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.hbase;
  
  import java.io.IOException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.hadoop.hbase.client.HTable;
  import org.apache.hadoop.hbase.client.Put;
  
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.netlet.util.DTThrowable;
  
  /**
   * A base implementation of an AggregateTransactionableStoreOutputOperator
   * operator for storing tuples in HBase rows and provides a batch put.Subclasses
   * should provide implementation for put operation. <br>
   * <p>
   * <br>
   * This class provides a HBase output operator that can be used to store tuples
   * in rows in a HBase table. It should be extended by the end-operator
   * developer. The extending class should implement operationPut method and
   * provide a HBase Put metric object that specifies where and what to store for
   * the tuple in the table.<br>
   *
   * <br>
   *
   * Note that since HBase doesn't support transactions this store cannot
   * guarantee each tuple is written only once to HBase in case the operator is
   * restarted from an earlier checkpoint. It only tries to minimize the number of
   * duplicates limiting it to the tuples that were processed in the window when
   * the operator shutdown. It supports atleast once and atmost once processing
   * modes. Exactly once is not supported
   *
   * @displayName Abstract HBase Window Put Output
   * @category Output
   * @tags hbase, put, transactionable, batch
   * @param <T> The tuple type
   * @since 1.0.2
   */
  public abstract class AbstractHBaseWindowPutOutputOperator<T> extends AbstractHBaseWindowOutputOperator<T>
  {
    private static final transient Logger logger = LoggerFactory.getLogger(AbstractHBaseWindowPutOutputOperator.class);
    private transient ProcessingMode mode;
  
    @Deprecated
    public ProcessingMode getMode()
    {
      return mode;
    }
  
    @Deprecated
    public void setMode(ProcessingMode mode)
    {
      this.mode = mode;
    }
  
    public AbstractHBaseWindowPutOutputOperator()
    {
      store = new HBaseWindowStore();
    }
  
    @Override
    public void processTuple(T tuple, HTable table)
    {
      try {
        Put put = operationPut(tuple);
        table.put(put);
      } catch (IOException e) {
        logger.error("Could not output tuple", e);
        DTThrowable.rethrow(e);
      }
    }
  
    public abstract Put operationPut(T t) throws IOException;
  
    @Override
    public void setup(OperatorContext context)
    {
      mode = context.getValue(context.PROCESSING_MODE);
      if (mode == ProcessingMode.EXACTLY_ONCE) {
        throw new RuntimeException("This operator only supports atmost once and atleast once processing modes");
      }
      super.setup(context);
    }
  
  }
  