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https://issues.apache.org/jira/browse/FLINK-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125437#comment-14125437
]
ASF GitHub Bot commented on FLINK-1062:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/incubator-flink/pull/113#discussion_r17233691
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/functions/util/FunctionUtils.java
---
@@ -84,4 +84,66 @@ public static boolean isLambdaFunction(Function
function) {
return false;
}
+
+ public static Method extractLambdaMethod(Function function) {
+ try {
+ // get serialized lambda
+ Object serializedLambda = null;
+ for (Class<?> clazz = function.getClass(); clazz !=
null; clazz = clazz.getSuperclass()) {
+ try {
+ Method replaceMethod =
clazz.getDeclaredMethod("writeReplace");
+ replaceMethod.setAccessible(true);
+ Object serialVersion =
replaceMethod.invoke(function);
+
+ // check if class is a lambda function
+ if
(serialVersion.getClass().getName().equals("java.lang.invoke.SerializedLambda"))
{
+
+ // check if SerializedLambda
class is present
+ try {
+
Class.forName("java.lang.invoke.SerializedLambda");
+ }
+ catch (Throwable t) {
--- End diff --
I think this should be a `ClassNotFoundException`
> Type Extraction for Lambdas
> ---------------------------
>
> Key: FLINK-1062
> URL: https://issues.apache.org/jira/browse/FLINK-1062
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Affects Versions: 0.7-incubating
> Reporter: Stephan Ewen
> Assignee: Timo Walther
> Fix For: 0.7-incubating
>
>
> Lambdas currently work only for {{filter}} and {{reduce(a,b)}}, because
> Lambda type extraction is not in place right now.
> We need to extend the type extraction for lambdas to support the other
> functions.
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