ms/blueprintsprocessor/functions/message-prioritizaion/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/message/prioritization/kafka/MessagePrioritizationConsumer.kt

   1 /*
   2  * Copyright © 2018-2019 AT&T Intellectual Property.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.onap.ccsdk.cds.blueprintsprocessor.functions.message.prioritization.kafka
  18
  19 import org.apache.kafka.common.serialization.Serdes
  20 import org.apache.kafka.streams.Topology
  21 import org.onap.ccsdk.cds.blueprintsprocessor.functions.message.prioritization.MessagePrioritizationConstants
  22 import org.onap.ccsdk.cds.blueprintsprocessor.functions.message.prioritization.PrioritizationConfiguration
  23 import org.onap.ccsdk.cds.blueprintsprocessor.functions.message.prioritization.utils.MessageProcessorUtils.bluePrintProcessorSupplier
  24 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaStreamsBasicAuthConsumerProperties
  25 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageConsumerProperties
  26 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BluePrintMessageLibPropertyService
  27 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BlueprintMessageConsumerService
  28 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.KafkaStreamConsumerFunction
  29 import org.onap.ccsdk.cds.controllerblueprints.core.logger
  30 import org.onap.ccsdk.cds.controllerblueprints.core.splitCommaAsList
  31
  32 open class MessagePrioritizationConsumer(
  33     private val bluePrintMessageLibPropertyService: BluePrintMessageLibPropertyService
  34 ) {
  35
  36     private val log = logger(MessagePrioritizationConsumer::class)
  37
  38     lateinit var streamingConsumerService: BlueprintMessageConsumerService
  39
  40     open fun consumerService(selector: String): BlueprintMessageConsumerService {
  41         return bluePrintMessageLibPropertyService
  42             .blueprintMessageConsumerService(selector)
  43     }
  44
  45     open fun kafkaStreamConsumerFunction(prioritizationConfiguration: PrioritizationConfiguration):
  46         KafkaStreamConsumerFunction {
  47         return object : KafkaStreamConsumerFunction {
  48
  49             override suspend fun createTopology(
  50                 messageConsumerProperties: MessageConsumerProperties,
  51                 additionalConfig: Map<String, Any>?
  52             ): Topology {
  53
  54                 val topology = Topology()
  55                 val kafkaStreamsBasicAuthConsumerProperties = messageConsumerProperties
  56                     as KafkaStreamsBasicAuthConsumerProperties
  57
  58                 val topics = kafkaStreamsBasicAuthConsumerProperties.topic.splitCommaAsList()
  59                 log.info("Consuming prioritization topics($topics)")
  60
  61                 topology.addSource(MessagePrioritizationConstants.SOURCE_INPUT, *topics.toTypedArray())
  62
  63                 topology.addProcessor(
  64                     MessagePrioritizationConstants.PROCESSOR_PRIORITIZE,
  65                     bluePrintProcessorSupplier<ByteArray, ByteArray>(
  66                         MessagePrioritizationConstants.PROCESSOR_PRIORITIZE,
  67                         prioritizationConfiguration
  68                     ),
  69                     MessagePrioritizationConstants.SOURCE_INPUT
  70                 )
  71
  72                 /** To receive completed and error messages */
  73                 topology.addSink(
  74                     MessagePrioritizationConstants.SINK_OUTPUT,
  75                     prioritizationConfiguration.outputTopic,
  76                     Serdes.String().serializer(), MessagePrioritizationSerde().serializer(),
  77                     MessagePrioritizationConstants.PROCESSOR_PRIORITIZE
  78                 )
  79
  80                 // Output will be sent to the group-output topic from Processor API
  81                 return topology
  82             }
  83         }
  84     }
  85
  86     suspend fun startConsuming(prioritizationConfiguration: PrioritizationConfiguration) {
  87         streamingConsumerService = consumerService(prioritizationConfiguration.inputTopicSelector)
  88
  89         // Dynamic Consumer Function to create Topology
  90         val consumerFunction = kafkaStreamConsumerFunction(prioritizationConfiguration)
  91         streamingConsumerService.consume(null, consumerFunction)
  92     }
  93
  94     suspend fun shutDown() {
  95         if (streamingConsumerService != null) {
  96             streamingConsumerService.shutDown()
  97         }
  98     }
  99 }