Github user mbalassi commented on a diff in the pull request:
https://github.com/apache/flink/pull/659#discussion_r29854824
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/operators/TwoInputStreamOperator.java
---
@@ -0,0 +1,35 @@
+/*
+ * 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.operators;
+
+/**
+ * Interface for stream operators with two inputs. Use
+ * {@link org.apache.flink.streaming.api.operators.AbstractStreamOperator}
as a base class if
+ * you want to implement a custom operator.
+ *
+ * @param <IN1> The input type of the operator
+ * @param <IN2> The input type of the operator
+ * @param <OUT> The output type of the operator
+ */
+public interface TwoInputStreamOperator<IN1, IN2, OUT> extends
StreamOperator<OUT> {
+
+ public void receiveElement1(IN1 element) throws Exception;
+
+ public void receiveElement2(IN2 element) throws Exception;
+}
--- End diff --
How about `CoStreamOperator` as a name?
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