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 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.IStreamDataParser;
  import org.apache.asterix.external.util.IFeedLogManager;
  import org.apache.hyracks.api.comm.IFrameWriter;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.storage.am.common.api.ITupleFilter;
  
  public class FeedStreamDataFlowController extends AbstractFeedDataFlowController {
  
      private final IStreamDataParser dataParser;
      private final AsterixInputStream stream;
  
      public FeedStreamDataFlowController(IHyracksTaskContext ctx, IFeedLogManager feedLogManager,
              IStreamDataParser streamParser, AsterixInputStream inputStream) {
          super(ctx, feedLogManager, 1);
          this.dataParser = streamParser;
          this.stream = inputStream;
      }
  
      @Override
      public void start(IFrameWriter writer, ITupleFilter tupleFilter, long outputLimit) throws HyracksDataException {
          if (tupleFilter != null || outputLimit >= 0) {
              throw new RuntimeDataException(ErrorCode.DATAFLOW_ILLEGAL_STATE);
          }
          try {
              tupleForwarder = new TupleForwarder(ctx, writer);
              while (true) {
                  if (!parseNext()) {
                      break;
                  }
                  tb.addFieldEndOffset();
                  tupleForwarder.addTuple(tb);
                  incomingRecordsCount++;
              }
              tupleForwarder.complete();
          } catch (Throwable e) {
              throw HyracksDataException.create(e);
          }
      }
  
      private boolean parseNext() throws HyracksDataException {
          while (true) {
              try {
                  tb.reset();
                  return dataParser.parse(tb.getDataOutput());
              } catch (Exception e) {
                  if (!handleException(e)) {
                      throw e;
                  }
              }
          }
      }
  
      @Override
      public boolean stop(long timeout) throws HyracksDataException {
          try {
              if (stream.stop()) {
                  return true;
              }
              stream.close();
          } catch (Exception e) {
              throw HyracksDataException.create(e);
          }
          return false;
      }
  
      private boolean handleException(Throwable th) {
          boolean handled = true;
          try {
              handled &= stream.handleException(th);
              if (handled) {
                  handled &= dataParser.reset(stream);
              }
          } catch (Exception e) {
              th.addSuppressed(e);
              return false;
          }
          return handled;
      }
  
      @Override
      public String getStats() {
          return "{\"incoming-records-number\": " + incomingRecordsCount + "}";
      }
  }
  