content: /*
   * 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.asterix.external.provider;
  
  import java.io.IOException;
  import java.util.Map;
  
  import org.apache.asterix.common.exceptions.AsterixException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.common.exceptions.RuntimeDataException;
  import org.apache.asterix.external.api.AsterixInputStream;
  import org.apache.asterix.external.api.IDataFlowController;
  import org.apache.asterix.external.api.IDataParserFactory;
  import org.apache.asterix.external.api.IExternalDataRuntimeContext;
  import org.apache.asterix.external.api.IExternalDataSourceFactory;
  import org.apache.asterix.external.api.IInputStreamFactory;
  import org.apache.asterix.external.api.IRecordDataParser;
  import org.apache.asterix.external.api.IRecordDataParserFactory;
  import org.apache.asterix.external.api.IRecordReader;
  import org.apache.asterix.external.api.IRecordReaderFactory;
  import org.apache.asterix.external.api.IRecordWithMetadataParser;
  import org.apache.asterix.external.api.IRecordWithPKDataParser;
  import org.apache.asterix.external.api.IStreamDataParser;
  import org.apache.asterix.external.api.IStreamDataParserFactory;
  import org.apache.asterix.external.dataflow.ChangeFeedDataFlowController;
  import org.apache.asterix.external.dataflow.ChangeFeedWithMetaDataFlowController;
  import org.apache.asterix.external.dataflow.FeedRecordDataFlowController;
  import org.apache.asterix.external.dataflow.FeedStreamDataFlowController;
  import org.apache.asterix.external.dataflow.FeedWithMetaDataFlowController;
  import org.apache.asterix.external.dataflow.RecordDataFlowController;
  import org.apache.asterix.external.dataflow.StreamDataFlowController;
  import org.apache.asterix.external.util.ExternalDataUtils;
  import org.apache.asterix.external.util.IFeedLogManager;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  public class DataflowControllerProvider {
  
      private DataflowControllerProvider() {
      }
  
      // TODO: Instead, use a factory just like data source and data parser.
      @SuppressWarnings({ "rawtypes", "unchecked" })
      public static IDataFlowController getDataflowController(ARecordType recordType, IHyracksTaskContext ctx,
              int partition, IExternalDataSourceFactory dataSourceFactory, IDataParserFactory dataParserFactory,
              Map<String, String> configuration, boolean isFeed, IFeedLogManager feedLogManager)
              throws HyracksDataException {
          IExternalDataRuntimeContext runtimeContext = dataSourceFactory.createExternalDataRuntimeContext(ctx, partition);
          try {
              switch (dataSourceFactory.getDataSourceType()) {
                  case RECORDS:
                      IRecordReaderFactory<?> recordReaderFactory = (IRecordReaderFactory<?>) dataSourceFactory;
                      IRecordReader<?> recordReader = recordReaderFactory.createRecordReader(runtimeContext);
                      IRecordDataParserFactory<?> recordParserFactory = (IRecordDataParserFactory<?>) dataParserFactory;
                      IRecordDataParser<?> dataParser = recordParserFactory.createRecordParser(runtimeContext);
                      if (isFeed) {
                          boolean isChangeFeed = ExternalDataUtils.isChangeFeed(configuration);
                          boolean isRecordWithMeta = ExternalDataUtils.isRecordWithMeta(configuration);
                          if (isRecordWithMeta) {
                              if (isChangeFeed) {
                                  int numOfKeys = ExternalDataUtils.getNumberOfKeys(configuration);
                                  return new ChangeFeedWithMetaDataFlowController(ctx, feedLogManager, numOfKeys + 2,
                                          (IRecordWithMetadataParser) dataParser, recordReader);
                              } else {
                                  return new FeedWithMetaDataFlowController(ctx, feedLogManager, 2,
                                          (IRecordWithMetadataParser) dataParser, recordReader);
                              }
                          } else if (isChangeFeed) {
                              int numOfKeys = ExternalDataUtils.getNumberOfKeys(configuration);
                              return new ChangeFeedDataFlowController(ctx, feedLogManager, numOfKeys + 1,
                                      (IRecordWithPKDataParser) dataParser, recordReader);
                          } else {
                              return new FeedRecordDataFlowController(ctx, feedLogManager, 1, dataParser, recordReader);
                          }
                      } else {
                          return new RecordDataFlowController(ctx, dataParser, recordReader, 1);
                      }
                  case STREAM:
                      IInputStreamFactory streamFactory = (IInputStreamFactory) dataSourceFactory;
                      AsterixInputStream stream = streamFactory.createInputStream(runtimeContext);
                      IStreamDataParserFactory streamParserFactory = (IStreamDataParserFactory) dataParserFactory;
                      // TODO(ali): revisit to think about passing data source name to parser
                      IStreamDataParser streamParser = streamParserFactory.createInputStreamParser(runtimeContext);
                      streamParser.setInputStream(stream);
                      if (isFeed) {
                          return new FeedStreamDataFlowController(ctx, feedLogManager, streamParser, stream);
                      } else {
                          return new StreamDataFlowController(ctx, streamParser);
                      }
                  default:
                      throw new RuntimeDataException(ErrorCode.PROVIDER_DATAFLOW_CONTROLLER_UNKNOWN_DATA_SOURCE,
                              dataSourceFactory.getDataSourceType());
              }
          } catch (IOException | AsterixException e) {
              throw HyracksDataException.create(e);
          }
      }
  }
  