/*
    * 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.omid;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.CellComparator;
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.KeyValue;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.client.Connection;
  import org.apache.hadoop.hbase.client.CoprocessorHConnection;
  import org.apache.hadoop.hbase.coprocessor.ObserverContext;
  import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
  import org.apache.hadoop.hbase.regionserver.HRegionServer;
  import org.apache.hadoop.hbase.regionserver.Region;
  import org.apache.hadoop.hbase.regionserver.Store;
  import org.apache.hadoop.hbase.util.Bytes;
  
  import java.io.IOException;
  
  public class HBaseShims {
  
      static public void setKeyValueSequenceId(KeyValue kv, int sequenceId) {
  
          kv.setSequenceId(sequenceId);
  
      }
  
      static public Region getRegionCoprocessorRegion(RegionCoprocessorEnvironment env) {
  
          return env.getRegion();
  
      }
  
      static public void flushAllOnlineRegions(HRegionServer regionServer, TableName tableName) throws IOException {
  
          for (Region r : regionServer.getOnlineRegions(tableName)) {
              r.flush(true);
          }
  
      }
  
      static public void addFamilyToHTableDescriptor(HTableDescriptor tableDesc, HColumnDescriptor columnDesc) {
  
          tableDesc.addFamily(columnDesc);
  
      }
  
      public static CellComparator cellComparatorInstance() {
          return new CellComparator();
      }
  
      public static boolean OmidCompactionEnabled(ObserverContext<RegionCoprocessorEnvironment> env,
                                    Store store,
                                    String cfFlagValue) {
          HTableDescriptor desc = env.getEnvironment().getRegion().getTableDesc();
          HColumnDescriptor famDesc
                  = desc.getFamily(Bytes.toBytes(store.getColumnFamilyName()));
          return Boolean.valueOf(famDesc.getValue(cfFlagValue));
      }
  
  
      public static void setCompaction(Connection conn, TableName table, byte[] columnFamily, String key, String value)
              throws IOException {
          try(Admin admin = conn.getAdmin()) {
              HTableDescriptor desc = admin.getTableDescriptor(table);
              HColumnDescriptor cfDesc = desc.getFamily(columnFamily);
              cfDesc.setValue(key, value);
              admin.modifyColumn(table, cfDesc);
          }
      }
      
      /**
       * For HBase 1.x, an HConstants.HBASE_CLIENT_RETRIES_NUMBER value of 0
       * means no retries, while for 2.x a value of 1 means no retries. 
       * @return
       */
      public static int getNoRetriesNumber() {
          return 0;
      }
      
      /**
      * Create an HBase Connection from the region server
      */
     public static Connection newServerConnection(Configuration config, RegionCoprocessorEnvironment env) throws IOException {
         return new CoprocessorHConnection(config, (HRegionServer)env.getRegionServerServices());
     }
 
 }