[GitHub] [openwhisk] chetanmeh commented on a change in pull request #4677: Switch to Cosmos SDK v3 for Cache Invalidator Service

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chetanmeh commented on a change in pull request #4677: Switch to Cosmos SDK v3 for Cache Invalidator Service
URL: https://github.com/apache/openwhisk/pull/4677#discussion_r333183870
 
 

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 File path: core/cosmosdb/cache-invalidator/src/main/scala/org/apache/openwhisk/core/database/cosmosdb/cache/ChangeFeedConsumer.scala
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 @@ -0,0 +1,119 @@
+/*
+ * 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.openwhisk.core.database.cosmosdb.cache
+
+import java.util
+
+import akka.Done
+import akka.event.slf4j.SLF4JLogging
+import com.azure.data.cosmos.internal.changefeed.implementation.ChangeFeedProcessorBuilderImpl
+import com.azure.data.cosmos.internal.changefeed.{ChangeFeedObserverCloseReason, ChangeFeedObserverContext}
+import com.azure.data.cosmos.{
+  ChangeFeedProcessor,
+  ChangeFeedProcessorOptions,
+  ConnectionPolicy,
+  CosmosClient,
+  CosmosContainer,
+  CosmosItemProperties
+}
+import reactor.core.publisher.Mono
+
+import scala.collection.JavaConverters._
+import scala.collection.immutable.Seq
+import scala.compat.java8.FutureConverters._
+import scala.concurrent.{ExecutionContext, Future}
+
+trait ChangeFeedObserver {
+  def process(context: ChangeFeedObserverContext, docs: Seq[CosmosItemProperties]): Future[Done]
+}
+
+class ChangeFeedConsumer(collName: String, config: CacheInvalidatorConfig, observer: ChangeFeedObserver)(
+  implicit ec: ExecutionContext)
+    extends SLF4JLogging {
+  import ChangeFeedConsumer._
+
+  log.info(s"Watching changes in $collName with lease managed in ${config.feedConfig.leaseCollection}")
+
+  private val clients = scala.collection.mutable.Map[ConnectionInfo, CosmosClient]().withDefault(createCosmosClient)
+  private val targetContainer = getContainer(collName)
+  private val leaseContainer = getContainer(config.feedConfig.leaseCollection, createIfNotExist = true)
+  private val (processor, startFuture) = {
+    val clusterId = config.invalidatorConfig.clusterId
+    val prefix = clusterId.map(id => s"$id-$collName").getOrElse(collName)
+
+    val feedOpts = new ChangeFeedProcessorOptions
+    feedOpts.leasePrefix(prefix)
+
+    val builder = ChangeFeedProcessor.Builder
+      .hostName(config.feedConfig.hostname)
+      .feedContainer(targetContainer)
+      .leaseContainer(leaseContainer)
+      .options(feedOpts)
+      .asInstanceOf[ChangeFeedProcessorBuilderImpl] //observerFactory is not exposed hence need to cast to impl
 
 Review comment:
   Opened Azure/azure-sdk-for-java#5744 to expose the proper api so that we do not have to rely on implementation details

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