SPARK-3470 [CORE] [STREAMING] Add Closeable / close() to Java context objects
... that expose a stop() lifecycle method. This doesn't add `AutoCloseable`, which is Java 7+ only. But it should be possible to use try-with-resources on a `Closeable` in Java 7, as long as the `close()` does not throw a checked exception, and these don't. Q.E.D. Author: Sean Owen <sowen@cloudera.com> Closes #2346 from srowen/SPARK-3470 and squashes the following commits: 612c21d [Sean Owen] Add Closeable / close() to Java context objects that expose a stop() lifecycle method
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@ -17,6 +17,7 @@
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package org.apache.spark.api.java
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import java.io.Closeable
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import java.util
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import java.util.{Map => JMap}
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@ -40,7 +41,9 @@ import org.apache.spark.rdd.{EmptyRDD, HadoopRDD, NewHadoopRDD, RDD}
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* A Java-friendly version of [[org.apache.spark.SparkContext]] that returns
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* [[org.apache.spark.api.java.JavaRDD]]s and works with Java collections instead of Scala ones.
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*/
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class JavaSparkContext(val sc: SparkContext) extends JavaSparkContextVarargsWorkaround {
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class JavaSparkContext(val sc: SparkContext)
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extends JavaSparkContextVarargsWorkaround with Closeable {
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/**
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* Create a JavaSparkContext that loads settings from system properties (for instance, when
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* launching with ./bin/spark-submit).
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@ -534,6 +537,8 @@ class JavaSparkContext(val sc: SparkContext) extends JavaSparkContextVarargsWork
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sc.stop()
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}
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override def close(): Unit = stop()
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/**
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* Get Spark's home location from either a value set through the constructor,
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* or the spark.home Java property, or the SPARK_HOME environment variable
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@ -21,7 +21,7 @@ package org.apache.spark.streaming.api.java
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import scala.collection.JavaConversions._
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import scala.reflect.ClassTag
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import java.io.InputStream
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import java.io.{Closeable, InputStream}
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import java.util.{List => JList, Map => JMap}
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import akka.actor.{Props, SupervisorStrategy}
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@ -49,7 +49,7 @@ import org.apache.spark.streaming.receiver.Receiver
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* respectively. `context.awaitTransformation()` allows the current thread to wait for the
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* termination of a context by `stop()` or by an exception.
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*/
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class JavaStreamingContext(val ssc: StreamingContext) {
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class JavaStreamingContext(val ssc: StreamingContext) extends Closeable {
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/**
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* Create a StreamingContext.
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@ -540,6 +540,9 @@ class JavaStreamingContext(val ssc: StreamingContext) {
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def stop(stopSparkContext: Boolean, stopGracefully: Boolean) = {
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ssc.stop(stopSparkContext, stopGracefully)
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}
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override def close(): Unit = stop()
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}
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/**
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