aljoscha commented on a change in pull request #13596:
URL: https://github.com/apache/flink/pull/13596#discussion_r503729515



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/sorted/state/BatchExecutionInternalTimeService.java
##########
@@ -0,0 +1,133 @@
+/*
+ * 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.sorted.state;
+
+import org.apache.flink.runtime.state.KeyGroupedInternalPriorityQueue;
+import org.apache.flink.runtime.state.PriorityComparator;
+import org.apache.flink.streaming.api.operators.InternalTimer;
+import org.apache.flink.streaming.api.operators.InternalTimerService;
+import org.apache.flink.streaming.api.operators.TimerHeapInternalTimer;
+import org.apache.flink.streaming.api.operators.Triggerable;
+import org.apache.flink.streaming.runtime.tasks.ProcessingTimeService;
+import org.apache.flink.util.function.BiConsumerWithException;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * An implementation of a {@link InternalTimerService} that manages timers 
with a single active key at a time.
+ * Can be used in a BATCH execution mode.
+ */
+public class BatchExecutionInternalTimeService<K, N> implements 
InternalTimerService<N> {
+
+       private final ProcessingTimeService processingTimeService;
+
+       /**
+        * Processing time timers that are currently in-flight.
+        */
+       private final KeyGroupedInternalPriorityQueue<TimerHeapInternalTimer<K, 
N>> processingTimeTimersQueue;
+
+       /**
+        * Event time timers that are currently in-flight.
+        */
+       private final KeyGroupedInternalPriorityQueue<TimerHeapInternalTimer<K, 
N>> eventTimeTimersQueue;
+
+       /**
+        * The local event time, as denoted by the last received
+        * {@link org.apache.flink.streaming.api.watermark.Watermark Watermark}.
+        */
+       private long currentWatermark = Long.MIN_VALUE;
+
+       private final Triggerable<K, N> triggerTarget;
+
+       private K currentKey;
+
+       BatchExecutionInternalTimeService(
+                       ProcessingTimeService processingTimeService,
+                       Triggerable<K, N> triggerTarget) {
+
+               this.processingTimeService = 
checkNotNull(processingTimeService);
+               this.triggerTarget = checkNotNull(triggerTarget);
+
+               this.processingTimeTimersQueue = new 
BatchExecutionInternalPriorityQueueSet<>(
+                       PriorityComparator.forPriorityComparableObjects(),
+                       128
+               );
+               this.eventTimeTimersQueue = new 
BatchExecutionInternalPriorityQueueSet<>(
+                       PriorityComparator.forPriorityComparableObjects(),
+                       128
+               );
+       }
+
+       @Override
+       public long currentProcessingTime() {
+               return processingTimeService.getCurrentProcessingTime();
+       }
+
+       @Override
+       public long currentWatermark() {
+               return currentWatermark;
+       }
+
+       @Override
+       public void registerProcessingTimeTimer(N namespace, long time) {
+               processingTimeTimersQueue.add(new 
TimerHeapInternalTimer<>(time, currentKey, namespace));
+       }
+
+       @Override
+       public void registerEventTimeTimer(N namespace, long time) {
+               eventTimeTimersQueue.add(new TimerHeapInternalTimer<>(time, 
currentKey, namespace));
+       }
+
+       @Override
+       public void deleteProcessingTimeTimer(N namespace, long time) {
+               processingTimeTimersQueue.remove(new 
TimerHeapInternalTimer<>(time, currentKey, namespace));
+       }
+
+       @Override
+       public void deleteEventTimeTimer(N namespace, long time) {
+               eventTimeTimersQueue.remove(new TimerHeapInternalTimer<>(time, 
currentKey, namespace));
+       }
+
+       @Override
+       public void forEachEventTimeTimer(BiConsumerWithException<N, Long, 
Exception> consumer) {
+               throw new UnsupportedOperationException(
+                       "The BatchExecutionInternalTimeService should not be 
used in State Processor API.");
+       }
+
+       @Override
+       public void forEachProcessingTimeTimer(BiConsumerWithException<N, Long, 
Exception> consumer) {
+               throw new UnsupportedOperationException(
+                       "The BatchExecutionInternalTimeService should not be 
used in State Processor API.");
+       }
+
+       public void setCurrentKey(K currentKey) throws Exception {

Review comment:
       This relies on `setCurrentKey` only being called for key changes, not on 
every element, right?




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