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.dataflow;
  
  import java.io.Closeable;
  import java.io.IOException;
  
  import org.apache.asterix.active.message.ActiveManagerMessage;
  import org.apache.asterix.external.api.IDataFlowController;
  import org.apache.asterix.external.util.IFeedLogManager;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
  
  public abstract class AbstractFeedDataFlowController implements IDataFlowController, Closeable {
      protected TupleForwarder tupleForwarder;
      protected final IHyracksTaskContext ctx;
      protected final int numOfFields;
      protected final ArrayTupleBuilder tb;
      protected final IFeedLogManager feedLogManager;
      protected boolean flushing;
      protected long incomingRecordsCount = 0;
  
      public AbstractFeedDataFlowController(IHyracksTaskContext ctx, IFeedLogManager feedLogManager, int numOfFields) {
          this.feedLogManager = feedLogManager;
          this.numOfFields = numOfFields;
          this.ctx = ctx;
          this.tb = new ArrayTupleBuilder(numOfFields);
      }
  
      @Override
      public void flush() throws HyracksDataException {
          flushing = true;
          tupleForwarder.flush();
          flushing = false;
      }
  
      public long getIncomingRecordsCount() {
          return incomingRecordsCount;
      }
  
      public abstract String getStats();
  
      @Override
      public void close() throws IOException {
          if (feedLogManager != null) {
              feedLogManager.close();
          }
      }
  
      public void handleGenericEvent(ActiveManagerMessage event) {
          throw new IllegalStateException("unexpected generic event " + event);
      }
  }
  