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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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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,
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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specific language governing permissions and limitations
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*/
package org.apache.griffin.measure.datasource.cache

import org.apache.spark.sql.SQLContext

import org.apache.griffin.measure.Loggable
import org.apache.griffin.measure.datasource.TimestampStorage
import org.apache.griffin.measure.utils.ParamUtil._

object StreamingCacheClientFactory extends Loggable {

  private object DataSourceCacheType {
    val ParquetRegex = "^(?i)parq(uet)?$".r
    val JsonRegex = "^(?i)json$".r
    val OrcRegex = "^(?i)orc$".r
  }
  import DataSourceCacheType._

  val _type = "type"

  /**
    * create streaming cache client
    * @param sqlContext     sqlContext in spark environment
    * @param checkpointOpt  data source checkpoint/cache config option
    * @param name           data source name
    * @param index          data source index
    * @param tmstCache      the same tmstCache instance inside a data source
    * @return               streaming cache client option
    */
  def getClientOpt(sqlContext: SQLContext, checkpointOpt: Option[Map[String, Any]],
                   name: String, index: Int, tmstCache: TimestampStorage
                  ): Option[StreamingCacheClient] = {
    checkpointOpt.flatMap { param =>
      try {
        val tp = param.getString(_type, "")
        val dsCache = tp match {
          case ParquetRegex() =>
            StreamingCacheParquetClient(sqlContext, param, name, index, tmstCache)
          case JsonRegex() =>
            StreamingCacheJsonClient(sqlContext, param, name, index, tmstCache)
          case OrcRegex() =>
            StreamingCacheOrcClient(sqlContext, param, name, index, tmstCache)
          case _ =>
            StreamingCacheParquetClient(sqlContext, param, name, index, tmstCache)
        }
        Some(dsCache)
      } catch {
        case e: Throwable =>
          error("generate data source cache fails")
          None
      }
    }
  }

}