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package parallelai.spyglass.jdbc
import com.twitter.scalding.AccessMode
import com.twitter.scalding.Hdfs
import com.twitter.scalding.Mode
import com.twitter.scalding.Read
import com.twitter.scalding.Source
import com.twitter.scalding.Write
import cascading.scheme.{NullScheme, Scheme}
import cascading.tap.Tap
import cascading.tuple.Fields
import org.apache.hadoop.mapred.RecordReader
import org.apache.hadoop.mapred.OutputCollector
import org.apache.hadoop.mapred.JobConf
import com.twitter.scalding.Test
import com.twitter.scalding.MemoryTap
import java.io.InputStream
import java.io.OutputStream
import java.util.Properties
case class JDBCSource(
tableName: String = "tableName",
driverName: String = "com.mysql.jdbc.Driver",
connectionString: String = "jdbc:mysql://<hostname>:<port>/<db_name>",
userId: String = "user",
password: String = "password",
columnNames: List[String] = List("col1", "col2", "col3"),
columnDefs: List[String] = List("data_type", "data_type", "data_type"),
primaryKeys: List[String] = List("primary_key"),
fields: Fields = new Fields("fld1", "fld2", "fld3"),
orderBy: List[String] = List(),
updateBy: List[String] = List(),
updateByFields: Fields = null
) extends Source {
val hdfsScheme = new JDBCScheme(fields, columnNames.toArray, orderBy.toArray, updateByFields, updateBy.toArray)
.asInstanceOf[Scheme[JobConf, RecordReader[_, _], OutputCollector[_, _], _, _]]
// To enable local mode testing
//def localScheme = new NullScheme(fields, fields)
type LocalScheme = Scheme[Properties, InputStream, OutputStream, _, _]
def localScheme = new NullScheme[Properties, InputStream, OutputStream, Any, Any] (fields, fields)
override def createTap(readOrWrite: AccessMode)(implicit mode: Mode): Tap[_, _, _] = {
val jdbcScheme = hdfsScheme match {
case jdbc: JDBCScheme => jdbc
case _ => throw new ClassCastException("Failed casting from Scheme to JDBCScheme")
}
mode match {
case Hdfs(_, _) => readOrWrite match {
case Read => {
val tableDesc = new TableDesc(tableName, columnNames.toArray, columnDefs.toArray, primaryKeys.toArray)
val jdbcTap = new JDBCTap(connectionString, userId, password, driverName, tableDesc, jdbcScheme)
jdbcTap.asInstanceOf[Tap[_,_,_]]
}
case Write => {
val tableDesc = new TableDesc(tableName, columnNames.toArray, columnDefs.toArray, primaryKeys.toArray)
val jdbcTap = new JDBCTap(connectionString, userId, password, driverName, tableDesc, jdbcScheme)
jdbcTap.asInstanceOf[Tap[_,_,_]]
}
}
case Test(buffer) => readOrWrite match {
case Read => {
val hbt = new MemoryTap[InputStream, OutputStream](localScheme, buffer.apply(this).get)
hbt.asInstanceOf[Tap[_,_,_]]
}
case Write => {
val hbt = new MemoryTap[InputStream, OutputStream](localScheme, buffer.apply(this).get)
hbt.asInstanceOf[Tap[_,_,_]]
}
}
case _ => createEmptyTap(readOrWrite)(mode)
}
}
def createEmptyTap(readOrWrite : AccessMode)(mode : Mode) : Tap[_,_,_] = {
throw new RuntimeException("Source: (" + toString + ") doesn't support mode: " + mode.toString)
}
}
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