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

Example 46 with FileLock

use of java.nio.channels.FileLock in project android_frameworks_base by crdroidandroid.

the class MiniThumbFile method getMiniThumbFromFile.

/**
     * Gallery app can use this method to retrieve mini-thumbnail. Full size
     * images share the same IDs with their corresponding thumbnails.
     *
     * @param id the ID of the image (same of full size image).
     * @param data the buffer to store mini-thumbnail.
     */
public synchronized byte[] getMiniThumbFromFile(long id, byte[] data) {
    RandomAccessFile r = miniThumbDataFile();
    if (r == null)
        return null;
    long pos = getIndex(id, false);
    if (pos < 0)
        return null;
    pos *= BYTES_PER_MINTHUMB;
    FileLock lock = null;
    try {
        mBuffer.clear();
        lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, true);
        int size = mChannel.read(mBuffer, pos);
        if (size > 1 + 8 + 4) {
            // flag, magic, length
            mBuffer.position(0);
            byte flag = mBuffer.get();
            long magic = mBuffer.getLong();
            int length = mBuffer.getInt();
            if (size >= 1 + 8 + 4 + length && length != 0 && magic != 0 && flag == 1 && data.length >= length) {
                mBuffer.get(data, 0, length);
                return data;
            }
        }
    } catch (IOException ex) {
        Log.w(TAG, "got exception when reading thumbnail id=" + id + ", exception: " + ex);
    } catch (RuntimeException ex) {
        // Other NIO related exception like disk full, read only channel..etc
        Log.e(TAG, "Got exception when reading thumbnail, id = " + id + ", disk full or mount read-only? " + ex.getClass());
    } finally {
        try {
            if (lock != null)
                lock.release();
        } catch (IOException ex) {
        // ignore it.
        }
    }
    return null;
}

Example 47 with FileLock

use of java.nio.channels.FileLock in project ice by JBEI.

the class BlastPlus method rebuildDatabase.

/**
     * Re-builds the blast database, using a lock file to prevent concurrent rebuilds.
     * The lock file has a "life-span" of 1 day after which it is deleted.
     * <p/>
     * Also, a rebuild can be forced even if a lock file exists which is less than a day old
     *
     * @param force set to true to force a rebuild. Use with caution
     * @throws BlastException
     */
public static void rebuildDatabase(boolean force) throws BlastException {
    String blastInstallDir = Utils.getConfigValue(ConfigurationKey.BLAST_INSTALL_DIR);
    if (StringUtils.isEmpty(blastInstallDir)) {
        Logger.warn("Blast install directory not available. Aborting blast rebuild");
        return;
    }
    Path blastDir = Paths.get(blastInstallDir);
    if (!Files.exists(blastDir))
        throw new BlastException("Could not locate Blast installation in " + blastInstallDir);
    String dataDir = Utils.getConfigValue(ConfigurationKey.DATA_DIRECTORY);
    final Path blastFolder = Paths.get(dataDir, BLAST_DB_FOLDER);
    File lockFile = Paths.get(blastFolder.toString(), LOCK_FILE_NAME).toFile();
    if (lockFile.exists()) {
        if (lockFile.lastModified() <= (System.currentTimeMillis() - (1000 * 60 * 60 * 24))) {
            if (!lockFile.delete()) {
                Logger.warn("Could not delete outdated blast lockfile. Delete the following file manually: " + lockFile.getAbsolutePath());
                return;
            }
        } else {
            Logger.info("Blast db locked (lockfile - " + lockFile.getAbsolutePath() + "). Rebuild aborted!");
            return;
        }
    }
    try {
        if (!Files.exists(blastFolder)) {
            Logger.info("Blast folder (" + blastFolder.toString() + ") does not exist. Creating...");
            try {
                Files.createDirectories(blastFolder);
            } catch (Exception e) {
                Logger.warn("Could not create blast folder. Create it manually or all blast runs will fail");
                return;
            }
        }
        if (!force && blastDatabaseExists()) {
            Logger.info("Blast database found in " + blastFolder.toAbsolutePath().toString());
            return;
        }
        if (!lockFile.createNewFile()) {
            Logger.warn("Could not create lock file for blast rebuild");
            return;
        }
        FileOutputStream fos = new FileOutputStream(lockFile);
        try (FileLock lock = fos.getChannel().tryLock()) {
            if (lock == null)
                return;
            Logger.info("Rebuilding blast database");
            rebuildSequenceDatabase(blastDir, blastFolder, false);
            Logger.info("Blast database rebuild complete");
        }
    } catch (OverlappingFileLockException l) {
        Logger.warn("Could not obtain lock file for blast at " + blastFolder.toString());
    } catch (IOException eio) {
        FileUtils.deleteQuietly(lockFile);
        throw new BlastException(eio);
    }
    FileUtils.deleteQuietly(lockFile);
}

Example 48 with FileLock

use of java.nio.channels.FileLock in project ice by JBEI.

the class BlastPlus method rebuildFeaturesBlastDatabase.

public static void rebuildFeaturesBlastDatabase(String featureFolder) throws IOException {
    String blastInstallDir = Utils.getConfigValue(ConfigurationKey.BLAST_INSTALL_DIR);
    if (StringUtils.isEmpty(blastInstallDir)) {
        Logger.warn("Blast install directory not available. Aborting blast features rebuild");
        return;
    }
    Path blastDir = Paths.get(blastInstallDir);
    if (!Files.exists(blastDir))
        throw new IOException("Could not locate Blast installation in " + blastInstallDir);
    String dataDir = Utils.getConfigValue(ConfigurationKey.DATA_DIRECTORY);
    final Path blastFolder = Paths.get(dataDir, featureFolder);
    File lockFile = Paths.get(blastFolder.toString(), LOCK_FILE_NAME).toFile();
    if (lockFile.exists()) {
        if (lockFile.lastModified() <= (System.currentTimeMillis() - (1000 * 60 * 60 * 24)))
            if (!lockFile.delete()) {
                Logger.warn("Could not delete outdated features blast lockfile. Delete the following file manually: " + lockFile.getAbsolutePath());
            } else {
                Logger.info("Features blast db locked (lockfile - " + lockFile.getAbsolutePath() + "). Rebuild aborted!");
                return;
            }
    }
    try {
        if (!Files.exists(blastFolder)) {
            Logger.info("Features blast folder (" + blastFolder.toString() + ") does not exist. Creating...");
            try {
                Files.createDirectories(blastFolder);
            } catch (Exception e) {
                Logger.warn("Could not create features blast folder. Create it manually or all blast features runs will fail");
                return;
            }
        }
        if (!lockFile.createNewFile()) {
            Logger.warn("Could not create lock file for features blast rebuild");
            return;
        }
        FileOutputStream fos = new FileOutputStream(lockFile);
        try (FileLock lock = fos.getChannel().tryLock()) {
            if (lock == null)
                return;
            Logger.info("Rebuilding features blast database...");
            rebuildSequenceDatabase(blastDir, blastFolder, true);
            Logger.info("Blast features database rebuild complete");
        }
    } catch (OverlappingFileLockException l) {
        Logger.warn("Could not obtain lock file for blast at " + blastFolder.toString());
    } catch (BlastException be) {
        FileUtils.deleteQuietly(lockFile);
        Logger.error(be);
    }
    FileUtils.deleteQuietly(lockFile);
}

Example 49 with FileLock

use of java.nio.channels.FileLock in project dubbo by alibaba.

the class AbstractRegistry method doSaveProperties.

public void doSaveProperties(long version) {
    if (version < lastCacheChanged.get()) {
        return;
    }
    if (file == null) {
        return;
    }
    // Save
    try {
        File lockfile = new File(file.getAbsolutePath() + ".lock");
        if (!lockfile.exists()) {
            lockfile.createNewFile();
        }
        RandomAccessFile raf = new RandomAccessFile(lockfile, "rw");
        try {
            FileChannel channel = raf.getChannel();
            try {
                FileLock lock = channel.tryLock();
                if (lock == null) {
                    throw new IOException("Can not lock the registry cache file " + file.getAbsolutePath() + ", ignore and retry later, maybe multi java process use the file, please config: dubbo.registry.file=xxx.properties");
                }
                // Save
                try {
                    if (!file.exists()) {
                        file.createNewFile();
                    }
                    FileOutputStream outputFile = new FileOutputStream(file);
                    try {
                        properties.store(outputFile, "Dubbo Registry Cache");
                    } finally {
                        outputFile.close();
                    }
                } finally {
                    lock.release();
                }
            } finally {
                channel.close();
            }
        } finally {
            raf.close();
        }
    } catch (Throwable e) {
        if (version < lastCacheChanged.get()) {
            return;
        } else {
            registryCacheExecutor.execute(new SaveProperties(lastCacheChanged.incrementAndGet()));
        }
        logger.warn("Failed to save registry store file, cause: " + e.getMessage(), e);
    }
}

Example 50 with FileLock

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

the class DiskStoreImpl method closeLockFile.

void closeLockFile() {
    FileLock myfl = this.fl;
    if (myfl != null) {
        try {
            FileChannel fc = myfl.channel();
            if (myfl.isValid()) {
                myfl.release();
            }
            fc.close();
        } catch (IOException ignore) {
        }
        this.fl = null;
    }
    File f = this.lockFile;
    if (f != null) {
        if (f.delete()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Deleted lock file {}", f);
            }
        } else if (f.exists()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Could not delete lock file {}", f);
            }
        }
    }
    if (logger.isDebugEnabled()) {
        logger.debug("Unlocked disk store {}", name);
    }
}