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Subject [GitHub] [flink] StefanRRichter commented on a change in pull request #8124: [FLINK-11877] Implement the runtime handling of the InputSelectable interface
Date Thu, 11 Apr 2019 16:30:48 GMT
StefanRRichter commented on a change in pull request #8124: [FLINK-11877] Implement the runtime
handling of the InputSelectable interface
URL: https://github.com/apache/flink/pull/8124#discussion_r274511867
 
 

 ##########
 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/Input.java
 ##########
 @@ -0,0 +1,69 @@
+/*
+ * 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.runtime.io;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.streaming.runtime.streamrecord.StreamElement;
+
+import java.io.IOException;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Basic interface for inputs of stream operators.
+ */
+@Internal
+public interface Input {
+
+	int getId();
+
+	/**
+	 * Poll the next {@link StreamElement}.
+	 *
+	 * @return null if there is no data to return or if {@link #isFinished()} returns true.
+	 *
+	 * @throws IOException  Thrown if the network or local disk I/O fails.
+	 * @throws InterruptedException Thrown if the thread is interrupted.
+	 */
+	StreamElement pollNextElement() throws IOException, InterruptedException;
+
+	/**
+	 * Tests if it reaches the end of the input.
+	 *
+	 * @return true if was reached, false otherwise.
+	 */
+	boolean isFinished();
+
+	/**
+	 * Register a listener that forward input notifications to.
+	 */
+	CompletableFuture<?> listen();
+
+	/**
+	 * Cancel the listener registered previously.
+	 *
+	 * <p>Note that it must be guaranteed to be thread-safe.
+	 */
+	void unlisten();
+
+	/**
+	 * Closes this input and releases any resources associated with the input.
+	 *
+	 * @throws Exception
 
 Review comment:
   Missing description.

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