Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4671#discussion_r140458205
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/async/AbstractAsyncCallableWithResources.java
---
@@ -0,0 +1,194 @@
+/*
+ * 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.io.async;
+
+import org.apache.flink.util.ExceptionUtils;
+
+import java.io.IOException;
+
+/**
+ * The abstract class encapsulates the lifecycle and execution strategy
for asynchronous operations that use resources.
+ *
+ * @param <V> return type of the asynchronous call.
+ */
+public abstract class AbstractAsyncCallableWithResources<V> implements
StoppableCallbackCallable<V> {
+
+ /** Tracks if the stop method was called on this object. */
+ private volatile boolean stopped;
+
+ /** Tracks if call method was executed (only before stop calls). */
+ private volatile boolean called;
+
+ /** Stores a collected exception if there was on during stop. */
--- End diff --
nit: "if there was one ..."
---
