Examples with LockException org.exist.util.LockException used on opensource projects

Example 31 with LockException

use of org.exist.util.LockException in project exist by eXist-db.

the class GetIndex method eval.

@Override
public Sequence eval(final Sequence[] args, final Sequence contextSequence) throws XPathException {
    if (args[1].isEmpty())
        return Sequence.EMPTY_SEQUENCE;
    final String id = args[0].getStringValue();
    final NodeProxy node = (NodeProxy) args[1].itemAt(0);
    final SortIndexWorker index = (SortIndexWorker) context.getBroker().getIndexController().getWorkerByIndexId(SortIndex.ID);
    long pos = 0;
    try {
        pos = index.getIndex(id, node);
    } catch (final EXistException e) {
        throw new XPathException(this, e.getMessage(), e);
    } catch (final LockException e) {
        throw new XPathException(this, "Caught lock error while searching index. Giving up.", e);
    }
    return pos < 0 ? Sequence.EMPTY_SEQUENCE : new IntegerValue(pos, Type.LONG);
}

Example 32 with LockException

use of org.exist.util.LockException in project exist by eXist-db.

the class LockManager method acquireBtreeReadLock.

/**
 * Acquire a WRITE_LOCK on a {@link org.exist.storage.btree.BTree}
 *
 * @param btreeFileName the filename of the BTree
 *
 * @return the lock for the BTree
 *
 * @throws LockException if the lock could not be acquired
 */
public ManagedLock<ReentrantLock> acquireBtreeReadLock(final String btreeFileName) throws LockException {
    final long groupId = System.nanoTime();
    final ReentrantLock lock = getBTreeLock(btreeFileName);
    try {
        lockTable.attempt(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.READ_LOCK);
        lock.lockInterruptibly();
        lockTable.acquired(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.READ_LOCK);
    } catch (final InterruptedException e) {
        lockTable.attemptFailed(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.READ_LOCK);
        throw new LockException("Unable to acquire READ_LOCK for: " + btreeFileName, e);
    }
    return new ManagedLock(lock, () -> {
        lock.unlock();
        lockTable.released(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.READ_LOCK);
    });
}

Example 33 with LockException

use of org.exist.util.LockException in project exist by eXist-db.

the class LockManager method acquireBtreeWriteLock.

/**
 * Acquire a WRITE_LOCK on a {@link org.exist.storage.btree.BTree}
 *
 * @param btreeFileName the filename of the BTree
 *
 * @return the lock for the BTree
 *
 * @throws LockException if the lock could not be acquired
 */
public ManagedLock<ReentrantLock> acquireBtreeWriteLock(final String btreeFileName) throws LockException {
    final long groupId = System.nanoTime();
    final ReentrantLock lock = getBTreeLock(btreeFileName);
    try {
        lockTable.attempt(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.WRITE_LOCK);
        lock.lockInterruptibly();
        lockTable.acquired(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.WRITE_LOCK);
    } catch (final InterruptedException e) {
        lockTable.attemptFailed(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.WRITE_LOCK);
        throw new LockException("Unable to acquire WRITE_LOCK for: " + btreeFileName, e);
    }
    return new ManagedLock(lock, () -> {
        lock.unlock();
        lockTable.released(groupId, btreeFileName, LockType.BTREE, Lock.LockMode.WRITE_LOCK);
    });
}

Example 34 with LockException

use of org.exist.util.LockException in project exist by eXist-db.

the class LockManager method acquirePathWriteLock.

/**
 * Acquires a WRITE_LOCK on a path (and implicitly all descendant paths).
 *
 * @param path The path for which a lock is requested.
 * @param lockParent true if we should also explicitly write lock the parent path.
 *
 * @return A WRITE_LOCK on the path.
 */
LockGroup acquirePathWriteLock(final LockType lockType, final XmldbURI path, final boolean lockParent) throws LockException {
    final XmldbURI[] segments = path.getPathSegments();
    final long groupId = System.nanoTime();
    String pathStr = "";
    final Tuple3<MultiLock, Lock.LockMode, String>[] locked = new Tuple3[segments.length];
    for (int i = 0; i < segments.length; i++) {
        pathStr += '/' + segments[i].toString();
        final Lock.LockMode lockMode;
        if (lockParent && i + 2 == segments.length) {
            // parent
            lockMode = Lock.LockMode.WRITE_LOCK;
        } else if (i + 1 == segments.length) {
            // leaf
            lockMode = Lock.LockMode.WRITE_LOCK;
        } else {
            if (!pathsMultiWriter) {
                // single-writer/multi-reader
                lockMode = Lock.LockMode.WRITE_LOCK;
            } else {
                // multi-writer/multi-reader
                lockMode = Lock.LockMode.INTENTION_WRITE;
            }
        }
        final MultiLock lock = getPathLock(pathStr);
        if (upgradeCheck && lockMode == Lock.LockMode.WRITE_LOCK && (lock.getIntentionReadHoldCount() > 0 || lock.getReadHoldCount() > 0)) {
            throw new LockException("Lock upgrading would lead to a self-deadlock: " + pathStr);
        }
        if (warnWaitOnReadForWrite && lockMode == Lock.LockMode.WRITE_LOCK) {
            if (lock.getIntentionReadLockCount() > 0) {
                LOG.warn("About to acquire WRITE_LOCK for: {}, but INTENTION_READ_LOCK held by other thread(s): ", pathStr);
            } else if (lock.getReadLockCount() > 0) {
                LOG.warn("About to acquire WRITE_LOCK for: {}, but READ_LOCK held by other thread(s): ", pathStr);
            }
        }
        lockTable.attempt(groupId, pathStr, lockType, lockMode);
        if (lock(lock, lockMode)) {
            locked[i] = new Tuple3<>(lock, lockMode, pathStr);
            lockTable.acquired(groupId, pathStr, lockType, lockMode);
        } else {
            lockTable.attemptFailed(groupId, pathStr, lockType, lockMode);
            unlockAll(locked, l -> lockTable.released(groupId, l._3, lockType, l._2));
            throw new LockException("Unable to acquire " + lockType + " " + lockMode + " for: " + pathStr);
        }
    }
    return new LockGroup(groupId, locked);
}

Example 35 with LockException

use of org.exist.util.LockException in project exist by eXist-db.

the class LockManager method acquirePathReadLock.

/**
 * Acquires a READ_LOCK on a database path (and implicitly all descendant paths).
 *
 * @param lockType The type of the lock
 * @param path The path for which a lock is requested.
 *
 * @return A READ_LOCK on the Collection.
 *
 * @throws LockException if a lock error occurs
 */
public LockGroup acquirePathReadLock(final LockType lockType, final XmldbURI path) throws LockException {
    final XmldbURI[] segments = path.getPathSegments();
    final long groupId = System.nanoTime();
    String pathStr = "";
    final Tuple3<MultiLock, Lock.LockMode, String>[] locked = new Tuple3[segments.length];
    for (int i = 0; i < segments.length; i++) {
        pathStr += '/' + segments[i].toString();
        final Lock.LockMode lockMode;
        if (i + 1 == segments.length) {
            // leaf
            lockMode = Lock.LockMode.READ_LOCK;
        } else {
            // ancestor
            lockMode = Lock.LockMode.INTENTION_READ;
        }
        final MultiLock lock = getPathLock(pathStr);
        lockTable.attempt(groupId, pathStr, lockType, lockMode);
        if (lock(lock, lockMode)) {
            locked[i] = new Tuple3<>(lock, lockMode, pathStr);
            lockTable.acquired(groupId, pathStr, lockType, lockMode);
        } else {
            lockTable.attemptFailed(groupId, pathStr, lockType, lockMode);
            unlockAll(locked, l -> lockTable.released(groupId, l._3, lockType, l._2));
            throw new LockException("Unable to acquire " + lockType + " " + lockMode + " for: " + pathStr);
        }
    }
    return new LockGroup(groupId, locked);
}