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https://issues.apache.org/jira/browse/FLINK-3674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591263#comment-15591263
]
ASF GitHub Bot commented on FLINK-3674:
---------------------------------------
Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/2570#discussion_r84237459
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/HeapInternalTimerService.java
---
@@ -0,0 +1,317 @@
+/*
+ * 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.api.common.typeutils.TypeSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback;
+import org.apache.flink.streaming.runtime.tasks.ProcessingTimeService;
+import org.apache.flink.util.InstantiationUtil;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.HashSet;
+import java.util.PriorityQueue;
+import java.util.Set;
+import java.util.concurrent.ScheduledFuture;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * {@link InternalTimerService} that stores timers on the Java heap.
+ */
+public class HeapInternalTimerService<K, N> implements
InternalTimerService<N>, ProcessingTimeCallback {
+
+ private final TypeSerializer<K> keySerializer;
+
+ private final TypeSerializer<N> namespaceSerializer;
+
+ private final ProcessingTimeService processingTimeService;
+
+ private long currentWatermark = Long.MIN_VALUE;
+
+ private final org.apache.flink.streaming.api.operators.Triggerable<K,
N> triggerTarget;
+
+ private final KeyContext keyContext;
+
+ /**
+ * Processing time timers that are currently in-flight.
+ */
+ private final PriorityQueue<InternalTimer<K, N>>
processingTimeTimersQueue;
+ private final Set<InternalTimer<K, N>> processingTimeTimers;
+
+ protected ScheduledFuture<?> nextTimer = null;
+
+ /**
+ * Currently waiting watermark callbacks.
+ */
+ private final Set<InternalTimer<K, N>> watermarkTimers;
+ private final PriorityQueue<InternalTimer<K, N>> watermarkTimersQueue;
+
+ public HeapInternalTimerService(
+ TypeSerializer<K> keySerializer,
+ TypeSerializer<N> namespaceSerializer,
+ org.apache.flink.streaming.api.operators.Triggerable<K,
N> triggerTarget,
+ KeyContext keyContext,
+ ProcessingTimeService processingTimeService) {
+ this.keySerializer = checkNotNull(keySerializer);
+ this.namespaceSerializer = checkNotNull(namespaceSerializer);
+ this.triggerTarget = checkNotNull(triggerTarget);
+ this.keyContext = keyContext;
+ this.processingTimeService =
checkNotNull(processingTimeService);
+
+ watermarkTimers = new HashSet<>();
--- End diff --
I am wondering if it would be better to rename this to `EventTimeTimers`.
This plays well with `processingTimeTimers` and also it indicates what we are
talking about. We have event time whose "clock-tiks" are the Watermarks and
processing time whose clock tiks are the wall clock ones.
> Add an interface for Time aware User Functions
> ----------------------------------------------
>
> Key: FLINK-3674
> URL: https://issues.apache.org/jira/browse/FLINK-3674
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Affects Versions: 1.0.0
> Reporter: Stephan Ewen
> Assignee: Aljoscha Krettek
>
> I suggest to add an interface that UDFs can implement, which will let them be
> notified upon watermark updates.
> Example usage:
> {code}
> public interface EventTimeFunction {
> void onWatermark(Watermark watermark);
> }
> public class MyMapper implements MapFunction<String, String>,
> EventTimeFunction {
> private long currentEventTime = Long.MIN_VALUE;
> public String map(String value) {
> return value + " @ " + currentEventTime;
> }
> public void onWatermark(Watermark watermark) {
> currentEventTime = watermark.getTimestamp();
> }
> }
> {code}
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