private void assertEnvIsLocked() {if (!closed.get() && locks != null) {for (Lock lock : locks) {try {lock.ensureValid();} catch (IOException e) {logger.warn("lock assertion failed", e);throw new IllegalStateException("environment is not locked", e);}}}}

    /*** Returns an array of all of the nodes data locations.* @throws IllegalStateException if the node is not configured to store local locations*/public Path[] nodeDataPaths() {assertEnvIsLocked();Path[] paths = new Path[nodePaths.length];for(int i=0;i<paths.length;i++) {paths[i] = nodePaths[i].path;}return paths;}/*** Returns an array of all of the {@link NodePath}s.*/public NodePath[] nodePaths() {assertEnvIsLocked();if (nodePaths == null || locks == null) {throw new IllegalStateException("node is not configured to store local location");}return nodePaths;}public int getNodeLockId() {assertEnvIsLocked();if (nodePaths == null || locks == null) {throw new IllegalStateException("node is not configured to store local location");}return nodeLockId;}/*** Returns all index paths.*/public Path[] indexPaths(Index index) {assertEnvIsLocked();Path[] indexPaths = new Path[nodePaths.length];for (int i = 0; i < nodePaths.length; i++) {indexPaths[i] = nodePaths[i].resolve(index);}return indexPaths;}

 public NodeEnvironment(Settings settings, Environment environment) throws IOException {if (!DiscoveryNode.nodeRequiresLocalStorage(settings)) {nodePaths = null;sharedDataPath = null;locks = null;nodeLockId = -1;nodeMetaData = new NodeMetaData(generateNodeId(settings));logger = Loggers.getLogger(getClass(), Node.addNodeNameIfNeeded(settings, this.nodeMetaData.nodeId()));return;}final NodePath[] nodePaths = new NodePath[environment.dataWithClusterFiles().length];final Lock[] locks = new Lock[nodePaths.length];boolean success = false;        。。。

• org.apache.lucene.store.Lock