ms/blueprintsprocessor/functions/message-prioritizaion/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/message/prioritization/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
  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.topology.MessagePrioritizationSerde
  22 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaStreamsBasicAuthConsumerProperties
  23 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageConsumerProperties
  24 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BluePrintMessageLibPropertyService
  25 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BlueprintMessageConsumerService
  26 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.KafkaStreamConsumerFunction
  27 import org.onap.ccsdk.cds.controllerblueprints.core.logger
  28
  29 open class MessagePrioritizationConsumer(
  30         private val bluePrintMessageLibPropertyService: BluePrintMessageLibPropertyService) {
  31
  32     private val log = logger(MessagePrioritizationConsumer::class)
  33
  34     lateinit var streamingConsumerService: BlueprintMessageConsumerService
  35
  36     open fun consumerService(selector: String): BlueprintMessageConsumerService {
  37         return bluePrintMessageLibPropertyService
  38                 .blueprintMessageConsumerService(selector)
  39     }
  40
  41     open fun kafkaStreamConsumerFunction(prioritizationConfiguration: PrioritizationConfiguration)
  42             : KafkaStreamConsumerFunction {
  43         return object : KafkaStreamConsumerFunction {
  44
  45             override suspend fun createTopology(messageConsumerProperties: MessageConsumerProperties,
  46                                                 additionalConfig: Map<String, Any>?): Topology {
  47
  48                 val topology = Topology()
  49                 val kafkaStreamsBasicAuthConsumerProperties = messageConsumerProperties
  50                         as KafkaStreamsBasicAuthConsumerProperties
  51
  52                 val topics = kafkaStreamsBasicAuthConsumerProperties.topic.split(",")
  53                 log.info("Consuming prioritization topics($topics)")
  54
  55                 topology.addSource(MessagePrioritizationConstants.SOURCE_INPUT, *topics.toTypedArray())
  56
  57                 topology.addProcessor(MessagePrioritizationConstants.PROCESSOR_PRIORITIZE,
  58                         bluePrintProcessorSupplier<ByteArray, ByteArray>(MessagePrioritizationConstants.PROCESSOR_PRIORITIZE,
  59                                 prioritizationConfiguration),
  60                         MessagePrioritizationConstants.SOURCE_INPUT)
  61
  62                 topology.addProcessor(MessagePrioritizationConstants.PROCESSOR_AGGREGATE,
  63                         bluePrintProcessorSupplier<String, String>(MessagePrioritizationConstants.PROCESSOR_AGGREGATE,
  64                                 prioritizationConfiguration),
  65                         MessagePrioritizationConstants.PROCESSOR_PRIORITIZE)
  66
  67                 topology.addProcessor(MessagePrioritizationConstants.PROCESSOR_OUTPUT,
  68                         bluePrintProcessorSupplier<String, String>(MessagePrioritizationConstants.PROCESSOR_OUTPUT,
  69                                 prioritizationConfiguration),
  70                         MessagePrioritizationConstants.PROCESSOR_AGGREGATE)
  71
  72                 topology.addSink(MessagePrioritizationConstants.SINK_EXPIRED,
  73                         prioritizationConfiguration.expiredTopic,
  74                         Serdes.String().serializer(), MessagePrioritizationSerde().serializer(),
  75                         MessagePrioritizationConstants.PROCESSOR_PRIORITIZE)
  76
  77                 topology.addSink(MessagePrioritizationConstants.SINK_OUTPUT,
  78                         prioritizationConfiguration.outputTopic,
  79                         Serdes.String().serializer(), MessagePrioritizationSerde().serializer(),
  80                         MessagePrioritizationConstants.PROCESSOR_OUTPUT)
  81
  82                 // Output will be sent to the group-output topic from Processor API
  83                 return topology
  84             }
  85         }
  86     }
  87
  88     suspend fun startConsuming(prioritizationConfiguration: PrioritizationConfiguration) {
  89         streamingConsumerService = consumerService(prioritizationConfiguration.inputTopicSelector)
  90
  91         // Dynamic Consumer Function to create Topology
  92         val consumerFunction = kafkaStreamConsumerFunction(prioritizationConfiguration)
  93         streamingConsumerService.consume(null, consumerFunction)
  94     }
  95
  96     suspend fun shutDown() {
  97         if (streamingConsumerService != null) {
  98             streamingConsumerService.shutDown()
  99         }
 100     }
 101 }