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package parallelai.spyglass.hbase
import java.io.IOException
import org.apache.hadoop.hbase.io.ImmutableBytesWritable
import org.apache.hadoop.hbase.util.Bytes
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 parallelai.spyglass.hbase.HBaseConstants.SourceMode
import cascading.scheme.{NullScheme, Scheme}
import cascading.tap.SinkMode
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
object Conversions {
implicit def bytesToString(bytes: Array[Byte]): String = Bytes.toString(bytes)
implicit def bytesToLong(bytes: Array[Byte]): Long = augmentString(bytesToString(bytes)).toLong
implicit def ibwToString(ibw: ImmutableBytesWritable): String = bytesToString(ibw.get())
implicit def stringToibw(s: String):ImmutableBytesWritable = new ImmutableBytesWritable(Bytes.toBytes(s))
}
case class HBaseSource(
tableName: String = null,
quorumNames: String = "localhost",
keyFields: Fields = null,
familyNames: List[String] = null,
valueFields: List[Fields] = null,
timestamp: Long = 0L,
sourceMode: SourceMode = SourceMode.SCAN_ALL,
startKey: String = null,
stopKey: String = null,
keyList: List[String] = null,
versions: Int = 1,
useSalt: Boolean = false,
prefixList: String = null,
sinkMode: SinkMode = SinkMode.UPDATE
) extends Source {
override val hdfsScheme = new HBaseScheme(keyFields, timestamp, familyNames.toArray, valueFields.toArray)
.asInstanceOf[Scheme[JobConf, RecordReader[_, _], OutputCollector[_, _], _, _]]
// To enable local mode testing
val allFields = keyFields.append(valueFields.toArray)
override def localScheme = new NullScheme(allFields, allFields)
override def createTap(readOrWrite: AccessMode)(implicit mode: Mode): Tap[_, _, _] = {
val hBaseScheme = hdfsScheme match {
case hbase: HBaseScheme => hbase
case _ => throw new ClassCastException("Failed casting from Scheme to HBaseScheme")
}
mode match {
case hdfsMode @ Hdfs(_, _) => readOrWrite match {
case Read => {
val hbt = new HBaseTap(quorumNames, tableName, hBaseScheme, SinkMode.KEEP)
sourceMode match {
case SourceMode.SCAN_RANGE => {
hbt.setHBaseRangeParms(startKey, stopKey, useSalt, prefixList)
}
case SourceMode.SCAN_ALL => {
hbt.setHBaseScanAllParms(useSalt, prefixList)
}
case SourceMode.GET_LIST => {
if( keyList == null )
throw new IOException("Key list cannot be null when Source Mode is " + sourceMode)
hbt.setHBaseListParms(keyList.toArray[String], versions, useSalt, prefixList)
}
case _ => throw new IOException("Unknown Source Mode (%)".format(sourceMode))
}
hbt.asInstanceOf[Tap[_,_,_]]
}
case Write => {
val hbt = new HBaseTap(quorumNames, tableName, hBaseScheme, sinkMode)
hbt.setUseSaltInSink(useSalt)
hbt.asInstanceOf[Tap[_,_,_]]
}
}
case _ => super.createTap(readOrWrite)(mode)
}
}
}
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