/*
 * 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.hbase.spark.example.hbasecontext;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.spark.FamilyHFileWriteOptions;
import org.apache.hadoop.hbase.spark.JavaHBaseContext;
import org.apache.hadoop.hbase.spark.KeyFamilyQualifier;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.function.Function;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * Run this example using command below:
 *
 *  SPARK_HOME/bin/spark-submit --master local[2] --class org.apache.hadoop.hbase.spark.example.hbasecontext.JavaHBaseBulkLoadExample
 *  path/to/hbase-spark.jar {path/to/output/HFiles}
 *
 * This example will output put hfiles in {path/to/output/HFiles}, and user can run
 * 'hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles' to load the HFiles into table to verify this example.
 */
final public class JavaHBaseBulkLoadExample {
  private JavaHBaseBulkLoadExample() {}

  public static void main(String[] args) {
    if (args.length < 1) {
      System.out.println("JavaHBaseBulkLoadExample  " + "{outputPath}");
      return;
    }

    String tableName = "bulkload-table-test";
    String columnFamily1 = "f1";
    String columnFamily2 = "f2";

    SparkConf sparkConf = new SparkConf().setAppName("JavaHBaseBulkLoadExample " + tableName);
    JavaSparkContext jsc = new JavaSparkContext(sparkConf);

    try {
      List<String> list= new ArrayList<String>();
      // row1
      list.add("1," + columnFamily1 + ",b,1");
      // row3
      list.add("3," + columnFamily1 + ",a,2");
      list.add("3," + columnFamily1 + ",b,1");
      list.add("3," + columnFamily2 + ",a,1");
      /* row2 */
      list.add("2," + columnFamily2 + ",a,3");
      list.add("2," + columnFamily2 + ",b,3");

      JavaRDD<String> rdd = jsc.parallelize(list);

      Configuration conf = HBaseConfiguration.create();
      JavaHBaseContext hbaseContext = new JavaHBaseContext(jsc, conf);



      hbaseContext.bulkLoad(rdd, TableName.valueOf(tableName),new BulkLoadFunction(), args[0],
          new HashMap<byte[], FamilyHFileWriteOptions>(), false, HConstants.DEFAULT_MAX_FILE_SIZE);
    } finally {
      jsc.stop();
    }
  }

  public static class BulkLoadFunction implements Function<String, Pair<KeyFamilyQualifier, byte[]>> {

    @Override
    public Pair<KeyFamilyQualifier, byte[]> call(String v1) throws Exception {
      if (v1 == null)
        return null;
      String[] strs = v1.split(",");
      if(strs.length != 4)
        return null;
      KeyFamilyQualifier kfq = new KeyFamilyQualifier(Bytes.toBytes(strs[0]), Bytes.toBytes(strs[1]),
          Bytes.toBytes(strs[2]));
      return new Pair(kfq, Bytes.toBytes(strs[3]));
    }
  }
}