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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3708) Scala API for CEP
Date Wed, 20 Apr 2016 13:09:25 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249856#comment-15249856
] 

ASF GitHub Bot commented on FLINK-3708:
---------------------------------------

Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1905#discussion_r60403142
  
    --- Diff: flink-libraries/flink-cep-scala/src/test/scala/org/apache/flink/cep/scala/Event.scala
---
    @@ -0,0 +1,53 @@
    +/*
    + * 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.flink.cep.scala
    +
    +import org.apache.flink.api.common.ExecutionConfig
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.common.typeutils.TypeSerializer
    +import org.apache.flink.api.java.typeutils.TypeExtractor
    +
    +object Event {
    +  def createTypeSerializer: TypeSerializer[Event] = {
    +    val typeInformation: TypeInformation[Event] = TypeExtractor.createTypeInfo(classOf[Event])
    +    return typeInformation.createSerializer(new ExecutionConfig)
    +  }
    +}
    +
    +class Event(var id: Int, var name: String, var price: Double) {
    --- End diff --
    
    Why not simply reusing the Java `Event` class from the flink-cep test jar?


> Scala API for CEP
> -----------------
>
>                 Key: FLINK-3708
>                 URL: https://issues.apache.org/jira/browse/FLINK-3708
>             Project: Flink
>          Issue Type: Improvement
>          Components: CEP
>    Affects Versions: 1.1.0
>            Reporter: Till Rohrmann
>            Assignee: Stefan Richter
>
> Currently, The CEP library does not support Scala case classes, because the {{TypeExtractor}}
cannot handle them. In order to support them, it would be necessary to offer a Scala API for
the CEP library.



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