(flink) 03/07: [FLINK-20217][task] Introduce YieldingOperator to get access to MailboxExecutor for V1 operators

[pnowojski]

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commit a64c00b9d6e3c39ddbf064f69a01a50231ad82b5
Author: Piotr Nowojski <piotr.nowoj...@gmail.com>
AuthorDate: Tue Mar 19 13:59:16 2024 +0100

    [FLINK-20217][task] Introduce YieldingOperator to get access to 
MailboxExecutor for V1 operators
---
 .../api/operators/StreamOperatorFactoryUtil.java   |  3 ++
 .../streaming/api/operators/YieldingOperator.java  | 32 ++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git 
a/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamOperatorFactoryUtil.java
 
b/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamOperatorFactoryUtil.java
index 0bf3883417e..6f6ff1c2de2 100644
--- 
a/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamOperatorFactoryUtil.java
+++ 
b/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamOperatorFactoryUtil.java
@@ -87,6 +87,9 @@ public class StreamOperatorFactoryUtil {
                                         ? () -> processingTimeService
                                         : processingTimeServiceFactory,
                                 operatorEventDispatcher));
+        if (op instanceof YieldingOperator) {
+            ((YieldingOperator<?>) 
operatorFactory).setMailboxExecutor(mailboxExecutor);
+        }
         return new Tuple2<>(op, Optional.ofNullable(processingTimeService));
     }
 }
diff --git 
a/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/YieldingOperator.java
 
b/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/YieldingOperator.java
new file mode 100644
index 00000000000..f01ae2b5676
--- /dev/null
+++ 
b/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/YieldingOperator.java
@@ -0,0 +1,32 @@
+/*
+ * 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.operators;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.operators.MailboxExecutor;
+
+/**
+ * A V1 operator that needs access to the {@link MailboxExecutor} should 
implement this interface.
+ * Note, this interface is not needed when using {@link StreamOperatorFactory} 
or {@link
+ * AbstractStreamOperatorV2} as those have access to the {@link 
MailboxExecutor} via {@link
+ * StreamOperatorParameters#getMailboxExecutor()}
+ */
+@Internal
+public interface YieldingOperator<OUT> extends StreamOperator<OUT> {
+    void setMailboxExecutor(MailboxExecutor mailboxExecutor);
+}