Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3919#discussion_r116740828
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/triggers/CountTriggerWithCleanupState.scala
---
@@ -0,0 +1,146 @@
+/*
+ * 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.table.runtime.triggers
+
+import java.lang.{Long => JLong}
+
+import org.apache.flink.api.common.functions.ReduceFunction
+import org.apache.flink.api.common.state._
+import
org.apache.flink.streaming.api.windowing.triggers.Trigger.TriggerContext
+import org.apache.flink.streaming.api.windowing.triggers.{Trigger,
TriggerResult}
+import org.apache.flink.streaming.api.windowing.windows.Window
+import org.apache.flink.table.api.{StreamQueryConfig, Types}
+import
org.apache.flink.table.runtime.triggers.CountTriggerWithCleanupState.Sum
+
+class CountTriggerWithCleanupState[W <: Window](queryConfig:
StreamQueryConfig, maxCount: Long)
+ extends Trigger[Any, W] {
+
+ private val serialVersionUID: Long = 1L
+
+ protected val minRetentionTime: Long =
queryConfig.getMinIdleStateRetentionTime
+ protected val maxRetentionTime: Long =
queryConfig.getMaxIdleStateRetentionTime
+ protected val stateCleaningEnabled: Boolean = minRetentionTime > 1
+
+ private val stateDesc: ReducingStateDescriptor[JLong] =
+ new ReducingStateDescriptor[JLong]("count", new Sum, Types.LONG)
+
+ private val cleanupStateDesc: ValueStateDescriptor[JLong] =
+ new ValueStateDescriptor[JLong]("countCleanup", Types.LONG)
+
+ override def canMerge: Boolean = true
+
+ override def onMerge(window: W, ctx: Trigger.OnMergeContext) {
+ ctx.mergePartitionedState(stateDesc)
+ }
+
+ override def toString: String = "CountTriggerWithCleanupState(" +
+ "minIdleStateRetentionTime=" +
queryConfig.getMinIdleStateRetentionTime + ", " +
+ "maxIdleStateRetentionTime=" +
queryConfig.getMaxIdleStateRetentionTime + ", " +
+ "maxCount=" + maxCount + ")"
+
+ override def onElement(
+ element: Any,
+ timestamp: Long,
+ window: W,
+ ctx: TriggerContext): TriggerResult = {
+
+ val currentTime = ctx.getCurrentProcessingTime
+
+ // register cleanup timer
+ if (stateCleaningEnabled) {
+ // last registered timer
+ val curCleanupTime =
ctx.getPartitionedState(cleanupStateDesc).value()
+
+ // check if a cleanup timer is registered and
+ // that the current cleanup timer won't delete state we need to keep
+ if (curCleanupTime == null || (currentTime + minRetentionTime) >
curCleanupTime) {
+ // we need to register a new (later) timer
+ val cleanupTime = currentTime + maxRetentionTime
+ // register timer and remember clean-up time
+ ctx.registerProcessingTimeTimer(cleanupTime)
+
+ if (null != curCleanupTime) {
+ ctx.deleteProcessingTimeTimer(curCleanupTime)
+ }
+
+ ctx.getPartitionedState(cleanupStateDesc).update(cleanupTime)
+ }
+ }
+
+ val count: ReducingState[JLong] = ctx.getPartitionedState(stateDesc)
+ count.add(1L)
+
+ if (count.get >= maxCount) {
+ count.clear()
+ return TriggerResult.FIRE
+ }
+
+ return TriggerResult.CONTINUE
+ }
+
+ override def onProcessingTime(
+ time: Long,
+ window: W,
+ ctx: TriggerContext): TriggerResult = {
+
+ if (stateCleaningEnabled) {
+ val cleanupTime = ctx.getPartitionedState(cleanupStateDesc).value()
+ // check that the triggered timer is the last registered processing
time timer.
+ if (null != cleanupTime && time == cleanupTime) {
+ clear(window, ctx)
+ return TriggerResult.FIRE_AND_PURGE
+ }
+ }
+ return TriggerResult.CONTINUE
--- End diff --
remove `return`
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