streaming.core.compositor.spark.transformation.SQLCompositor.scala Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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 streaming.core.compositor.spark.transformation
import java.util
import org.apache.log4j.Logger
import org.apache.spark.sql.DataFrame
import serviceframework.dispatcher.{Compositor, Processor, Strategy}
import streaming.core.CompositorHelper
import scala.collection.JavaConversions._
/**
* Created by allwefantasy on 27/3/2017.
*/
class SQLCompositor[T] extends Compositor[T] with CompositorHelper {
private var _configParams: util.List[util.Map[Any, Any]] = _
val logger = Logger.getLogger(classOf[SQLCompositor[T]].getName)
override def initialize(typeFilters: util.List[String], configParams: util.List[util.Map[Any, Any]]): Unit = {
this._configParams = configParams
}
def sql = {
_configParams.get(0).get("sql") match {
case a: util.List[_] => Some(a.mkString(" "))
case a: String => Some(a)
case _ => None
}
}
def outputTableName = {
config[String]("outputTableName", _configParams)
}
override def result(alg: util.List[Processor[T]], ref: util.List[Strategy[T]], middleResult: util.List[T], params: util.Map[Any, Any]): util.List[T] = {
require(sql.isDefined, "please set sql by variable `sql` in config file")
val _sql = translateSQL(sql.get, params)
val _outputTableName = outputTableName
val df = sparkSession(params).sql(_sql)
config[String]("type", _configParams) match {
case Some(name) if name == "ddl" => df.show(1)
case _ =>
}
_outputTableName match {
case Some(name) if !name.isEmpty && name != "-" => df.createOrReplaceTempView(name)
case None =>
}
val cacheKey = "__caches__"
config[Boolean]("cache", _configParams) match {
case Some(cache) => if (cache) {
df.cache()
if (!params.containsKey(cacheKey)) {
params.put(cacheKey, new util.ArrayList[DataFrame]())
}
params.get(cacheKey).asInstanceOf[util.List[DataFrame]].add(df)
}
case _ =>
}
if (middleResult == null) List() else middleResult
}
}