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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018 NOKIA
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.collectors.veshv.model
import arrow.core.Option
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.ves.VesEventOuterClass.CommonEventHeader
data class Routing(val routes: List<Route>) {
fun routeFor(commonHeader: CommonEventHeader): Option<Route> =
Option.fromNullable(routes.find { it.applies(commonHeader) }).also {
if (it.isEmpty()) {
logger.debug { "No route is defined for domain: ${commonHeader.domain}" }
}
}
companion object {
private val logger = Logger(Routing::class)
}
}
data class Route(val domain: String, val targetTopic: String, val partitioning: (CommonEventHeader) -> Int) {
fun applies(commonHeader: CommonEventHeader) = commonHeader.domain == domain
operator fun invoke(message: VesMessage): RoutedMessage =
RoutedMessage(targetTopic, partitioning(message.header), message)
}
/*
Configuration DSL
*/
fun routing(init: RoutingBuilder.() -> Unit): RoutingBuilder {
val conf = RoutingBuilder()
conf.init()
return conf
}
class RoutingBuilder {
private val routes: MutableList<RouteBuilder> = mutableListOf()
fun defineRoute(init: RouteBuilder.() -> Unit): RouteBuilder {
val rule = RouteBuilder()
rule.init()
routes.add(rule)
return rule
}
fun build() = Routing(routes.map { it.build() }.toList())
}
class RouteBuilder {
private lateinit var domain: String
private lateinit var targetTopic: String
private lateinit var partitioning: (CommonEventHeader) -> Int
fun fromDomain(domain: String) {
this.domain = domain
}
fun toTopic(targetTopic: String) {
this.targetTopic = targetTopic
}
fun withFixedPartitioning(num: Int = 0) {
partitioning = { num }
}
fun build() = Route(domain, targetTopic, partitioning)
}
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