| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with this |
| * work for additional information regarding copyright ownership. The ASF |
| * licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package org.apache.hadoop.ozone.om; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.hadoop.ozone.om.exceptions.OMException; |
| import org.apache.hadoop.ozone.om.helpers.OmKeyArgs; |
| import org.apache.hadoop.ozone.om.helpers.OzoneFileStatus; |
| import org.apache.hadoop.ozone.security.acl.OzonePrefixPath; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| |
| import static org.apache.hadoop.ozone.om.exceptions.OMException.ResultCodes.KEY_NOT_FOUND; |
| |
| /** |
| * Implementation of OzonePrefixPath interface. |
| */ |
| public class OzonePrefixPathImpl implements OzonePrefixPath { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(OzonePrefixPathImpl.class); |
| private String volumeName; |
| private String bucketName; |
| private KeyManager keyManager; |
| // TODO: based on need can make batchSize configurable. |
| private int batchSize = 1000; |
| private OzoneFileStatus pathStatus; |
| |
| public OzonePrefixPathImpl(String volumeName, String bucketName, |
| String keyPrefix, KeyManager keyManagerImpl) throws IOException { |
| this.volumeName = volumeName; |
| this.bucketName = bucketName; |
| this.keyManager = keyManagerImpl; |
| |
| OmKeyArgs omKeyArgs = new OmKeyArgs.Builder() |
| .setVolumeName(volumeName) |
| .setBucketName(bucketName) |
| .setKeyName(keyPrefix) |
| .setRefreshPipeline(false) |
| .build(); |
| try { |
| pathStatus = keyManager.getFileStatus(omKeyArgs); |
| } catch (OMException ome) { |
| // In existing code non-FSO code, ozone client delete and rename expects |
| // KNF error code. So converting FNF to KEY_NOT_FOUND error code. |
| if (ome.getResult() == OMException.ResultCodes.FILE_NOT_FOUND) { |
| throw new OMException(ome.getMessage(), KEY_NOT_FOUND); |
| } |
| throw ome; |
| } |
| } |
| |
| @Override |
| public OzoneFileStatus getOzoneFileStatus() { |
| return pathStatus; |
| } |
| |
| @Override |
| public Iterator<? extends OzoneFileStatus> getChildren(String keyPrefix) |
| throws IOException { |
| |
| return new PathIterator(keyPrefix); |
| } |
| |
| class PathIterator implements Iterator<OzoneFileStatus> { |
| private Iterator<OzoneFileStatus> currentIterator; |
| private String keyPrefix; |
| private OzoneFileStatus currentValue; |
| |
| /** |
| * Creates an Iterator to iterate over all sub paths of the given keyPrefix. |
| * |
| * @param keyPrefix |
| */ |
| PathIterator(String keyPrefix) throws IOException { |
| this.keyPrefix = keyPrefix; |
| this.currentValue = null; |
| List<OzoneFileStatus> statuses = getNextListOfKeys(""); |
| if (statuses.size() == 1) { |
| OzoneFileStatus keyStatus = statuses.get(0); |
| if (keyStatus.isFile() && StringUtils.equals(keyPrefix, |
| keyStatus.getTrimmedName())) { |
| throw new OMException("Invalid keyPrefix: " + keyPrefix + |
| ", file type is not allowed, expected directory type.", |
| OMException.ResultCodes.INVALID_KEY_NAME); |
| } |
| } |
| this.currentIterator = statuses.iterator(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (!currentIterator.hasNext() && currentValue != null) { |
| String keyName = ""; |
| try { |
| keyName = currentValue.getTrimmedName(); |
| currentIterator = |
| getNextListOfKeys(keyName).iterator(); |
| } catch (IOException e) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Exception while listing keys, keyName:" + keyName, e); |
| } |
| return false; |
| } |
| } |
| return currentIterator.hasNext(); |
| } |
| |
| @Override |
| public OzoneFileStatus next() { |
| if (hasNext()) { |
| currentValue = currentIterator.next(); |
| return currentValue; |
| } |
| throw new NoSuchElementException(); |
| } |
| |
| /** |
| * Gets the next set of key list using keyManager OM interface. |
| * |
| * @param prevKey |
| * @return {@code List<OzoneFileStatus>} |
| */ |
| List<OzoneFileStatus> getNextListOfKeys(String prevKey) throws |
| IOException { |
| |
| OmKeyArgs omKeyArgs = new OmKeyArgs.Builder() |
| .setVolumeName(volumeName) |
| .setBucketName(bucketName) |
| .setKeyName(keyPrefix) |
| .setRefreshPipeline(false) |
| .build(); |
| |
| List<OzoneFileStatus> statuses = keyManager.listStatus(omKeyArgs, false, |
| prevKey, batchSize); |
| |
| // ListStatuses with non-null startKey will add startKey as first element |
| // in the resultList. Remove startKey element as it is duplicated one. |
| if (!statuses.isEmpty() && StringUtils.equals(prevKey, |
| statuses.get(0).getTrimmedName())) { |
| statuses.remove(0); |
| } |
| return statuses; |
| } |
| } |
| } |