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CassandraLayerWriter.scala
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CassandraLayerWriter.scala
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/*
* Copyright 2016 Azavea
*
* Licensed 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 geotrellis.spark.store.cassandra
import geotrellis.layer._
import geotrellis.store._
import geotrellis.store.avro._
import geotrellis.store.avro.codecs._
import geotrellis.store.cassandra._
import geotrellis.store.index._
import geotrellis.spark.store._
import geotrellis.spark.merge._
import geotrellis.util._
import com.typesafe.scalalogging.LazyLogging
import org.apache.spark.rdd.RDD
import io.circe._
import cats.Semigroup
import scala.reflect._
class CassandraLayerWriter(
val attributeStore: AttributeStore,
instance: CassandraInstance,
keyspace: String,
table: String
) extends LayerWriter[LayerId] with LazyLogging {
// Layer updating
def overwrite[
K: AvroRecordCodec: Boundable: Encoder: Decoder: ClassTag,
V: AvroRecordCodec: ClassTag,
M: Encoder: Decoder: Component[*, Bounds[K]]: Semigroup
](
id: LayerId,
rdd: RDD[(K, V)] with Metadata[M]
): Unit = {
update(id, rdd, None)
}
def update[
K: AvroRecordCodec: Boundable: Encoder: Decoder: ClassTag,
V: AvroRecordCodec: ClassTag,
M: Encoder: Decoder: Component[*, Bounds[K]]: Semigroup
](
id: LayerId,
rdd: RDD[(K, V)] with Metadata[M],
mergeFunc: (V, V) => V
): Unit = {
update(id, rdd, Some(mergeFunc))
}
private def update[
K: AvroRecordCodec: Boundable: Encoder: Decoder: ClassTag,
V: AvroRecordCodec: ClassTag,
M: Encoder: Decoder: Component[*, Bounds[K]]: Semigroup
](
id: LayerId,
rdd: RDD[(K, V)] with Metadata[M],
mergeFunc: Option[(V, V) => V]
) = {
validateUpdate[CassandraLayerHeader, K, V, M](id, rdd.metadata) match {
case Some(LayerAttributes(header, metadata, keyIndex, writerSchema)) =>
val (keyspace, table) = header.keyspace -> header.tileTable
logger.info(s"Writing update for layer ${id} to table $table")
val encodeKey = (key: K) => keyIndex.toIndex(key)
attributeStore.writeLayerAttributes(id, header, metadata, keyIndex, writerSchema)
CassandraRDDWriter.update(rdd, instance, id, encodeKey, keyspace, table, Some(writerSchema), mergeFunc)
case None =>
logger.warn(s"Skipping update with empty bounds for $id.")
}
}
// Layer writing
protected def _write[
K: AvroRecordCodec: Encoder: ClassTag,
V: AvroRecordCodec: ClassTag,
M: Encoder: Component[*, Bounds[K]]
](id: LayerId, rdd: RDD[(K, V)] with Metadata[M], keyIndex: KeyIndex[K]): Unit = {
val codec = KeyValueRecordCodec[K, V]
val schema = codec.schema
val header =
CassandraLayerHeader(
keyClass = classTag[K].toString(),
valueClass = classTag[V].toString(),
keyspace = keyspace,
tileTable = table
)
val metadata = rdd.metadata
val encodeKey = (key: K) => keyIndex.toIndex(key)
try {
attributeStore.writeLayerAttributes(id, header, metadata, keyIndex, schema)
CassandraRDDWriter.write(rdd, instance, id, encodeKey, keyspace, table)
} catch {
case e: Exception => throw new LayerWriteError(id).initCause(e)
}
}
}
object CassandraLayerWriter {
def apply(
instance: CassandraInstance,
keyspace: String,
table: String
): CassandraLayerWriter =
new CassandraLayerWriter(
attributeStore = CassandraAttributeStore(instance),
instance = instance,
keyspace = keyspace,
table = table
)
def apply(
attributeStore: CassandraAttributeStore,
keyspace: String,
table: String
): CassandraLayerWriter =
new CassandraLayerWriter(
attributeStore = attributeStore,
instance = attributeStore.instance,
keyspace = keyspace,
table = table
)
}