Example usage for org.apache.lucene.store Lock Lock

Introduction

In this page you can find the example usage for org.apache.lucene.store Lock Lock.

Prototype

Lock

Source Link

Usage

From source file:cc.solr.lucene.store.lock.BlurLockFactory.java

License:Apache License

@Override
public Lock makeLock(String lockName) {
    final Path lockPath = new Path(_dir, lockName);
    return new Lock() {
        private boolean _set;

        @Override/*from w  w w .  j av a  2  s .  com*/
        public boolean obtain() throws IOException {
            if (_set) {
                throw new IOException("Lock for [" + _baseLockKey + "] can only be set once.");
            }
            try {
                _lockKey = (_baseLockKey + "/" + System.currentTimeMillis()).getBytes();
                FSDataOutputStream outputStream = _fileSystem.create(lockPath, true);
                outputStream.write(_lockKey);
                outputStream.close();
            } finally {
                _set = true;
            }
            return true;
        }

        @Override
        public void release() throws IOException {
            _fileSystem.delete(lockPath, false);
        }

        @Override
        public boolean isLocked() throws IOException {
            if (!_set) {
                return false;
            }
            if (!_fileSystem.exists(lockPath)) {
                return false;
            }
            FileStatus fileStatus = _fileSystem.getFileStatus(lockPath);
            long len = fileStatus.getLen();
            if (len != _lockKey.length) {
                return false;
            }
            byte[] buf = new byte[_lockKey.length];
            FSDataInputStream inputStream = _fileSystem.open(lockPath);
            inputStream.readFully(buf);
            inputStream.close();
            if (Arrays.equals(_lockKey, buf)) {
                return true;
            }
            return false;
        }
    };
}

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From source file:cc.wikitools.lucene.hadoop.FileSystemDirectory.java

License:Apache License

public Lock makeLock(final String name) {
    return new Lock() {
        public boolean obtain() {
            return true;
        }//www  . j  a va 2  s. c  o  m

        public void release() {
        }

        public boolean isLocked() {
            throw new UnsupportedOperationException();
        }

        public String toString() {
            return "Lock@" + new Path(directory, name);
        }
    };
}

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From source file:com.bah.lucene.hdfs.BlurLockFactory.java

License:Apache License

@Override
public Lock makeLock(String lockName) {
    final Path lockPath = new Path(_dir, lockName);
    return new Lock() {
        private boolean _set;

        @Override//from  w  w  w.  j ava2 s .co m
        public boolean obtain() throws IOException {
            if (_set) {
                throw new IOException("Lock for [" + _baseLockKey + "] can only be set once.");
            }
            try {
                _lockKey = (_baseLockKey + "/" + System.currentTimeMillis()).getBytes();
                FSDataOutputStream outputStream = _fileSystem.create(lockPath, true);
                outputStream.write(_lockKey);
                outputStream.close();
            } finally {
                _set = true;
            }
            return true;
        }

        @Override
        public void release() throws IOException {
            _fileSystem.delete(lockPath, false);
        }

        @Override
        public boolean isLocked() throws IOException {
            if (!_set) {
                LOG.info("The lock has NOT been set.");
                return false;
            }
            if (!_fileSystem.exists(lockPath)) {
                LOG.info("The lock file has been removed.");
                return false;
            }
            FileStatus fileStatus = _fileSystem.getFileStatus(lockPath);
            long len = fileStatus.getLen();
            if (len != _lockKey.length) {
                LOG.info("The lock file length has changed.");
                return false;
            }
            byte[] buf = new byte[_lockKey.length];
            FSDataInputStream inputStream = _fileSystem.open(lockPath);
            inputStream.readFully(buf);
            inputStream.close();
            if (Arrays.equals(_lockKey, buf)) {
                return true;
            }
            LOG.info("The lock information has been changed.");
            return false;
        }
    };
}

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From source file:com.svenjacobs.lugaene.GaeLockFactory.java

License:Apache License

@Override
public Lock makeLock(final String lockName) {

    return new Lock() {
        @Override//from w  w w.  j a  v a2s .c om
        public boolean obtain() throws IOException {
            GaeLockEntity lock = loadLock(lockName);

            if (lock != null) {
                if (lock.locked) {
                    return false;
                }

                lock.locked = true;
                ofy().save().entity(lock).now();

                return true;
            } else {
                lock = new GaeLockEntity(directory, lockName);
                lock.locked = true;
                ofy().save().entity(lock).now();
                return true;
            }
        }

        @Override
        public void release() throws IOException {
            final GaeLockEntity lock = loadLock(lockName);

            if (lock != null) {
                lock.locked = false;
                ofy().save().entity(lock).now();
            }
        }

        @Override
        public boolean isLocked() throws IOException {
            final GaeLockEntity lock = loadLock(lockName);
            return lock != null && lock.locked;
        }
    };
}

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From source file:com.xiaomi.linden.hadoop.indexing.reduce.FileSystemDirectory.java

License:Apache License

@Override
public Lock makeLock(final String name) {
    return new Lock() {
        @Override/*from  w ww  .ja v a2 s.c o m*/
        public boolean obtain() {
            return true;
        }

        @Override
        public void close() throws IOException {
        }

        @Override
        public boolean isLocked() {
            throw new UnsupportedOperationException();
        }

        @Override
        public String toString() {
            return "Lock@" + new Path(directory, name);
        }
    };
}

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From source file:org.apache.blur.index.OptimisticLockFactory.java

License:Apache License

@Override
public Lock makeLock(String lockName) {
    final Path lockPath = new Path(_dir, lockName);
    return new Lock() {
        private boolean _set;

        @Override/*from ww w.j  a v a2s. c  o m*/
        public boolean obtain() throws IOException {
            Tracer trace = Trace.trace("filesystem - release", Trace.param("lockPath", lockPath));
            try {
                if (_set) {
                    throw new IOException("Lock for [" + _baseLockKey + "] can only be set once.");
                }
                try {
                    _lockKey = (_baseLockKey + "/" + System.currentTimeMillis()).getBytes();
                    FSDataOutputStream outputStream = _fileSystem.create(lockPath, true);
                    outputStream.write(_lockKey);
                    outputStream.close();
                } finally {
                    _set = true;
                }
                return true;
            } finally {
                trace.done();
            }
        }

        @Override
        public void release() throws IOException {
            Tracer trace = Trace.trace("filesystem - release", Trace.param("lockPath", lockPath));
            try {
                _fileSystem.delete(lockPath, false);
            } finally {
                trace.done();
            }
        }

        @Override
        public boolean isLocked() throws IOException {
            Tracer trace = Trace.trace("filesystem - isLocked", Trace.param("lockPath", lockPath));
            try {
                if (!_set) {
                    return false;
                }
                if (!_fileSystem.exists(lockPath)) {
                    return false;
                }
                FileStatus fileStatus = _fileSystem.getFileStatus(lockPath);
                long len = fileStatus.getLen();
                if (len != _lockKey.length) {
                    return false;
                }
                byte[] buf = new byte[_lockKey.length];
                FSDataInputStream inputStream = _fileSystem.open(lockPath);
                inputStream.readFully(buf);
                inputStream.close();
                if (Arrays.equals(_lockKey, buf)) {
                    return true;
                }
                return false;
            } finally {
                trace.done();
            }
        }
    };
}

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From source file:org.apache.mahout.text.ReadOnlyFileSystemDirectory.java

License:Apache License

@Override
public Lock makeLock(final String name) {
    return new Lock() {
        public boolean obtain() {
            return true;
        }//from   w w  w . j a v  a  2s.  c  om

        public void release() {
        }

        public boolean isLocked() {
            throw new UnsupportedOperationException();
        }

        public String toString() {
            return "Lock@" + new Path(directory, name);
        }
    };
}

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From source file:org.apache.nutch.indexer.FsDirectory.java

License:Apache License

public Lock makeLock(final String name) {
    return new Lock() {
        public boolean obtain() {
            try {
                fs.lock(new Path(directory, name), false);
                return true;
            } catch (IOException e) {
                return false;
            }//from w  ww.ja v  a 2  s  . c  om
        }

        public void release() {
            try {
                fs.release(new Path(directory, name));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        public boolean isLocked() {
            throw new UnsupportedOperationException();
        }

        public String toString() {
            return "Lock@" + new Path(directory, name);
        }
    };
}

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