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From StefanRRichter <...@git.apache.org>
Subject [GitHub] flink pull request #2729: [FLINK-4883]Prevent UDFs implementations through S...
Date Wed, 09 Nov 2016 14:32:38 GMT
Github user StefanRRichter commented on a diff in the pull request:

    --- Diff: flink-java/src/main/java/org/apache/flink/api/java/DataSet.java ---
    @@ -181,7 +181,17 @@ protected void fillInType(TypeInformation<T> typeInfo) {
     		return this.type;
    +	/**
    +     *  1. Check if the function is implemented by a scala object. Checks only if scala
object function forbidden
    +     *    is not disabled in the [[org.apache.flink.api.common.ExecutionConfig]]
    +     *
    +     *  2. Returns a "closure-cleaned" version of the given function. Cleans only if
closure cleaning
    +     *     is not disabled in the [[org.apache.flink.api.common.ExecutionConfig]]
    +     */
     	public <F> F clean(F f) {
    --- End diff --
    I suggest to move this check in a separate method like:
    ```public <F> F checkNotSingleton(F f)```
    One method should typically have one single duty, and the duty of a cleaning function
should not be checking for singleton objects. Both functions could then be chained however
into `clean(check(f))`.

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