| /* |
| * 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.carbondata.core.datastore.impl; |
| |
| import org.apache.carbondata.common.logging.LogServiceFactory; |
| import org.apache.carbondata.core.constants.CarbonCommonConstants; |
| import org.apache.carbondata.core.datastore.filesystem.AlluxioCarbonFile; |
| import org.apache.carbondata.core.datastore.filesystem.CarbonFile; |
| import org.apache.carbondata.core.datastore.filesystem.HDFSCarbonFile; |
| import org.apache.carbondata.core.datastore.filesystem.LocalCarbonFile; |
| import org.apache.carbondata.core.datastore.filesystem.S3CarbonFile; |
| import org.apache.carbondata.core.datastore.filesystem.ViewFSCarbonFile; |
| import org.apache.carbondata.core.util.CarbonProperties; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.log4j.Logger; |
| |
| /** |
| * FileType provider to create CarbonFile specific to the file system where the path belongs to. |
| */ |
| public class DefaultFileTypeProvider implements FileTypeInterface { |
| |
| private static final Logger LOGGER = |
| LogServiceFactory.getLogService(DefaultFileTypeProvider.class.getName()); |
| |
| /** |
| * Custom file type provider for supporting non default file systems. |
| */ |
| protected FileTypeInterface customFileTypeProvider = null; |
| |
| protected Boolean customFileTypeProviderInitialized = false; |
| |
| private final Object lock = new Object(); |
| |
| public DefaultFileTypeProvider() { |
| } |
| |
| /** |
| * This method is required apart from Constructor to handle the below circular dependency. |
| * CarbonProperties-->FileFactory-->DefaultTypeProvider-->CarbonProperties |
| */ |
| private void initializeCustomFileProvider() { |
| if (!customFileTypeProviderInitialized) { |
| // This initialization can happen in concurrent threads. |
| synchronized (lock) { |
| if (!customFileTypeProviderInitialized) { |
| String customFileProvider = CarbonProperties.getInstance() |
| .getProperty(CarbonCommonConstants.CUSTOM_FILE_PROVIDER); |
| if (customFileProvider != null && !customFileProvider.trim().isEmpty()) { |
| try { |
| customFileTypeProvider = |
| (FileTypeInterface) Class.forName(customFileProvider).newInstance(); |
| } catch (Exception e) { |
| LOGGER.error("Unable load configured FileTypeInterface class. Ignored.", e); |
| } |
| customFileTypeProviderInitialized = true; |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Delegate to the custom file provider to check if the path is supported or not. |
| * Note this function do not check the default supported file systems as #getCarbonFile expects |
| * this method output is from customFileTypeProvider. |
| * |
| * @param path path of the file |
| * @return true if supported by the custom |
| */ |
| @Override |
| public boolean isPathSupported(String path) { |
| initializeCustomFileProvider(); |
| if (customFileTypeProvider != null) { |
| return customFileTypeProvider.isPathSupported(path); |
| } |
| return false; |
| } |
| |
| public CarbonFile getCarbonFile(String path, Configuration conf) { |
| // Handle the custom file type first |
| if (isPathSupported(path)) { |
| return customFileTypeProvider.getCarbonFile(path, conf); |
| } |
| |
| FileFactory.FileType fileType = FileFactory.getFileType(path); |
| switch (fileType) { |
| case LOCAL: |
| return new LocalCarbonFile(FileFactory.getUpdatedFilePath(path)); |
| case HDFS: |
| case HDFS_LOCAL: |
| return new HDFSCarbonFile(path, conf); |
| case S3: |
| return new S3CarbonFile(path, conf); |
| case ALLUXIO: |
| return new AlluxioCarbonFile(path); |
| case VIEWFS: |
| return new ViewFSCarbonFile(path); |
| default: |
| return new LocalCarbonFile(FileFactory.getUpdatedFilePath(path)); |
| } |
| } |
| } |