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[streaming] [scala] Scala wrapper for DataStreamUtils
This closes apache#1574
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...aming-contrib/src/main/scala/org/apache/flink/contrib/streaming/scala/utils/package.scala
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/* | ||
* 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. | ||
*/ | ||
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package org.apache.flink.contrib.streaming.scala | ||
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import org.apache.flink.api.common.typeinfo.TypeInformation | ||
import org.apache.flink.contrib.streaming.{DataStreamUtils => JavaStreamUtils} | ||
import org.apache.flink.streaming.api.scala._ | ||
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import _root_.scala.reflect.ClassTag | ||
import scala.collection.JavaConverters._ | ||
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package object utils { | ||
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/** | ||
* This class provides simple utility methods for collecting a [[DataStream]], | ||
* effectively enriching it with the functionality encapsulated by [[JavaStreamUtils]]. | ||
* | ||
* @param self DataStream | ||
*/ | ||
implicit class DataStreamUtils[T: TypeInformation : ClassTag](val self: DataStream[T]) { | ||
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/** | ||
* Returns a scala iterator to iterate over the elements of the DataStream. | ||
* @return The iterator | ||
*/ | ||
def collect() : Iterator[T] = { | ||
JavaStreamUtils.collect(self.javaStream).asScala | ||
} | ||
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} | ||
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} |