spark ConstantInputDStream 源码
spark ConstantInputDStream 代码
文件路径：/streaming/src/main/scala/org/apache/spark/streaming/dstream/ConstantInputDStream.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 org.apache.spark.streaming.dstream
import scala.reflect.ClassTag
import org.apache.spark.rdd.RDD
import org.apache.spark.streaming.{StreamingContext, Time}
/**
* An input stream that always returns the same RDD on each time step. Useful for testing.
*/
class ConstantInputDStream[T: ClassTag](_ssc: StreamingContext, rdd: RDD[T])
extends InputDStream[T](_ssc) {
require(rdd != null,
"parameter rdd null is illegal, which will lead to NPE in the following transformation")
override def start(): Unit = {}
override def stop(): Unit = {}
override def compute(validTime: Time): Option[RDD[T]] = {
Some(rdd)
}
}
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