ms/blueprintsprocessor/modules/inbounds/selfservice-api/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/selfservice/api/BluePrintProcessingKafkaConsumer.kt

   1 /*
   2  *  Copyright © 2019 IBM.
   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.selfservice.api
  18
  19 import kotlinx.coroutines.channels.consumeEach
  20 import kotlinx.coroutines.launch
  21 import kotlinx.coroutines.runBlocking
  22 import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceInput
  23 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BluePrintMessageLibPropertyService
  24 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BlueprintMessageConsumerService
  25 import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
  26 import org.onap.ccsdk.cds.controllerblueprints.core.jsonAsType
  27 import org.onap.ccsdk.cds.controllerblueprints.core.logger
  28 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
  29 import org.springframework.boot.context.event.ApplicationReadyEvent
  30 import org.springframework.context.event.EventListener
  31 import org.springframework.stereotype.Service
  32 import java.util.concurrent.Phaser
  33 import javax.annotation.PreDestroy
  34
  35 @ConditionalOnProperty(name = ["blueprintsprocessor.messageconsumer.self-service-api.kafkaEnable"],
  36         havingValue = "true")
  37 @Service
  38 open class BluePrintProcessingKafkaConsumer(
  39         private val bluePrintMessageLibPropertyService: BluePrintMessageLibPropertyService,
  40         private val executionServiceHandler: ExecutionServiceHandler) {
  41
  42     val log = logger(BluePrintProcessingKafkaConsumer::class)
  43
  44     private val ph = Phaser(1)
  45
  46     private lateinit var blueprintMessageConsumerService: BlueprintMessageConsumerService
  47
  48     companion object {
  49         const val CONSUMER_SELECTOR = "self-service-api"
  50         const val PRODUCER_SELECTOR = "self-service-api"
  51     }
  52
  53     @EventListener(ApplicationReadyEvent::class)
  54     fun setupMessageListener() = runBlocking {
  55         try {
  56             log.info("Setting up message consumer($CONSUMER_SELECTOR) and " +
  57                     "message producer($PRODUCER_SELECTOR)...")
  58
  59             /** Get the Message Consumer Service **/
  60             blueprintMessageConsumerService = try {
  61                 bluePrintMessageLibPropertyService
  62                         .blueprintMessageConsumerService(CONSUMER_SELECTOR)
  63             } catch (e: Exception) {
  64                 throw BluePrintProcessorException("failed to create consumer service ${e.message}")
  65             }
  66
  67             /** Get the Message Producer Service **/
  68             val blueprintMessageProducerService = try {
  69                 bluePrintMessageLibPropertyService
  70                         .blueprintMessageProducerService(PRODUCER_SELECTOR)
  71             } catch (e: Exception) {
  72                 throw BluePrintProcessorException("failed to create producer service ${e.message}")
  73             }
  74
  75             launch {
  76                 /** Subscribe to the consumer topics */
  77                 val additionalConfig: MutableMap<String, Any> = hashMapOf()
  78                 val channel = blueprintMessageConsumerService.subscribe(additionalConfig)
  79                 channel.consumeEach { message ->
  80                     launch {
  81                         try {
  82                             ph.register()
  83                             log.trace("Consumed Message : $message")
  84                             val executionServiceInput = message.jsonAsType<ExecutionServiceInput>()
  85                             val executionServiceOutput = executionServiceHandler.doProcess(executionServiceInput)
  86                             //TODO("In future, Message publisher configuration vary with respect to request")
  87                             /** Send the response message */
  88                             blueprintMessageProducerService.sendMessage(executionServiceOutput)
  89                         } catch (e: Exception) {
  90                             log.error("failed in processing the consumed message : $message", e)
  91                         }
  92                         finally {
  93                             ph.arriveAndDeregister()
  94                         }
  95                     }
  96                 }
  97             }
  98         } catch (e: Exception) {
  99             log.error("failed to start message consumer($CONSUMER_SELECTOR) and " +
 100                     "message producer($PRODUCER_SELECTOR) ", e)
 101         }
 102     }
 103
 104     @PreDestroy
 105     fun shutdownMessageListener() = runBlocking {
 106         try {
 107             log.info("Shutting down message consumer($CONSUMER_SELECTOR) and " +
 108                     "message producer($PRODUCER_SELECTOR)...")
 109             blueprintMessageConsumerService.shutDown()
 110             ph.arriveAndAwaitAdvance()
 111         } catch (e: Exception) {
 112             log.error("failed to shutdown message listener($CONSUMER_SELECTOR)", e)
 113         }
 114     }
 115
 116 }