/**
	 * Before making calls to an index you have to obtain a lock. The objects
	 * returned by an index become invalid as soon as the indexer writes to the
	 * index. You may obtain nested read locks. Make sure you release the lock.
	 * @see #getLastWriteAccess()
	 * <pre>
	 * index.acquireReadLock();
	 * try {
	 *    ....
	 * } finally {
	 *    index.releaseReadLock();
	 * }
	 * </pre>
	 */
/**
	 * Before making calls to an index you have to obtain a lock. The objects
	 * returned by an index become invalid as soon as the indexer writes to the
	 * index. You may obtain nested read locks. Make sure you release the lock.
	 * @see #getLastWriteAccess()
	 * <pre>
	 * index.acquireReadLock();
	 * try {
	 *    ....
	 * } finally {
	 *    index.releaseReadLock();
	 * }
	 * </pre>
	 */ | IIndex.java