/*
    * 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.hadoop.chukwa.datacollection.writer.solr;
  
  import java.util.List;
  
  import org.apache.hadoop.chukwa.Chunk;
  import org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent;
  import org.apache.hadoop.chukwa.datacollection.writer.ChukwaWriter;
  import org.apache.hadoop.chukwa.datacollection.writer.PipelineableWriter;
  import org.apache.hadoop.chukwa.datacollection.writer.WriterException;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.log4j.Logger;
  import org.apache.solr.client.solrj.impl.CloudSolrServer;
  import org.apache.solr.common.SolrInputDocument;
  
  public class SolrWriter extends PipelineableWriter {
    private static Logger log = Logger.getLogger(SolrWriter.class);
    private static CloudSolrServer server;
    private static String ID = "id";
    private static String SEQ_ID = "seqId";
    private static String DATA_TYPE = "type";
    private static String STREAM_NAME = "stream";
    private static String TAGS = "tags";
    private static String SOURCE = "source";
    private static String DATA = "data";
  
    public SolrWriter() throws WriterException {
      init(ChukwaAgent.getStaticConfiguration());
    }
    
    @Override
    public void init(Configuration c) throws WriterException {
      String serverName = c.get("solr.cloud.address");
      if (serverName == null) {
        throw new WriterException("Solr server address is not defined.");
      }
      String collection = c.get("solr.collection", "logs");
      server = new CloudSolrServer(serverName);
      server.setDefaultCollection(collection);
    }
  
    @Override
    public void close() throws WriterException {
    }
  
    @Override
    public CommitStatus add(List<Chunk> chunks) throws WriterException {
      CommitStatus rv = ChukwaWriter.COMMIT_OK;
      for(Chunk chunk : chunks) {
        try {
          SolrInputDocument doc = new SolrInputDocument();
          doc.addField(ID, chunk.getSource() + "_" + chunk.getSeqID());
          doc.addField(TAGS, chunk.getTags());
          doc.addField(STREAM_NAME, chunk.getStreamName());
          doc.addField(SOURCE, chunk.getSource());
          doc.addField(SEQ_ID, chunk.getSeqID());
          doc.addField(DATA_TYPE, chunk.getDataType());
          doc.addField(DATA, new String(chunk.getData()));
          server.add(doc);
          server.commit();
        } catch (Exception e) {
          log.error(ExceptionUtil.getStackTrace(e));
          throw new WriterException("Failed to store data to Solr Cloud.");
        }
      }
      if (next != null) {
        rv = next.add(chunks); //pass data through
      }
      return rv;
    }
  }