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.aerospike;
  
  import java.util.Collection;
  import java.util.List;
  
  import org.apache.apex.malhar.lib.db.AbstractBatchTransactionableStoreOutputOperator;
  
  import com.aerospike.client.AerospikeException;
  import com.aerospike.client.Bin;
  import com.aerospike.client.Key;
  import com.google.common.collect.Lists;
  
  /**
   * Generic base adaptor which creates a transaction at the start of window.
   * Subclasses should provide implementation for getting updated bins.
   * <p>
   * Executes all the put updates and closes the transaction at the end of the
   * window. The tuples in a window are stored in check-pointed collection which
   * is cleared in the endWindow(). This is needed for the recovery. The operator
   * writes a tuple at least once in the database, which is why only when all the
   * updates are executed, the transaction is committed in the end window call.
   * </p>
   *
   * @displayName Abstract Aerospike Transactional Put
   * @category Output
   * @tags put, transactional
   * @param <T>type of tuple
   * @since 1.0.4
   */
  public abstract class AbstractAerospikeTransactionalPutOperator<T>
      extends AbstractBatchTransactionableStoreOutputOperator<T, AerospikeTransactionalStore>
  {
    private final transient List<Bin> bins;
  
    public AbstractAerospikeTransactionalPutOperator()
    {
      super();
      bins = Lists.newArrayList();
    }
  
    /**
     * Any concrete class needs to implement this method which using the input tuple, adds the
     * modified bins to bins list and returns the key for that updated record.
     *
     * @param tuple Tuple coming in from input port
     * @param bins list of bins that would be updated for this tuple
     * @return key for the row to be updated in the database
     * @throws AerospikeException
     */
    protected abstract Key getUpdatedBins(T tuple, List<Bin> bins) throws AerospikeException;
  
    @Override
    public void processBatch(Collection<T> tuples)
    {
      Key key;
      Bin[] binsArray;
      try {
        for (T tuple: tuples) {
          key = getUpdatedBins(tuple,bins);
          binsArray = new Bin[bins.size()];
          binsArray = bins.toArray(binsArray);
          store.getClient().put(null, key, binsArray);
          bins.clear();
        }
      } catch (AerospikeException e) {
        throw new RuntimeException(e);
      }
    }
  }
  