com.sksamuel.cohort.lettuce.RedisClusterWarmup.kt Maven / Gradle / Ivy

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Ktor Actuator

There is a newer version: 2.6.0

package com.sksamuel.cohort.lettuce

import com.sksamuel.cohort.WarmupHealthCheck
import io.lettuce.core.cluster.api.StatefulRedisClusterConnection
import kotlinx.coroutines.future.await
import kotlin.random.Random

/**
 * A Redis [WarmupHealthCheck] that uses a supplied Lettuce [StatefulRedisClusterConnection]
 * to execute commands.
 *
 * By default, the [eval] function will set elements with a 1 second TTL under random keys with
 * the prefix "cohort_warmup". Any chain of commands can be used by providing a custom [eval] function.
 */
@Deprecated("Use RedisClusterConnectionWarmup")
class RedisClusterWarmup(
   private val conn: StatefulRedisClusterConnection,
   override val iterations: Int,
   private val eval: suspend (StatefulRedisClusterConnection) -> Unit,
) : WarmupHealthCheck() {

   companion object {

      @Deprecated(
         "Provide a custom eval function or use the default", ReplaceWith(
            "RedisClusterWarmup(conn, iterations) { it.async().get(genkey()).await() }",
            "com.sksamuel.cohort.lettuce.RedisClusterWarmup",
            "kotlinx.coroutines.future.await"
         )
      )
      operator fun  invoke(
         iterations: Int,
         conn: StatefulRedisClusterConnection,
         genkey: () -> K
      ): RedisClusterWarmup {
         return RedisClusterWarmup(conn, iterations) { it.async().get(genkey()).await() }
      }

      operator fun invoke(
         iterations: Int,
         conn: StatefulRedisClusterConnection
      ): RedisClusterWarmup {
         return RedisClusterWarmup(conn, iterations) {
            val key = "cohort_warmup_" + Random.nextInt()
            it.async().incr(key).await()
            it.async().expire(key, 1).await()
            it.async().get(key).await()
         }
      }
   }

   override val name: String = "redis_warmup"

   override suspend fun warm(iteration: Int) {
      eval(conn)
   }
}