
    int tryCount = 3;
    long sleepSec = 10;
    while (tryCount > 0) {
        try {
            lock = raf.getChannel().tryLock();
            break;
        } catch (OverlappingFileLockException ex) {
            log.log(Level.WARNING, String.format("The file has been locked by another process - waiting %s sec to release [%d attempt(s) left].", sleepSec, tryCount));
            Thread.sleep(sleepSec * 1000);
            tryCount--;
        }
    }
    return lock;
}

Example 42 with FileLock

use of java.nio.channels.FileLock in project jdk8u_jdk by JetBrains.

the class Sharing method TestMultipleFD.

/**
     * Exercise FileDispatcher close()/preClose()
     */
private static void TestMultipleFD() throws Exception {
    RandomAccessFile raf = null;
    FileOutputStream fos = null;
    FileInputStream fis = null;
    FileChannel fc = null;
    FileLock fileLock = null;
    File test1 = new File("test1");
    try {
        raf = new RandomAccessFile(test1, "rw");
        fos = new FileOutputStream(raf.getFD());
        fis = new FileInputStream(raf.getFD());
        fc = raf.getChannel();
        fileLock = fc.lock();
        raf.setLength(0L);
        fos.flush();
        fos.write("TEST".getBytes());
    } finally {
        if (fileLock != null)
            fileLock.release();
        if (fis != null)
            fis.close();
        if (fos != null)
            fos.close();
        if (raf != null)
            raf.close();
        test1.delete();
    }
    /*
         * Close out in different order to ensure FD is not
         * closed out too early
         */
    File test2 = new File("test2");
    try {
        raf = new RandomAccessFile(test2, "rw");
        fos = new FileOutputStream(raf.getFD());
        fis = new FileInputStream(raf.getFD());
        fc = raf.getChannel();
        fileLock = fc.lock();
        raf.setLength(0L);
        fos.flush();
        fos.write("TEST".getBytes());
    } finally {
        if (fileLock != null)
            fileLock.release();
        if (raf != null)
            raf.close();
        if (fos != null)
            fos.close();
        if (fis != null)
            fis.close();
        test2.delete();
    }
    // one more time, fos first this time
    File test3 = new File("test3");
    try {
        raf = new RandomAccessFile(test3, "rw");
        fos = new FileOutputStream(raf.getFD());
        fis = new FileInputStream(raf.getFD());
        fc = raf.getChannel();
        fileLock = fc.lock();
        raf.setLength(0L);
        fos.flush();
        fos.write("TEST".getBytes());
    } finally {
        if (fileLock != null)
            fileLock.release();
        if (fos != null)
            fos.close();
        if (raf != null)
            raf.close();
        if (fis != null)
            fis.close();
        test3.delete();
    }
}

Example 43 with FileLock

use of java.nio.channels.FileLock in project ABPlayer by winkstu.

the class MiniThumbFile method saveMiniThumbToFile.

protected synchronized void saveMiniThumbToFile(byte[] data, long id, long magic) throws IOException {
    RandomAccessFile r = miniThumbDataFile();
    if (r == null)
        return;
    long pos = id * BYTES_PER_MINTHUMB;
    FileLock lock = null;
    try {
        if (data != null) {
            if (data.length > BYTES_PER_MINTHUMB - HEADER_SIZE)
                return;
            mBuffer.clear();
            mBuffer.put((byte) 1);
            mBuffer.putLong(magic);
            mBuffer.putInt(data.length);
            mBuffer.put(data);
            mBuffer.flip();
            lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, false);
            mChannel.write(mBuffer, pos);
        }
    } catch (IOException ex) {
        Log.e("couldn't save mini thumbnail data for %d; %s", id, ex.getMessage());
        throw ex;
    } catch (RuntimeException ex) {
        Log.e("couldn't save mini thumbnail data for %d, disk full or mount read-only? %s", id, ex.getClass().toString());
    } finally {
        try {
            if (lock != null)
                lock.release();
        } catch (IOException ex) {
        }
    }
}

Example 44 with FileLock

use of java.nio.channels.FileLock in project intellij-community by JetBrains.

the class FileUtilHeavyTest method testDeleteFail.

@Test
public void testDeleteFail() throws IOException {
    File targetDir = IoTestUtil.createTestDir(myTempDirectory, "failed_delete");
    File file = IoTestUtil.createTestFile(targetDir, "file");
    if (SystemInfo.isWindows) {
        try (RandomAccessFile rw = new RandomAccessFile(file, "rw");
            FileLock ignored = rw.getChannel().tryLock()) {
            assertFalse(FileUtil.delete(file));
        }
    } else {
        assertTrue(targetDir.setWritable(false, false));
        try {
            assertFalse(FileUtil.delete(file));
        } finally {
            assertTrue(targetDir.setWritable(true, true));
        }
    }
}

Example 45 with FileLock

use of java.nio.channels.FileLock in project karaf by apache.

the class InstanceHelper method updateInstancePid.

static void updateInstancePid(final File karafHome, final File karafBase, final boolean isStartingInstance) {
    try {
        final String instanceName = System.getProperty("karaf.name");
        final String pid = isStartingInstance ? getPid() : "0";
        if (instanceName != null) {
            String storage = System.getProperty("karaf.instances");
            if (storage == null) {
                throw new Exception("System property 'karaf.instances' is not set. \n" + "This property needs to be set to the full path of the instance.properties file.");
            }
            File storageFile = new File(storage);
            final File propertiesFile = new File(storageFile, "instance.properties");
            if (!propertiesFile.getParentFile().exists()) {
                try {
                    if (!propertiesFile.getParentFile().mkdirs()) {
                        throw new Exception("Unable to create directory " + propertiesFile.getParentFile());
                    }
                } catch (SecurityException se) {
                    throw new Exception(se.getMessage());
                }
            }
            // don't instance.properties if we're stopping and can't acquire lock
            if (!isStartingInstance) {
                boolean proceed = true;
                try (RandomAccessFile raf = new RandomAccessFile(propertiesFile, "rw")) {
                    FileLock lock = raf.getChannel().tryLock();
                    if (lock == null) {
                        proceed = false;
                    } else {
                        lock.release();
                    }
                }
                if (!proceed) {
                    // stopping the child
                    return;
                }
            }
            FileLockUtils.execute(propertiesFile, (TypedProperties props) -> {
                if (props.isEmpty()) {
                    // it's the first instance running, so we consider as root
                    props.put("count", "1");
                    props.put("item.0.name", instanceName);
                    props.put("item.0.loc", karafBase.getAbsolutePath());
                    props.put("item.0.pid", pid);
                    props.put("item.0.root", "true");
                } else {
                    int count = Integer.parseInt(props.get("count").toString());
                    for (int i = 0; i < count; i++) {
                        String name = props.get("item." + i + ".name").toString();
                        if (name.equals(instanceName)) {
                            props.put("item." + i + ".pid", pid);
                            return;
                        }
                    }
                    // it's not found, let assume it's the root instance, so 0
                    props.put("item.0.name", instanceName);
                    props.put("item.0.pid", pid);
                }
            }, true);
        }
    } catch (Exception e) {
        System.err.println("Unable to update instance pid: " + e.getMessage());
    }
}