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.input.stream.factory;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.asterix.common.dataflow.ICcApplicationContext;
  import org.apache.asterix.common.exceptions.AsterixException;
  import org.apache.asterix.common.external.IExternalFilterEvaluatorFactory;
  import org.apache.asterix.external.api.AsterixInputStream;
  import org.apache.asterix.external.api.IExternalDataRuntimeContext;
  import org.apache.asterix.external.api.IExternalDataSourceFactory;
  import org.apache.asterix.external.api.IInputStreamFactory;
  import org.apache.asterix.external.input.stream.SocketClientInputStream;
  import org.apache.asterix.external.util.ExternalDataConstants;
  import org.apache.http.impl.conn.SystemDefaultDnsResolver;
  import org.apache.hyracks.algebricks.common.constraints.AlgebricksAbsolutePartitionConstraint;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.api.application.IServiceContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  
  public class SocketClientInputStreamFactory implements IInputStreamFactory {
  
      private static final long serialVersionUID = 1L;
      private transient IServiceContext serviceCtx;
      private transient AlgebricksAbsolutePartitionConstraint clusterLocations;
      private List<Pair<String, Integer>> sockets;
  
      @Override
      public AlgebricksAbsolutePartitionConstraint getPartitionConstraint() throws AlgebricksException {
          clusterLocations = IExternalDataSourceFactory.getPartitionConstraints(
                  (ICcApplicationContext) serviceCtx.getApplicationContext(), clusterLocations, sockets.size());
          return clusterLocations;
      }
  
      @Override
      public void configure(IServiceContext serviceCtx, Map<String, String> configuration,
              IWarningCollector warningCollector, IExternalFilterEvaluatorFactory filterEvaluatorFactory)
              throws AsterixException {
          try {
              this.serviceCtx = serviceCtx;
              this.sockets = new ArrayList<>();
              String socketsValue = configuration.get(ExternalDataConstants.KEY_SOCKETS);
              if (socketsValue == null) {
                  throw new IllegalArgumentException(
                          "\'sockets\' parameter not specified as part of adapter configuration");
              }
              String[] socketsArray = socketsValue.split(",");
              for (String socket : socketsArray) {
                  String[] socketTokens = socket.split(":");
                  String host = socketTokens[0].trim();
                  int port = Integer.parseInt(socketTokens[1].trim());
                  InetAddress[] resolved;
                  resolved = SystemDefaultDnsResolver.INSTANCE.resolve(host);
                  Pair<String, Integer> p = new Pair<>(resolved[0].getHostAddress(), port);
                  sockets.add(p);
              }
          } catch (UnknownHostException e) {
              throw new AsterixException(e);
          }
      }
  
      @Override
      public AsterixInputStream createInputStream(IExternalDataRuntimeContext context) throws HyracksDataException {
          try {
              return new SocketClientInputStream(sockets.get(context.getPartition()));
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  }
  