Method pin

basex-core/src/main/java/org/basex/core/locks/Locking.java:186–193

Pins a lock string. Creates a new lock if necessary. @param string lock string @return lock

(final String string)

   * @return lock
   */
  private LocalReadWriteLock pin(final String string) {
    synchronized(localLocks) {
      final LocalReadWriteLock lock = localLocks.computeIfAbsent(string,
          k -> new LocalReadWriteLock(fair));
      lock.pin();
      return lock;
    }
  }

  /**
   * Unpins a lock string. Removes a lock if pin count is zero.