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.apex.malhar.contrib.nifi;
  
  import java.util.List;
  
  import org.apache.apex.malhar.lib.wal.WindowDataManager;
  import org.apache.nifi.remote.client.SiteToSiteClient;
  
  import com.datatorrent.api.DefaultOutputPort;
  
  /**
   * This is the base implementation of a NiFi input operator with a single output port.&nbsp;
   * Subclasses should implement the methods which convert NiFi DataPackets to tuples.
   * <p>
   * <br>
   * Ports:<br>
   * <b>Input</b>: No input port<br>
   * <b>Output</b>: Have only one output port<br>
   * <br>
   * Properties:<br>
   * None<br>
   * <br>
   * Compile time checks:<br>
   * Class derived from this has to implement the abstract method createTuple(DataPacket dp) <br>
   * <br>
   * Run time checks:<br>
   * None<br>
   * <br>
   * Benchmarks:<br>
   * TBD<br>
   * <br>
   * </p>
   *
   * @displayName Abstract NiFi Single Port Input
   * @category Messaging
   * @tags input operator
   *
   *
   * @since 3.4.0
   */
  public abstract class AbstractNiFiSinglePortInputOperator<T> extends AbstractNiFiInputOperator<T>
  {
  
    /**
     * This is the output port on which tuples extracted from NiFi data packets are emitted.
     */
    public final transient DefaultOutputPort<T> outputPort = new DefaultOutputPort<>();
  
    /**
     *
     * @param siteToSiteBuilder the builder for a NiFi SiteToSiteClient
     * @param windowDataManager a WindowDataManager to save and load state for windows of tuples
     */
    public AbstractNiFiSinglePortInputOperator(final SiteToSiteClient.Builder siteToSiteBuilder,
        final WindowDataManager windowDataManager)
    {
      super(siteToSiteBuilder, windowDataManager);
    }
  
    @Override
    protected void emitTuples(final List<T> tuples)
    {
      for (T tuple : tuples) {
        outputPort.emit(tuple);
      }
    }
  
  }
  