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.couchbase;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.apex.malhar.lib.db.AbstractStoreInputOperator;
  import org.apache.apex.malhar.lib.util.KryoCloneUtils;
  
  import com.couchbase.client.CouchbaseClient;
  import com.couchbase.client.vbucket.config.Config;
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.collect.Lists;
  
  import com.datatorrent.api.Context;
  import com.datatorrent.api.DefaultPartition;
  import com.datatorrent.api.Partitioner;
  import com.datatorrent.netlet.util.DTThrowable;
  
  /**
   * AbstractCouchBaseInputOperator which extends AbstractStoreInputOperator.
   * Classes extending from this operator should implement the abstract functionality of getTuple and getKeys.
   *
   * @since 2.0.0
   */
  public abstract class AbstractCouchBaseInputOperator<T> extends AbstractStoreInputOperator<T, CouchBaseStore> implements Partitioner<AbstractCouchBaseInputOperator<T>>
  {
    private static final Logger logger = LoggerFactory.getLogger(AbstractCouchBaseInputOperator.class);
    protected transient CouchbaseClient clientPartition = null;
  
    private int serverIndex;
  
    protected transient Config conf;
  
    // URL specific to a server.
    protected String serverURIString;
  
    public String getServerURIString()
    {
      return serverURIString;
    }
  
    @VisibleForTesting
    public void setServerURIString(String serverURIString)
    {
      this.serverURIString = serverURIString;
    }
  
    public int getServerIndex()
    {
      return serverIndex;
    }
  
    public void setServerIndex(int serverIndex)
    {
      this.serverIndex = serverIndex;
    }
  
    public AbstractCouchBaseInputOperator()
    {
      store = new CouchBaseStore();
    }
  
    @Override
    public void setup(Context.OperatorContext context)
    {
      if (clientPartition == null) {
        if (conf == null) {
          conf = store.getConf();
        }
        try {
          clientPartition = store.connectServer(serverURIString);
        } catch (IOException ex) {
          DTThrowable.rethrow(ex);
        }
      }
    }
  
    @Override
    public void teardown()
    {
      if (clientPartition != null) {
        clientPartition.shutdown(store.shutdownTimeout, TimeUnit.SECONDS);
      }
      super.teardown();
    }
  
    @Override
    public void emitTuples()
    {
      List<String> keys = getKeys();
      Object result = null;
      for (String key: keys) {
        int master = conf.getMaster(conf.getVbucketByKey(key));
        if (master == getServerIndex()) {
          result = clientPartition.get(key);
        }
      }
  
      if (result != null) {
        T tuple = getTuple(result);
        outputPort.emit(tuple);
      }
    }
  
    public abstract T getTuple(Object object);
  
    public abstract List<String> getKeys();
  
    @Override
    public void partitioned(Map<Integer, Partition<AbstractCouchBaseInputOperator<T>>> partitions)
    {
  
    }
  
    @Override
    public Collection<Partition<AbstractCouchBaseInputOperator<T>>> definePartitions(Collection<Partition<AbstractCouchBaseInputOperator<T>>> partitions, PartitioningContext incrementalCapacity)
    {
      conf = store.getConf();
      int numPartitions = conf.getServers().size();
      List<String> list = conf.getServers();
      Collection<Partition<AbstractCouchBaseInputOperator<T>>> newPartitions = Lists.newArrayListWithExpectedSize(numPartitions);
      KryoCloneUtils<AbstractCouchBaseInputOperator<T>> cloneUtils = KryoCloneUtils.createCloneUtils(this);
      for (int i = 0; i < numPartitions; i++) {
        AbstractCouchBaseInputOperator<T> oper = cloneUtils.getClone();
        oper.setServerIndex(i);
        oper.setServerURIString(list.get(i));
        logger.debug("oper {} urlstring is {}", i, oper.getServerURIString());
        newPartitions.add(new DefaultPartition<>(oper));
      }
  
      return newPartitions;
  
    }
  
  }
  