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.input.record.reader.stream;
  
  import java.io.IOException;
  import java.lang.reflect.InvocationTargetException;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.asterix.common.exceptions.AsterixException;
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.common.external.IExternalFilterEvaluatorFactory;
  import org.apache.asterix.external.api.IExternalDataRuntimeContext;
  import org.apache.asterix.external.api.IInputStreamFactory;
  import org.apache.asterix.external.api.IRecordReader;
  import org.apache.asterix.external.api.IRecordReaderFactory;
  import org.apache.asterix.external.input.filter.embedder.IExternalFilterValueEmbedder;
  import org.apache.asterix.external.input.stream.factory.LocalFSInputStreamFactory;
  import org.apache.asterix.external.input.stream.factory.SocketClientInputStreamFactory;
  import org.apache.asterix.external.input.stream.factory.SocketServerInputStreamFactory;
  import org.apache.asterix.external.provider.StreamRecordReaderProvider;
  import org.apache.asterix.external.provider.context.ExternalReaderRuntimeDataContext;
  import org.apache.asterix.external.util.ExternalDataConstants;
  import org.apache.hyracks.algebricks.common.constraints.AlgebricksAbsolutePartitionConstraint;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.api.application.IServiceContext;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  
  public class StreamRecordReaderFactory implements IRecordReaderFactory<Object> {
  
      private static final long serialVersionUID = 1L;
      protected IInputStreamFactory streamFactory;
      protected Map<String, String> configuration;
      protected Class<?> recordReaderClazz;
      protected IExternalFilterEvaluatorFactory filterEvaluatorFactory;
      private static final List<String> recordReaderNames =
              Collections.unmodifiableList(Arrays.asList(ExternalDataConstants.ALIAS_LOCALFS_ADAPTER,
                      ExternalDataConstants.KEY_ALIAS_ADAPTER_NAME_SOCKET, ExternalDataConstants.KEY_ADAPTER_NAME_SOCKET,
                      ExternalDataConstants.STREAM_SOCKET_CLIENT));
  
      @Override
      public final DataSourceType getDataSourceType() {
          return DataSourceType.RECORDS;
      }
  
      @Override
      public final Class<?> getRecordClass() throws AsterixException {
          return StreamRecordReaderProvider.getRecordClass(configuration);
      }
  
      @Override
      public final AlgebricksAbsolutePartitionConstraint getPartitionConstraint() throws AlgebricksException {
          return streamFactory.getPartitionConstraint();
      }
  
      @Override
      public final void configure(IServiceContext serviceCtx, Map<String, String> configuration,
              IWarningCollector warningCollector, IExternalFilterEvaluatorFactory filterEvaluatorFactory)
              throws HyracksDataException, AlgebricksException {
          this.configuration = configuration;
          setStreamFactory(configuration);
          streamFactory.configure(serviceCtx, configuration, warningCollector, filterEvaluatorFactory);
          recordReaderClazz = StreamRecordReaderProvider.getRecordReaderClazz(configuration);
          this.filterEvaluatorFactory = filterEvaluatorFactory;
      }
  
      @Override
      public final IRecordReader<?> createRecordReader(IExternalDataRuntimeContext context) throws HyracksDataException {
          AbstractStreamRecordReader<?> reader = createReader(context);
          ((ExternalReaderRuntimeDataContext) context).setReader(reader);
          return reader;
      }
  
      @Override
      public final IExternalDataRuntimeContext createExternalDataRuntimeContext(IHyracksTaskContext context,
              int partition) throws HyracksDataException {
          IExternalFilterValueEmbedder valueEmbedder =
                  filterEvaluatorFactory.createValueEmbedder(context.getWarningCollector());
          return new ExternalReaderRuntimeDataContext(context, partition, valueEmbedder);
      }
  
      @Override
      public List<String> getRecordReaderNames() {
          return recordReaderNames;
      }
  
      protected void setStreamFactory(Map<String, String> config) throws CompilationException {
          String reader = config.get(ExternalDataConstants.KEY_READER);
          if (reader.equals(ExternalDataConstants.ALIAS_LOCALFS_ADAPTER)) {
              streamFactory = new LocalFSInputStreamFactory();
          } else if (reader.equals(ExternalDataConstants.KEY_ALIAS_ADAPTER_NAME_SOCKET)
                  || reader.equals(ExternalDataConstants.KEY_ADAPTER_NAME_SOCKET)) {
              streamFactory = new SocketServerInputStreamFactory();
          } else if (reader.equals(ExternalDataConstants.STREAM_SOCKET_CLIENT)) {
              streamFactory = new SocketClientInputStreamFactory();
          } else {
              throw new CompilationException(ErrorCode.FEED_UNKNOWN_ADAPTER_NAME);
          }
      }
  
      @SuppressWarnings("unchecked")
      private AbstractStreamRecordReader<?> createReader(IExternalDataRuntimeContext context)
              throws HyracksDataException {
          try {
              AbstractStreamRecordReader<?> streamRecordReader;
              if (recordReaderClazz.equals(AvroRecordReader.class)) {
                  streamRecordReader = new AvroRecordReader(streamFactory.createInputStream(context), configuration);
              } else {
                  streamRecordReader = (AbstractStreamRecordReader<?>) recordReaderClazz.getConstructor().newInstance();
              }
              streamRecordReader.configure(context.getTaskContext(), streamFactory.createInputStream(context),
                      configuration);
              return streamRecordReader;
          } catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException
                  | IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  }