@@ -0,0 +1,1388 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one or more%0A * contributor license agreements.  See the NOTICE file distributed with%0A * this work for additional information regarding copyright ownership.%0A * The ASF licenses this file to You under the Apache License, Version 2.0%0A * (the %22License%22); you may not use this file except in compliance with%0A * the License.  You may obtain a copy of the License at%0A *%0A *    http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.apache.flink.streaming.runtime.io;%0A%0Aimport org.apache.flink.annotation.Internal;%0Aimport org.apache.flink.runtime.io.NullableAsyncDataInput;%0Aimport org.apache.flink.streaming.runtime.streamrecord.StreamElement;%0A%0Aimport java.io.Closeable;%0A%0A/**%0A * Basic interface for inputs of stream operators.%0A */%0A@Internal%0Apublic interface StreamTaskInput extends NullableAsyncDataInput%3CStreamElement%3E, Closeable %7B%0A%09int UNSPECIFIED = -1;%0A%0A%09/**%0A%09 * @return channel index of last returned %7B@link StreamElement%7D, or %7B@link #UNSPECIFIED%7D if%0A%09 * it is unspecified.%0A%09 */%0A%09int getLastChannel();%0A%7D%0A

Introduce Input interface