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(
  36     name = ["blueprintsprocessor.messageconsumer.self-service-api.kafkaEnable"],
  37     havingValue = "true"
  38 )
  39 @Service
  40 open class BluePrintProcessingKafkaConsumer(
  41     private val bluePrintMessageLibPropertyService: BluePrintMessageLibPropertyService,
  42     private val executionServiceHandler: ExecutionServiceHandler
  43 ) {
  44
  45     val log = logger(BluePrintProcessingKafkaConsumer::class)
  46
  47     private val ph = Phaser(1)
  48
  49     private lateinit var blueprintMessageConsumerService: BlueprintMessageConsumerService
  50
  51     companion object {
  52         const val CONSUMER_SELECTOR = "self-service-api"
  53         const val PRODUCER_SELECTOR = "self-service-api"
  54     }
  55
  56     @EventListener(ApplicationReadyEvent::class)
  57     fun setupMessageListener() = runBlocking {
  58         try {
  59             log.info(
  60                 "Setting up message consumer($CONSUMER_SELECTOR) and " +
  61                         "message producer($PRODUCER_SELECTOR)..."
  62             )
  63
  64             /** Get the Message Consumer Service **/
  65             blueprintMessageConsumerService = try {
  66                 bluePrintMessageLibPropertyService
  67                     .blueprintMessageConsumerService(CONSUMER_SELECTOR)
  68             } catch (e: Exception) {
  69                 throw BluePrintProcessorException("failed to create consumer service ${e.message}")
  70             }
  71
  72             /** Get the Message Producer Service **/
  73             val blueprintMessageProducerService = try {
  74                 bluePrintMessageLibPropertyService
  75                     .blueprintMessageProducerService(PRODUCER_SELECTOR)
  76             } catch (e: Exception) {
  77                 throw BluePrintProcessorException("failed to create producer service ${e.message}")
  78             }
  79
  80             launch {
  81                 /** Subscribe to the consumer topics */
  82                 val additionalConfig: MutableMap<String, Any> = hashMapOf()
  83                 val channel = blueprintMessageConsumerService.subscribe(additionalConfig)
  84                 channel.consumeEach { message ->
  85                     launch {
  86                         try {
  87                             ph.register()
  88                             log.trace("Consumed Message : $message")
  89                             val executionServiceInput = message.jsonAsType<ExecutionServiceInput>()
  90                             val executionServiceOutput = executionServiceHandler.doProcess(executionServiceInput)
  91                             // TODO("In future, Message publisher configuration vary with respect to request")
  92                             /** Send the response message */
  93                             blueprintMessageProducerService.sendMessage(executionServiceOutput)
  94                         } catch (e: Exception) {
  95                             log.error("failed in processing the consumed message : $message", e)
  96                         } finally {
  97                             ph.arriveAndDeregister()
  98                         }
  99                     }
 100                 }
 101             }
 102         } catch (e: Exception) {
 103             log.error(
 104                 "failed to start message consumer($CONSUMER_SELECTOR) and " +
 105                         "message producer($PRODUCER_SELECTOR) ", e
 106             )
 107         }
 108     }
 109
 110     @PreDestroy
 111     fun shutdownMessageListener() = runBlocking {
 112         try {
 113             log.info(
 114                 "Shutting down message consumer($CONSUMER_SELECTOR) and " +
 115                         "message producer($PRODUCER_SELECTOR)..."
 116             )
 117             blueprintMessageConsumerService.shutDown()
 118             ph.arriveAndAwaitAdvance()
 119         } catch (e: Exception) {
 120             log.error("failed to shutdown message listener($CONSUMER_SELECTOR)", e)
 121         }
 122     }
 123 }