[GitHub] tysonnorris commented on a change in pull request #3562: ArtifactStore implementation for CosmosDB

[GitBox <gi...@apache.org>]

tysonnorris commented on a change in pull request #3562: ArtifactStore implementation for CosmosDB
URL: https://github.com/apache/incubator-openwhisk/pull/3562#discussion_r184559077
 
 

 ##########
 File path: common/scala/src/main/scala/whisk/core/database/cosmosdb/CosmosDBArtifactStoreProvider.scala
 ##########
 @@ -0,0 +1,104 @@
+/*
+ * 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 whisk.core.database.cosmosdb
+
+import java.io.Closeable
+
+import akka.actor.ActorSystem
+import akka.stream.ActorMaterializer
+import com.microsoft.azure.cosmosdb.rx.AsyncDocumentClient
+import spray.json.RootJsonFormat
+import whisk.common.Logging
+import whisk.core.database._
+import pureconfig._
+import whisk.core.ConfigKeys
+import whisk.core.database.cosmosdb.CosmosDBUtil.createClient
+import whisk.core.entity.{DocumentReader, WhiskActivation, WhiskAuth, WhiskEntity}
+
+import scala.reflect.ClassTag
+
+case class CosmosDBConfig(endpoint: String, key: String, db: String)
+
+case class ClientHolder(client: AsyncDocumentClient) extends Closeable {
+  override def close(): Unit = client.close()
+}
+
+object CosmosDBArtifactStoreProvider extends ArtifactStoreProvider {
+  type DocumentClientRef = ReferenceCounted[ClientHolder]#CountedReference
+  private lazy val config = loadConfigOrThrow[CosmosDBConfig](ConfigKeys.cosmosdb)
+  private var clientRef: ReferenceCounted[ClientHolder] = _
+
+  override def makeStore[D <: DocumentSerializer: ClassTag](useBatching: Boolean)(
+    implicit jsonFormat: RootJsonFormat[D],
+    docReader: DocumentReader,
+    actorSystem: ActorSystem,
+    logging: Logging,
+    materializer: ActorMaterializer): ArtifactStore[D] = {
+    makeStoreForClient(config, useBatching, getOrCreateReference(config))
+  }
+
+  def makeStore[D <: DocumentSerializer: ClassTag](config: CosmosDBConfig, useBatching: Boolean)(
+    implicit jsonFormat: RootJsonFormat[D],
+    docReader: DocumentReader,
+    actorSystem: ActorSystem,
+    logging: Logging,
+    materializer: ActorMaterializer): ArtifactStore[D] = {
+
+    makeStoreForClient(config, useBatching, createReference(config).reference())
+  }
+
+  private def makeStoreForClient[D <: DocumentSerializer: ClassTag](config: CosmosDBConfig,
+                                                                    useBatching: Boolean,
+                                                                    clientRef: DocumentClientRef)(
+    implicit jsonFormat: RootJsonFormat[D],
+    docReader: DocumentReader,
+    actorSystem: ActorSystem,
+    logging: Logging,
+    materializer: ActorMaterializer): ArtifactStore[D] = {
+
+    val classTag = implicitly[ClassTag[D]]
+    val (dbName, handler, viewMapper) = handlerAndMapper(classTag)
+
+    new CosmosDBArtifactStore(dbName, config, clientRef, handler, viewMapper)
+  }
+
+  private def handlerAndMapper[D](entityType: ClassTag[D])(
+    implicit actorSystem: ActorSystem,
+    logging: Logging,
+    materializer: ActorMaterializer): (String, DocumentHandler, CosmosDBViewMapper) = {
+    entityType.runtimeClass match {
+      case x if x == classOf[WhiskEntity] =>
+        ("whisks", WhisksHandler, WhisksViewMapper)
+      case x if x == classOf[WhiskActivation] =>
+        ("activations", ActivationHandler, ActivationViewMapper)
+      case x if x == classOf[WhiskAuth] =>
+        ("subjects", SubjectHandler, SubjectViewMapper)
+    }
+  }
+
+  private def getOrCreateReference(config: CosmosDBConfig) = synchronized {
 
 Review comment:
   I get the feeling this reference is special - can you outline the goals of `ReferenceCounted` and `synchronized`?
   
   nm: I see the "Shutdown Handling" comment

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