Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2629#discussion_r88679834
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/async/RichAsyncFunction.java
---
@@ -0,0 +1,39 @@
+/*
+ * 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.streaming.api.functions.async;
+
+import org.apache.flink.api.common.functions.AbstractRichFunction;
+import org.apache.flink.api.common.functions.RichFunction;
+import org.apache.flink.streaming.api.operators.async.AsyncCollector;
+
+/**
+ * Rich variant of the {@link AsyncFunction}. As a {@link RichFunction},
it gives access to the
+ * {@link org.apache.flink.api.common.functions.RuntimeContext} and
provides setup and teardown methods:
+ * {@link RichFunction#open(org.apache.flink.configuration.Configuration)}
and
+ * {@link RichFunction#close()}.
+ *
+ * @param <IN> The type of the input elements.
+ * @param <OUT> The type of the returned elements.
+ */
+public abstract class RichAsyncFunction<IN, OUT> extends
AbstractRichFunction
--- End diff --
I'm not sure whether we should offer a rich variant of `AsyncFunction`,
because any access to state from a future callback will not be scoped to the
correct key. I'm quite sure that people will run into this.
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