[hotfix] Add TestingRpcServiceExtension for Junit5 tests

flink-runtime/src/test/java/org/apache/flink/runtime/rpc/TestingRpcServiceExtension.java

@@ -0,0 +1,65 @@
+/*
+ * 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.runtime.rpc;
+
+import org.apache.flink.core.testutils.CustomExtension;
+import org.apache.flink.util.Preconditions;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+import javax.annotation.Nullable;
+
+import java.util.concurrent.CompletableFuture;
+
+/** Custom extension that starts a {@link TestingRpcService}. */
+public class TestingRpcServiceExtension implements CustomExtension {
+
+    @Nullable private TestingRpcService testingRpcService;
+
+    public TestingRpcServiceExtension() {
+        this.testingRpcService = null;
+    }
+
+    public TestingRpcService getTestingRpcService() {
+        Preconditions.checkNotNull(testingRpcService);
+        return testingRpcService;
+    }
+
+    @Override
+    public void before(ExtensionContext extensionContext) {
+        if (testingRpcService != null) {
+            terminateRpcService(testingRpcService);
+        }
+
+        testingRpcService = new TestingRpcService();
+    }
+
+    @Override
+    public void after(ExtensionContext extensionContext) {
+        if (testingRpcService != null) {
+            terminateRpcService(testingRpcService);
+            testingRpcService = null;
+        }
+    }
+
+    private void terminateRpcService(TestingRpcService testingRpcService) {
+        CompletableFuture<Void> terminationFuture = testingRpcService.stopService();
+        terminationFuture.join();
+    }
+}