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Subject [GitHub] pnowojski commented on a change in pull request #6871: [FLINK-10583][table] Add base TwoInputStreamOperator with TTL operator.
Date Wed, 17 Oct 2018 15:01:03 GMT
pnowojski commented on a change in pull request #6871: [FLINK-10583][table] Add base TwoInputStreamOperator
with TTL operator.
URL: https://github.com/apache/flink/pull/6871#discussion_r225956138
 
 

 ##########
 File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/AbstractTwoInputStreamOperatorWithTTL.scala
 ##########
 @@ -0,0 +1,178 @@
+/*
+ * 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.join
+
+import java.lang.{Long => JLong}
+
+import org.apache.flink.annotation.PublicEvolving
+import org.apache.flink.api.common.state.{ValueState, ValueStateDescriptor}
+import org.apache.flink.runtime.state.{VoidNamespace, VoidNamespaceSerializer}
+import org.apache.flink.streaming.api.SimpleTimerService
+import org.apache.flink.streaming.api.operators.{AbstractStreamOperator, InternalTimer, Triggerable,
TwoInputStreamOperator}
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord
+import org.apache.flink.table.api.{StreamQueryConfig, Types}
+import org.apache.flink.table.runtime.types.CRow
+
+/**
+  * An abstract [[TwoInputStreamOperator]] that allows its subclasses to clean
+  * up their state based on a TTL. This TTL should be specified in the provided
+  * [[StreamQueryConfig]].
+  *
+  * For each known key, this operator registers a timer (in processing time) to
+  * fire after the TTL expires. When the timer fires, the subclass can decide which
+  * state to cleanup and what further action to take.
+  *
+  * This class takes care of maintaining at most one timer per key.
+  */
+@PublicEvolving
+abstract class AbstractTwoInputStreamOperatorWithTTL(
+    queryConfig: StreamQueryConfig)
+  extends AbstractStreamOperator[CRow]
+  with TwoInputStreamOperator[CRow, CRow, CRow]
+  with Triggerable[Any, VoidNamespace] {
+
+  private val minRetentionTime: Long = queryConfig.getMinIdleStateRetentionTime
+  private val maxRetentionTime: Long = queryConfig.getMaxIdleStateRetentionTime
+  private val stateCleaningEnabled: Boolean = minRetentionTime > 1
+
+  private val ACTIVE_CLEANUP_TIMESTAMP = "cleanup-timestamp"
+  private val TIMERS_STATE_NAME = "timers"
+
+  // the latest registered cleanup timer
+  private var cleanupTimeState: ValueState[JLong] = _
+
+  protected var timerService: SimpleTimerService = _
+
+  override final def open(): Unit = {
+
+    initializeTimerService()
+
+    if (stateCleaningEnabled) {
+      val inputCntDescriptor: ValueStateDescriptor[JLong] =
+        new ValueStateDescriptor[JLong](ACTIVE_CLEANUP_TIMESTAMP, Types.LONG)
+      cleanupTimeState = getRuntimeContext.getState(inputCntDescriptor)
+    }
+
+    onOpen()
+  }
+
+  private def initializeTimerService(): Unit = {
+
+    val internalTimerService = getInternalTimerService(
+      TIMERS_STATE_NAME,
+      VoidNamespaceSerializer.INSTANCE,
+      this)
+
+    timerService = new SimpleTimerService(internalTimerService)
+  }
+
+  override final def processElement1(element: StreamRecord[CRow]): Unit = {
+    onProcessElement1(element)
+    registerProcessingCleanupTimer()
+  }
+
+  override final def processElement2(element: StreamRecord[CRow]): Unit = {
+    onProcessElement2(element)
+    registerProcessingCleanupTimer()
+  }
+
+  private def registerProcessingCleanupTimer(): Unit = {
+    if (stateCleaningEnabled) {
+      val currentProcessingTime = timerService.currentProcessingTime()
+      val currentCleanupTime = cleanupTimeState.value()
 
 Review comment:
   I would avoid nulls and wrap this variable with `Option` and pass `Option` to the `updateCleanupTimer`
method. Handling nullable variables without compilation errors enables is very dangerous and
error prone.

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