[GitHub] [flink] SteNicholas commented on a change in pull request #14207: [FLINK-20250][table-runtime] NPE when invoking AsyncLookupJoinRunner#close method

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

SteNicholas commented on a change in pull request #14207:
URL: https://github.com/apache/flink/pull/14207#discussion_r537327673



##########
File path: flink-table/flink-table-runtime-blink/src/test/java/org/apache/flink/table/runtime/operators/join/AsyncLookupJoinRunnerTest.java
##########
@@ -0,0 +1,156 @@
+/*
+ * 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.table.runtime.operators.join;
+
+import org.apache.flink.api.common.functions.AbstractRichFunction;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.async.AsyncFunction;
+import org.apache.flink.streaming.api.functions.async.ResultFuture;
+import org.apache.flink.streaming.util.MockStreamingRuntimeContext;
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.data.GenericRowData;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.runtime.collector.TableFunctionCollector;
+import org.apache.flink.table.runtime.collector.TableFunctionResultFuture;
+import org.apache.flink.table.runtime.generated.GeneratedFunctionWrapper;
+import org.apache.flink.table.runtime.generated.GeneratedResultFutureWrapper;
+import org.apache.flink.table.runtime.operators.join.lookup.AsyncLookupJoinRunner;
+import org.apache.flink.table.runtime.typeutils.InternalTypeInfo;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.function.Supplier;
+
+import static org.apache.flink.table.data.StringData.fromString;
+import static org.apache.flink.table.runtime.util.StreamRecordUtils.row;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
+
+/**
+ * Tests for {@link AsyncLookupJoinRunner}.
+ */
+public class AsyncLookupJoinRunnerTest {
+
+	@Test
+	public void testCloseAsyncLookupJoinRunner() throws Exception {
+		final InternalTypeInfo<RowData> rightRowTypeInfo = InternalTypeInfo.ofFields(
+				DataTypes.INT().getLogicalType(),
+				DataTypes.STRING().getLogicalType());
+		final AsyncLookupJoinRunner joinRunner = new AsyncLookupJoinRunner(
+				new GeneratedFunctionWrapper(new TestingFetcherFunction()),
+				new GeneratedResultFutureWrapper<>(new TestingFetcherResultFuture()),
+				rightRowTypeInfo,
+				rightRowTypeInfo,
+				true,
+				100);
+		assertNull(joinRunner.getAllResultFutures());
+		closeAsyncLookupJoinRunner(joinRunner);
+
+		joinRunner.setRuntimeContext(new MockStreamingRuntimeContext(false, 1, 0));
+		joinRunner.open(new Configuration());
+		assertNotNull(joinRunner.getAllResultFutures());
+		closeAsyncLookupJoinRunner(joinRunner);
+
+		joinRunner.open(new Configuration());
+		joinRunner.asyncInvoke(row(1, "a"), new TestingFetcherResultFuture());
+		assertNotNull(joinRunner.getAllResultFutures());
+		closeAsyncLookupJoinRunner(joinRunner);
+	}
+
+	private void closeAsyncLookupJoinRunner(AsyncLookupJoinRunner joinRunner) throws Exception {
+		try {
+			joinRunner.close();
+		} catch (NullPointerException e) {
+			fail("Expected close to fail with null pointer exception.");
+		}
+	}
+
+	// ---------------------------------------------------------------------------------
+
+	/**
+	 * The {@link TestingFetcherFunction} only accepts a single integer lookup key and
+	 * returns zero or one or more RowData.
+	 */
+	public static final class TestingFetcherFunction
+			extends AbstractRichFunction
+			implements AsyncFunction<RowData, RowData> {
+
+		private static final long serialVersionUID = 4018474964018227081L;

Review comment:
       > Could
   
   @leonardBang I thought that it could be defined once and reused `TestingFetcherFunction` and `TestingFetcherResultFuture`. I would like to reuse them.




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