diff options
| -rw-r--r-- | LICENSE | 3 | ||||
| -rw-r--r-- | core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala | 62 | ||||
| -rw-r--r-- | core/src/test/java/org/apache/spark/JavaAPISuite.java | 13 |
3 files changed, 75 insertions, 3 deletions
@@ -646,7 +646,8 @@ THE SOFTWARE. ======================================================================== For Scala Interpreter classes (all .scala files in repl/src/main/scala -except for Main.Scala, SparkHelper.scala and ExecutorClassLoader.scala): +except for Main.Scala, SparkHelper.scala and ExecutorClassLoader.scala), +and for SerializableMapWrapper in JavaUtils.scala: ======================================================================== Copyright (c) 2002-2013 EPFL diff --git a/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala b/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala index b52d0a5028..86e9493130 100644 --- a/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala +++ b/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala @@ -19,7 +19,8 @@ package org.apache.spark.api.java import com.google.common.base.Optional -import scala.collection.convert.Wrappers.MapWrapper +import java.{util => ju} +import scala.collection.mutable private[spark] object JavaUtils { def optionToOptional[T](option: Option[T]): Optional[T] = @@ -32,7 +33,64 @@ private[spark] object JavaUtils { def mapAsSerializableJavaMap[A, B](underlying: collection.Map[A, B]) = new SerializableMapWrapper(underlying) + // Implementation is copied from scala.collection.convert.Wrappers.MapWrapper, + // but implements java.io.Serializable. It can't just be subclassed to make it + // Serializable since the MapWrapper class has no no-arg constructor. This class + // doesn't need a no-arg constructor though. class SerializableMapWrapper[A, B](underlying: collection.Map[A, B]) - extends MapWrapper(underlying) with java.io.Serializable + extends ju.AbstractMap[A, B] with java.io.Serializable { self => + override def size = underlying.size + + override def get(key: AnyRef): B = try { + underlying get key.asInstanceOf[A] match { + case None => null.asInstanceOf[B] + case Some(v) => v + } + } catch { + case ex: ClassCastException => null.asInstanceOf[B] + } + + override def entrySet: ju.Set[ju.Map.Entry[A, B]] = new ju.AbstractSet[ju.Map.Entry[A, B]] { + def size = self.size + + def iterator = new ju.Iterator[ju.Map.Entry[A, B]] { + val ui = underlying.iterator + var prev : Option[A] = None + + def hasNext = ui.hasNext + + def next() = { + val (k, v) = ui.next + prev = Some(k) + new ju.Map.Entry[A, B] { + import scala.util.hashing.byteswap32 + def getKey = k + def getValue = v + def setValue(v1 : B) = self.put(k, v1) + override def hashCode = byteswap32(k.hashCode) + (byteswap32(v.hashCode) << 16) + override def equals(other: Any) = other match { + case e: ju.Map.Entry[_, _] => k == e.getKey && v == e.getValue + case _ => false + } + } + } + + def remove() { + prev match { + case Some(k) => + underlying match { + case mm: mutable.Map[a, _] => + mm remove k + prev = None + case _ => + throw new UnsupportedOperationException("remove") + } + case _ => + throw new IllegalStateException("next must be called at least once before remove") + } + } + } + } + } } diff --git a/core/src/test/java/org/apache/spark/JavaAPISuite.java b/core/src/test/java/org/apache/spark/JavaAPISuite.java index 3ad4f2f193..e5bdad6bda 100644 --- a/core/src/test/java/org/apache/spark/JavaAPISuite.java +++ b/core/src/test/java/org/apache/spark/JavaAPISuite.java @@ -1357,6 +1357,19 @@ public class JavaAPISuite implements Serializable { pairRDD.collectAsMap(); // Used to crash with ClassCastException } + @SuppressWarnings("unchecked") + @Test + public void collectAsMapAndSerialize() throws Exception { + JavaPairRDD<String,Integer> rdd = + sc.parallelizePairs(Arrays.asList(new Tuple2<String,Integer>("foo", 1))); + Map<String,Integer> map = rdd.collectAsMap(); + ByteArrayOutputStream bytes = new ByteArrayOutputStream(); + new ObjectOutputStream(bytes).writeObject(map); + Map<String,Integer> deserializedMap = (Map<String,Integer>) + new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray())).readObject(); + Assert.assertEquals(1, deserializedMap.get("foo").intValue()); + } + @Test @SuppressWarnings("unchecked") public void sampleByKey() { |