/*
 * 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 com.huawei.bigdata.spark.examples.hbasecontext;

import com.huawei.hadoop.security.LoginUtil;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.spark.JavaHBaseContext;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * This is a simple example of deleting records in HBase
 * with the bulkDelete function.
 */
public final class JavaHBaseBulkDeleteExample {
    private JavaHBaseBulkDeleteExample() {}

    public static void main(String[] args) throws IOException {
        if (args.length < 1) {
            System.out.println("JavaHBaseBulkDeleteExample  {tableName}");
            return;
        }
        LoginUtil.loginWithUserKeytab();
        String tableName = args[0];

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

        try {
            List<byte[]> list = new ArrayList<byte[]>(5);
            list.add(Bytes.toBytes("1"));
            list.add(Bytes.toBytes("2"));
            list.add(Bytes.toBytes("3"));
            list.add(Bytes.toBytes("4"));
            list.add(Bytes.toBytes("5"));

            JavaRDD<byte[]> rdd = jsc.parallelize(list);

            Configuration conf = HBaseConfiguration.create();

            JavaHBaseContext hbaseContext = new JavaHBaseContext(jsc, conf);

            hbaseContext.bulkDelete(rdd, TableName.valueOf(tableName), new DeleteFunction(), 4);
            System.out.println("Bulk Delete successfully!");
        } finally {
            jsc.stop();
        }
    }

    public static class DeleteFunction implements Function<byte[], Delete> {
        private static final long serialVersionUID = 1L;

        public Delete call(byte[] v) throws Exception {
            return new Delete(v);
        }
    }
}
