[GitHub] [flink] JingsongLi commented on a change in pull request #11496: [FLINK-16743][table] Introduce datagen, print, blackhole connectors

[GitBox <gi...@apache.org>]

JingsongLi commented on a change in pull request #11496:
URL: https://github.com/apache/flink/pull/11496#discussion_r422808127



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File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/datagen/DataGeneratorSource.java
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@@ -0,0 +1,102 @@
+/*
+ * 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.source.datagen;
+
+import org.apache.flink.annotation.Experimental;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;
+
+/**
+ * A data generator source that abstract data generator. It can used to easy startup/test
+ * for streaming job and performance testing.
+ * It is stateful, re-scalable, possibly in parallel.
+ */
+@Experimental
+public class DataGeneratorSource<T> extends RichParallelSourceFunction<T> implements CheckpointedFunction {
+
+	private static final long serialVersionUID = 1L;
+
+	private final DataGenerator<T> generator;
+	private final long rowsPerSecond;
+
+	transient volatile boolean isRunning;
+
+	/**
+	 * Creates a source that emits records by {@link DataGenerator} without controlling emit rate.
+	 *
+	 * @param generator data generator.
+	 */
+	public DataGeneratorSource(DataGenerator<T> generator) {
+		this(generator, Long.MAX_VALUE);
+	}
+
+	/**
+	 * Creates a source that emits records by {@link DataGenerator}.
+	 *
+	 * @param generator data generator.
+	 * @param rowsPerSecond Control the emit rate.
+	 */
+	public DataGeneratorSource(DataGenerator<T> generator, long rowsPerSecond) {
+		this.generator = generator;
+		this.rowsPerSecond = rowsPerSecond;
+	}
+
+	@Override
+	public void initializeState(FunctionInitializationContext context) throws Exception {
+		this.generator.open("TOP_FIELD", context, getRuntimeContext());

Review comment:
       This is just name for generator, I will change to "DataGenerator".




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